marcus chiou
mbed library sources
Fork of
mbed-src
by 
mbed official
Diff: targets/hal/TARGET_Atmel/TARGET_SAM21/serial_api.c
- Revision:
- 592:a274ee790e56
- Parent:
- 579:53297373a894
--- a/targets/hal/TARGET_Atmel/TARGET_SAM21/serial_api.c Wed Jul 15 08:15:08 2015 +0100
+++ b/targets/hal/TARGET_Atmel/TARGET_SAM21/serial_api.c Fri Jul 17 09:15:10 2015 +0100
@@ -20,7 +20,12 @@
#include "pinmap.h"
#include "PeripheralPins.h"
#include "usart.h"
-#include "samr21_xplained_pro.h"
+#include "pinmap_function.h"
+
+#define USART_TX_INDEX 0
+#define USART_RX_INDEX 1
+#define USART_RXFLOW_INDEX 2
+#define USART_TXFLOW_INDEX 3
#if DEVICE_SERIAL_ASYNCH
#define pUSART_S(obj) obj->serial.usart
@@ -35,6 +40,13 @@
uint8_t serial_get_index(serial_t *obj);
IRQn_Type get_serial_irq_num (serial_t *obj);
+uint32_t get_serial_vector (serial_t *obj);
+void uart0_irq();
+void uart1_irq();
+void uart2_irq();
+void uart3_irq();
+void uart4_irq();
+void uart5_irq();
static uint32_t serial_irq_ids[USART_NUM] = {0};
static uart_irq_handler irq_handler;
@@ -90,9 +102,54 @@
_USART(obj).CTRLA.reg = SERCOM_USART_CTRLA_SWRST;
}
-static enum status_code usart_set_config_default( serial_t *obj)
+uint32_t serial_find_mux_settings (serial_t *obj)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
+ uint32_t mux_setting = 0;
+ uint32_t pinpad[4] = {0};
+ uint8_t i = 0;
+ uint32_t sercom_index = pinmap_merge_sercom(pSERIAL_S(obj)->pins[0], pSERIAL_S(obj)->pins[1]);
+ for (i = 0; i < 4 ; i++) {
+ pinpad[i] = pinmap_pad_sercom(pSERIAL_S(obj)->pins[i], sercom_index);
+ }
+
+ switch(pinpad[USART_RX_INDEX]) {
+ case 0:
+ mux_setting |= SERCOM_USART_CTRLA_RXPO(0);
+ break;
+ case 1:
+ mux_setting |= SERCOM_USART_CTRLA_RXPO(1);
+ break;
+ case 2:
+ mux_setting |= SERCOM_USART_CTRLA_RXPO(2);
+ break;
+ case 3:
+ mux_setting |= SERCOM_USART_CTRLA_RXPO(3);
+ break;
+ }
+
+ if ((pSERIAL_S(obj)->pins[USART_RXFLOW_INDEX] == NC) && (pSERIAL_S(obj)->pins[USART_TXFLOW_INDEX] == NC)) {
+ if (pinpad[USART_TX_INDEX] == 0) {
+ mux_setting |= SERCOM_USART_CTRLA_TXPO(0);
+ } else if(pinpad[USART_RX_INDEX] == 2) {
+ mux_setting |= SERCOM_USART_CTRLA_TXPO(1);
+ } else {
+ mux_setting = mux_setting; // dummy condition
+ }
+ } else { // for hardware flow control and uart // expecting the tx in pad 0, rts in pad2 and cts in pad 3
+ if((pinpad[USART_TX_INDEX] == 0) && (pinpad[USART_RXFLOW_INDEX]/*rts pin*/ == 2) && (pinpad[USART_TXFLOW_INDEX] /*cts pin*/ == 3)) {
+ mux_setting |= SERCOM_USART_CTRLA_TXPO(2);
+ }
+ }
+ return mux_setting;
+}
+
+static enum status_code usart_set_config_default(serial_t *obj)
+{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
/* Index for generic clock */
uint32_t sercom_index = _sercom_get_sercom_inst_index(pUSART_S(obj));
uint32_t gclk_index = sercom_index + SERCOM0_GCLK_ID_CORE;
@@ -155,85 +212,60 @@
void get_default_serial_values(serial_t *obj)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
/* Set default config to object */
pSERIAL_S(obj)->parity = USART_PARITY_NONE;
pSERIAL_S(obj)->stopbits = USART_STOPBITS_1;
