Posted on January 28, 2015 at 14:08
I’m having a problem with my project.
The project is just a simple sound “loop�?
It is a stm32f4discovery connected to a audio codec. They communicate over I2S3 in Full Duplex mode and the stm32f4 uses DMA to handle data.
My problem is this: I’m able to send data out, but not receive any my Rx buffer is written to zero all the time.
So I can see my data is on the SD_EXT line, but I’m just not able to get it inside the stm32f4.
My Code:
Defines:
//I2S
#define CODEC_I2S SPI3
#define CODEC_I2S_EXT I2S3ext
#define CODEC_I2S_CLK RCC_APB1Periph_SPI3
//DMA DEFINES
#define I2S_DMA_CLOCK RCC_AHB1Periph_DMA1
#define AUDIO_I2S_EXT_DMA_FLAG_TC ((uint32_t)0x18000000)
#define AUDIO_I2S_DMA_FLAG_TC DMA_FLAG_TCIF7
//DMA_InitStructure
#define AUDIO_I2S_DMA_STREAM DMA1_Stream7
#define AUDIO_I2S_DMA_CHANNEL DMA_Channel_0
#define Audio_I2S_IRQHandler DMA1_Stream7_IRQHandler
//DMA_InitStructure2
#define AUDIO_I2S_EXT_DMA_STREAM DMA1_Stream0
#define AUDIO_I2S_EXT_DMA_CHANNEL DMA_Channel_3
#define Audio_I2S_EXT_IRQHandler DMA1_Stream0_IRQHandler
//PLAY
#define AUDIO_I2S_DMA_IRQ DMA1_Stream7_IRQn
#define AUDIO_I2S_EXT_DMA_IRQ DMA1_Stream0_IRQnInit Configuration:
void AudioInit(void)
{
GPIO_InitTypeDef PinInitStruct;
GPIO_StructInit(&PinInitStruct);
DMA_InitTypeDef DMA_InitStructure;
DMA_InitTypeDef DMA_InitStructure2;
I2S_InitTypeDef I2S_InitType;
/**********************************************************
PIN & PORT settings
**********************************************************/
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOD , ENABLE);
//Reset pin as GPIO
PinInitStruct.GPIO_Pin = I2S_RESET_PIN;
PinInitStruct.GPIO_Mode = GPIO_Mode_OUT;
PinInitStruct.GPIO_PuPd = GPIO_PuPd_DOWN;
PinInitStruct.GPIO_OType = GPIO_OType_PP;
PinInitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(I2S_RESET_Port, &PinInitStruct);
//I2S pins
PinInitStruct.GPIO_Mode = GPIO_Mode_AF;
PinInitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
PinInitStruct.GPIO_Pin = I2S_MCLK_PIN;
GPIO_Init(I2S_MCLK_Port, &PinInitStruct);
PinInitStruct.GPIO_Pin = I2S_SCLK_PIN;
GPIO_Init(I2S_SCLK_Port, &PinInitStruct);
PinInitStruct.GPIO_Pin = I2S_WS_PIN;
GPIO_Init(I2S_WS_Port, &PinInitStruct);
PinInitStruct.GPIO_Pin = I2S_SD_PIN ;
GPIO_Init(I2S_SD_Port, &PinInitStruct);
PinInitStruct.GPIO_Pin = I2S_SD_ext_PIN ;
GPIO_Init(I2S_SD_ext_Port, &PinInitStruct);
//prepare output ports for alternate function
GPIO_PinAFConfig(I2S_WS_Port, I2S_WS_PinSource, SPI);
GPIO_PinAFConfig(I2S_MCLK_Port, I2S_MCLK_PinSource, SPI);
GPIO_PinAFConfig(I2S_SCLK_Port, I2S_SCLK_PinSource, SPI);
GPIO_PinAFConfig(I2S_SD_Port, I2S_SD_PinSource, SPI);
GPIO_PinAFConfig(I2S_SD_ext_Port, I2S_SD_ext_PinSource, SPI);
/**********************************************************
I2S settings
**********************************************************/
//enable I2S clock
RCC_APB1PeriphClockCmd(CODEC_I2S_CLK, ENABLE);
RCC_PLLI2SCmd(ENABLE);
// configure I2S port
SPI_I2S_DeInit(CODEC_I2S);
I2S_InitType.I2S_AudioFreq = I2S_AudioFreq_44k; // SET the Freq
I2S_InitType.I2S_MCLKOutput = I2S_MCLKOutput_Enable;
I2S_InitType.I2S_DataFormat = I2S_DataFormat_16b;
I2S_InitType.I2S_Mode = I2S_Mode_MasterTx;
I2S_InitType.I2S_Standard = I2S_Standard_Phillips;
I2S_InitType.I2S_CPOL = I2S_CPOL_Low;
/* Initialize the I2S main channel for TX */
I2S_Init(CODEC_I2S, &I2S_InitType);
/* Initialize the I2S extended channel for RX */
I2S_FullDuplexConfig(CODEC_I2S_EXT, &I2S_InitType);
/**********************************************************
DMA settings
**********************************************************/
/* Enable the DMA clock */
RCC_AHB1PeriphClockCmd(I2S_DMA_CLOCK, ENABLE);
