Randal Riedinger
RETRO ROBOT E
Dependents: RETRO_ROBOT_SC16IS750E
Fork of
SC16IS750
by 
Wim Huiskamp
Diff: SC16IS750.cpp
- Revision:
- 6:b57b71c0879a
- Parent:
- 5:ff3e57bebb6a
--- a/SC16IS750.cpp Wed Dec 24 01:05:49 2014 +0000
+++ b/SC16IS750.cpp Mon Mar 02 04:20:07 2015 +0000
@@ -1,4 +1,5 @@
-/* SC16IS750 I2C or SPI to UART bridge
+/*
+ * SC16IS750 I2C or SPI to UART bridge
* v0.1 WH, Nov 2013, Sparkfun WiFly Shield code library alpha 0 used as example, Added I2C I/F and many more methods.
* https://forum.sparkfun.com/viewtopic.php?f=13&t=21846
* v0.2 WH, Feb 2014, Added Doxygen Documentation, Added Hardware Reset pin methods.
@@ -20,1168 +21,1555 @@
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
-#include "mbed.h"
-#include "SC16IS750.h"
+
+#include "mbed.h"
+#include "SC16IS750.h"
#define ENABLE_BULK_TRANSFERS 1
#define BULK_BLOCK_LEN 16
-
-/** Abstract class SC16IS750 for converter between either SPI or I2C and a Serial port
- * Constructor for this Abstract Class is protected
- * Supports both SPI and I2C interfaces through derived classes
- *
- * @code
- *
- * @endcode
- */
-SC16IS750::SC16IS750() {
-//SC16IS750::SC16IS750() : Serial(NC, NC) { //Fout, mag geen NC zijn
-//SC16IS750::SC16IS750() : SerialBase(NC, NC) { //Fout, mag geen NC zijn
-// Dont call _init() here since the SPI or I2C port have not yet been configured...
- //_init(); // initialise UART registers
-}
-
-
-/** Set baudrate of the serial port.
- * @param baud integer baudrate (4800, 9600 etc)
- * @return none
- */
-void SC16IS750::baud(int baudrate) {
- unsigned long divisor = SC16IS750_BAUDRATE_DIVISOR(baudrate);
- char lcr_tmp;
+
+/*
+ * Abstract class SC16IS750 for converter between either SPI or I2C and a Serial port
+ * Constructor for this Abstract Class is protected
+ * Supports both SPI and I2C interfaces through derived classes
+ *
+ * @code
+ *
+ * @endcode
+ */
- _config.baudrate = baudrate; // Save baudrate
-
- lcr_tmp = this->readRegister(LCR); // Read current LCR register
- this->writeRegister(LCR, lcr_tmp | LCR_ENABLE_DIV); // Enable Divisor registers
- this->writeRegister(DLL, ( divisor & 0xFF)); // write divisor LSB
- this->writeRegister(DLH, ((divisor >> 8) & 0xFF)); // write divisor MSB
- this->writeRegister(LCR, lcr_tmp); // Restore LCR register, activate regular RBR, THR and IER registers
+SC16IS750::SC16IS750() {
+
+ // SC16IS750::SC16IS750() : Serial(NC, NC) { //Fout, mag geen NC zijn
+ // SC16IS750::SC16IS750() : SerialBase(NC, NC) { //Fout, mag geen NC zijn
+ // Dont call _init() here since the SPI or I2C port have not yet been configured...
+ // _init(); // initialize UART registers
}
-
+
+/*
+ * Set baudrate of the serial port.
+ * @param baud integer baudrate (4800, 9600 etc)
+ * @return none
+ */
-/** Set the transmission format used by the serial port.
- * @param bits The number of bits in a word (5-8; default = 8)
- * @param parity The parity used (Serial::None, Serial::Odd, Serial::Even, Serial::Forced1, Serial::Forced0; default = Serial::None)
- * @param stop_bits The number of stop bits (1 or 2; default = 1)
- * @return none
- */
-void SC16IS750::format(int bits, Serial::Parity parity, int stop_bits) {
- char lcr_tmp = 0x00;
-
- switch (bits) {
- case 5: lcr_tmp |= LCR_BITS5;
- break;
- case 6: lcr_tmp |= LCR_BITS6;
- break;
- case 7: lcr_tmp |= LCR_BITS7;
- break;
- case 8: lcr_tmp |= LCR_BITS8;
- break;
- default: lcr_tmp |= LCR_BITS8;
- }
+void SC16IS750::baud(unsigned long SC16IS750_XTAL_FREQ, int baudrate) {
+
+/*
+ #define SC16IS750_XTAL_FREQ 14745600UL // On-board crystal (New mid-2010 Version)
+ #define SC16IS750_XTAL_FREQ 12288000UL // On-board crystal (New mid-2010 Version)
+ #define SC16IS750_BAUDRATE_DIVISOR(baud) ((SC16IS750_XTAL_FREQ / SC16IS750_PRESCALER)/(baud * 16UL))
+*/
+
+ unsigned long divisor = (SC16IS750_XTAL_FREQ / SC16IS750_PRESCALER) / (baudrate * 16UL);
+
+ char lcr_tmp;
+
+ _config.baudrate = baudrate; // Save baudrate
+
+ lcr_tmp = this->readRegister(LCR); // Read current LCR register
+ this->writeRegister(LCR, lcr_tmp | LCR_ENABLE_DIV); // Enable Divisor registers
+ this->writeRegister(DLL, ( divisor & 0xFF)); // write divisor LSB
+ this->writeRegister(DLH, ((divisor >> 8) & 0xFF)); // write divisor MSB
+ this->writeRegister(LCR, lcr_tmp); // Restore LCR register, activate regular RBR, THR and IER registers
- switch (parity) {
- case Serial::None: lcr_tmp |= LCR_NONE;
- break;
- case Serial::Odd: lcr_tmp |= LCR_ODD;
- break;
- case Serial::Even: lcr_tmp |= LCR_EVEN;
- break;
- case Serial::Forced1: lcr_tmp |= LCR_FORCED1;
- break;
- case Serial::Forced0: lcr_tmp |= LCR_FORCED0;
- break;
- default: lcr_tmp |= LCR_NONE;
- }
-
- switch (stop_bits) {
- case 1: lcr_tmp |= LCR_BITS1;
- break;
- case 2: lcr_tmp |= LCR_BITS2;
- break;
- default: lcr_tmp |= LCR_BITS1;
- }
-
- _config.dataformat = lcr_tmp; // Save dataformat
-
- this->writeRegister(LCR, lcr_tmp); // Set LCR register, activate regular RBR, THR and IER registers
+}
+
+/*
+ * Set the transmission format used by the serial port.
+ * @param bits The number of bits in a word (5-8; default = 8)
+ * @param parity The parity used (Serial::None, Serial::Odd, Serial::Even, Serial::Forced1, Serial::Forced0; default = Serial::None)
+ * @param stop_bits The number of stop bits (1 or 2; default = 1)
+ * @return none
+ */
+
+void SC16IS750::format(int bits, Serial::Parity parity, int stop_bits) {
+
+ char lcr_tmp = 0x00;
+
+ switch (bits) {
+
+ case 5:
+ lcr_tmp |= LCR_BITS5;
+ break;
+
+ case 6:
+ lcr_tmp |= LCR_BITS6;
+ break;
+
+ case 7:
+ lcr_tmp |= LCR_BITS7;
+ break;
+
+ case 8:
+ lcr_tmp |= LCR_BITS8;
+ break;
+
+ default:
+ lcr_tmp |= LCR_BITS8;
+ break;
+
+ }
+
+ switch (parity) {
+
+ case Serial::None:
+ lcr_tmp |= LCR_NONE;
+ break;
+
+ case Serial::Odd:
+ lcr_tmp |= LCR_ODD;
+ break;
+
+ case Serial::Even:
+ lcr_tmp |= LCR_EVEN;
+ break;
+
+ case Serial::Forced1:
+ lcr_tmp |= LCR_FORCED1;
+ break;
+
+ case Serial::Forced0:
+ lcr_tmp |= LCR_FORCED0;
+ break;
+
+ default:
+ lcr_tmp |= LCR_NONE;
+ break;
+
+ }
+
+ switch (stop_bits) {
+
+ case 1:
+ lcr_tmp |= LCR_BITS1;
+ break;
+
+ case 2:
+ lcr_tmp |= LCR_BITS2;
+ break;
+
+ default:
+ lcr_tmp |= LCR_BITS1;
+ break;
+
+ }
+
+ _config.dataformat = lcr_tmp; // Save dataformat
+
+ this->writeRegister(LCR, lcr_tmp); // Set LCR register, activate regular RBR, THR and IER registers
};
-
-/** Generate a break condition on the serial line
- * @return none
- */
+
+/*
+ * Generate a break condition on the serial line
+ * @param none
+ * @return none
+ */
+
void SC16IS750::send_break() {
- // Wait for 1.5 frames before clearing the break condition
- // This will have different effects on our platforms, but should
- // ensure that we keep the break active for at least one frame.
- // We consider a full frame (1 start bit + 8 data bits bits +
- // 1 parity bit + 2 stop bits = 12 bits) for computation.