pSERIAL_S(obj)->character_size = USART_CHARACTER_SIZE_8BIT;
pSERIAL_S(obj)->baudrate = 9600;
pSERIAL_S(obj)->mux_setting = USART_RX_1_TX_2_XCK_3;
- pSERIAL_S(obj)->pinmux_pad0 = PINMUX_DEFAULT;
- pSERIAL_S(obj)->pinmux_pad1 = PINMUX_DEFAULT;
- pSERIAL_S(obj)->pinmux_pad2 = PINMUX_DEFAULT;
- pSERIAL_S(obj)->pinmux_pad3 = PINMUX_DEFAULT;
};
void serial_init(serial_t *obj, PinName tx, PinName rx)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
if (g_sys_init == 0) {
system_init();
g_sys_init = 1;
}
-
struct system_gclk_chan_config gclk_chan_conf;
UARTName uart;
uint32_t gclk_index;
uint32_t pm_index;
uint32_t sercom_index = 0;
uint32_t muxsetting = 0;
- uint32_t padsetting[4] = {0};
/* Disable USART module */
disable_usart(obj);
get_default_serial_values(obj);
- find_pin_settings(tx, rx, NC, NC, &padsetting[0]); // tx, rx, clk(rts), chipsel(cts) pad array // getting pads from pins
- muxsetting = find_mux_setting(tx, rx, NC, NC); // getting mux setting from pins
- sercom_index = pinmap_sercom_peripheral(tx, rx); // same variable sercom_index reused for optimization
- switch (sercom_index) {
- case 0:
- uart = UART_0;
- pUSART_S(obj) = SERCOM0;
- break;
- case 1:
- uart = UART_1;
- pUSART_S(obj) = SERCOM1;
- break;
- case 2:
- uart = UART_2;
- pUSART_S(obj) = SERCOM2;
- break;
- case 3:
- uart = UART_3;
- pUSART_S(obj) = SERCOM3;
- break;
- case 4:
- uart = UART_4;
- pUSART_S(obj) = SERCOM4;
- break;
- case 5:
- uart = UART_5;
- pUSART_S(obj) = SERCOM5;
- break;
+ pSERIAL_S(obj)->pins[USART_TX_INDEX] = tx;
+ pSERIAL_S(obj)->pins[USART_RX_INDEX] = rx;
+ pSERIAL_S(obj)->pins[USART_RXFLOW_INDEX] = NC;
+ pSERIAL_S(obj)->pins[USART_TXFLOW_INDEX] = NC;
+
+ muxsetting = serial_find_mux_settings(obj); // getting mux setting from pins
+ sercom_index = pinmap_merge_sercom(tx, rx); // same variable sercom_index reused for optimization
+ if (sercom_index == (uint32_t)NC) {
+ /*expecting a valid value for sercom index*/
+ return;
}
-
- pSERIAL_S(obj)->txpin = tx;
- pSERIAL_S(obj)->rxpin = rx;
- pSERIAL_S(obj)->mux_setting = muxsetting;//EDBG_CDC_SERCOM_MUX_SETTING;
- pSERIAL_S(obj)->pinmux_pad0 = padsetting[0];//EDBG_CDC_SERCOM_PINMUX_PAD0;
- pSERIAL_S(obj)->pinmux_pad1 = padsetting[1];//EDBG_CDC_SERCOM_PINMUX_PAD1;
- pSERIAL_S(obj)->pinmux_pad2 = padsetting[2];//EDBG_CDC_SERCOM_PINMUX_PAD2;
- pSERIAL_S(obj)->pinmux_pad3 = padsetting[3];//EDBG_CDC_SERCOM_PINMUX_PAD3;
+ sercom_index &= 0x0F;
+ uart = pinmap_peripheral_sercom(NC, sercom_index);
+ pUSART_S(obj) = (Sercom *)uart;
pm_index = sercom_index + PM_APBCMASK_SERCOM0_Pos;
gclk_index = sercom_index + SERCOM0_GCLK_ID_CORE;
if (_USART(obj).CTRLA.reg & SERCOM_USART_CTRLA_SWRST) {
- /* The module is busy resetting itself */
+ return; /* The module is busy resetting itself */
}
if (_USART(obj).CTRLA.reg & SERCOM_USART_CTRLA_ENABLE) {
- /* Check the module is enabled */
+ return; /* Check the module is enabled */
}
/* Turn on module in PM */
@@ -245,29 +277,23 @@
system_gclk_chan_enable(gclk_index);
sercom_set_gclk_generator(GCLK_GENERATOR_0, false);
+ pSERIAL_S(obj)->mux_setting = muxsetting;
