[参考译文] UART2_writeCancel ()/UART2_CLOSE ()在外设断开连接时挂起

尊敬的 Andreas：

让我来看看、今天晚些时候我会回来给您。

此致、

Arthur

尊敬的 Andreas：

您使用的超时值是多少？ 使用以下代码时似乎无法重现此问题：

/*
 * Copyright (c) 2020, Texas Instruments Incorporated
 * All rights reserved.
 *
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 * modification, are permitted provided that the following conditions
 * are met:
 *
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 *    notice, this list of conditions and the following disclaimer.
 *
 * *  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,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 *  ======== uart2echo.c ========
 */
#include <stdint.h>
#include <stddef.h>

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

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

/*
 *  ======== mainThread ========
 */
void *mainThread(void *arg0)
{
    char input;
    const char sixBytes1[6] = "Hello";
    const char sixBytes2[6] = " you!";
    UART2_Handle uart;
    UART2_Params uartParams;
    size_t bytesRead;
    size_t bytesWritten = 0;
    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);

    UART2_Params_init(&uartParams);
    uartParams.baudRate = 115200;
    uartParams.writeMode = UART2_Mode_BLOCKING;

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

    /* Loop forever echoing */
    while (1)
    {
        uart = UART2_open(CONFIG_UART2_0, &uartParams);

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

        status = UART2_writeTimeout(uart, sixBytes1, 6, &bytesWritten, 1000);

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

        #if 1
        status = UART2_writeTimeout(uart, sixBytes2, 6, &bytesWritten, 1000);

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

        UART2_writeCancel(uart);
        #endif
        

        UART2_close(uart);
        sleep(1);
    }
}

可以看到、我使用1000超时、UART 配置为在115200波特下运行。

我现在将尝试使用硬件流控制引脚(RTS、CTS)。

此致、

Arthur

尊敬的 Andreas：

没有必要,我设法重现的行为。 停止 RX 器件、可以达到与您相同的目的：

我将进一步研究这一点。  

此致、

Arthur

尊敬的 Andreas：

顺便说一下、您是否已经制定了解决方案？ 请告诉我、然后我可以尝试找到一个

此致、

Arthur

您好、

没有。  在我们的应用中不应该出现这种情况(在本例中为外设断开连接)、我们也没有在现场遇到过这种情况、因此我没有优先考虑。 因此、无需匆忙寻找权变措施、但在某个时候关闭这个临界情况会很好。

Andreas