5 at client连接esp8266超时问题（野火指南者开发板)

发布于 2022-03-08 17:49:12 浏览：2754 订阅该版

[tocm]

## 1.输出结果

```c
 \ | /
- RT -     Thread Operating System
 / | \     4.0.3 build Mar  8 2022
 2006 - 2020 Copyright by rt-thread team
[32m[I/sal.skt] Socket Abstraction Layer initialize success.[0m
[32m[I/at.clnt] AT client(V1.3.1) on device uart3 initialize success.[0m
[0m[D/main] Hello RT-Thread![0m
msh />[0m[D/main] Hello RT-Thread![0m
[0m[D/main] Hello RT-Thread![0m
[0m[D/main] Hello RT-Thread![0m
[0m[D/main] Hello RT-Thread![0m
[0m[D/main] Hello RT-Thread![0m
[31m[E/at.clnt] wait AT client(uart3) connect timeout(5000 tick).[0m
```

## 2.部分代码
### 2.1.串口配置
```c
#define BSP_USING_UART1
#define BSP_UART1_TX_PIN       "PA9"
#define BSP_UART1_RX_PIN       "PA10"

#define BSP_USING_UART3
#define BSP_UART3_TX_PIN       "PB10"
#define BSP_UART3_RX_PIN       "PB11"
```

### 2.2.esp8266引脚配置
```c
extern void esp8266_gpio_config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.Pull     = GPIO_PIN_8 | GPIO_PIN_9;
    GPIO_InitStructure.Mode     = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStructure.Speed    = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);

HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_SET);
}
```

### 2.3.例程代码
```c
#define ESP8266_SAMPLE_DEIVCE_NAME     "esp0"

static struct at_device_esp8266 esp0 =
{
    ESP8266_SAMPLE_DEIVCE_NAME,
    ESP8266_SAMPLE_CLIENT_NAME,

ESP8266_SAMPLE_WIFI_SSID,
    ESP8266_SAMPLE_WIFI_PASSWORD,
    ESP8266_SAMPLE_RECV_BUFF_LEN,
};

static int esp8266_device_register(void)
{
    struct at_device_esp8266 *esp8266 = &esp0;

return at_device_register(&(esp8266->device),
                              esp8266->device_name,
                              esp8266->client_name,
                              AT_DEVICE_CLASS_ESP8266,
                              (void *) esp8266);
}
INIT_APP_EXPORT(esp8266_device_register);
```

小小李sunny 2022-03-08

这家伙很懒，什么也没写！

火灵芝a 打赏了 5.00 元 2022-03-09 10:32:50

火灵芝a 2022-03-08

这家伙很懒，什么也没写！

小小李sunny 2022-03-08

这家伙很懒，什么也没写！

火灵芝a 2022-03-08

这家伙很懒，什么也没写！

小小李sunny 2022-03-08

这家伙很懒，什么也没写！

火灵芝a 2022-03-09

这家伙很懒，什么也没写！

@小小李sunny 
## 1.增加esp8266(PB8初始化并设置为高电平）使能
```c
extern void esp8266_gpio_config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

//HAL_GPIO_WritePin(GPIOB, GPIO_PIN_9, GPIO_PIN_SET);
    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_SET);
}
```c
![image.png](https://oss-club.rt-thread.org/uploads/20220309/f2a4d2cf5a3409c820dacf9f1ad8dd38.png)

现象：
    LED亮蓝灯（这是我不能理解的，并没有初始化LED相关引脚，PB0, PB1, PB5)
    串口缓冲区不足
    与esp8266通讯仍然超时，
## 2.增加esp8266复位初始化并设置高电平引脚
```c
extern void esp8266_gpio_config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

HAL_GPIO_WritePin(GPIOB, GPIO_PIN_9, GPIO_PIN_SET);    /* ----这一句取消注释了-----*/
    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_SET);
}
```c
    现象：
    仍然LED亮蓝灯
    仍然与esp8266通讯超时，
    但是串口缓冲区不在溢出
    
## 3.检测电平
```c
    int bitread = 0;

bitread = HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_8);
    if(bitread == 0)
    {
        rt_kprintf("GPIOB GPIO_PIN_8 is low!\n");
    }
    bitread = 0;

bitread = HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_9);
    if(bitread == 0)
    {
        rt_kprintf("GPIOB GPIO_PIN_9 is low!\n");
    }
    bitread = 0;

bitread = HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0);
    bitread = HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1);
    bitread = HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_5);
    if(bitread == 0)
    {
        rt_kprintf("LED GPIO is low!");
    }
    bitread = 0;
```c
    现象：
    仅仅只有PB8引脚（即esp8266使能引脚是低电平）-我不理解
![image.png](https://oss-club.rt-thread.org/uploads/20220309/40e5703b761447487bded98103260693.png)