/* Set configuration according to the config struct */
usart_set_config_default(obj);
+
struct system_pinmux_config pin_conf;
- system_pinmux_get_config_defaults(&pin_conf);
pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_INPUT;
pin_conf.input_pull = SYSTEM_PINMUX_PIN_PULL_NONE;
-
- uint32_t pad_pinmuxes[] = {
- pSERIAL_S(obj)->pinmux_pad0, pSERIAL_S(obj)->pinmux_pad1,
- pSERIAL_S(obj)->pinmux_pad2, pSERIAL_S(obj)->pinmux_pad3
- };
+ pin_conf.powersave = false;
/* Configure the SERCOM pins according to the user configuration */
for (uint8_t pad = 0; pad < 4; pad++) {
- uint32_t current_pinmux = pad_pinmuxes[pad];
-
- if (current_pinmux == PINMUX_DEFAULT) {
- current_pinmux = _sercom_get_default_pad(pUSART_S(obj), pad);
- }
-
- if (current_pinmux != PINMUX_UNUSED) {
- pin_conf.mux_position = current_pinmux & 0xFFFF;
- system_pinmux_pin_set_config(current_pinmux >> 16, &pin_conf);
+ uint32_t current_pin = pSERIAL_S(obj)->pins[pad];
+ if (current_pin != (uint32_t)NC) {
+ pin_conf.mux_position = pinmap_function_sercom(current_pin, sercom_index);
+ if ((uint8_t)NC != pin_conf.mux_position) {
+ system_pinmux_pin_set_config(current_pin, &pin_conf);
+ }
}
}
@@ -275,23 +301,25 @@
stdio_uart_inited = 1;
memcpy(&stdio_uart, obj, sizeof(serial_t));
}
-
/* Wait until synchronization is complete */
usart_syncing(obj);
/* Enable USART module */
enable_usart(obj);
-
}
void serial_free(serial_t *obj)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
serial_irq_ids[serial_get_index(obj)] = 0;
disable_usart(obj);
}
void serial_baud(serial_t *obj, int baudrate)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
MBED_ASSERT((baudrate == 110) || (baudrate == 150) || (baudrate == 300) || (baudrate == 1200) ||
(baudrate == 2400) || (baudrate == 4800) || (baudrate == 9600) || (baudrate == 19200) || (baudrate == 38400) ||
(baudrate == 57600) || (baudrate == 115200) || (baudrate == 230400) || (baudrate == 460800) || (baudrate == 921600) );
@@ -330,6 +358,8 @@
void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
MBED_ASSERT((stop_bits == 1) || (stop_bits == 2));
MBED_ASSERT((parity == ParityNone) || (parity == ParityOdd) || (parity == ParityEven));
MBED_ASSERT((data_bits == 5) || (data_bits == 6) || (data_bits == 7) || (data_bits == 8) /*|| (data_bits == 9)*/);
@@ -418,117 +448,114 @@
}
#ifdef DEVICE_SERIAL_FC
-void uart0_irq();
-void uart1_irq();
-void uart2_irq();
-void uart3_irq();
-void uart4_irq();
-void uart5_irq();
void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, PinName txflow)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
uint32_t muxsetting = 0;
uint32_t sercom_index = 0;
- uint32_t padsetting[4] = {0};
-
IRQn_Type irq_n = (IRQn_Type)0;
uint32_t vector = 0;
- switch ((int)pUSART_S(obj)) {
- case UART_0:
- vector = (uint32_t)uart0_irq;
- break;
- case UART_1:
- vector = (uint32_t)uart1_irq;
- break;
- case UART_2:
- vector = (uint32_t)uart2_irq;
- break;
- case UART_3:
- vector = (uint32_t)uart3_irq;
- break;
- case UART_4:
- vector = (uint32_t)uart4_irq;
- break;
- case UART_5:
