TI中文支持网使用msp430f5529运行ti-rtos驱动spi仿真发现从spi的RXBUF中有数据，程序运行时无法跳过SPI_transfer()，运行到__no_operation();。
主要的taskFxn函数如下。
void pm25ld020taskFxn(UArg arg0, UArg arg1) {
GPIO_write(ZKS_GASSENSOR_X2_SPI_PM25LD020_CE,
ZKS_GASSENSOR_X2_PM25LD020_ENABLE);
SPI_Handle spi_handle_pm25ld020;
Bool transferOK;
SPI_Params spiParams_pm25ld020;
SPI_Params_init(&spiParams_pm25ld020);
spiParams_pm25ld020.transferMode = SPI_MODE_BLOCKING;
spiParams_pm25ld020.transferCallbackFxn = NULL;
spiParams_pm25ld020.bitRate = 8000000;
spi_handle_pm25ld020 = SPI_open(Board_SPI_PM25LD020, &spiParams_pm25ld020);
SPI_Transaction spi_transaction_pm25ld020;
UChar transmitBuffer[1] = { 0x9f };
UChar receiveBuffer[4] = { 0x04 };
spi_transaction_pm25ld020.count = 4;
spi_transaction_pm25ld020.txBuf = (Ptr) transmitBuffer;
spi_transaction_pm25ld020.rxBuf = (Ptr) receiveBuffer;
transferOK = SPI_transfer(spi_handle_pm25ld020, &spi_transaction_pm25ld020);
__no_operation();
GPIO_write(ZKS_GASSENSOR_X2_SPI_PM25LD020_CE,
ZKS_GASSENSOR_X2_PM25LD020_DISABLE);
if (!transferOK) {
/* Error in SPI transfer or transfer is already in progress */
}
}
灰小子：
你追踪一下SPI_transfer函数，看看都做了什么
c y：
回复 灰小子:
RTOS 中的spi嵌套了dma，现在问题应该是出在DMA上，应该怎么解决呢
DMA的配置没有修改程序如下
Void MSP_EXP430F5529LP_isrDMA(UArg arg){ /* Call the SPI DMA function, passing the SPI handle used for WiFi */ SPI_serviceISR((SPI_Handle) &(SPI_config[0])); __no_operation();}
#if defined(__TI_COMPILER_VERSION__)#pragma DATA_SECTION(SPI_config, ".const:SPI_config")#pragma DATA_SECTION(spiUSCIBDMAHWAttrs, ".const:spiUSCIBDMAHWAttrs")#endif
#include <ti/drivers/SPI.h>#include <ti/drivers/spi/SPIUSCIBDMA.h>
SPIUSCIBDMA_Object spiUSCIBDMAObjects[MSP_EXP430F5529LP_SPICOUNT];uint8_t spiUSCIBDMAscratchBuf[MSP_EXP430F5529LP_SPICOUNT];
const SPIUSCIBDMA_HWAttrs spiUSCIBDMAHWAttrs[MSP_EXP430F5529LP_SPICOUNT] = { { .baseAddr = USCI_B0_BASE, .clockSource = USCI_B_SPI_CLOCKSOURCE_SMCLK, .bitOrder = USCI_B_SPI_MSB_FIRST, .scratchBufPtr = &spiUSCIBDMAscratchBuf[0], .defaultTxBufValue = 0,
/* DMA */ .dmaBaseAddr = DMA_BASE, /* Rx Channel */ .rxDMAChannelIndex = DMA_CHANNEL_1, .rxDMASourceTrigger = DMA_TRIGGERSOURCE_18, /* Tx Channel */ .txDMAChannelIndex = DMA_CHANNEL_0, .txDMASourceTrigger = DMA_TRIGGERSOURCE_19 }};
const SPI_Config SPI_config[] = { { .fxnTablePtr = &SPIUSCIBDMA_fxnTable, .object = &spiUSCIBDMAObjects[0], .hwAttrs = &spiUSCIBDMAHWAttrs[0] }, {NULL, NULL, NULL},};
c y：
回复 灰小子:
如果不想嵌套DMA有应该怎么实现rtos&spi
