stm32f4 spi+dma Опции

[Vichkins]

пытаюсь соединить 2 контроллера по SPI, решил сразу реализовывать с DMA, контроллер stm32f407 с FreeRTOS
проблема в том что приём работает вроде бы нормально, то есть если MISO подцепить на землю или 3.3v то в буфере либо 0x00 либо 0xff. Но если соединить MOSI и MISO, то принимается всегда 0xff, хотя массив на отправку исправно заполняется рандомными числами
логического анализатора нет, вот сижу и гадаю что не так сделал
или MOSI и MISO попросту нельзя накоротко соединять ?

CODE

volatile uint8_t SPI_Buffer_Rx[SPI_BUFFER_SIZE];
volatile uint8_t SPI_Buffer_Tx[SPI_BUFFER_SIZE];

volatile uint8_t Transfer_device;
volatile uint8_t SPI_TransferCompl;

DMA_InitTypeDef DMA_InitStructureTX;
DMA_InitTypeDef DMA_InitStructureRX;




void Init_SPI()
{
SPI_InitTypeDef SPI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

SPI_TransferCompl=1;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);

GPIO_PinAFConfig(GPIOB, GPIO_PinSource12, GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_SetBits(GPIOB, GPIO_Pin_11);


SPI_InitStructure.SPI_Direction=SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode=SPI_Mode_Master;
SPI_InitStructure.SPI_BaudRatePrescaler=SPI_BaudRatePrescaler_64;
SPI_InitStructure.SPI_CPHA=SPI_CPHA_1Edge;
SPI_InitStructure.SPI_CPOL=SPI_CPOL_Low;
SPI_InitStructure.SPI_NSS=SPI_NSS_Soft;
SPI_InitStructure.SPI_DataSize=SPI_DataSize_8b;
SPI_InitStructure.SPI_FirstBit=SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial=7;
SPI_Init(SPI2, &SPI_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 6;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

DMA_Cmd(DMA1_Stream3, DISABLE);
DMA_Cmd(DMA1_Stream4, DISABLE);
/* SPI_MASTER_Rx_DMA_Channel configuration */
DMA_StructInit(&DMA_InitStructureRX);
DMA_InitStructureRX.DMA_PeripheralBaseAddr = (uint32_t)(&SPI2->DR);
DMA_InitStructureRX.DMA_Memory0BaseAddr = (uint32_t)SPI_Buffer_Rx;
DMA_InitStructureRX.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructureRX.DMA_BufferSize = SPI_BUFFER_SIZE;
DMA_InitStructureRX.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructureRX.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructureRX.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructureRX.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructureRX.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructureRX.DMA_Priority = DMA_Priority_High;
DMA_InitStructureRX.DMA_Channel = DMA_Channel_0;
DMA_InitStructureRX.DMA_FIFOMode = DMA_FIFOMode_Disable;

/* SPI_MASTER_Tx_DMA_Channel configuration */
DMA_StructInit(&DMA_InitStructureTX);
DMA_InitStructureTX.DMA_PeripheralBaseAddr = (uint32_t)(&SPI2->DR);
DMA_InitStructureTX.DMA_Memory0BaseAddr = (uint32_t)SPI_Buffer_Tx;
DMA_InitStructureTX.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructureTX.DMA_BufferSize = SPI_BUFFER_SIZE;
DMA_InitStructureTX.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructureTX.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructureTX.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructureTX.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructureTX.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructureTX.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructureTX.DMA_Channel = DMA_Channel_0;
DMA_InitStructureTX.DMA_FIFOMode = DMA_FIFOMode_Disable;

Debug("SPI initialized.");
}


void SPI_Start(int device)
{
Transfer_device=device;
SPI_TransferCompl=0;

DMA_DeInit(DMA1_Stream3);
DMA_DeInit(DMA1_Stream4);
DMA_Init(DMA1_Stream3, &DMA_InitStructureRX);
DMA_Init(DMA1_Stream4, &DMA_InitStructureTX);

DMA_ITConfig(DMA1_Stream3, DMA_IT_TC, ENABLE);

SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Rx, ENABLE);
SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, ENABLE);
SPI_I2S_ClearFlag(SPI2, SPI_I2S_FLAG_RXNE);
SPI_I2S_ClearFlag(SPI2, SPI_I2S_FLAG_TXE);

SPI_Cmd(SPI2, ENABLE);

switch(Transfer_device){
case SPI_DEVICE_SERVO:
GPIO_ResetBits(GPIOB, GPIO_Pin_11);
break;
case SPI_DEVICE_OSD:
//GPIO_ResetBits(GPIOB, GPIO_Pin_11);
break;
}

DMA_Cmd(DMA1_Stream3, ENABLE);
DMA_Cmd(DMA1_Stream4, ENABLE);
}


void DMA1_Stream3_IRQHandler(void)
{
if(DMA_GetITStatus(DMA1_Stream3, DMA_IT_TCIF3))
{
switch(Transfer_device){
case SPI_DEVICE_SERVO:
GPIO_SetBits(GPIOB, GPIO_Pin_11);
break;
case SPI_DEVICE_OSD:
//GPIO_SetBits(GPIOB, GPIO_Pin_11);
break;
}

DMA_ClearITPendingBit(DMA1_Stream3, DMA_IT_TCIF3);
DMA_Cmd(DMA1_Stream3, DISABLE);
DMA_Cmd(DMA1_Stream4, DISABLE);
SPI_TransferCompl=1;
}
}

так проверяю что пришло:

CODE

void pvDebugTask( void *pvParameters )
{
int i;

for(i=0;i<SPI_BUFFER_SIZE;i++){
SPI_Buffer_Tx[i]=rand();
}

while(1){
SPI_Start(SPI_DEVICE_SERVO);
while(!SPI_TransferCompl){};

for(i=0;i<SPI_BUFFER_SIZE;i++){
printf("%x ", SPI_Buffer_Rx[i]);
}
printf("\r\n");

vTaskDelay(1000);
}
}

Сообщение отредактировал Vichkins - Mar 5 2012, 11:34