michael hollegha
More readable TLV320 Lib
Diff: I2SSlaveHL.cpp
- Revision:
- 0:808bb0b9cf45
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/I2SSlaveHL.cpp Wed Oct 22 09:23:47 2014 +0000
@@ -0,0 +1,247 @@
+
+#include "I2SSlaveHL.h"
+
+FunctionPointer akjnh3489v8ncv;
+
+extern "C" void I2S_IRQHandler(void) {
+ akjnh3489v8ncv.call();
+}
+
+#undef MBV
+#define MBV(num) (1<<num)
+
+I2SSlave::I2SSlave(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws)
+{
+ storePins_(tx_sda, tx_ws, clk, rx_sda, rx_ws);
+ format(16, STEREO);
+}
+
+void I2SSlave::format(int bit, bool mode)
+{
+ bit_ = bit;
+ mode_ = mode;
+ initialize_(tx_sda_, tx_ws_, clk_, rx_sda_, rx_ws_);
+}
+
+
+void I2SSlave::Write(int32_t aLeft, int32_t aRight)
+{
+ int32_t lr = (aRight << 16) + aLeft;
+ LPC_I2S->I2STXFIFO = lr;
+}
+
+void I2SSlave::Read(int32_t* aLeft, int32_t* aRight)
+{
+ int32_t v32 = LPC_I2S->I2SRXFIFO;
+ *aLeft = (int16_t)v32;
+ *aRight = (int16_t)(v32 >> 16);
+}
+
+
+
+void I2SSlave::start(int mode)
+{
+ switch(mode){
+ case(0):
+ LPC_I2S->I2SIRQ |= (0 << 0); //disable receive interrupt
+ LPC_I2S->I2SIRQ |= (0 << 1); //disable transmit interrupt
+ break;
+ case(1):
+ LPC_I2S->I2SIRQ |= (0 << 0); //disable receive interrupt
+ LPC_I2S->I2SIRQ |= (1 << 1); //enable transmit interrupt
+ LPC_I2S->I2SIRQ |= (0 << 16); //set I2STXFIFO depth to 0 words
+ break;
+ case(2):
+ LPC_I2S->I2SIRQ |= (1 << 0); //enable receive interrupt
+ LPC_I2S->I2SIRQ |= (0 << 1); //disable transmit interrupt
+ LPC_I2S->I2SIRQ |= (4 << 8); //set I2SRXFIFO depth to 4 words
+ break;
+ case(3):
+ LPC_I2S->I2SIRQ |= (1 << 0); //enable receive interrupt
+ LPC_I2S->I2SIRQ |= (4 << 8); //set I2SRXFIFO depth to 4 words
+ LPC_I2S->I2SIRQ |= (1 << 1); //enable transmit interrupt
+ LPC_I2S->I2SIRQ |= (0 << 16); //set I2STXFIFO depth to 0 words
+ break;
+ default:
+ break;
+ }
+ NVIC_SetPriority(I2S_IRQn, 0);
+ NVIC_EnableIRQ(I2S_IRQn); //enable I2S interrupt in the NVIC
+}
+
+void I2SSlave::Start()
+{
+ LPC_I2S->I2SIRQ = 0;
+ LPC_I2S->I2SIRQ |= MBV(0); // ena RecvIRQ
+ // LPC_I2S->I2SIRQ |= MBV(8); // Rx-Level=1
+ LPC_I2S->I2SIRQ |= MBV(11); // Rx-Level=8
+ NVIC_SetPriority(I2S_IRQn, 0);
+ NVIC_EnableIRQ(I2S_IRQn);
+}
+
+void I2SSlave::Stop()
+{
+ NVIC_DisableIRQ(I2S_IRQn);
+}
+
+int I2SSlave::status(void)
+{
+ return LPC_I2S->I2SSTATE;
+}
+
+int I2SSlave::GetRxLevel()
+{
+ int val = LPC_I2S->I2SSTATE >> 8;
+ return (0x0000000F & val);
+}
+
+int I2SSlave::GetTxLevel()
+{
+ int val = LPC_I2S->I2SSTATE >> 16;
+ return (0x0000000F & val);
+}
+
+
+int I2SSlave::initialize_(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws)
+{
+ setPins_(tx_sda, tx_ws, clk, rx_sda, rx_ws); // designate pins
+ LPC_SC->PCONP |= (1 << 27);
+ //configure input/output register
+ format_(bit_, mode_);
+ //set mbed as SLAVE
+ LPC_I2S->I2SDAO |= (1 << 5);
+ LPC_I2S->I2SDAI |= (1 << 5);
+ //clock mode
+ setClocks_(4);
+ //set slave mode
+ modeConfig_();