- // One bit time (in us) = 1000000/_baud
- // Twelve bits: 12000000/baud delay
- // 1.5 frames: 18000000/baud delay
- set_break(true);
- wait_us(18000000/_config.baudrate);
- set_break(false);
-};
+
+ // Wait for 1.5 frames before clearing the break condition
+ // This will have different effects on our platforms, but should
+ // ensure that we keep the break active for at least one frame.
+ // We consider a full frame (1 start bit + 8 data bits bits +
+ // 1 parity bit + 2 stop bits = 12 bits) for computation.
+ // One bit time (in us) = 1000000/_baud
+ // Twelve bits: 12000000 / baud delay
+ // 1.5 frames: 18000000 / baud delay
-/** Set a break condition on the serial line
- * @param enable break condition
- * @return none
- */
+ set_break(true);
+ wait_us(18000000 / _config.baudrate);
+ set_break(false);
+
+}
+
+/*
+ * Set a break condition on the serial line
+ * @param enable break condition
+ * @return none
+ */
+
void SC16IS750::set_break(bool enable) {
if (enable) {
- _config.dataformat |= LCR_BRK_ENA; // Save dataformat
- }
- else {
- _config.dataformat &= ~LCR_BRK_ENA; // Save dataformat
+
+ _config.dataformat |= LCR_BRK_ENA; // Save dataformat
+
+ } else {
+
+ _config.dataformat &= ~LCR_BRK_ENA; // Save dataformat
+
}
this->writeRegister(LCR, _config.dataformat); // Set LCR register
+
}
-
-/** Set the flow control type on the serial port
- * Added for compatibility with Serial Class.
- * SC16IS750 supports only Flow, Pins can not be selected.
- * This method sets hardware flow control. SC16IS750 supports XON/XOFF, but this is not implemented.
- *
- * @param type the flow control type (Disabled, RTS, CTS, RTSCTS)
- * @param flow1 the first flow control pin (RTS for RTS or RTSCTS, CTS for CTS) - NOT USED
- * @param flow2 the second flow control pin (CTS for RTSCTS) - NOT USED
- * @return none
- */
-void SC16IS750::set_flow_control(Flow type, PinName flow1, PinName flow2) {
- char lcr_tmp;
- char efr_tmp = 0x00;
-
- // We need to enable flow control to prevent overflow of buffers and
- // lose data when used with fast devices like the WiFly.
+
+/*
+ * Set the flow control type on the serial port
+ * Added for compatibility with Serial Class.
+ * SC16IS750 supports only Flow, Pins can not be selected.
+ * This method sets hardware flow control levels. SC16IS750 supports XON/XOFF, but this is not implemented.
+ *
+ * @param type the flow control type (Disabled, RTS, CTS, RTSCTS)
+ * @param flow1 the first flow control pin (RTS for RTS or RTSCTS, CTS for CTS)
+ * @param flow2 the second flow control pin (CTS for RTSCTS)
+ * @return none
+ */
- switch (type) {
- case Disabled :
- break;
- case RTS: efr_tmp = EFR_ENABLE_RTS;
- break;
- case CTS: efr_tmp = EFR_ENABLE_CTS;
- break;
- case RTSCTS: efr_tmp = EFR_ENABLE_RTS | EFR_ENABLE_CTS;
- break;
- default: ;
-
- }
-
- //Save flowcontrol mode and enable enhanced functions
- _config.flowctrl = efr_tmp | EFR_ENABLE_ENHANCED_FUNCTIONS;
-
- lcr_tmp = this->readRegister(LCR); // save LRC register
- this->writeRegister(LCR, LCR_ENABLE_ENHANCED_FUNCTIONS); // write magic number 0xBF to enable access to EFR register
- this->writeRegister(EFR, _config.flowctrl); // set flow and enable enhanced functions
- this->writeRegister(LCR, lcr_tmp); // restore LCR register
-}
+void SC16IS750::set_flow_control(Flow type, PinName flow1, PinName flow2) {
+
+ char lcr_tmp;
+ char efr_tmp = 0x00;
+
+ // We need to enable flow control to prevent overflow of buffers and
+ // lose data when used with fast devices like the WiFly.
+
+ switch (type) {
+
+ case Disabled:
+ break;
+
+ case RTS:
+ efr_tmp = EFR_ENABLE_RTS;
+ break;
+
+ case CTS:
+ efr_tmp = EFR_ENABLE_CTS;
+ break;
+
+ case RTSCTS:
+ efr_tmp = EFR_ENABLE_RTS | EFR_ENABLE_CTS;
+ break;
+
+ default:
+ break;
+
+ }
+
+ //Save flowcontrol mode and enable enhanced functions
+
+ _config.flowctrl = efr_tmp | EFR_ENABLE_ENHANCED_FUNCTIONS;
+
+ lcr_tmp = this->readRegister(LCR); // save LRC register
+ this->writeRegister(LCR, LCR_ENABLE_ENHANCED_FUNCTIONS); // write magic number 0xBF to enable access to EFR register
+ this->writeRegister(EFR, _config.flowctrl); // set flow and enable enhanced functions
+ this->writeRegister(LCR, lcr_tmp); // restore LCR register
-/** Set the RX FIFO flow control levels
- * This method sets hardware flow control levels. SC16IS750 supports XON/XOFF, but this is not implemented.
- * Should be called BEFORE Auto RTS is enabled.
- *
- * @param resume trigger level to resume transmission (0..15, meaning 0-60 with a granularity of 4)
- * @param halt trigger level to resume transmission (0..15, meaning 0-60 with granularity of 4)
- * @return none
- */
+}
+
+/*
+ * Set the RX FIFO flow control levels
+ * This method sets hardware flow control levels. SC16IS750 supports XON/XOFF, but this is not implemented.
+ * Should be called BEFORE Auto RTS is enabled.
+ *
+ * @param resume trigger level to resume transmission (0..15, meaning 0-60 with a granularity of 4)
+ * @param halt trigger level to resume transmission (0..15, meaning 0-60 with granularity of 4)
+ * @return none
+ */
+
void SC16IS750::set_flow_triggers(int resume, int halt) {
-
- // sanity checks
- halt = halt & 0x0F;
- resume = resume & 0x0F;
- if (halt <= resume) {
- halt = TCR_HALT_DEFAULT;
- resume = TCR_RESUME_DEFAULT;
- }
-
- // Note: TCR accessible only when EFR[4]=1 and MCR[2]=1
- this->writeRegister(TCR, (resume << 4) | halt); // set TCR register
+
+ // sanity checks
+
+ halt = halt & 0x0F;
+ resume = resume & 0x0F;
+
+ if (halt <= resume) {
+
+ halt = TCR_HALT_DEFAULT;
+ resume = TCR_RESUME_DEFAULT;
+
+ }
+
+ // Note: TCR accessible only when EFR[4] = 1 and MCR[2] = 1
+
+ this->writeRegister(TCR, (resume << 4) | halt); // set TCR register
+
}
+
+/*
+ * Set the Modem Control register
+ * This method sets prescaler, enables TCR and TLR
+ *
+ * @param none
+ * @return none
+ */
-
-/** Set the Modem Control register
- * This method sets prescaler, enables TCR and TLR
- *
- * @param none
- * @return none
- */
void SC16IS750::set_modem_control() {
+
+ // Note MCR[7:4] and MCR[2] only accessible when EFR[4] is set
+
+ if (SC16IS750_PRESCALER == SC16IS750_PRESCALER_1) { // Default prescaler after reset
+
+ this->writeRegister(MCR, MCR_PRESCALE_1 | MCR_ENABLE_TCR_TLR);
+
+ } else {
+
+ this->writeRegister(MCR, MCR_PRESCALE_4 | MCR_ENABLE_TCR_TLR);
+
+ }
- //Note MCR[7:4] and MCR[2] only accessible when EFR[4] is set
- if (SC16IS750_PRESCALER == SC16IS750_PRESCALER_1) { // Default prescaler after reset
- this->writeRegister(MCR, MCR_PRESCALE_1 | MCR_ENABLE_TCR_TLR);
- }
- else {
- this->writeRegister(MCR, MCR_PRESCALE_4 | MCR_ENABLE_TCR_TLR);
- }
}
-
-
-
-/** Initialise internal registers
+
+/** Initialize internal registers
* Should be in protection section. Public for testing purposes
* If initialisation fails this method does not return.
* @param none
* @return none
*/
-void SC16IS750::_init() {
-
- // Initialise SC16IS750
-
- // Hardware reset, assuming there is a HW Reset pin
-// this->hwReset();
-
- // Software reset, assuming there is no access to the HW Reset pin
- swReset();
- // Set default baudrate (depends on prescaler) and save in _config
- // DLL/DLH
- baud();
+void SC16IS750::_init() {
+
+ // Initialize SC16IS750
+
+ // Hardware reset, assuming there is a HW Reset pin this->hwReset();
+
+ // Software reset, assuming there is no access to the HW Reset pin
+
+ swReset();
+
+ // Set default baudrate (depends on prescaler) and save in _config DLL / DLH
+
+ baud();
+
+ // Set default dataformat and save in _config LCR
+
+ format();
+
+ // Set dataflow mode and Enables enhanced functions. Save in _config EFR
+
+ set_flow_control();
+
+ // FIFO control, sets TX and RX IRQ trigger levels and enables FIFO and save in _config
+ // Note FCR[5:4] only accessible when EFR[4] is set (enhanced functions enable) FCR, TLR
+
+ set_fifo_control();
+
+ flush();
+
+ // Modem control, sets prescaler, enable TCR and TLR
+ // Note MCR[7:4] and MCR[2] only accessible when EFR[4] is set (enhanced functions enable)
+
+ set_modem_control();
+
+ // Set RTS trigger levels
+ // Note TCR only accessible when EFR[4] is set (enhanced functions enable) and MCR[2] is set
+
+ set_flow_triggers();
+
+ // Set default break condition and save in _config LCR
+
+ // set_break();
+
+ // The UART bridge should now be successfully initialized.