- vector = (uint32_t)uart5_irq;
- break;
+ pSERIAL_S(obj)->pins[USART_RXFLOW_INDEX] = rxflow;
+ pSERIAL_S(obj)->pins[USART_TXFLOW_INDEX] = txflow;
+ muxsetting = serial_find_mux_settings(obj); // getting mux setting from pins
+ sercom_index = pinmap_merge_sercom(pSERIAL_S(obj)->pins[USART_TX_INDEX], pSERIAL_S(obj)->pins[USART_RX_INDEX]); // same variable sercom_index reused for optimization
+ if (sercom_index == (uint32_t)NC) {
+ /*expecting a valid value for sercom index*/
+ return;
}
+
+ vector = get_serial_vector(obj);
irq_n = get_serial_irq_num(obj);
disable_usart(obj);
- //TODO : assert for rxflow and txflow pis to be added
- find_pin_settings(pSERIAL_S(obj)->txpin, pSERIAL_S(obj)->rxpin, rxflow, txflow, &padsetting[0]); // tx, rx, clk(rts), chipsel(cts) pad array // getting pads from pins
- muxsetting = find_mux_setting(pSERIAL_S(obj)->txpin, pSERIAL_S(obj)->rxpin, rxflow, txflow); // getting mux setting from pins
-
- pSERIAL_S(obj)->mux_setting = muxsetting;//EDBG_CDC_SERCOM_MUX_SETTING;
- pSERIAL_S(obj)->pinmux_pad0 = padsetting[0];//EDBG_CDC_SERCOM_PINMUX_PAD0;
- pSERIAL_S(obj)->pinmux_pad1 = padsetting[1];//EDBG_CDC_SERCOM_PINMUX_PAD1;
- pSERIAL_S(obj)->pinmux_pad2 = padsetting[2];//EDBG_CDC_SERCOM_PINMUX_PAD2;
- pSERIAL_S(obj)->pinmux_pad3 = padsetting[3];//EDBG_CDC_SERCOM_PINMUX_PAD3;
/* Set configuration according to the config struct */
+ pSERIAL_S(obj)->mux_setting = muxsetting; // mux setting to be changed for configuring hardware control
usart_set_config_default(obj);
struct system_pinmux_config pin_conf;
- system_pinmux_get_config_defaults(&pin_conf);
pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_INPUT;
pin_conf.input_pull = SYSTEM_PINMUX_PIN_PULL_NONE;
-
- uint32_t pad_pinmuxes[] = {
- pSERIAL_S(obj)->pinmux_pad0, pSERIAL_S(obj)->pinmux_pad1,
- pSERIAL_S(obj)->pinmux_pad2, pSERIAL_S(obj)->pinmux_pad3
- };
+ pin_conf.powersave = false;
- /* Configure the SERCOM pins according to the user configuration */
- for (uint8_t pad = 0; pad < 3; pad++) {
- uint32_t current_pinmux = pad_pinmuxes[pad];
-
- if (current_pinmux == PINMUX_DEFAULT) {
- current_pinmux = _sercom_get_default_pad(pUSART_S(obj), pad);
- }
-
- if (current_pinmux != PINMUX_UNUSED) {
- pin_conf.mux_position = current_pinmux & 0xFFFF;
- system_pinmux_pin_set_config(current_pinmux >> 16, &pin_conf);
+ for (uint8_t pad = 0; pad < 2; pad++) { // setting for rx and tx
+ uint32_t current_pin = pSERIAL_S(obj)->pins[pad];
+ if (current_pin != (uint32_t)NC) {
+ pin_conf.mux_position = pinmap_function_sercom(current_pin, sercom_index);
+ if ((uint8_t)NC != pin_conf.mux_position) {
+ system_pinmux_pin_set_config(current_pin, &pin_conf);
+ }
}
}
- if (pSERIAL_S(obj)->pinmux_pad3 != PINMUX_UNUSED) {
- pin_conf.input_pull = SYSTEM_PINMUX_PIN_PULL_UP;
- pin_conf.mux_position = pSERIAL_S(obj)->pinmux_pad3 & 0xFFFF;
- system_pinmux_pin_set_config(pSERIAL_S(obj)->pinmux_pad3 >> 16, &pin_conf);
+ if((FlowControlRTS == type) || (FlowControlRTSCTS== type)) {
+ if (pSERIAL_S(obj)->pins[USART_RXFLOW_INDEX] != NC) {
+ pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_OUTPUT; // setting for rxflow
+ pin_conf.input_pull = SYSTEM_PINMUX_PIN_PULL_UP;
+ pin_conf.mux_position = pinmap_function_sercom(pSERIAL_S(obj)->pins[USART_RXFLOW_INDEX] , sercom_index);
+ if ((uint8_t)NC != pin_conf.mux_position) {
+ system_pinmux_pin_set_config(pSERIAL_S(obj)->pins[USART_RXFLOW_INDEX], &pin_conf);
+ }
+ }
}
+ if((FlowControlCTS == type) || (FlowControlRTSCTS== type)) {
+ if (pSERIAL_S(obj)->pins[USART_TXFLOW_INDEX] != NC) {
+ pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_INPUT; // setting for txflow
+ pin_conf.input_pull = SYSTEM_PINMUX_PIN_PULL_UP;
+ pin_conf.mux_position = pinmap_function_sercom(pSERIAL_S(obj)->pins[USART_TXFLOW_INDEX] , sercom_index);
+ if ((uint8_t)NC != pin_conf.mux_position) {
+ system_pinmux_pin_set_config(pSERIAL_S(obj)->pins[USART_TXFLOW_INDEX], &pin_conf);
+ }
+ }
+ }
+ enable_usart(obj);
+}
- NVIC_SetVector(irq_n, vector);
- NVIC_EnableIRQ(irq_n);
-
- enable_usart(obj);
- _USART(obj).INTENSET.reg = SERCOM_USART_INTENCLR_CTSIC;
-}
+#endif //DEVICE_SERIAL_FC
void serial_break_set(serial_t *obj)
{
- disable_usart(obj);
- _USART(obj).CTRLB.reg &= ~SERCOM_SPI_CTRLB_RXEN;
- usart_syncing(obj);
- enable_usart(obj);
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
+ struct system_pinmux_config pin_conf;
+ pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_OUTPUT;
+ pin_conf.input_pull = SYSTEM_PINMUX_PIN_PULL_NONE;
+ pin_conf.mux_position = SYSTEM_PINMUX_GPIO;
+ pin_conf.powersave = false;
+
+ if (pSERIAL_S(obj)->pins[USART_TX_INDEX] != NC) {
+ system_pinmux_pin_set_config(pSERIAL_S(obj)->pins[USART_TX_INDEX], &pin_conf);
+ }
}
void serial_break_clear(serial_t *obj)
{
- disable_usart(obj);
- _USART(obj).CTRLB.reg |= SERCOM_SPI_CTRLB_RXEN;
- usart_syncing(obj);
- enable_usart(obj);
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
+ uint32_t sercom_index = pinmap_merge_sercom(pSERIAL_S(obj)->pins[USART_TX_INDEX], pSERIAL_S(obj)->pins[USART_RX_INDEX]);
+
+ struct system_pinmux_config pin_conf;
+ pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_INPUT;
+ pin_conf.input_pull = SYSTEM_PINMUX_PIN_PULL_NONE;
+ pin_conf.powersave = false;
+
+ if (pSERIAL_S(obj)->pins[USART_TX_INDEX] != NC) {
+ pin_conf.mux_position = pinmap_function_sercom(pSERIAL_S(obj)->pins[USART_TX_INDEX], sercom_index);
+ if ((uint8_t)NC != pin_conf.mux_position) {
+ system_pinmux_pin_set_config(pSERIAL_S(obj)->pins[USART_TX_INDEX], &pin_conf);
+ }
+ }
}
-#endif //DEVICE_SERIAL_FC
-
/******************************************************************************
* INTERRUPTS HANDLING
******************************************************************************/
inline uint8_t serial_get_index(serial_t *obj)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
switch ((int)pUSART_S(obj)) {
case UART_0:
return 0;
@@ -545,8 +572,10 @@
}
return 0;
}
+
static inline void uart_irq(SercomUsart *const usart, uint32_t index)
{
+ MBED_ASSERT(usart != (void*)0);
uint16_t interrupt_status;
interrupt_status = usart->INTFLAG.reg;
interrupt_status &= usart->INTENSET.reg;
