[参考译文] CC3220SF：来自 OpenMV 的 SPI、不会调用回调函数

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https://e2e.ti.com/support/wireless-connectivity/wi-fi-group/wifi/f/wi-fi-forum/996191/cc3220sf-spi-from-openmv-callback-function-does-not-get-called

器件型号：CC3220SF

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

	TI	OpenMV
MOSI	P7.	P0
MISO	六	P1
SCLK	P5	P2
SS	P8.	P3.

两个器件之间的导线如上所示进行连接(包括接地引脚)。 OpenMV microPython 代码很简单。代码片段为：

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：

名称：CONFIG_SPI_SLAVE

模式：四引脚低电平有效

SS 控制：HW

SCLK 引脚：P05/7

MISO 引脚：P06/14

MISO 引脚：P07/15

SS 引脚：P08/18

我面临的挑战是、不调用 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：

    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);

下面的语句不会执行

    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 年多前