+ //set receiver mode
+ LPC_I2S->I2SRXMODE |= (1 << 1);
+ //slave mode
+ LPC_I2S->I2STXRATE = 0;
+ LPC_I2S->I2SRXRATE = 0;
+ //Start
+ LPC_I2S->I2SDAO |= (0 << 3);
+ LPC_I2S->I2SDAI |= (0 << 3);
+ LPC_I2S->I2SDAO |= (0 << 4);
+ LPC_I2S->I2SDAI |= (0 << 4);
+ LPC_I2S->I2SDAO |= (0 << 15);
+ return 0;
+}
+
+// Set the division setting on the internal clocks
+void I2SSlave::setClocks_(int divideBy)
+{
+ switch(divideBy){
+ case 1:
+ LPC_SC->PCLKSEL1 |= (1 << 22);
+ LPC_SC->PCLKSEL1 |= (0 << 23);
+ break;
+ case 2:
+ LPC_SC->PCLKSEL1 |= (0 << 22);
+ LPC_SC->PCLKSEL1 |= (1 << 23);
+ break;
+ case 4:
+ LPC_SC->PCLKSEL1 |= (0 << 22);
+ LPC_SC->PCLKSEL1 |= (0 << 23);
+ break;
+ case 8:
+ LPC_SC->PCLKSEL1 |= (1 << 22);
+ LPC_SC->PCLKSEL1 |= (1 << 23);
+ break;
+ default:
+ break;
+ }
+}
+
+void I2SSlave::setPins_(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws)
+{
+ if(rx_ws == p29){
+ LPC_PINCON->PINSEL0 |= (1 << 10); //set p29 as receive word select line
+ } else {
+ LPC_PINCON->PINSEL1 |= (2 << 16); //set p16 as receive word select line
+ }
+ if(rx_sda == p8){
+ LPC_PINCON->PINSEL0 |= (1 << 12); //set p8 as receive serial data line
+ } else {
+ LPC_PINCON->PINSEL1 |= (2 << 18); //set p17 as receive serial data line
+ }
+ LPC_PINCON->PINSEL0 |= (1 << 14); //set p7 as transmit clock line (only one of these)
+ LPC_PINCON->PINSEL0 |= (1 << 16); //set p6 as word select line (only one of these)
+ LPC_PINCON->PINSEL0 |= (1 << 18); //set p5 as transmit serial data line (only one of these)
+ LPC_PINCON->PINSEL0 |= (0 << 8); //clear rx_clk
+}
+
+
+void I2SSlave::format_(int bit, bool mode)
+{
+ uint32_t bps= ((bit+1)*8)-1;
+ LPC_I2S->I2SDAO &= (0x00 << 6);
+ LPC_I2S->I2SDAO |= (bps << 6);
+ //set bit length
+ switch(bit){
+ case 8:
+ LPC_I2S->I2SDAO &= 0xfffffffc;
+ break;
+ case 16:
+ LPC_I2S->I2SDAO &= (0 << 1);
+ LPC_I2S->I2SDAO |= (1 << 0);
+ break;
+ case 32:
+ LPC_I2S->I2SDAO &= (0 << 1);
+ LPC_I2S->I2SDAO |= (3 << 0);
+ break;
+ default:
+ break;
+ }
+ //set audio mode
+ if(mode == STEREO){
+ LPC_I2S->I2SDAO |= (0 << 2);
+ } else {
+ LPC_I2S->I2SDAO |= (1 << 2);
+ }
+ //set transmitter and receiver setting to be the same
+ LPC_I2S->I2SDAI &= (0x00 << 6);
+ LPC_I2S->I2SDAI |= (bps << 6);
+ //set bit length
+ switch(bit){
+ case 8:
+ LPC_I2S->I2SDAI &= 0xfffffffc;
+ break;
+ case 16:
+ LPC_I2S->I2SDAI &= (0 << 1);
+ LPC_I2S->I2SDAI |= (1 << 0);
+ break;
+ case 32:
+ LPC_I2S->I2SDAI &= (0 << 1);
+ LPC_I2S->I2SDAI |= (3 << 0);
+ break;
+ default:
+ break;
+ }
+ //set audio mode
+ if(mode == STEREO){
+ LPC_I2S->I2SDAI |= (0 << 2);
+ } else {
+ LPC_I2S->I2SDAI |= (1 << 2);
+ }
+}
+
+
+void I2SSlave::modeConfig_(void)
+{
+ LPC_I2S->I2STXMODE |= (0x0 << 0);
+ LPC_I2S->I2SRXMODE |= (0x0 << 0);
+}
+
+
+void I2SSlave::storePins_(PinName tx_sda, PinName tx_ws, PinName clk, PinName rx_sda, PinName rx_ws)
+{
+ tx_sda_ = tx_sda;
+ tx_ws_ = tx_ws;
+ clk_ = clk;
+ rx_sda_ = rx_sda;
+ rx_ws_ = rx_ws;
+}
+
+