OpenMV 和 CC3220SX SPI 集成

问题描述

我正在尝试在 OpenMV（主）和 TI CC3220（从）之间进行串行通信。引脚分配是

	TI	OpenMV
MOSI	P7	P0
味噌	P6	P1
SLCK	P5	P2
SS	P8	P3

两个设备之间的电线连接如上。 OpenMV microPython 代码很简单。代码片段是：

    cs  = Pin("P3",Pin.OUT_OD)
    #The code below gets executed in a loop. I have removed other parts of logic
           spi = SPI(2,SPI.MASTER,baudrate=115200,polarity=0,phase=1)
           cs.low()
           spi.send(b'5') #Hardcoded to 5 for the testing
           cs.high()

SPI 的配置设置为：

Name: CONfig_SPI_SLAVE
Mode: Four Pin Active Low
SS Control: HW
SCLK Pin: P05/7
MISO Pin: P06/14
MISO Pin: P07/15
SS Pin: P08/18

我遇到的挑战是没有调用 TI 的回调函数。

    void transferCompleteFxn(SPI_Handle handle,SPI_Transaction *transaction)
    {
        LOG_INFO("In transfer complete \r\n");
        sem_post(&slaveSem);
    }

代码如下：

       status = sem_init(&slaveSem,0);
        if (status != 0) {
            while(1);
        }
        LOG_INFO("Sem init done\r\n");
    
        SPI_Params_init(&spiParams);
        spiParams.bitRate     = 115200;
        spiParams.frameFormat = SPI_POL0_PHA1;
        spiParams.mode = SPI_SLAVE;
        spiParams.transferCallbackFxn = transferCompleteFxn;
        spiParams.transferMode = SPI_MODE_CALLBACK;
        slaveSpi = SPI_open(CONfig_SPI_SLAVE,&spiParams);
    
        if (slaveSpi == NULL) {
            LOG_INFO("Error initializing slave SPI\r\n");
            while (1);
        }
        else {
            LOG_INFO("Slave SPI initialized\r\n");
        }
    
        /* copy message to transmit buffer */
        strncpy((char *) slaveTxBuffer,SLAVE_MSG,SPI_MSG_LENGTH);
    
        for (i = 0; i < MAX_LOOP; i++) {
            /* Initialize slave SPI transaction structure */
            transaction.count = SPI_MSG_LENGTH;
            transaction.txBuf = NULL;
            transaction.rxBuf = (void *) slaveRxBuffer;
    
            /* Toggle on user LED,indicating a SPI transfer is in progress */
            GPIO_toggle(CONfig_GPIO_LED_1);
    
            transferOK = SPI_transfer(slaveSpi,&transaction);
            if (transferOK) {
    
                GPIO_write(CONfig_SPI_SLAVE_READY,0);
    
                LOG_INFO("GPIo write done\r\n");
    
                /* Wait until transfer has completed */
                sem_wait(&slaveSem);

以下声明未执行

        LOG_INFO("SEM wait done\r\n");

        /*
         * Drive CONfig_SPI_SLAVE_READY high to indicate slave is not ready
         * for another transfer yet.
         */
        LOG_INFO("Slave received\r\n");
    }
    else {
        LOG_INFO("Unsuccessful slave SPI transfer\r\n");
    }
}

SPI_close(slaveSpi);

解决方法

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