stm32F030 SPI+DMA+NRF发送数据缓慢

johnney · 发表于 2017-11-17 17:21:36

各位大佬好！
我在F0的SPI以DMA的方式往NRF发送数据（以正常的方式，不是循环方式）

void SPI1_DMA_Configuration( void )
{
//RCC_AHBPeriph_DMA1
  DMA_InitTypeDef DMA_InitStructure;
/* DMA1 Channel12 RX*/
DMA_DeInit(DMA1_Channel4);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&(SPI2->DR));//?? SPI1 ????(0x4001300C) ??(????)
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SPI1_RX_Buff;                   //?? SRAM ????(????)
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;                               //???? ??-??
  DMA_InitStructure.DMA_BufferSize = SPI_SendBufferSize;                      //?? SPI1 ????
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //only once
  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel4, &DMA_InitStructure);

DMA_ITConfig(DMA1_Channel4, DMA_IT_TC, DISABLE);       //DISABLE finish trans IRQ
  DMA_ITConfig(DMA1_Channel4, DMA_IT_TE, DISABLE);                //DISABLE error IRQ

  /* DMA1 Channel5 (triggered by SPI1 Tx event) Config */
  DMA_DeInit(DMA1_Channel5);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&(SPI1->DR));
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SPI1_TX_Buff;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = SPI_SendBufferSize;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;                                  //only once
  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel5, &DMA_InitStructure);

  DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, DISABLE);       //DMA1_Channel3 end intrrupt-No!!!
  DMA_ITConfig(DMA1_Channel5, DMA_IT_TE, DISABLE);                                  //DMA1_Channel3 error intrrupt

  SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Rx, ENABLE);
SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, ENABLE);    //enable spi DMA send
SPI_Cmd(SPI2, ENABLE);
}

//真正写DMA
void SPI_DMA_Write(U8 *buff, U32 len)
{

DMA_Cmd(DMA1_Channel5, DISABLE);
DMA1_Channel5->CPAR = (uint32_t)(&(SPI2->DR));
  DMA1_Channel5->CMAR = (U32) buff;
  DMA1_Channel5->CNDTR = len;

DMA_Cmd(DMA1_Channel5, ENABLE);

//uart_puts("SPI_DMA_Write \r\n");
Delay_us(150);
while ( DMA_GetFlagStatus(DMA1_FLAG_TC5) == RESET );
}

//封装的接口
unsigned char SPI_DMA_WriteBuf(unsigned char reg, unsigned char buf[], unsigned char len)
{
U8 status;
CSN_0;
status = SPI_WRByte( reg);
SPI_DMA_Write(buf, len);

CSN_1;
return status;
}

这里我必须要最少等待50us，而不是10us，请问下是什么原因

johnney · 发表于 2017-11-17 17:25:34

int main(void) {
   SYSTICK_INIT();
    GPIO_INIT();
    USART_INIT();
//uart_puts("Hello OK....0\r\n");
    //NRF24L01_Initial();
    //uart_puts("Fresh Persimmon all right reserved!\r\n");
    /*************************************/
    SPI_CLK_Configuration();
    SPI_GPIO_Configuration(); SPI_Configuration();
    //DMA
   SPI1_DMA_Configuration();
   uart_puts("Hello OK....1\r\n");
   SPI_NRF_Init();
   SPI_NRF_Configure();
   NRF24L01_SetMode(Mode_NRF24L01_MODE_TX);
    time1 = GetTickCount();
    for(;;) {
//uart_puts("A\r\n");
SPI_DMA_SendData2NRF(tx_buf);
         NRF_Bytes2Air();
            }
}