@@ -560,10 +589,6 @@
usart->INTFLAG.reg = SERCOM_USART_INTFLAG_RXC;
irq_handler(serial_irq_ids[index], RxIrq);
}
- if (interrupt_status & SERCOM_USART_INTFLAG_CTSIC) { // hardware flow control
- usart->INTENCLR.reg = SERCOM_USART_INTENCLR_CTSIC;
- usart->INTFLAG.reg = SERCOM_USART_INTENCLR_CTSIC;
- }
}
}
@@ -597,37 +622,11 @@
uart_irq((SercomUsart *)UART_5, 5);
}
-void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id)
-{
- irq_handler = handler;
- serial_irq_ids[serial_get_index(obj)] = id;
-}
-
-IRQn_Type get_serial_irq_num (serial_t *obj)
+uint32_t get_serial_vector (serial_t *obj)
{
- switch ((int)pUSART_S(obj)) {
- case UART_0:
- return SERCOM0_IRQn;
- case UART_1:
- return SERCOM1_IRQn;
- case UART_2:
- return SERCOM2_IRQn;
- case UART_3:
- return SERCOM3_IRQn;
- case UART_4:
- return SERCOM4_IRQn;
- case UART_5:
- return SERCOM5_IRQn;
- default:
- MBED_ASSERT(0);
- }
-}
-
-void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable)
-{
- IRQn_Type irq_n = (IRQn_Type)0;
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
uint32_t vector = 0;
-
switch ((int)pUSART_S(obj)) {
case UART_0:
vector = (uint32_t)uart0_irq;
@@ -648,6 +647,48 @@
vector = (uint32_t)uart5_irq;
break;
}
+ return vector;
+}
+
+void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id)
+{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
+ irq_handler = handler;
+ serial_irq_ids[serial_get_index(obj)] = id;
+}
+
+IRQn_Type get_serial_irq_num (serial_t *obj)
+{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
+ switch ((int)pUSART_S(obj)) {
+ case UART_0:
+ return SERCOM0_IRQn;
+ case UART_1:
+ return SERCOM1_IRQn;
+ case UART_2:
+ return SERCOM2_IRQn;
+ case UART_3:
+ return SERCOM3_IRQn;
+ case UART_4:
+ return SERCOM4_IRQn;
+ case UART_5:
+ return SERCOM5_IRQn;
+ default:
+ MBED_ASSERT(0);
+ }
+ return SERCOM0_IRQn; // to avoid warning
+}
+
+void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable)
+{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
+ IRQn_Type irq_n = (IRQn_Type)0;
+ uint32_t vector = 0;
+
+ vector = get_serial_vector(obj);
irq_n = get_serial_irq_num(obj);
if (enable) {
@@ -680,12 +721,16 @@
******************************************************************************/
int serial_getc(serial_t *obj)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
while (!serial_readable(obj));
return _USART(obj).DATA.reg ;
}
void serial_putc(serial_t *obj, int c)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
uint16_t q = (c & SERCOM_USART_DATA_MASK);
while (!serial_writable(obj));
_USART(obj).DATA.reg = q;
@@ -694,6 +739,8 @@
int serial_readable(serial_t *obj)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
uint32_t status = 1;
if (!(_USART(obj).INTFLAG.reg & SERCOM_USART_INTFLAG_RXC)) {
status = 0;
@@ -705,6 +752,8 @@
int serial_writable(serial_t *obj)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
uint32_t status = 1;
if (!(_USART(obj).INTFLAG.reg & SERCOM_USART_INTFLAG_DRE)) {
status = 0;
@@ -725,6 +774,8 @@