+
+ // Test if UART bridge is present and initialized
+
+ if (!connected()) {
+
+ #if (0)
+
+ // Lock up if we fail to initialize UART bridge.
+
+ while(1){};
+
+ #else
+
+ // printf("Failed to initialize UART bridge\r\n");
+
+ #endif
+
+ } else {
+
+ // printf("Initialized UART bridge!\r\n");
+
+ }
+
+}
+
+/*
+ * FIFO control, sets TX and RX IRQ trigger levels and enables FIFO and save in _config
+ * Note FCR[5:4] (=TX_IRQ_LVL) only accessible when EFR[4] is set (enhanced functions enable)
+ * Note TLR only accessible when EFR[4] is set (enhanced functions enable) and MCR[2] is set
+ * @param none
+ * @return none
+ */
+
+void SC16IS750::set_fifo_control() {
+
+ // Set default fifoformat FCR
+
+ _config.fifoenable = true;
+
+ // Note FCR[5:4] (=TX_IRQ_LVL) only accessible when EFR[4] is set (enhanced functions enable)
+ // _config.fifoformat = FCR_RX_IRQ_8 | FCR_TX_IRQ_56;
+
+ _config.fifoformat = FCR_RX_IRQ_8 | FCR_TX_IRQ_8; // Default
+
+ if (_config.fifoenable) {
+
+ // Enable FIFO mode and set FIFO control values
+
+ this->writeRegister(FCR, _config.fifoformat | FCR_ENABLE_FIFO);
+
+ } else {
+
+ // Disable FIFO mode and set FIFO control values
+
+ this->writeRegister(FCR, _config.fifoformat);
+
+ }
+
+ // Set Trigger level register TLR for RX and TX interrupt generation
+ // Note TLR only accessible when EFR[4] is set (enhanced functions enable) and MCR[2] is set
+ // TRL Trigger levels for RX and TX are 0..15, meaning 0-60 with a granularity of 4 chars
+ // When TLR for RX or TX are 'Zero' the corresponding values in FCR are used. The FCR settings
+ // have less resolution (only 4 levels) so TLR is considered an enhanced function.
+
+ this->writeRegister(TLR, 0x00); // Use FCR Levels
+
+ // this->writeRegister(TLR, (TLR_RX_DEFAULT << 4) | TLR_TX_DEFAULT); // Use Default enhanced levels
+
+}
+
+/*
+ * Flush the UART FIFOs while maintaining current FIFO mode.
+ * @param none
+ * @return none
+ */
- // Set default dataformat and save in _config
- // LCR
- format();
+void SC16IS750::flush() {
+
+ // FCR is Write Only, use saved _config
+
+ // Reset TXFIFO, reset RXFIFO, non FIFO mode
+
+ this->writeRegister(FCR, FCR_TX_FIFO_RST | FCR_RX_FIFO_RST);
+
+ if (_config.fifoenable) {
+
+ // Enable FIFO mode and set FIFO control values
+
+ this->writeRegister(FCR, _config.fifoformat | FCR_ENABLE_FIFO);
+
+ } else {
+
+ // Disable FIFO mode and set FIFO control values
+
+ this->writeRegister(FCR, _config.fifoformat);
+
+ }
+
+ #if (0)
+
+ // original
+
+ /*
+ * Flush characters from SC16IS750 receive buffer.
+ */
+
+ // Note: This may not be the most appropriate flush approach.
+ // It might be better to just flush the UART's buffer
+ // rather than the buffer of the connected device
+ // which is essentially what this does.
+
+ while(readable() > 0) {
+
+ getc();
+
+ }
+
+ #endif
+
+}
+
+/*
+ *
+ * Check that UART is connected and operational.
+ * @param none
+ * @return bool true when connected, false otherwise
+ */
+
+bool SC16IS750::connected() {
+
+ // Perform read/write test to check if UART is working
+
+ const char TEST_CHARACTER = 'H';
+
+ this->writeRegister(SPR, TEST_CHARACTER);
+
+ return (this->readRegister(SPR) == TEST_CHARACTER);
- // Set dataflow mode and Enables enhanced functions
- // Save in _config
- // EFR
- set_flow_control();
+}
+
+/*
+ * Determine if there is a character available to read.
+ * This is data that's already arrived and stored in the receive
+ * buffer (which holds 64 chars).
+ *
+ * @return 1 if there is a character available to read, 0 otherwise
+ */
+
+int SC16IS750::readable() {
+ // if (this->readableCount() > 0) { // Check count
+
+ if (this->readRegister(LSR) & LSR_DR) { // Data in Receiver Bit, at least one character waiting
+
+ return 1;
+
+ } else {
+
+ return 0;
+
+ }
+
+}
+
+/*
+ * Determine how many characters are available to read.
+ * This is data that's already arrived and stored in the receive
+ * buffer (which holds 64 chars).
+ *
+ * @return int Characters available to read
+ */
+
+int SC16IS750::readableCount() {
+
+ return (this->readRegister(RXLVL));
+
+}
+
+/*
+ * Determine if there is space available to write a character.
+ * @return 1 if there is a space for a character to write, 0 otherwise
+ */
+
+int SC16IS750::writable() {
+
+ // if ((this->writableCount() > 0) { // Check count
+
+ if (this->readRegister(LSR) & LSR_THRE) { // THR Empty, space for at least one character
+
+ return 1;
+
+ } else {
+
+ return 0;
+
+ }
+
+}
+
+/*
+ * Determine how much space available for writing characters.
+ * This considers data that's already stored in the transmit
+ * buffer (which holds 64 chars).
+ *
+ * @return int character space available to write
+ */
+
+int SC16IS750::writableCount() {
+
+ return (this->readRegister(TXLVL)); // TX Level
+
+}
+
+/*
+ * Read char from UART Bridge.
+ * Acts in the same manner as 'Serial.read()'.
+ * @param none
+ * @return char read or -1 if no data available.
+ */
+
+int SC16IS750::getc() {
- // FIFO control, sets TX and RX IRQ trigger levels and enables FIFO and save in _config
- // Note FCR[5:4] only accessible when EFR[4] is set (enhanced functions enable)
- // FCR, TLR
- set_fifo_control();
- flush();
+ if (!readable()) {
+
+ return -1;
+
+ } else {
+
+ return this->readRegister(RHR);
+
+ }
+
+}
+
+/*
+ *
+ * Write char to UART Bridge. Blocking when no free space in FIFO
+ * @param value char to be written
+ * @return value written
+ */
+
+int SC16IS750::putc(int value) {
+
+ while (this->readRegister(TXLVL) == 0) {
+
+ // Wait for space in TX buffer
+
+ wait_us(10);
+
+ }
+
+ this->writeRegister(THR, value);
+
+ return value;
- // Modem control, sets prescaler, enable TCR and TLR
- // Note MCR[7:4] and MCR[2] only accessible when EFR[4] is set (enhanced functions enable)
- set_modem_control();
-
- // Set RTS trigger levels
- // Note TCR only accessible when EFR[4] is set (enhanced functions enable) and MCR[2] is set
- set_flow_triggers();
-
+}
+
+/*
+ *
+ * Write char string to UART Bridge. Blocking when no free space in FIFO
+ * @param *str char string to be written
+ * @return none
+ */
+
+void SC16IS750::writeString(const char *str) {
+
+ #if ENABLE_BULK_TRANSFERS
+
+ int len, idx;
+
+ len = strlen(str);
+
+ // Write blocks of BULK_BLOCK_LEN
+
+ while (len > BULK_BLOCK_LEN) {
+
+ while(this->readRegister(TXLVL) < BULK_BLOCK_LEN) {
+
+ // Wait for space in TX buffer
+
+ wait_us(10);
+
+ }
+
+ // Write a block of BULK_BLOCK_LEN bytes
+
+ #if (0)
+
+ // Note: can be optimized by writing registeraddress once and then repeatedly write the bytes.
+
+ for (idx = 0; idx < BULK_BLOCK_LEN; idx++) {
+
+ this->writeRegister(THR, str[idx]);
+
+ }
+
+ #else
+
+ // Optimized
+
+ this->writeDataBlock(str, BULK_BLOCK_LEN);
+
+ #endif
+
+ len -= BULK_BLOCK_LEN;
+ str += BULK_BLOCK_LEN;
+
+ }
+
+ // Write remaining bytes
+ // Note: can be optimized by writing registeraddress once and then repeatedly write the bytes.
