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器件型号：CC3220SF-LAUNCHXL 主题中讨论的其他器件： CC3220SF
我正在尝试使用 SPI_TRANSFER ()在 CC3220SF-LAUNCHXL (SPI 主器件)和外部传感器(Adafruit LIS3MDL)之间建立基本 SPI 通信。 我正在 FreeRTOS 中构建一个使用 Simplelink SDK 版本2.10.00.04的应用程序。
我已成功将 器件 ID 读取命令(0xCF)发送到外部传感器。 在逻辑分析仪上、传感器以预期值(0x3D)进行响应。 但是、读取缓冲区正在接收值0xE3。 我可以反复发送传输、该值始终为0xE3。
这里是否有一些基本配置(软件或硬件)我可能会错？
SPI 配置(索引 CC3220SF_LAUNCHXL_SPI1)：
{
.baseAddr = GSPI_BASE,
.intNum = INT_GSPI,
.intPriority = (~0),
.spiPRCM = PRCM_GSPI,
.csControl = SPI_SW_CTRL_CS,
.csPolarity = SPI_CS_ACTIVELOW,
.pinMode = SPI_4PIN_MODE,
.turboMode = SPI_TURBO_OFF,
.scratchBufPtr = &spiCC3220SDMAscratchBuf[CC3220SF_LAUNCHXL_SPI1],
.defaultTxBufValue = 0,
.rxChannelIndex = UDMA_CH6_GSPI_RX,
.txChannelIndex = UDMA_CH7_GSPI_TX,
.minDmaTransferSize = 100,
.mosiPin = SPICC32XXDMA_PIN_07_MOSI,
.misoPin = SPICC32XXDMA_PIN_06_MISO,
.clkPin = SPICC32XXDMA_PIN_05_CLK,
.csPin = SPICC32XXDMA_PIN_NO_CONFIG
}
SPI_open 调用：
SPI_Params_init(&xSpiParams);
xSpiParams.transferMode = SPI_MODE_BLOCKING;
xSpiParams.transferTimeout = SPI_WAIT_FOREVER;
xSpiParams.transferCallbackFxn = NULL;
xSpiParams.mode = SPI_MASTER;
xSpiParams.bitRate = 1000000;
// xSpiParams.bitRate = 500000;
xSpiParams.dataSize = 8;
xSpiParams.frameFormat = SPI_POL0_PHA0;
// xSpiParams.frameFormat = SPI_POL1_PHA1;
xSpiHandle = SPI_open(CC3220SF_LAUNCHXL_SPI1, &xSpiParams);
SPI 读取代码：
static int32_t prlSpiRead(void *handle,
uint8_t reg,
uint8_t *bufp,
uint16_t len)
{
int32_t lRetVal = 0;
SPI_Transaction xSpiTransaction = {0};
SPI_Handle xSpiHandle = *((SPI_Handle*) handle);
memset(xSpiTxBuff, 0xA5, 100);
memset(xSpiRxBuff, 0x00, 100);
GPIO_write(CC3220_LIS3MDL_SPI_CS_PIN, 0);
xSpiTxBuff[0] = (reg | 0xC0); //read + auto increment
xSpiTransaction.count = 1+len; // 1 command byte + number of expected bytes
xSpiTransaction.txBuf = (void*) xSpiTxBuff;
xSpiTransaction.rxBuf = (void*) xSpiRxBuff;
SPI_transfer(xSpiHandle, &xSpiTransaction);
GPIO_write(CC3220_LIS3MDL_SPI_CS_PIN, 1);
memcpy(bufp, &xSpiRxBuff[1], len);
if(SPI_TRANSFER_COMPLETED != xSpiTransaction.status)
{
lRetVal = -1;
}
return lRetVal;
}