***********************************/
void serial_tx_enable_event(serial_t *obj, int event, uint8_t enable)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
if(enable) {
pSERIAL_S(obj)->events |= event;
} else {
@@ -734,6 +785,8 @@
void serial_rx_enable_event(serial_t *obj, int event, uint8_t enable)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
if(enable) {
pSERIAL_S(obj)->events |= event;
} else {
@@ -743,6 +796,9 @@
void serial_tx_buffer_set(serial_t *obj, void *tx, int tx_length, uint8_t width)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
+ MBED_ASSERT(tx != (void*)0);
// We only support byte buffers for now
MBED_ASSERT(width == 8);
@@ -757,6 +813,9 @@
void serial_rx_buffer_set(serial_t *obj, void *rx, int rx_length, uint8_t width)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
+ MBED_ASSERT(rx != (void*)0);
// We only support byte buffers for now
MBED_ASSERT(width == 8);
@@ -771,6 +830,8 @@
void serial_set_char_match(serial_t *obj, uint8_t char_match)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
if (char_match != SERIAL_RESERVED_CHAR_MATCH) {
obj->char_match = char_match;
}
@@ -781,6 +842,8 @@
***********************************/
int serial_tx_asynch(serial_t *obj, const void *tx, size_t tx_length, uint8_t tx_width, uint32_t handler, uint32_t event, DMAUsage hint)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
MBED_ASSERT(tx != (void*)0);
if(tx_length == 0) return 0;
@@ -790,7 +853,6 @@
// if( hint == DMA_USAGE_NEVER) { //TODO: DMA to be implemented later
NVIC_ClearPendingIRQ(get_serial_irq_num(obj));
NVIC_DisableIRQ(get_serial_irq_num(obj));
- NVIC_SetPriority(get_serial_irq_num(obj), 1);
NVIC_SetVector(get_serial_irq_num(obj), (uint32_t)handler);
NVIC_EnableIRQ(get_serial_irq_num(obj));
@@ -799,20 +861,23 @@
_USART(obj).INTENSET.reg = SERCOM_USART_INTFLAG_DRE;
}
// }
+ return 0;
}
void serial_rx_asynch(serial_t *obj, void *rx, size_t rx_length, uint8_t rx_width, uint32_t handler, uint32_t event, uint8_t char_match, DMAUsage hint)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
MBED_ASSERT(rx != (void*)0);
serial_rx_enable_event(obj, SERIAL_EVENT_RX_ALL, false);
serial_rx_enable_event(obj, event, true);
serial_set_char_match(obj, char_match);
-
serial_rx_buffer_set(obj, rx, rx_length, rx_width);
// if( hint == DMA_USAGE_NEVER) { //TODO: DMA to be implemented later
NVIC_ClearPendingIRQ(get_serial_irq_num(obj));
+ NVIC_DisableIRQ(get_serial_irq_num(obj));
NVIC_SetVector(get_serial_irq_num(obj), (uint32_t)handler);
NVIC_EnableIRQ(get_serial_irq_num(obj));
@@ -820,35 +885,43 @@
_USART(obj).INTENSET.reg = SERCOM_USART_INTFLAG_RXC;
}
// }
+ return;
}
uint8_t serial_tx_active(serial_t *obj)
{
- return ((_USART(obj).INTENSET.reg & SERCOM_USART_INTFLAG_DRE) ? true : false);
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
+ return ((obj->tx_buff.length > 0) ? true : false);
}
uint8_t serial_rx_active(serial_t *obj)
{
- return ((_USART(obj).INTENSET.reg & SERCOM_USART_INTFLAG_RXC) ? true : false);
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
+ return ((obj->rx_buff.length > 0) ? true : false);
}