+
+ for (idx = 0; idx < len; idx++) {
+
+ while (this->readRegister(TXLVL) == 0) {
+
+ // Wait for space in TX buffer
+
+ wait_us(10);
+
+ }
+
+ this->writeRegister(THR, str[idx]);
+
+ }
+
+ #else
+
+ // Single writes instead of bulktransfer
+
+ int len, idx;
+
+ len = strlen(str);
+
+ for (idx = 0; idx < len; idx++) {
+
+ while (this->readRegister(TXLVL) == 0) {
+
+ // Wait for space in TX buffer
+
+ wait_us(10);
+
+ }
+
+ this->writeRegister(THR, str[idx]);
+
+ }
+
+ #endif
- // Set default break condition and save in _config
- // LCR
- //set_break();
-
- // The UART bridge should now be successfully initialised.
+}
+
+/*
+ *
+ * Write byte array to UART Bridge. Blocking when no free space in FIFO
+ * @param *data byte array to be written
+ * @param len number of bytes to write
+ * @return none
+ */
+
+void SC16IS750::writeBytes(const char *data, int len) {
+
+ #if ENABLE_BULK_TRANSFERS
+
+ int idx;
+
+ // Write blocks of BULK_BLOCK_LEN
+
+ while (len > BULK_BLOCK_LEN) {
+
+ while(this->readRegister(TXLVL) < BULK_BLOCK_LEN) {
+
+ // Wait for space in TX buffer
+
+ wait_us(10);
+
+ }
+
+ // Write a block of BULK_BLOCK_LEN bytes
+
+ #if (0)
+
+ // Note: can be optimized by writing registeraddress once and then repeatedly write the bytes.
+
+ for (idx = 0; idx < BULK_BLOCK_LEN; idx++) {
+
+ this->writeRegister(THR, data[idx]);
+
+ }
+
+ #else
+
+ // Optimized
+
+ this->writeDataBlock(data, BULK_BLOCK_LEN);
+
+ #endif
+
+ len -= BULK_BLOCK_LEN;
+ data += BULK_BLOCK_LEN;
+
+ }
+
+ // Write remaining bytes
+ // Note: can be optimized by writing registeraddress once and then repeatedly write the bytes.
+
+ for (idx = 0; idx < len; idx++) {
+
+ while (this->readRegister(TXLVL) == 0) {
+
+ // Wait for space in TX buffer
+
+ wait_us(10);
+
+ }
+
+ this->writeRegister(THR, data[idx]);
+
+ }
+
+ #else
+
+ // Single writes instead of bulktransfer
+
+ int idx;
+
+ for (idx = 0; idx < len; idx++) {
+
+ while (this->readRegister(TXLVL) == 0) {
+
+ // Wait for space in TX buffer
+
+ wait_us(10);
+
+ }
+
+ this->writeRegister(THR, str[idx]);
+
+ }
+
+ #endif
- // Test if UART bridge is present and initialised
- if(!connected()){
-#if(0)
- // Lock up if we fail to initialise UART bridge.
- while(1) {};
-#else
- printf("Failed to initialise UART bridge\r\n");
-#endif
- }
- else {
- printf("Initialised UART bridge!\r\n");
- }
+}
+
+/*
+ * Set direction of I/O port pins.
+ * This method is specific to the SPI-I2C UART and not found on the 16750
+ * Note: The SC16IS752 does not have separate GPIOs for Channel_A and Channel_B.
+ * @param bits Bitpattern for I/O (1=output, 0=input)
+ * @return none
+ */
+
+void SC16IS750::ioSetDirection(unsigned char bits) {
+
+ this->writeRegister(IODIR, bits);
+
+}
+
+/*
+ * Set bits of I/O port pins.
+ * This method is specific to the SPI-I2C UART and not found on the 16750
+ * Note: The SC16IS752 does not have separate GPIOs for Channel_A and Channel_B.
+ * @param bits Bitpattern for I/O (1= set output bit, 0 = clear output bit)
+ * @return none
+ */
+
+void SC16IS750::ioSetState(unsigned char bits) {
+
+ this->writeRegister(IOSTATE, bits);
+
+}
+
+/*
+ * Get bits of I/O port pins.
+ * This method is specific to the SPI-I2C UART and not found on the 16750
+ * Note: The SC16IS752 does not have separate GPIOs for Channel_A and Channel_B.
+ * @param none
+ * @return bits Bitpattern for I/O (1= bit set, 0 = bit cleared)
+ */
+unsigned char SC16IS750::ioGetState() {
+
+ return this->readRegister(IOSTATE) ;
+
+}
+
+/*
+ * Software Reset SC16IS750 device.
+ * This method is specific to the SPI-I2C UART and not found on the 16750
+ * Note: The SC16IS752 does not have separate Reset for Channel_A and Channel_B.
+ * @param none
+ * @return none
+ */
+
+void SC16IS750::swReset() {
+
+ this->writeRegister(IOCTRL, IOC_SW_RST);
+
}
-
-/** FIFO control, sets TX and RX trigger levels and enables FIFO and save in _config
- * Note FCR[5:4] (=TX_IRQ_LVL) only accessible when EFR[4] is set (enhanced functions enable)
- * Note TLR only accessible when EFR[4] is set (enhanced functions enable) and MCR[2] is set
- * @param none
- * @return none
- */
-void SC16IS750::set_fifo_control() {
-
- // Set default fifoformat
- // FCR
- _config.fifoenable = true;
-
- // Note FCR[5:4] (=TX_IRQ_LVL) only accessible when EFR[4] is set (enhanced functions enable)
-// _config.fifoformat = FCR_RX_IRQ_8 | FCR_TX_IRQ_56;
- _config.fifoformat = FCR_RX_IRQ_8 | FCR_TX_IRQ_8; //Default
-
- if (_config.fifoenable)
- // enable FIFO mode and set FIFO control values
- this->writeRegister(FCR, _config.fifoformat | FCR_ENABLE_FIFO);
- else
- // disable FIFO mode and set FIFO control values
- this->writeRegister(FCR, _config.fifoformat);
-
- // Set Trigger level register TLR for RX and TX interrupt generation
- // Note TLR only accessible when EFR[4] is set (enhanced functions enable) and MCR[2] is set
- // TRL Trigger levels for RX and TX are 0..15, meaning 0-60 with a granularity of 4 chars
- // When TLR for RX or TX are 'Zero' the corresponding values in FCR are used. The FCR settings
- // have less resolution (only 4 levels) so TLR is considered an enhanced function.
- this->writeRegister(TLR, 0x00); // Use FCR Levels
-// this->writeRegister(TLR, (TLR_RX_DEFAULT << 4) | TLR_TX_DEFAULT); // Use Default enhanced levels
-
-}
+//
+// End Abstract Class Implementation
+//
+
+//
+// Begin SPI Class Implementation
+//
-
-/**
- * Flush the UART FIFOs while maintaining current FIFO mode.
- * @param none
- * @return none
- */
-void SC16IS750::flush() {
- // FCR is Write Only, use saved _config
-
- // reset TXFIFO, reset RXFIFO, non FIFO mode
- this->writeRegister(FCR, FCR_TX_FIFO_RST | FCR_RX_FIFO_RST);
+/*
+ * Create an SC16IS750_SPI object using a specified SPI bus and CS
+ *
+ * @param SPI &spi the SPI port to connect to
+ * @param cs Pinname of the CS pin (active low)
+ * @param rst Pinname for Reset pin (active low) Optional, Default = NC
+ */
- if (_config.fifoenable)
- // enable FIFO mode and set FIFO control values
- this->writeRegister(FCR, _config.fifoformat | FCR_ENABLE_FIFO);
- else
- // disable FIFO mode and set FIFO control values
- this->writeRegister(FCR, _config.fifoformat);
+SC16IS750_SPI::SC16IS750_SPI(SPI *spi, PinName cs, PinName rst) : _spi(spi), _cs(cs) {
+
+ _cs = 1; // Deselect
+
+ _spi->format(8, 0);
+
+ _spi->frequency(1000000);
+
+ //_spi->frequency(100000);
+
+ // The hardware Reset pin is optional. Test and make sure whether it exists or not to prevent illegal access.
+
+ if (rst != NC) {
+
+ _reset = new DigitalOut(rst); // Construct new pin
+ _reset->write(1); // Deactivate
+
+ } else {
+
+ // No Hardware Reset pin
+
+ _reset = NULL; // Construct dummy pin
+
+ }
+
+
+ // Dont call _init() until SPI port has been configured.
+ // That is why _init() is not called in parent Constructor
+
+ _init();
+
+}
+
+/*
+ * Destruct SC16IS750_SPI bridge object
+ *
+ * @param none
+ * @return none
+ */
-#if(0)
-//original
- /*
- * Flush characters from SC16IS750 receive buffer.
- */
-
- // Note: This may not be the most appropriate flush approach.
- // It might be better to just flush the UART's buffer
- // rather than the buffer of the connected device
- // which is essentially what this does.
- while(readable() > 0) {
- getc();
- }
-#endif
+SC16IS750_SPI::~SC16IS750_SPI() {
+
+ if (_reset != NULL) {
+
+ delete _reset;
+
+ } // Reset pin
}
-/**
- * Check that UART is connected and operational.
- * @param none
- * @return bool true when connected, false otherwise
- */
-bool SC16IS750::connected() {
- // Perform read/write test to check if UART is working
- const char TEST_CHARACTER = 'H';
-
- this->writeRegister(SPR, TEST_CHARACTER);
-
- return (this->readRegister(SPR) == TEST_CHARACTER);
-}
-
-
-/** Determine if there is a character available to read.
- * This is data that's already arrived and stored in the receive
- * buffer (which holds 64 chars).
