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I2S on STM32F0

luke2
Associate II
Posted on March 01, 2016 at 19:56

So I am trying to output an I2S signal from a STM32F0 but although I believe I am initializing the peripheral correctly I am not getting any signal on the pins. I believe I am enabling the appropriate clocks and have the pin/DMA mapping correct based on the information I have. What am I missing? My code is as follows:

I2S_InitTypeDef I2S_InitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

DMA_InitTypeDef DMA_InitStructure;

audio[0] = 0x5555;

audio[1] = 0x0;

audio[2] = 0x5555;

audio[3] = 0x0;

audio[4] = 0x5555;

audio[5] = 0xffff;

audio[6] = 0xffff;

audio[7] = 0xffff;

audio[8] = 0xffff;

audio[9] = 0xffff;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); 

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_7;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource4, GPIO_AF_0);  // I2S1 WS (word select)

GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_0);  // I2S1 CK (serial clock)

GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_0);  // I2S1 SD (serial data)

// I2S1 peripheral configuration

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

I2S_InitStructure.I2S_Standard    = I2S_Standard_Phillips;

I2S_InitStructure.I2S_DataFormat  = I2S_DataFormat_16b;//32b;//24b;

I2S_InitStructure.I2S_AudioFreq   = I2S_AudioFreq_8k;

I2S_InitStructure.I2S_CPOL        = I2S_CPOL_Low;

I2S_InitStructure.I2S_MCLKOutput  = I2S_MCLKOutput_Enable;//Disable;//

I2S_InitStructure.I2S_Mode        = I2S_Mode_MasterTx;

I2S_Init(SPI1, &I2S_InitStructure);

// DMA configuration for audio streaming

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;

DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&SPI1->DR;  // SPI data register for sending

DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)audio;

DMA_InitStructure.DMA_BufferSize = 10;

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;

DMA_InitStructure.DMA_Priority = DMA_Priority_High;

DMA_Init(DMA1_Channel3, &DMA_InitStructure);

SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE);

DMA_Cmd(DMA1_Channel3, ENABLE);                   // Enable/Disable DMA

I2S_Cmd(SPI1, ENABLE);
1 REPLY 1
luke2
Associate II
Posted on March 01, 2016 at 20:39

It turns out the particular STM32F03 model I was using does not implement I2S, so I switched to STM32F05 which seems to be working now.