笔者这里参考 Demo netconn_client_rtos_stm32l496g_discovery，简单的写了个应用。就简简单单的在加入 AP 后与指定的 TCP Server 建立连接，之后发送一个 GET 请求。main.c 如下：
/**
******************************************************************************
* @file Project/STM32F10x_StdPeriph_Template/main.c
* @author MCD Application Team
* @version V3.6.0
* @date 20-September-2021
* @brief Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2011 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include <stdio.h>
#include "stm32f10x.h"
#include "lwesp_opts.h"
#include "FreeRTOS.h"
#include "task.h"
#include "printf.h"
#include "delay.h"
#include "lwesp/lwesp.h"
#include "station_manager.h"
#include "netconn_client.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
lwespr_t lwesp_callback_func(lwesp_evt_t* evt) {
switch (lwesp_evt_get_type(evt)) {
case LWESP_EVT_AT_VERSION_NOT_SUPPORTED: {
lwesp_sw_version_t v_min, v_curr;
lwesp_get_min_at_fw_version(&v_min);
lwesp_get_current_at_fw_version(&v_curr);
printf("Current ESP8266 AT version is not supported by library!\r\n");
printf("Minimum required AT version is: %d.%d.%d\r\n", (int)v_min.major, (int)v_min.minor, (int)v_min.patch);
printf("Current AT version is: %d.%d.%d\r\n", (int)v_curr.major, (int)v_curr.minor, (int)v_curr.patch);
break;
}
case LWESP_EVT_INIT_FINISH: {
printf("Library initialized!\r\n");
break;
}
case LWESP_EVT_RESET_DETECTED: {
printf("Device reset detected!\r\n");
break;
}
case LWESP_EVT_WIFI_IP_ACQUIRED: { /* We have IP address and we are fully ready to work */
if (lwesp_sta_is_joined()) { /* Check if joined on any network */
lwesp_sys_thread_create(NULL, "netconn_client", (lwesp_sys_thread_fn)netconn_client_thread, NULL, 512, LWESP_SYS_THREAD_PRIO);
}
break;
}
case LWESP_EVT_WIFI_CONNECTED: {
printf("Successfully joined AP\r\n");
break;
}
default:
break;
}
return lwespOK;
}
void join_ap_test(void *pvParameters)
{
/* Initialize ESP with default callback function */
printf("Initializing LwESP\r\n");
if (lwesp_init(lwesp_callback_func, 1) != lwespOK) {
printf("Cannot initialize LwESP!\r\n");
} else {
printf("LwESP initialized!\r\n");
}
/*
* Continuously try to connect to WIFI network
* but only in case device is not already connected
*/
while (1) {
if (!lwesp_sta_is_joined()) {
/*
* Connect to access point.
*
* Try unlimited time until access point accepts up.
* Check for station_manager.c to define preferred access points ESP should connect to
*/
connect_to_preferred_access_point(1);
}
vTaskDelay(1000);
}
vTaskDelete(NULL);
}
/**
* @brief Configures the nested vectored interrupt controller.
* @param None
* @retval None
*/
void NVIC_Configuration(void)
{
/* Configure the NVIC Preemption Priority Bits */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
}
/**
* @brief Main program.
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f10x_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f10x.c file
*/
/* Add your application code here
*/
BaseType_t xReturn = pdPASS;
NVIC_Configuration();
debug_uart_init();
printf("Debug UART output success\r\n");
xReturn = xTaskCreate(join_ap_test, "join_ap_test", 1024 * 2, NULL, 1, NULL);
if(pdPASS == xReturn)
vTaskStartScheduler();
else
return -1;
/* Infinite loop */
while (1);
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
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