- *
- * @return 1 if there is a character available to read, 0 otherwise
- */
-int SC16IS750::readable() {
+/*
+ * Write value to internal register.
+ * @param registerAddress The address of the Register (enum RegisterName)
+ * @param data The 8bit value to write
+ * @return none
+ */
-// if (this->readableCount() > 0) { // Check count
- if (this->readRegister(LSR) & LSR_DR) { // Data in Receiver Bit, at least one character waiting
- return 1;
- }
- else {
- return 0;
- }
-}
-
-/** Determine how many characters are available to read.
- * This is data that's already arrived and stored in the receive
- * buffer (which holds 64 chars).
- *
- * @return int Characters available to read
- */
-int SC16IS750::readableCount() {
-
- return (this->readRegister(RXLVL));
-}
-
-/** Determine if there is space available to write a character.
- * @return 1 if there is a space for a character to write, 0 otherwise
- */
-int SC16IS750::writable() {
-
-// if ((this->writableCount() > 0) { // Check count
- if (this->readRegister(LSR) & LSR_THRE) { // THR Empty, space for at least one character
- return 1;
- }
- else {
- return 0;
- }
-}
-
-/** Determine how much space available for writing characters.
- * This considers data that's already stored in the transmit
- * buffer (which holds 64 chars).
- *
- * @return int character space available to write
- */
-int SC16IS750::writableCount() {
-
- return (this->readRegister(TXLVL)); // TX Level
-}
-
-
-/**
- * Read char from UART Bridge.
- * Acts in the same manner as 'Serial.read()'.
- * @param none
- * @return char read or -1 if no data available.
- */
-int SC16IS750::getc() {
-
- if (!readable()) {
- return -1;
- }
-
- return this->readRegister(RHR);
-}
-
-
-/**
- * Write char to UART Bridge. Blocking when no free space in FIFO
- * @param value char to be written
- * @return value written
- */
-int SC16IS750::putc(int value) {
-
- while (this->readRegister(TXLVL) == 0) {
- // Wait for space in TX buffer
- wait_us(10);
- };
- this->writeRegister(THR, value);
-
- return value;
-}
-
-
-/**
- * Write char string to UART Bridge. Blocking when no free space in FIFO
- * @param *str char string to be written
- * @return none
- */
-void SC16IS750::writeString(const char *str) {
-
-#if ENABLE_BULK_TRANSFERS
- int len, idx;
-
- len = strlen(str);
-
- // Write blocks of BULK_BLOCK_LEN
- while (len > BULK_BLOCK_LEN) {
- while(this->readRegister(TXLVL) < BULK_BLOCK_LEN) {
- // Wait for space in TX buffer
- wait_us(10);
- };
-
- // Write a block of BULK_BLOCK_LEN bytes
-#if (0)
- // Note: can be optimized by writing registeraddress once and then repeatedly write the bytes.
- for (idx=0; idx<BULK_BLOCK_LEN; idx++) {
- this->writeRegister(THR, str[idx]);
- };
-#else
- // optimized
- this->writeDataBlock(str, BULK_BLOCK_LEN);
-#endif
-
- len -= BULK_BLOCK_LEN;
- str += BULK_BLOCK_LEN;
- }
-
- // Write remaining bytes
- // Note: can be optimized by writing registeraddress once and then repeatedly write the bytes.
- for (idx=0; idx<len; idx++) {
- while (this->readRegister(TXLVL) == 0) {
- // Wait for space in TX buffer
- wait_us(10);
- };
- this->writeRegister(THR, str[idx]);
- }
-
-
-#else
- // Single writes instead of bulktransfer
- int len, idx;
-
- len = strlen(str);
- for (idx=0; idx<len; idx++) {
- while (this->readRegister(TXLVL) == 0) {
- // Wait for space in TX buffer
- wait_us(10);
- };
- this->writeRegister(THR, str[idx]);
- }
-#endif
-}
-
+void SC16IS750_SPI::writeRegister(RegisterName registerAddress, char data) {
+
+ _cs = 0; // Select;
+ _spi->write(registerAddress);
+ _spi->write(data);
+ _cs = 1; // Deselect;
-/**
- * Write byte array to UART Bridge. Blocking when no free space in FIFO
- * @param *data byte array to be written
- * @param len number of bytes to write
- * @return none
- */
-void SC16IS750::writeBytes(const char *data, int len) {
-
-#if ENABLE_BULK_TRANSFERS
- int idx;
-
- // Write blocks of BULK_BLOCK_LEN
- while (len > BULK_BLOCK_LEN) {
- while(this->readRegister(TXLVL) < BULK_BLOCK_LEN) {
- // Wait for space in TX buffer
- wait_us(10);
- };
-
- // Write a block of BULK_BLOCK_LEN bytes
-#if (0)
- // Note: can be optimized by writing registeraddress once and then repeatedly write the bytes.
- for (idx=0; idx<BULK_BLOCK_LEN; idx++) {
- this->writeRegister(THR, data[idx]);
- };
-#else
- // optimized
- this->writeDataBlock(data, BULK_BLOCK_LEN);
-#endif
-
- len -= BULK_BLOCK_LEN;
- data += BULK_BLOCK_LEN;
- }
-
- // Write remaining bytes
- // Note: can be optimized by writing registeraddress once and then repeatedly write the bytes.
- for (idx=0; idx<len; idx++) {
- while (this->readRegister(TXLVL) == 0) {
- // Wait for space in TX buffer
- wait_us(10);
- };
- this->writeRegister(THR, data[idx]);
- }
-
-
-#else
- // Single writes instead of bulktransfer
- int idx;
+}
+
+/*
+ * Read value from internal register.
+ * @param registerAddress The address of the Register (enum RegisterName)
+ * @return char The 8bit value read from the register
+ */
- for (idx=0; idx<len; idx++) {
- while (this->readRegister(TXLVL) == 0) {
- // Wait for space in TX buffer
- wait_us(10);
- };
- this->writeRegister(THR, str[idx]);
- }
-#endif
-}
-
-
-/** Set direction of I/O port pins.
- * This method is specific to the SPI-I2C UART and not found on the 16750
- * Note: The SC16IS752 does not have separate GPIOs for Channel_A and Channel_B.
- * @param bits Bitpattern for I/O (1=output, 0=input)
- * @return none
- */
-void SC16IS750::ioSetDirection(unsigned char bits) {
- this->writeRegister(IODIR, bits);
-}
-
-/** Set bits of I/O port pins.
- * This method is specific to the SPI-I2C UART and not found on the 16750
- * Note: The SC16IS752 does not have separate GPIOs for Channel_A and Channel_B.
- * @param bits Bitpattern for I/O (1= set output bit, 0 = clear output bit)
- * @return none
- */
-void SC16IS750::ioSetState(unsigned char bits) {
- this->writeRegister(IOSTATE, bits);
-}
-
-/** Get bits of I/O port pins.
- * This method is specific to the SPI-I2C UART and not found on the 16750
- * Note: The SC16IS752 does not have separate GPIOs for Channel_A and Channel_B.
- * @param none
- * @return bits Bitpattern for I/O (1= bit set, 0 = bit cleared)
- */
-unsigned char SC16IS750::ioGetState() {
- return this->readRegister(IOSTATE) ;
-}
-
-
-/** Software Reset SC16IS750 device.
- * This method is specific to the SPI-I2C UART and not found on the 16750
- * Note: The SC16IS752 does not have separate Reset for Channel_A and Channel_B.
- * @param none
- * @return none
- */
-void SC16IS750::swReset() {
- this->writeRegister(IOCTRL, IOC_SW_RST);
-}
-
-
-//
-// End Abstract Class Implementation
-//
-
-
-
-//
-// Begin SPI Class Implementation
-//
-
-
-/** Create an SC16IS750_SPI object using a specified SPI bus and CS
- *
- * @param SPI &spi the SPI port to connect to
- * @param cs Pinname of the CS pin (active low)
- * @param rst Pinname for Reset pin (active low) Optional, Default = NC
- */
-SC16IS750_SPI::SC16IS750_SPI (SPI *spi, PinName cs, PinName rst) : _spi(spi), _cs(cs) {
- _cs = 1; // deselect
-
- _spi->format(8, 0);
- _spi->frequency(1000000);
-
- // The hardware Reset pin is optional. Test and make sure whether it exists or not to prevent illegal access.
- if (rst != NC) {
- _reset = new DigitalOut(rst); //Construct new pin
- _reset->write(1); //Deactivate
- }
- else {
- // No Hardware Reset pin
- _reset = NULL; //Construct dummy pin
- }
-
-
- // Dont call _init() until SPI port has been configured.
- // That is why _init() is not called in parent Constructor
- _init();
-
-};
-
-
-/** Destruct SC16IS750_SPI bridge object
- *
- * @param none
- * @return none
- */
-SC16IS750_SPI::~SC16IS750_SPI() {
- if (_reset != NULL) {delete _reset;} // Reset pin
-}
-
-/** Write value to internal register.
- * Pure virtual, must be declared in derived class.