int serial_tx_irq_handler_asynch(serial_t *obj)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
_USART(obj).INTENCLR.reg = SERCOM_USART_INTFLAG_TXC;
+ serial_tx_abort_asynch(obj);
return SERIAL_EVENT_TX_COMPLETE & obj->serial.events;
}
int serial_rx_irq_handler_asynch(serial_t *obj)
{
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
int event = 0;
/* This interrupt handler is called from USART irq */
uint8_t *buf = (uint8_t*)obj->rx_buff.buffer;
uint8_t error_code = 0;
uint16_t received_data = 0;
-
error_code = (uint8_t)(_USART(obj).STATUS.reg & SERCOM_USART_STATUS_MASK);
-
/* Check if an error has occurred during the receiving */
if (error_code) {
/* Check which error occurred */
@@ -882,6 +955,7 @@
if((buf[obj->rx_buff.pos - 1] == obj->char_match) && (obj->serial.events & SERIAL_EVENT_RX_CHARACTER_MATCH)) {
event |= SERIAL_EVENT_RX_CHARACTER_MATCH;
}
+ _USART(obj).INTFLAG.reg = SERCOM_USART_INTFLAG_RXC;
serial_rx_abort_asynch(obj);
return event & obj->serial.events;
}
@@ -891,20 +965,19 @@
event |= SERIAL_EVENT_RX_CHARACTER_MATCH;
}
- /* check for final char event */
- if((obj->rx_buff.length) == 0) {
- event |= SERIAL_EVENT_RX_COMPLETE & obj->serial.events;
- }
-
+ /* Return to the call back if character match occured */
if(event != 0) {
serial_rx_abort_asynch(obj);
return event & obj->serial.events;
}
+ return 0;
}
int serial_irq_handler_asynch(serial_t *obj)
{
//TODO: DMA to be implemented
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
uint16_t interrupt_status;
uint8_t *buf = obj->tx_buff.buffer;
@@ -915,12 +988,9 @@
if (interrupt_status & SERCOM_USART_INTFLAG_DRE) {
/* Interrupt has another TX source */
if(obj->tx_buff.pos >= obj->tx_buff.length) {
-
/* Transfer complete. Switch off interrupt and return event. */
_USART(obj).INTENCLR.reg = SERCOM_USART_INTFLAG_DRE;
- serial_tx_abort_asynch(obj);
-
- return SERIAL_EVENT_TX_COMPLETE & obj->serial.events;
+ _USART(obj).INTENSET.reg = SERCOM_USART_INTFLAG_TXC;
} else {
while((serial_writable(obj)) && (obj->tx_buff.pos <= (obj->tx_buff.length - 1))) {
_USART(obj).DATA.reg = buf[obj->tx_buff.pos];
@@ -929,29 +999,34 @@
}
}
if (interrupt_status & SERCOM_USART_INTFLAG_TXC) {
- serial_tx_irq_handler_asynch(obj);
+ return serial_tx_irq_handler_asynch(obj);
}
if (interrupt_status & SERCOM_USART_INTFLAG_RXC) {
- serial_rx_irq_handler_asynch(obj);
+ return serial_rx_irq_handler_asynch(obj);
}
}
-
+ return 0;
}
void serial_tx_abort_asynch(serial_t *obj)
{
//TODO: DMA to be implemented
- _USART(obj).INTENSET.reg = SERCOM_USART_INTFLAG_TXC;
- obj->tx_buff.pos = 0;
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
+ _USART(obj).INTFLAG.reg = SERCOM_USART_INTFLAG_TXC;
obj->tx_buff.length = 0;
+ obj->rx_buff.pos = 0;
+
}
void serial_rx_abort_asynch(serial_t *obj)
{
//TODO: DMA to be implemented
- _USART(obj).INTENCLR.reg = SERCOM_USART_INTFLAG_RXC;
+ /* Sanity check arguments */
+ MBED_ASSERT(obj);
+ _USART(obj).INTFLAG.reg = SERCOM_USART_INTFLAG_RXC;
+ obj->rx_buff.length = 0;
obj->rx_buff.pos = 0;
- obj->rx_buff.length = 0;
}
#endif
\ No newline at end of file