0

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

德州仪器 开放MV
莫西 P7 P0
味噌 P6 P1
SLCK P5 P2
党卫军 P8 P3

两个设备之间的电线如上连接。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, 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);

以下声明不会被执行

        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);
4

0 回答 0