- * @param registerAddress The address of the Register (enum RegisterName)
- * @param data The 8bit value to write
- * @return none
- */
-void SC16IS750_SPI::writeRegister(RegisterName registerAddress, char data) {
-
- _cs = 0; // select;
- _spi->write(registerAddress);
- _spi->write(data);
- _cs = 1; // deselect;
+char SC16IS750_SPI::readRegister(RegisterName registerAddress) {
+
+ // Used in SPI read operations to flush slave's shift register
+
+ const char SPI_DUMMY_CHAR = 0xFF;
+
+ char result;
+
+ _cs = 0; // Select;
+ _spi->write(SPI_READ_MODE_FLAG | registerAddress);
+ result = _spi->write(SPI_DUMMY_CHAR);
+ _cs = 1; // Deselect;
+
+ return result;
}
-
-
-/** Read value from internal register.
- * @param registerAddress The address of the Register (enum RegisterName)
- * @return char The 8bit value read from the register
- */
-char SC16IS750_SPI::readRegister(RegisterName registerAddress) {
-
- // Used in SPI read operations to flush slave's shift register
- const char SPI_DUMMY_CHAR = 0xFF;
-
- char result;
-
- _cs = 0; // select;
- _spi->write(SPI_READ_MODE_FLAG | registerAddress);
- result = _spi->write(SPI_DUMMY_CHAR);
- _cs = 1; // deselect;
-
- return result;
-}
-
-
-/** Write multiple datavalues to Transmitregister.
- * More Efficient implementation than writing individual bytes
- * Assume that previous check confirmed that the FIFO has sufficient free space to store the data
- * Pure virtual, must be declared in derived class.
- * @param char* databytes The pointer to the block of data
- * @param len The number of bytes to write
- * @return none
- */
+
+/*
+ * Write multiple datavalues to Transmitregister.
+ * More Efficient implementation than writing individual bytes
+ * Assume that previous check confirmed that the FIFO has sufficient free space to store the data
+ *
+ * @param char* databytes The pointer to the block of data
+ * @param len The number of bytes to write
+ * @return none
+ */
+
void SC16IS750_SPI::writeDataBlock (const char *data, int len) {
- int i;
-
- _cs = 0; // select;
-
- // Select the Transmit Holding Register
- // Assume that previous check confirmed that the FIFO has sufficient free space to store the data
- _spi->write(THR);
-
- for (i=0; i<len; i++, data++)
- _spi->write(*data);
+
+ int i;
+
+ _cs = 0; // select;
+
+ // Select the Transmit Holding Register
+ // Assume that previous check confirmed that the FIFO has sufficient free space to store the data
- _cs = 1; // deselect;
-}
-
+ _spi->write(THR);
+
+ for (i = 0; i < len; i++, data++) {
+
+ _spi->write(*data);
+
+ }
+
+ _cs = 1; // deselect;
-/** Hardware Reset SC16IS750 device.
- * This method is only available when the Reset pin has been declared and is also connected
- * @param none
- * @return none
- */
-void SC16IS750_SPI::hwReset() {
+}
+
+/*
+ * Hardware Reset SC16IS750 device.
+ * This method is only functional when the Reset pin has been declared and is also connected
+ * @param none
+ * @return none
+ */
- if (_reset != NULL){
- _reset->write(0); //activate
-// wait_ms(100);
- wait_ms(1000); //test only
- _reset->write(1); //deactivate
- }
- else {
- printf("Hardware Reset pin is not available...\n\r");
- }
+void SC16IS750_SPI::hwReset() {
+
+ if (_reset != NULL) {
+
+ _reset->write(0); // Activate
+
+ // wait_ms(100);
+
+ wait_ms(1000); //Test only
+
+ _reset->write(1); // Deactivate
+
+ } else {
+
+ printf("Hardware Reset pin is not available...\n\r");
+
+ }
}
//
// End SPI Implementation
//
-
-
-
+
//
// Begin I2C Implementation
//
-/** Create a SC16IS750_I2C object for a bridge between I2C and a Serial port
- *
- * @param I2C &i2c the I2C port to connect to
- * @param char deviceAddress the I2C slave address of the SC16IS750
- * @param rst Pinname for Reset pin (active low) Optional, Default = NC
- *
- */
+/*
+ * Create a SC16IS750_I2C object for a bridge between I2C and a Serial port
+ *
+ * @param I2C &i2c the I2C port to connect to
+ * @param char deviceAddress the I2C slave address of the SC16IS750
+ * @param rst Pinname for Reset pin (active low) Optional, Default = NC
+ *
+ */
+
SC16IS750_I2C::SC16IS750_I2C(I2C *i2c, uint8_t deviceAddress, PinName rst) : _i2c(i2c), _slaveAddress(deviceAddress & 0xFE) {
+
+ //_i2c->frequency(400000);
+
+ _i2c->frequency(400000);
+
+ // The hardware Reset pin is optional. Test and make sure whether it exists or not to prevent illegal access.
+
+ if (rst != NC) {
+
+ _reset = new DigitalOut(rst); // Construct new pin
+ _reset->write(1); // Deactivate
+
+ } else {
+
+ // No Hardware Reset pin
+
+ _reset = NULL; // Construct dummy pin
+
+ }
+
+ // Dont call _init() until I2C port has been configured.
+ // That is why _init() is not called in parent Constructor
+
+ _init();
-// _i2c->frequency(400000);
- _i2c->frequency(100000);
-
- // The hardware Reset pin is optional. Test and make sure whether it exists or not to prevent illegal access.
- if (rst != NC) {
- _reset = new DigitalOut(rst); //Construct new pin
- _reset->write(1); //Deactivate
- }
- else {
- // No Hardware Reset pin
- _reset = NULL; //Construct dummy pin
- }
-
- // Dont call _init() until I2C port has been configured.
- // That is why _init() is not called in parent Constructor
- _init();
}
-
+
+/*
+ * Destruct SC16IS750_I2C bridge object
+ *
+ * @param none
+ * @return none
+ */
-/** Destruct SC16IS750_I2C bridge object
- *
- * @param none
- * @return none
- */
SC16IS750_I2C::~SC16IS750_I2C() {
- if (_reset != NULL) {delete _reset;} // Reset pin
+
+ if (_reset != NULL) {
+
+ delete _reset; // Reset pin
+
+ }
+
}
-
-
-/** Write value to internal register.
- * @param registerAddress The address of the Register (enum RegisterName)
- * @param data The 8bit value to write
- * @return none
- */
+
+/*
+ * Write value to internal register.
+ * @param registerAddress The address of the Register (enum RegisterName)
+ * @param data The 8bit value to write
+ * @return none
+ */
+
void SC16IS750_I2C::writeRegister(RegisterName registerAddress, char data) {
- char w[2];
+
+ char w[2];
+
+ w[0] = registerAddress;
+ w[1] = data;
+
+ _i2c->write(_slaveAddress, w, 2);
- w[0] = registerAddress;
- w[1] = data;
-
- _i2c->write( _slaveAddress, w, 2 );
}
-
-
-/** Read value from internal register.
- * @param registerAddress The address of the Register (enum RegisterName)
- * @return char The 8bit value read from the register
- */
+
+/*
+ * Read value from internal register.
+ * @param registerAddress The address of the Register (enum RegisterName)
+ * @return char The 8bit value read from the register
+ */
+
char SC16IS750_I2C::readRegister(RegisterName registerAddress) {
- /*
- * Read char from SC16IS750 register at <registerAddress>.
- */
- char w[1];
- char r[1];
+
+ /*
+ * Read char from SC16IS750 register at <registerAddress>.
+ */
- w[0] = registerAddress;
+ char w[1];
+ char r[1];
+
+ w[0] = registerAddress;
-// _i2c->write( _slaveAddress, w, 1 );
- _i2c->write(_slaveAddress, w, 1, true); //Repeated Start
- _i2c->read( _slaveAddress, r, 1 );
-
- return ( r[0] );
-}
-
+ // _i2c->write(_slaveAddress, w, 1 );
+
+ _i2c->write(_slaveAddress, w, 1, true); // Repeated Start
+ _i2c->read(_slaveAddress, r, 1);
+
+ return (r[0]);
-/** Write multiple datavalues to Transmitregister.
- * More Efficient implementation than writing individual bytes
- * Assume that previous check confirmed that the FIFO has sufficient free space to store the data
- * Pure virtual, must be declared in derived class.
- * @param char* databytes The pointer to the block of data
- * @param len The number of bytes to write
- * @return none
- */
-void SC16IS750_I2C::writeDataBlock (const char *data, int len) {
-
-#if(0)
- int i;
- char w[BULK_BLOCK_LEN];
-
- // Select the Transmit Holding Register
- // Assume that previous check confirmed that the FIFO has sufficient free space to store the data
- w[0] = THR;
-
- // copy the data..
- for (i=0; i<len; i++)
- w[i+1] = data[i];
-
- _i2c->write( _slaveAddress, w, len + 1);
-#else
- int i;
+}
+
+/*
+ * Write multiple datavalues to Transmitregister.
+ * More Efficient implementation than writing individual bytes
+ * Assume that previous check confirmed that the FIFO has sufficient free space to store the data
+ * Pure virtual, must be declared in derived class.
+ * @param char* databytes The pointer to the block of data
+ * @param len The number of bytes to write
+ * @return none
+ */
- _i2c->start();
- _i2c->write(_slaveAddress);
-
- // Select the Transmit Holding Register
- // Assume that previous check confirmed that the FIFO has sufficient free space to store the data
- _i2c->write(THR);
-
- // send the data..
