[参考译文] CC2652R：如何触发 UART 读回？

我是偶然解决的。

修改了以下内容：

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 * Copyright (c) 2020, Texas Instruments Incorporated
 * All rights reserved.
 *
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 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
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 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 *  ======== uart2callback.c ========
 */
#include <stdint.h>
#include <stddef.h>

/* POSIX Header files */
#include <semaphore.h>

/* Driver Header files */
#include <ti/drivers/GPIO.h>
#include <ti/drivers/UART2.h>

/* Driver configuration */
#include "ti_drivers_config.h"

static sem_t sem;
static volatile size_t numBytesRead;

uint8_t input[100] = {0};
UART2_Handle uart;

/*
 *  ======== callbackFxn ========
 */
void callbackFxn(UART2_Handle handle, void *buffer, size_t count, void *userArg, int_fast16_t status)
{
    GPIO_toggle(CONFIG_GPIO_LED_0);
    if (status != UART2_STATUS_SUCCESS)
    {
        /* RX error occured in UART2_read() */
        while (1) {}
    }

    status = UART2_read(uart, input, sizeof(input), NULL);
            if (status != UART2_STATUS_SUCCESS)
            {
                /* UART2_read() failed */
                while (1) {}
            }

    numBytesRead = count;
    sem_post(&sem);
}

/*
 *  ======== mainThread ========
 */
void *mainThread(void *arg0)
{
    const char echoPrompt[] = "Echoing characters:\r\n";
    UART2_Params uartParams;
    int32_t semStatus;
    uint32_t status = UART2_STATUS_SUCCESS;

    /* Call driver init functions */
    GPIO_init();

    /* Configure the LED pin */
    GPIO_setConfig(CONFIG_GPIO_LED_0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);

    /* Create semaphore */
    semStatus = sem_init(&sem, 0, 0);

    if (semStatus != 0)
    {
        /* Error creating semaphore */
        while (1) {}
    }

    /* Create a UART in CALLBACK read mode */
    UART2_Params_init(&uartParams);
    uartParams.readMode     = UART2_Mode_CALLBACK;
    uartParams.readCallback = callbackFxn;
    uartParams.baudRate     = 115200;
    uartParams.readReturnMode = UART2_ReadReturnMode_PARTIAL;

    uart = UART2_open(CONFIG_UART2_0, &uartParams);

    if (uart == NULL)
    {
        /* UART2_open() failed */
        while (1) {}
    }

    status = UART2_read(uart, input, sizeof(input), NULL);

    if (status != UART2_STATUS_SUCCESS)
    {
                /* UART2_read() failed */
                while (1) {}
    }

    /* Turn on user LED to indicate successful initialization */
    GPIO_write(CONFIG_GPIO_LED_0, CONFIG_GPIO_LED_ON);

    /* Pass NULL for bytesWritten since it's not used in this example */
    UART2_write(uart, echoPrompt, sizeof(echoPrompt), NULL);



    /* Loop forever echoing */
    while (1)
    {
        numBytesRead = 0;

//        /* Pass NULL for bytesRead since it's not used in this example */
//        status = UART2_read(uart, &input, 1, NULL);
//
//        if (status != UART2_STATUS_SUCCESS)
//        {
//            /* UART2_read() failed */
//            while (1) {}
//        }

        /* Do not write until read callback executes */
        sem_wait(&sem);

        if (numBytesRead > 0)
        {
            status = UART2_write(uart, input, numBytesRead, NULL);

            if (status != UART2_STATUS_SUCCESS)
            {
                /* UART2_write() failed */
                while (1) {}
            }
        }
    }
}

您似乎必须首先调用 UART2_Read 才能进入 readCallback、这与 Nordic 的第一次回调和读取稍有不同。

您好！

您可以使用 SysConfig 定义两个 UART2实例。 两个 UART2实例都应使用 UART2驱动程序。

我希望这将有所帮助、

此致、