STM32F030 SPI双机通信 DMA 每包数据前3个数总是不对

jojwan

我用STM32F030 SPI 做从机，和另一块板子双机通信， DMA查询方式， 主机收到的每包数据前3个数总是不对，总是是上一包的前3个数，把SPI相关代码贴出来，麻烦有经验的同学指点一下。
[mw_shl_code=c,true]
#define   NumberOfLength             100
uint8_t SPI_TxBuf [NumberOfLength];
uint8_t SPI_RxBuf [NumberOfLength];
void SPI_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
DMA_InitTypeDef DMA_InitStructure;

/* Enable the SPI peripheral */
RCC_APB2PeriphClockCmd(SPIx_CLK, ENABLE);

/* Enable the DMA peripheral */
RCC_AHBPeriphClockCmd(DMAx_CLK, ENABLE);

/* Enable the TIM peripheral */
RCC_APB1PeriphClockCmd(TIMx_CLK, ENABLE);

/* Enable SCK, MOSI, MISO and NSS GPIO clocks */
RCC_AHBPeriphClockCmd(SPIx_SCK_GPIO_CLK | SPIx_MISO_GPIO_CLK | SPIx_MOSI_GPIO_CLK |
SPIx_NSS_GPIO_CLK , ENABLE);

/* Enable TIM DMA trigger clock */
RCC_AHBPeriphClockCmd(TIMx_TRIGGER_GPIO_CLK, ENABLE);

/* SPI pin mappings */
GPIO_PinAFConfig(SPIx_SCK_GPIO_PORT, SPIx_SCK_SOURCE, SPIx_SCK_AF);
GPIO_PinAFConfig(SPIx_MOSI_GPIO_PORT, SPIx_MOSI_SOURCE, SPIx_MOSI_AF);
GPIO_PinAFConfig(SPIx_MISO_GPIO_PORT, SPIx_MISO_SOURCE, SPIx_MISO_AF);
GPIO_PinAFConfig(SPIx_NSS_GPIO_PORT, SPIx_NSS_SOURCE, SPIx_NSS_AF);

/* TIM capture compare pin mapping */
GPIO_PinAFConfig(TIMx_TRIGGER_GPIO_PORT, TIMx_TRIGGER_SOURCE, TIMx_TRIGGER_AF);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_3;

/* SPI SCK pin configuration */
GPIO_InitStructure.GPIO_Pin = SPIx_SCK_PIN;
GPIO_Init(SPIx_SCK_GPIO_PORT, &GPIO_InitStructure);

/* SPI MOSI pin configuration */
GPIO_InitStructure.GPIO_Pin = SPIx_MOSI_PIN;
GPIO_Init(SPIx_MOSI_GPIO_PORT, &GPIO_InitStructure);

/* SPI MISO pin configuration */
GPIO_InitStructure.GPIO_Pin = SPIx_MISO_PIN;
GPIO_Init(SPIx_MISO_GPIO_PORT, &GPIO_InitStructure);

/* SPI NSS pin configuration */
GPIO_InitStructure.GPIO_Pin = SPIx_NSS_PIN;
GPIO_Init(SPIx_NSS_GPIO_PORT, &GPIO_InitStructure);

/* Configure the TIM channelx capture compare as DMA Trigger */
GPIO_InitStructure.GPIO_Pin = TIMx_TRIGGER_PIN;
GPIO_Init(TIMx_TRIGGER_GPIO_PORT, &GPIO_InitStructure);

/* SPI configuration -------------------------------------------------------*/
SPI_I2S_DeInit(SPIx);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;//SPI_DATASIZE;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;//SPI_CPOL_Low;//
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;//SPI_CPHA_1Edge;//

SPI_InitStructure.SPI_NSS = SPI_NSS_Hard;//SPI_NSS_Soft;//
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;//SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;//SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;

/* DMA Configuration -------------------------------------------------------*/
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//DMA_Mode_Normal;//
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

SPI_I2S_DeInit(SPIx);
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
SPI_Init(SPIx, &SPI_InitStructure);

/* Initialize the FIFO threshold */
SPI_RxFIFOThresholdConfig(SPIx, SPI_RxFIFOThreshold_QF);

/* DMA channel Rx of SPI Configuration */
DMA_InitStructure.DMA_BufferSize = NumberOfLength;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SPIx_DR_ADDRESS;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SPI_RxBuf;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
DMA_Init(SPIx_RX_DMA_CHANNEL, &DMA_InitStructure);

/* DMA channel Tx of SPI Configuration */
DMA_InitStructure.DMA_BufferSize = NumberOfLength;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SPIx_DR_ADDRESS;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SPI_TxBuf;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_Init(SPIx_TX_DMA_CHANNEL, &DMA_InitStructure);

/* Enable the SPI Rx and Tx DMA requests */
SPI_I2S_DMACmd(SPIx, SPI_I2S_DMAReq_Rx, ENABLE);
SPI_I2S_DMACmd(SPIx, SPI_I2S_DMAReq_Tx, ENABLE);

/* Enable the SPI peripheral */
SPI_Cmd(SPIx, ENABLE);

/* Enable the DMA channels */
DMA_Cmd(SPIx_RX_DMA_CHANNEL, ENABLE);
DMA_Cmd(SPIx_TX_DMA_CHANNEL, ENABLE);

}

void Master_Slave_SPI_Communite(void)
{
    static unsigned char s_result = 0;
    if (DMA_GetFlagStatus(SPIx_RX_DMA_FLAG_TC) == SET)
    {
        DMA_ClearFlag(SPIx_RX_DMA_FLAG_GL);
        
        //把接收的数据放入缓存buf
        SPI_Cache_Master2DTU( SPI_RxBuf, NumberOfLength);
        memset( SPI_RxBuf, 0, NumberOfLength );
    }
   
    if (DMA_GetFlagStatus(SPIx_TX_DMA_FLAG_TC) == SET)
    {
        
        DMA_ClearFlag(SPIx_TX_DMA_FLAG_GL);
        
        //设置IO 告诉主机此时不能发数据
        master_cannot_senddata();
        DTU_Send_Cache_To_Master( &SPI_TxBuf[5], (NumberOfLength-5));

        s_result = 1;
        spi_tick_tm = 0;
    }
   
    //延时2ms后 置为IO口告诉主机可以发数据了
    if ( s_result )
    {
        if ( spi_tick_tm > (10*100)*20 ) //2ms   
        {
            s_result = 0;
            spi_tick_tm = 0;
            //设置IO 告诉主机此时不能发数据
            master_can_senddata();
        }
    }
}[/mw_shl_code]

jojwan

yklstudent 发表于 2016-5-29 22:01
为什么不用DMA接受与发送中断方式？？？？

你是说接收用DMA方式，发送数据用中断方式？ 能说具体点吗，不太理解

jojwan

yklstudent 发表于 2016-5-30 15:55
Master SPI1：
SPI+DMA工作方式，发送采用SPI+DMA中断(感觉可以不用开始DMA发送中断)，接受采用SPI+DMA中 ...

谢谢。你知道我用查询的这种方式哪里有问题吗？

jojwan

yklstudent 发表于 2016-5-30 20:48
对于Slave SPI+DMA，调试总结必须先设置SPI+DMA+TX，后设置SPI+DMA+RX
根据这个经验提示，你可以试试

哎，SPI还是避不开的劫呀~
你好，你说的先设置SPI+DMA+TX，是先查询到TX后先清除标志，填缓冲区，再恢复，再查询RX，清除标志，取缓冲区数据，是这样的吗？
现在我的从机程序一包数据分两次发，第二次数据就不对