- for (i=0; i<len; i++)
- _i2c->write(data[i]);
+void SC16IS750_I2C::writeDataBlock (const char *data, int len) {
- _i2c->stop();
-#endif
-}
-
+ #if (0)
+
+ int i;
+ char w[BULK_BLOCK_LEN];
+
+ // Select the Transmit Holding Register
+ // Assume that previous check confirmed that the FIFO has sufficient free space to store the data
+
+ w[0] = THR;
+
+ // Copy the data ...
+
+ for (i=0; i<len; i++)
+ w[i+1] = data[i];
+
+ _i2c->write(_slaveAddress, w, len + 1);
+
+ #else
+
+ int i;
+
+ _i2c->start();
+ _i2c->write(_slaveAddress);
+
+ // Select the Transmit Holding Register
+ // Assume that previous check confirmed that the FIFO has sufficient free space to store the data
+
+ _i2c->write(THR);
+
+ // Send the data ..
+
+ for (i = 0; i < len; i++) {
+
+ _i2c->write(data[i]);
+
+ }
+
+ _i2c->stop();
+
+ #endif
-/** Hardware Reset SC16IS750 device.
- * This method is only available when the Reset pin has been declared and is also connected
- * @param none
- * @return none
- */
-void SC16IS750_I2C::hwReset() {
+}
+
+/*
+ * Hardware Reset SC16IS750 device.
+ * This method is only available when the Reset pin has been declared and is also connected
+ * @param none
+ * @return none
+ */
- if (_reset != NULL){
- _reset->write(0); //activate
-// wait_ms(100);
- wait_ms(1000); //test only
- _reset->write(1); //deactivate
- }
- else {
- printf("Hardware Reset pin is not available...\n\r");
- }
+void SC16IS750_I2C::hwReset() {
+
+ if (_reset != NULL) {
+
+ _reset->write(0); // Activate
+
+ // wait_ms(100);
+
+ wait_ms(1000); // Test only
+
+ _reset->write(1); // Deactivate
+
+
+ } else {
+
+ printf("Hardware Reset pin is not available ...\n\r");
+
+ }
+
}
-
//
// End I2C Implementation
//
-
-
-
+
//
// Begin SPI Class Implementation for 16SCIS752 dual UART
//
-
-/** Create an SC16IS752_SPI object using a specified SPI bus and CS
- * Note: The SC16IS752 does not have separate GPIOs for Channel_A and Channel_B.
- * Note: The SC16IS752 does not have separate Reset for Channel_A and Channel_B.
- *
- * @param SPI &spi the SPI port to connect to
- * @param cs Pinname of the CS pin (active low)
- * @param rst Pinname for Reset pin (active low) Optional, Default = NC
- * @param channel UART ChannelName, Default = Channel_A
- */
-SC16IS752_SPI::SC16IS752_SPI (SPI *spi, PinName cs, PinName rst, ChannelName channel) : _spi(spi), _cs(cs), _channel(channel) {
- _cs = 1; // deselect
+/*
+ * Create an SC16IS752_SPI object using a specified SPI bus and CS
+ * Note: The SC16IS752 does not have separate GPIOs for Channel_A and Channel_B.
+ * Note: The SC16IS752 does not have separate Reset for Channel_A and Channel_B.
+ *
+ * @param SPI &spi the SPI port to connect to
+ * @param cs Pinname of the CS pin (active low)
+ * @param rst Pinname for Reset pin (active low) Optional, Default = NC
+ * @param channel UART ChannelName, Default = Channel_A
+ */
- _spi->format(8, 0);
- _spi->frequency(1000000);
-
- // The hardware Reset pin is optional. Test and make sure whether it exists or not to prevent illegal access.
- if (rst != NC) {
- _reset = new DigitalOut(rst); //Construct new pin
- _reset->write(1); //Deactivate
- }
- else {
- // No Hardware Reset pin
- _reset = NULL; //Construct dummy pin
- }
-
+SC16IS752_SPI::SC16IS752_SPI (SPI *spi, PinName cs, PinName rst, ChannelName channel) : _spi(spi), _cs(cs), _channel(channel) {
+
+ _cs = 1; // Deselect
+
+ _spi->format(8, 0);
+ _spi->frequency(1000000);
+
+ // The hardware Reset pin is optional. Test and make sure whether it exists or not to prevent illegal access.
+
+ if (rst != NC) {
+
+ _reset = new DigitalOut(rst); // Construct new pin
+ _reset->write(1); // Deactivate
+
+ }
+ else {
+
+ // No Hardware Reset pin
+ _reset = NULL; // Construct dummy pin
+
+ }
+
+ // Dont call _init() until SPI port has been configured.
+ // That is why _init() is not called in parent Constructor
+
+ _init();
- // Dont call _init() until SPI port has been configured.
- // That is why _init() is not called in parent Constructor
- _init();
-
-};
-
-
-/** Destruct SC16IS750_SPI bridge object
- *
- * @param none
- * @return none
- */
-SC16IS752_SPI::~SC16IS752_SPI() {
- if (_reset != NULL) {delete _reset;} // Reset pin
}
-
+
+/*
+ * Destruct SC16IS750_SPI bridge object
+ *
+ * @param none
+ * @return none
+ */
-/** Write value to internal register.
- * Pure virtual, must be declared in derived class.
- * @param registerAddress The address of the Register (enum RegisterName)
- * @param data The 8bit value to write
- * @return none
- */
+SC16IS752_SPI::~SC16IS752_SPI() {
+
+ if (_reset != NULL) {
+
+ delete _reset; // Reset pin
+
+ }
+
+}
+
+/*
+ * Write value to internal register.
+ * Pure virtual, must be declared in derived class.
+ * @param registerAddress The address of the Register (enum RegisterName)
+ * @param data The 8bit value to write
+ * @return none
+ */
+
void SC16IS752_SPI::writeRegister(RegisterName registerAddress, char data) {
-
- _cs = 0; // select;
- _spi->write(registerAddress | _channel);
- _spi->write(data);
- _cs = 1; // deselect;
+
+ _cs = 0; // Select;
+ _spi->write(registerAddress | _channel);
+ _spi->write(data);
+ _cs = 1; // Deselect;
}
-
-
-/** Read value from internal register.
- * @param registerAddress The address of the Register (enum RegisterName)
- * @return char The 8bit value read from the register
- */
+
+/*
+ * Read value from internal register.
+ * @param registerAddress The address of the Register (enum RegisterName)
+ * @return char The 8bit value read from the register
+ */
+
char SC16IS752_SPI::readRegister(RegisterName registerAddress) {
-
- // Used in SPI read operations to flush slave's shift register
- const char SPI_DUMMY_CHAR = 0xFF;
-
- char result;
+
+ // Used in SPI read operations to flush slave's shift register
+
+ const char SPI_DUMMY_CHAR = 0xFF;
+
+ char result;
+
+ _cs = 0; // Select;
+ _spi->write(SPI_READ_MODE_FLAG | registerAddress | _channel);
+ result = _spi->write(SPI_DUMMY_CHAR);
+ _cs = 1; // Deselect;
+
+ return result;
- _cs = 0; // select;
- _spi->write(SPI_READ_MODE_FLAG | registerAddress | _channel);
- result = _spi->write(SPI_DUMMY_CHAR);
- _cs = 1; // deselect;
-
- return result;
}
-
-
-/** Write multiple datavalues to Transmitregister.
- * More Efficient implementation than writing individual bytes
- * Assume that previous check confirmed that the FIFO has sufficient free space to store the data
- * Pure virtual, must be declared in derived class.
- * @param char* databytes The pointer to the block of data
- * @param len The number of bytes to write
- * @return none
- */
+
+/*
+ * Write multiple datavalues to Transmitregister.
+ * More Efficient implementation than writing individual bytes
+ * Assume that previous check confirmed that the FIFO has sufficient free space to store the data
+ * Pure virtual, must be declared in derived class.
+ * @param char* databytes The pointer to the block of data
+ * @param len The number of bytes to write
+ * @return none
+ */
+
void SC16IS752_SPI::writeDataBlock (const char *data, int len) {
- int i;
-
- _cs = 0; // select;
-
- // Select the Transmit Holding Register
- // Assume that previous check confirmed that the FIFO has sufficient free space to store the data
- _spi->write(THR | _channel);
-
- for (i=0; i<len; i++, data++)
- _spi->write(*data);
+
+ int i;
+
+ _cs = 0; // Select;
+
+ // Select the Transmit Holding Register
+ // Assume that previous check confirmed that the FIFO has sufficient free space to store the data
- _cs = 1; // deselect;
-}
-
+ _spi->write(THR | _channel);
+
+ for (i = 0; i < len; i++, data++) {
+
+ _spi->write(*data);
+
+ }
+
+ _cs = 1; // Deselect;
-/** Hardware Reset SC16IS752 device.
- * This method is only available when the Reset pin has been declared and is also connected
- * @param none
- * @return none
- */
-void SC16IS752_SPI::hwReset() {
+}
+
+/*
+ * Hardware Reset SC16IS752 device.
