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; +} + +