/* Configure the DMA Stream */
DMA_Cmd(AUDIO_I2S_DMA_STREAM, DISABLE);
DMA_Cmd(AUDIO_I2S_EXT_DMA_STREAM, DISABLE);
DMA_DeInit(AUDIO_I2S_DMA_STREAM);
DMA_DeInit(AUDIO_I2S_EXT_DMA_STREAM);
/* Set the parameters to be configured */
DMA_InitStructure.DMA_Channel = AUDIO_I2S_DMA_CHANNEL;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&SPI3->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)txdata;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructure.DMA_BufferSize = I2S_BufferSize;
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_Mode_Normal; //
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(AUDIO_I2S_DMA_STREAM, &DMA_InitStructure);
/* Set the parameters to be configured */
DMA_InitStructure2.DMA_Channel = AUDIO_I2S_EXT_DMA_CHANNEL;
DMA_InitStructure2.DMA_PeripheralBaseAddr = (uint32_t)&I2S3ext->DR;
DMA_InitStructure2.DMA_Memory0BaseAddr = (uint32_t)&rxdata;
DMA_InitStructure2.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure2.DMA_BufferSize = I2S_BufferSize;
DMA_InitStructure2.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure2.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure2.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure2.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure2.DMA_Mode = DMA_Mode_Circular;//DMA_Mode_Normal; //
DMA_InitStructure2.DMA_Priority = DMA_Priority_Low;
DMA_InitStructure2.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure2.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull;
DMA_InitStructure2.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure2.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(AUDIO_I2S_EXT_DMA_STREAM, &DMA_InitStructure2);
I2S_Cmd(CODEC_I2S, ENABLE); //Enables or disables the specified SPI peripheral (in I2S mode).
I2S_Cmd(CODEC_I2S_EXT, ENABLE); //Enables or disables the specified SPI peripheral (in I2S mode).
/* Enable the I2S DMA request */
SPI_I2S_DMACmd(CODEC_I2S, SPI_I2S_DMAReq_Tx, ENABLE); //Enables or disables the SPIx/I2Sx DMA interface.
SPI_I2S_DMACmd(CODEC_I2S_EXT, SPI_I2S_DMAReq_Rx, ENABLE); //Enables or disables the SPIx/I2Sx DMA interface.
/* Enable the selected DMA interrupts (selected in ''stm32f4_discovery_eval_audio_codec.h'' defines) */
//DMA_ITConfig(AUDIO_I2S_DMA_STREAM, DMA_IT_TC, ENABLE); //Enables or disables the specified DMAy Streamx interrupts.
DMA_ITConfig(AUDIO_I2S_EXT_DMA_STREAM, DMA_IT_TC, ENABLE); //Enables or disables the specified DMAy Streamx interrupts.
/* I2S DMA IRQ Channel configuration */
//NVIC_EnableIRQ(AUDIO_I2S_DMA_IRQ); //This function enables a device specific interrupt in the NVIC interrupt controller.
NVIC_EnableIRQ(AUDIO_I2S_EXT_DMA_IRQ); //This function enables a device specific interrupt in the NVIC interrupt controller.
/**********************************************************
Start
**********************************************************/
//Codec Activate
GPIO_SetBits(I2S_RESET_Port, I2S_RESET_PIN);
/* Enable the I2S DMA Streams */
DMA_Cmd(AUDIO_I2S_DMA_STREAM, ENABLE); //Enables or disables the specified DMAy Streamx.
DMA_Cmd(AUDIO_I2S_EXT_DMA_STREAM, ENABLE); //Enables or disables the specified DMAy Streamx.
}The ISR DMA Stream of the I2S3_EXT_RX:
void Audio_I2S_EXT_IRQHandler(void)
{
STM_EVAL_LEDToggle(LED5);
if(DMA_GetITStatus(AUDIO_I2S_EXT_DMA_STREAM, DMA_IT_TCIF0))
{
DMA_ClearITPendingBit(AUDIO_I2S_EXT_DMA_STREAM, DMA_IT_TCIF0);
}
}My Main is just a Init and While(1) loop blinking a led:
Thanks in advance #i2s #stm32 #full-duplex #dma
Posted on January 28, 2015 at 17:12
I'm pretty sure i checked that the pins had I2S3 as AF.
No, what Alternate Function is used by the pin. There's a trap for the unwary, and you've fallen in it.
