TI中文支持网Part Number:TMS570LC4357
第一次使用TI芯片，在TMS570LC4357上做SPI双机通信测试。SPI3做主机，SPI1做从机。从机通过DMA进行数据接收与发送，实测过程中通过示波器发现，主机正常产生CS、SCK、MOSI信号，MISO读取为0。硬件连接确认正确，但是从机SPI1无法接收数据，也无法发送数据（发出数据为默认值0x00），请教各位网友，我的DMA进行如下配置存在什么问题？或者应该如何配置？
uint16 SPI1_TX_Data[D_SIZE];
uint16 SPI1_RX_Data[D_SIZE];
g_dmaCTRL g_dmaCTRLPKT1;
g_dmaCTRL g_dmaCTRLPKT2;
void DMA_Config(void)
{
dmaEnable();
//DMA发送 通道0
g_dmaCTRLPKT1.SADD = (uint32)&SPI1_TX_Data[0]; // source address
g_dmaCTRLPKT1.DADD = (uint32)(&(spiREG1->DAT1)); // destination address
g_dmaCTRLPKT1.CHCTRL = 0; // channel control
g_dmaCTRLPKT1.FRCNT = 1; // frame count
g_dmaCTRLPKT1.ELCNT = D_SIZE; // element count
g_dmaCTRLPKT1.ELDOFFSET = 0; // element destination offset
g_dmaCTRLPKT1.ELSOFFSET = 0; // element source offset
g_dmaCTRLPKT1.FRDOFFSET = 0; // frame destination offset
g_dmaCTRLPKT1.FRSOFFSET = 0; // frame source offset
g_dmaCTRLPKT1.PORTASGN = PORTA_READ_PORTB_WRITE;
g_dmaCTRLPKT1.RDSIZE = ACCESS_16_BIT; // read size
g_dmaCTRLPKT1.WRSIZE = ACCESS_16_BIT; // write size
g_dmaCTRLPKT1.TTYPE = FRAME_TRANSFER; // transfer type
g_dmaCTRLPKT1.ADDMODERD = ADDR_INC1; // address mode read
g_dmaCTRLPKT1.ADDMODEWR = ADDR_FIXED; // address mode write
g_dmaCTRLPKT1.AUTOINIT = AUTOINIT_ON; // autoinit
//DMA接收 通道1
g_dmaCTRLPKT2.SADD = (uint32)(&(spiREG1->BUF)); // source address
g_dmaCTRLPKT2.DADD = (uint32)&SPI1_RX_Data[0]; // destination address
g_dmaCTRLPKT2.CHCTRL = 0; // channel control
g_dmaCTRLPKT2.FRCNT = 1; // frame count
g_dmaCTRLPKT2.ELCNT = D_SIZE; // element count
g_dmaCTRLPKT2.ELDOFFSET = 0; // element destination offset
g_dmaCTRLPKT2.ELSOFFSET = 0; // element destination offset
g_dmaCTRLPKT2.FRDOFFSET = 0; // frame destination offset
g_dmaCTRLPKT2.FRSOFFSET = 0; // frame destination offset
g_dmaCTRLPKT2.PORTASGN = PORTB_READ_PORTA_WRITE;
g_dmaCTRLPKT2.RDSIZE = ACCESS_16_BIT; // read size
g_dmaCTRLPKT2.WRSIZE = ACCESS_16_BIT; // write size
g_dmaCTRLPKT2.TTYPE = FRAME_TRANSFER; // transfer type
g_dmaCTRLPKT2.ADDMODERD = ADDR_FIXED; // address mode read
g_dmaCTRLPKT2.ADDMODEWR = ADDR_INC1; // address mode write
g_dmaCTRLPKT2.AUTOINIT = AUTOINIT_ON; // autoinit
/* – setting dma control packets */
dmaSetCtrlPacket(DMA_CH0,g_dmaCTRLPKT1); // CH0–发送
dmaSetCtrlPacket(DMA_CH1,g_dmaCTRLPKT2); // CH1–接收
dmaSetPriority(DMA_CH0, LOWPRIORITY);
dmaSetPriority(DMA_CH1, HIGHPRIORITY);
spiREG1->INT0 = (spiREG1->GCR1 & 0xFFFEFFFFU) | 0x00010000U; //启用SPI1的DMA请求
dmaReqAssign(DMA_CH0, DMA_REQ1); //Request line 1:SPI1 TX
dmaReqAssign(DMA_CH1, DMA_REQ0); //Request line 0:SPI1 RX
/* – setting the dma channel to trigger on h/w request */
dmaSetChEnable(DMA_CH0,DMA_HW); // Enable channel 0 on hardware event
dmaSetChEnable(DMA_CH1,DMA_HW); // Enable channel 1 on hardware event
dmaEnableInterrupt(DMA_CH1,FTC,DMA_INTA); //帧传输完成进入中断，此处DMA接收中断，意为帧从外设到内存完成一次帧传输
}
int main(void)
{
/* USER CODE BEGIN (3) */
spiDAT1_t dataconfig1_t;
dataconfig1_t.CS_HOLD = TRUE;
dataconfig1_t.WDEL = TRUE;
dataconfig1_t.DFSEL = SPI_FMT_0;
dataconfig1_t.CSNR = 0xFE;
loadDataPattern2(D_SIZE,SPI1_TX_Data); //F….0
loadDataPattern1(D_SIZE,SPI3_TX_Data); //0….F
rtiInit();
gioInit();
sciInit();
spiInit();
sciEnableNotification(sciREG1,SCI_RX_INT);
rtiEnableNotification(rtiREG1,rtiNOTIFICATION_COMPARE0);
rtiStartCounter(rtiREG1,rtiCOUNTER_BLOCK0);
DMA_Config(); //配置DMA通道并使能其帧发送完成中断
spiREG1->GCR1 = (spiREG1->GCR1 & 0xFEFFFFFFU) | 0x01000000U;
spiREG3->GCR1 = (spiREG3->GCR1 & 0xFEFFFFFFU) | 0x01000000U;
_enable_IRQ_interrupt_();
while(1)
{
if(RTI_FLAG==1)
{
TX_DATA[10]+=0x01;
gioToggleBit(gioPORTB,6);
gioToggleBit(gioPORTB,7);
printf("hahaha\r\n");
spiTransmitAndReceiveData(spiREG3, &dataconfig1_t, D_SIZE, SPI3_TX_Data, SPI3_RX_Data);
memset(SPI3_RX_Data,0,D_SIZE);
RTI_FLAG=0;
}
}
/* USER CODE END */
return 0;
}
Cherry Zhou：
Hi Rui Kwok,
问题我们升级到E2E给美国工程师看下，您可以在下面的link中跟进该问题：
https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1239793/tms570lc4357-spi1-cannot-use-dma-for-first-data
,
Rui Kwok：
谢谢
