SPI通信问题：每发2字节就丢掉2字节

芯片：FH8610
系统：ucos
SPI参数：位宽16bit，时钟6.75MHz，极性0，相位0
问题：该芯片（从机）与wifi模块（主机）进行SPI通信时，原本要发送buf是“123456789123456789”，但实际测到的却是“1256914589”，也就是每发2字节就丢了2字节，但接收来自WiFi的数据却是正常的。

复制

void config_spi( int id )

{

    Spi_Enable( id, 0 );

    Spi_SetFrameFormat( id, SPI_MOTOROLA_MODE );

    Spi_SetPolarity( id, SPI_POLARITY_LOW );

    Spi_SetPhase( id, SPI_TXR_PHASE );

    Spi_SetDataSize( id, ((SPI_UNIT_TR_BITS == 8) ? SPI_DATA_SIZE_8BIT : 0xf));

    Spi_SetTransferMode( id, SPI_TX_RX_MODE );

    Spi_DisableIrq( id, SPI_IRQ_ALL );

    Spi_SetDmaTxDataLevel( id, 12 );        //12

    Spi_SetDmaRxDataLevel( id, 3 );         //3

    Spi_SetDmaControlDisable( id, SPI_DMA_RX_POS | SPI_DMA_TX_POS );

     

}

static void config_dma_rx( int ch )

{

    Dma_ClearIsrBit(ch,(DMA_INTT_TXR | DMA_INTT_BLOCK | DMA_INTT_SOURCE | DMA_INTT_DEST | DMA_INTT_ERR)); // new add

     

    Dma_SetTxrType( ch, DMA_TTFC_P2M_DMAC );

    Dma_SetSrcWidth( ch, ((SPI_UNIT_TR_BITS == 8) ? DMA_TXR_8BITS : DMA_TXR_16BITS));

    Dma_SetSrcSize( ch, DMA_BURST_4 );

    Dma_SetDstWidth( ch, DMA_TXR_32BITS );  //DMA_TXR_32BITS

    Dma_SetDstSize( ch, DMA_BURST_4 );

    Dma_SetSrcIncDirection( ch, DMA_DIR_UNCHG );

    Dma_SetDstIncDirection( ch, DMA_DIR_INC );

    Dma_SetSrcHsMode( ch, DMA_HSMODE_HARDWARE );

    Dma_SetFifoMode( ch, 1 );

    Dma_SetFlowCtrl( ch, 1 );

    Dma_SetHProt( ch, 6 );

    Dma_EnableIsrBit( ch, DMA_INTT_BLOCK );

}

 

static void config_dma_tx( int ch )

{

    Dma_ClearIsrBit(ch,(DMA_INTT_TXR | DMA_INTT_BLOCK | DMA_INTT_SOURCE | DMA_INTT_DEST | DMA_INTT_ERR));// new add

 

    Dma_SetTxrType( ch, DMA_TTFC_M2P_DMAC );

    Dma_SetSrcWidth( ch, DMA_TXR_32BITS );  //DMA_TXR_32BITS

    Dma_SetSrcSize( ch, DMA_BURST_4 );

    Dma_SetDstWidth( ch, ((SPI_UNIT_TR_BITS == 8) ? DMA_TXR_8BITS : DMA_TXR_16BITS));

    Dma_SetDstSize( ch, DMA_BURST_4 );

    Dma_SetSrcIncDirection( ch, DMA_DIR_INC );

    Dma_SetDstIncDirection( ch, DMA_DIR_UNCHG );

    Dma_SetDstHsMode( ch, DMA_HSMODE_HARDWARE );

    Dma_SetFifoMode( ch, 1 );

    Dma_SetFlowCtrl( ch, 1 );

    Dma_SetHProt( ch, 6 );

    Dma_EnableIsrBit( ch, DMA_INTT_BLOCK );

}

int spi_one_cycle_transfer(UINT8 idx,const UINT8 *tx_buff,UINT8 *rx_buff,UINT32 len)

{

    UINT8 ret;

     

//1.wait master pull up ack gpio

    OSSemPend(sem_wifi_ack_gpio, 0, &ret );

//2.pull up slaver ack gpio

    //Gpio_SetPortX(HW_HELP_SPI_GPIO,1);

//3.block to exchange data

#if 0

    Spi_WriteReadBlock(idx,tx_buff,rx_buff,len);

#else

    config_spi(g_spi_chan);

    Spi_SetDmaControlEnable( idx, SPI_DMA_RX_POS | SPI_DMA_TX_POS );

    Spi_Enable( g_spi_chan, 1 );

     

 

    //config tx

    config_dma_tx( g_spitx_dma_chan );

    Dma_SetSrcAddress( g_spitx_dma_chan, (unsigned int)tx_buff );

    Dma_SetDstAddress( g_spitx_dma_chan, SPI_DATA_REG );

    Dma_SetDstPer( g_spitx_dma_chan, DMA_HSP_SPI2TX );

    Dma_SetTxrSize( g_spitx_dma_chan, len >> 2 );

    Dma_EnableChan( g_spitx_dma_chan );

     

    //config rx

    config_dma_rx( g_spirx_dma_chan );

    Dma_SetSrcAddress( g_spirx_dma_chan, SPI_DATA_REG );

    Dma_SetDstAddress( g_spirx_dma_chan, (unsigned int)rx_buff );

    Dma_SetSrcPer( g_spirx_dma_chan, DMA_HSP_SPI2RX );

    Dma_SetTxrSize( g_spirx_dma_chan, (SPI_UNIT_TR_BITS == 8) ? len : (len >> 1));

    Dma_EnableChan( g_spirx_dma_chan );

 

     

 

    Gpio_SetPortX(HW_HELP_SPI_GPIO,1);

    OSSemPend(g_dmaSpiRx_done, 0, &ret);    //don't wait forever,need to change

#endif

 

//4.pull down slaver ack gpio

    Gpio_SetPortX(HW_HELP_SPI_GPIO,0);

 

    return 0;

 

}

 

static void _spiFrCCThreadFun(void *param)

{

    static unsigned char slaveRxBuff[1200] = {0};

    static unsigned char slaveTxBuff[1200] = "hellothisisfh8610";

     

    UINT8 ret;

 

 

    sem_wifi_ack_gpio = OSSemCreate(0);

     

    while(1)

    {

//1.check msg queue first.if it have,mean dsp want to send something initiative

     

//2.package data

     

//3.exchange data   

    spi_one_cycle_transfer(g_spi_chan, slaveTxBuff, slaveRxBuff, 600);

    uprintf("_spiFrCCThreadFun slaveRxBuff=%x-%x-%x-%x-%x-%x\n",slaveRxBuff[0],

        slaveRxBuff[1],slaveRxBuff[2],slaveRxBuff[3],slaveRxBuff[4],slaveRxBuff[5]);

//4.unpackage data

     

//5.analysis data

     

    }

}

有遇到类似现象的嘛，代码中的"hellothisisfh8610"，实际用逻辑分析仪抓到的是“heotsih80”

感觉是寄存器写的问题吧，还没有发送完成就写了寄存器或者清除了发送缓冲

airwill 发表于 2019-5-3 22:36
感觉是寄存器写的问题吧，还没有发送完成就写了寄存器或者清除了发送缓冲 ...

终于找到原因了，是主机的CS脚控制参数设置不当导致的，spiCC3220SDMAHWAttrs.csControl应该为SPI_SW_CTRL_CS，而不是SPI_HW_CTRL_CS，之前一直还以为是DMA的问题。。。