LAUNCHXL-CC1310: CC1310 串口配置参数readTimeout生效条件

genyi liu

Part Number: LAUNCHXL-CC1310

UART_Params_init(&params);
params.baudRate = 9600;
params.readMode = UART_MODE_CALLBACK;
params.writeMode = UART_MODE_CALLBACK;
params.readCallback = UART0_Read_Callback;
params.writeCallback = UART0_Write_Callback;
params.readTimeout = 1;
params.writeTimeout = 1;

readMode 设置为UART_MODE_CALLBACK时，readCallback 参数是否生效？

1 年多前

0 Alex Zhang 1 年多前

TI__Mastermind 18380 points

可以生效的，请参照uart的api函数说明。

Non-blocking and will return immediately. When UART_write() or UART_read() has finished, the callback function is called from either the caller's context or from an interrupt context.

我在这里为您提供了链接：

https://dev.ti.com/tirex/explore/content/simplelink_cc13x0_sdk_4_20_02_07/docs/tidrivers/doxygen/html/_u_a_r_t_8h.html#a5b0b54681a2ee6ed54e5b24f49324173ae6b6bd5d2d5df859ad6724e89e605ebf

请参照以上文档。

0 genyi liu 1 年多前回复 Alex Zhang

Intellectual 540 points

例如params.readTimeout = 1;是超时1ms还是1s ?

0 genyi liu 1 年多前回复 Alex Zhang

Intellectual 540 points

§ readTimeout

uint32_t UART_Params_::readTimeout

Timeout for read calls in blocking mode.

这不是说在阻塞时才生效吗？

0 Alex Zhang 1 年多前回复 genyi liu

TI__Mastermind 18380 points

genyi liu 说：
readMode 设置为UART_MODE_CALLBACK时

非阻塞并且会立即返回。当UART_write()或UART_read()完成时，将从调用者上下文或中断上下文中调用回调函数。

在启用中断的情况下从 UART 读取数据的函数。

UART_read() 从 UART 控制器读取数据。目的地由buffer指定，要读取的字节数由size给出。

在UART_MODE_BLOCKING中，UART_read() 会阻止任务执行，直到读取缓冲区中的所有数据。

在UART_MODE_CALLBACK中，UART_read() 不会阻止任务执行。相反，当传输完成时，将调用UART_Params::readCallback指定的回调函数。回调函数可以发生在调用者的上下文中或 HWI 或 SWI 上下文中，具体取决于设备特定的实现。在调用UART_close()之前，必须始终使用UART_readCancel()取消未完成的异步读取操作。

UART_read() 与UART_readPolling()互斥。对于打开的 UART 外设，可以使用UART_read() 或UART_readPolling() ，但不能同时使用两者。

警告
当处于UART_MODE_CALLBACK状态时，请勿从其自己的回调函数中调用 UART_read() 。

0 Alex Zhang 1 年多前回复 genyi liu

TI__Mastermind 18380 points

genyi liu 说：
例如params.readTimeout = 1;是超时1ms还是1s ?

1ms

0 Alex Zhang 1 年多前回复 Alex Zhang

TI__Mastermind 18380 points

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1071472/am5726-uart-driver-uart_write-call-never-returns-writemode-uart_mode_blocking-writetimeout-100?tisearch=e2e-sitesearch&keymatch=params.readTimeout#

https://e2e.ti.com/support/tools/code-composer-studio-group/ccs/f/code-composer-studio-forum/946369/ccs-lp-cc2652rb-how-to-receive-uart-input-into-a-variable/3499026?tisearch=e2e-sitesearch&keymatch=params.readTimeout#3499026

为您提供了两个链接，希望对您这边有一定的帮助。

另外因为都是使用uart，属于硬件侧。有个例程您这边可以参考这个是cc26x2sdk中demo中的我在下面附上了代码部分示例

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 */

/*
 *  ======== 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;

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

    numBytesRead = count;
    sem_post(&sem);
}

/*
 *  ======== mainThread ========
 */
void *mainThread(void *arg0)
{
    char input;
    const char echoPrompt[] = "Echoing characters:\r\n";
    UART2_Handle uart;
    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;

    uart = UART2_open(CONFIG_UART2_0, &uartParams);

    if (uart == NULL)
    {
        /* UART2_open() 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, 1, NULL);

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