+ * This method is only available when the Reset pin has been declared and is also connected
+ * @param none
+ * @return none
+ */
- if (_reset != NULL){
- _reset->write(0); //activate
-// wait_ms(100);
- wait_ms(1000); //test only
- _reset->write(1); //deactivate
- }
- else {
- printf("Hardware Reset pin is not available...\n\r");
- }
+void SC16IS752_SPI::hwReset() {
+
+ if (_reset != NULL) {
+
+ _reset->write(0); // Activate
+
+ // wait_ms(100);
+
+ wait_ms(1000); // Test only
+
+ _reset->write(1); // Deactivate
+
+ } else {
+
+ printf("Hardware Reset pin is not available ...\n\r");
+
+ }
}
//
// End SPI Implementation
//
-
-
-
+
//
// Begin I2C Implementation for 16SCIS752 dual UART
//
-/** Create a SC16IS752_I2C object for a bridge between I2C and a Serial port
- * Note: The SC16IS752 does not have separate GPIOs for Channel_A and Channel_B.
- * Note: The SC16IS752 does not have separate Reset for Channel_A and Channel_B.
- *
- * @param I2C &i2c the I2C port to connect to
- * @param char deviceAddress the I2C slave address of the SC16IS750
- * @param rst Pinname for Reset pin (active low) Optional, Default = NC
- * @param channel UART Channel, Default = Channel_A
- */
-SC16IS752_I2C::SC16IS752_I2C(I2C *i2c, uint8_t deviceAddress, PinName rst, ChannelName channel) : _i2c(i2c), _slaveAddress(deviceAddress & 0xFE), _channel(channel) {
-
-// _i2c->frequency(400000);
- _i2c->frequency(100000);
-
- // The hardware Reset pin is optional. Test and make sure whether it exists or not to prevent illegal access.
- if (rst != NC) {
- _reset = new DigitalOut(rst); //Construct new pin
- _reset->write(1); //Deactivate
- }
- else {
- // No Hardware Reset pin
- _reset = NULL; //Construct dummy pin
- }
+/*
+ * Create a SC16IS752_I2C object for a bridge between I2C and a Serial port
+ * Note: The SC16IS752 does not have separate GPIOs for Channel_A and Channel_B.
+ * Note: The SC16IS752 does not have separate Reset for Channel_A and Channel_B.
+ *
+ * @param I2C &i2c the I2C port to connect to
+ * @param char deviceAddress the I2C slave address of the SC16IS750
+ * @param rst Pinname for Reset pin (active low) Optional, Default = NC
+ * @param channel UART Channel, Default = Channel_A
+ */
- // Dont call _init() until I2C port has been configured.
- // That is why _init() is not called in parent Constructor
- _init();
-}
-
+SC16IS752_I2C::SC16IS752_I2C(I2C *i2c, uint8_t deviceAddress, PinName rst, ChannelName channel) :
+ _i2c(i2c), _slaveAddress(deviceAddress & 0xFE), _channel(channel) {
+
+ // _i2c->frequency(400000);
+
+ _i2c->frequency(100000);
+
+ // The hardware Reset pin is optional. Test and make sure whether it exists or not to prevent illegal access.
+
+ if (rst != NC) {
+
+ _reset = new DigitalOut(rst); // Construct new pin
+ _reset->write(1); // Deactivate
+
+ } else {
+
+ // No Hardware Reset pin
+
+ _reset = NULL; // Construct dummy pin
+
+ }
+
+ // Dont call _init() until I2C port has been configured.
+ // That is why _init() is not called in parent Constructor
+
+ _init();
-/** Destruct SC16IS752_I2C bridge object
- *
- * @param none
- * @return none
- */
-SC16IS752_I2C::~SC16IS752_I2C() {
- if (_reset != NULL) {delete _reset;} // Reset pin
-}
-
-
-/** Write value to internal register.
- * @param registerAddress The address of the Register (enum RegisterName)
- * @param data The 8bit value to write
- * @return none
- */
-void SC16IS752_I2C::writeRegister(RegisterName registerAddress, char data) {
- char w[2];
-
- w[0] = registerAddress | _channel;
- w[1] = data;
-
- _i2c->write( _slaveAddress, w, 2 );
}
+/*
+ * Destruct SC16IS752_I2C bridge object
+ *
+ * @param none
+ * @return none
+ */
-/** Read value from internal register.
- * @param registerAddress The address of the Register (enum RegisterName)
- * @return char The 8bit value read from the register
- */
-char SC16IS752_I2C::readRegister(RegisterName registerAddress) {
- /*
- * Read char from SC16IS752 register at <registerAddress>.
- */
- char w[1];
- char r[1];
+SC16IS752_I2C::~SC16IS752_I2C() {
- w[0] = registerAddress | _channel;
-
-// _i2c->write( _slaveAddress, w, 1 );
- _i2c->write(_slaveAddress, w, 1, true); //Repeated Start
- _i2c->read(_slaveAddress, r, 1 );
-
- return ( r[0] );
+ if (_reset != NULL) {delete _reset;} // Reset pin
+
}
-
-
-/** Write multiple datavalues to Transmitregister.
- * More Efficient implementation than writing individual bytes
- * Assume that previous check confirmed that the FIFO has sufficient free space to store the data
- * Pure virtual, must be declared in derived class.
- * @param char* databytes The pointer to the block of data
- * @param len The number of bytes to write
- * @return none
- */
-void SC16IS752_I2C::writeDataBlock (const char *data, int len) {
+
+/*
+ * Write value to internal register.
+ * @param registerAddress The address of the Register (enum RegisterName)
+ * @param data The 8bit value to write
+ * @return none
+ */
-#if(0)
- int i;
- char w[BULK_BLOCK_LEN];
+void SC16IS752_I2C::writeRegister(RegisterName registerAddress, char data) {
+
+ char w[2];
+
+ w[0] = registerAddress | _channel;
+ w[1] = data;
+
+ _i2c->write( _slaveAddress, w, 2 );
+
+}
+
+/*
+ * Read value from internal register.
+ * @param registerAddress The address of the Register (enum RegisterName)
+ * @return char The 8bit value read from the register
+ */
- // Select the Transmit Holding Register
- // Assume that previous check confirmed that the FIFO has sufficient free space to store the data
- w[0] = THR | _channel;
+char SC16IS752_I2C::readRegister(RegisterName registerAddress) {
+
+ /*
+ * Read char from SC16IS752 register at <registerAddress>.
+ */
+
+ char w[1];
+ char r[1];
+
+ w[0] = registerAddress | _channel;
+
+ // _i2c->write( _slaveAddress, w, 1);
+ _i2c->write(_slaveAddress, w, 1, true); // Repeated Start
+ _i2c->read(_slaveAddress, r, 1);
+
+ return (r[0]);
- // copy the data..
- for (i=0; i<len; i++)
- w[i+1] = data[i];
-
- _i2c->write( _slaveAddress, w, len + 1);
-#else
- int i;
+}
+
+/*
+ * Write multiple datavalues to Transmitregister.
+ * More Efficient implementation than writing individual bytes
+ * Assume that previous check confirmed that the FIFO has sufficient free space to store the data
+ * Pure virtual, must be declared in derived class.
+ * @param char* databytes The pointer to the block of data
+ * @param len The number of bytes to write
+ * @return none
+ */
- _i2c->start();
- _i2c->write(_slaveAddress);
-
- // Select the Transmit Holding Register
- // Assume that previous check confirmed that the FIFO has sufficient free space to store the data
- _i2c->write(THR | _channel);
-
- // send the data..
- for (i=0; i<len; i++)
- _i2c->write(data[i]);
+void SC16IS752_I2C::writeDataBlock (const char *data, int len) {
- _i2c->stop();
-#endif
-}
-
+ #if (0)
+
+ int i;
+ char w[BULK_BLOCK_LEN];
+
+ // Select the Transmit Holding Register
+ // Assume that previous check confirmed that the FIFO has sufficient free space to store the data
+
+ w[0] = THR | _channel;
+
+ // Copy the data ...
+
+ for (i = 0; i < len; i++) {
+
+ w[i+1] = data[i];
+
+ }
+
+ _i2c->write(_slaveAddress, w, len + 1);
+
+ #else
+
+ int i;
+
+ _i2c->start();
+ _i2c->write(_slaveAddress);
+
+ // Select the Transmit Holding Register
+ // Assume that previous check confirmed that the FIFO has sufficient free space to store the data
+
+ _i2c->write(THR | _channel);
+
+ // Send the data ...
+
+ for (i = 0; i < len; i++) {
+
+ _i2c->write(data[i]);
+
+ }
+
+ _i2c->stop();
+
+ #endif
-/** Hardware Reset SC16IS752 device.
- * This method is only available when the Reset pin has been declared and is also connected
- * @param none
- * @return none
- */
+}
+
+/*
+ * Hardware Reset SC16IS752 device.
+ * This method is only available when the Reset pin has been declared and is also connected
+ * @param none
+ * @return none
+ */
+
void SC16IS752_I2C::hwReset() {
-
- if (_reset != NULL){
- _reset->write(0); //activate
-// wait_ms(100);
- wait_ms(1000); //test only
- _reset->write(1); //deactivate
- }
- else {
- printf("Hardware Reset pin is not available...\n\r");
- }
+
+ if (_reset != NULL){
+
+ _reset->write(0); //activate
+
+ // wait_ms(100);
+
+ wait_ms(1000); //test only
+
+ _reset->write(1); //deactivate
+
+
+ } else {
+
+ printf("Hardware Reset pin is not available...\n\r");
+
+ }
+
}
-
//
// End I2C Implementation
//
-
-
-