STM32串口解析json命令（使用HAL库）
串口接收中断处理(0x0D 0x0A作为结尾)
串口接收没有采用环形缓冲区，使用0x0D 0x0A作为结尾（即回车换行符）。
uint8_t rxBuffer[128];
串口接收到的数据保存在rxBuffer数组中，
uint16_t count=0;
count表示串口接收数据的数量
bool bFlagOneFrame = false;
bFlagOneFrame一帧数据是否结束的标志
说明：在C99中直接使用bool定义，需要包含如下标准头文件
#include <stdbool.h>
说明：在C99中直接使用uint8_t等整形数据类型关键字定义，需要包含如下标准头文件
#include <stdint.h>
测试结果
具体代码
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2021 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include "cJSON.h"
#include "main.h"
#include "usart.h"
#include "gpio.h"
#include "cmd_queue.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
char *strJSON; //打包成功调用cJSON_Print打印输出
cJSON *objJson;
float f1;
char *json_string = "{\"SV\":60,\"KP\":5.0,\"KI\":100,\"KD\":300}";
uint8_t rxBuffer[128];
uint16_t count=0;
bool bFlagOneFrame = false;
/* USER CODE END PTD */
/**
* @brief This function handles USART1 global interrupt.
*/
uint8_t ucTemp;
void USART1_IRQHandler(void)
{
/* USER CODE BEGIN USART1_IRQn 0 */
/* USER CODE END USART1_IRQn 0 */
//HAL_UART_IRQHandler(&huart1); 不用官方中断处理库，效率太低
/* USER CODE BEGIN USART1_IRQn 1 */
if(__HAL_UART_GET_FLAG(&huart1, UART_FLAG_RXNE))
{
__HAL_UART_CLEAR_FLAG(&huart1, UART_FLAG_RXNE);
ucTemp = ( uint16_t)READ_REG(huart1.Instance->DR);
//queue_push(ucTemp); //将读取的数据添加到队列中
rxBuffer[count++] = ucTemp;
if(0x0A == ucTemp)
bFlagOneFrame = true;
}
/* USER CODE END USART1_IRQn 1 */
}
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
void test_cjson(void);
void cJsonQueParse(char *str);
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
queue_reset();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
//test_cjson();
// HAL_Delay(100);
if(true == bFlagOneFrame)
{
cJsonQueParse((char *)rxBuffer);
count = 0;
bFlagOneFrame = false;
//queue_reset();
}
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Initializes the CPU, AHB and APB busses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB busses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
void cJsonQueParse(char *str)
{
//cJSON* cjson = cJSON_Parse(json_string); //将JSON字符串转换成JSON结构体
cJSON* cjson = cJSON_Parse((const char *)str); //将JSON字符串转换成JSON结构体
if(cjson == NULL)
{
printf("cjson parse error...\r\n");
}
else
{
char *json_data = cJSON_PrintUnformatted(cjson); //JSON数据结构转换为JSON字符串
printf("%s\n",json_data);//输出字符串
printf("/*********************以下就是提取的数据**********************/\n");
double fSV = cJSON_GetObjectItem(cjson,"SV")->valuedouble; //解析浮点型
printf("SV: %.4f\n",fSV);
double fKP = cJSON_GetObjectItem(cjson,"KP")->valuedouble; //解析浮点型
printf("KP: %.4f\n",fKP);
double fKI = cJSON_GetObjectItem(cjson,"KI")->valuedouble; //解析浮点型
printf("KI: %.4f\n",fKI);
double fKD = cJSON_GetObjectItem(cjson,"KD")->valuedouble; //解析浮点型
printf("KD: %.4f\n",fKD);
//释放内存
free(json_data);
cJSON_Delete(cjson); //清楚结构体
}
}
/* USER CODE BEGIN 4 */
void test_cjson(void)
{
double grade[4]= {66.51,118.52,61.53,128.54};
int time[4]= {123,456,789,150};
cJSON *measurements = cJSON_CreateObject(); //创建一个对象
cJSON_AddStringToObject(measurements,"AAA","26.55666"); //添加字符串
cJSON_AddNumberToObject(measurements,"BBB",13); //添加整型数字
cJSON_AddNumberToObject(measurements,"CCC",13.55666); //添加浮点型数字
cJSON_AddFalseToObject(measurements,"gender"); //添加逻辑值false
cJSON_AddStringToObject(measurements,"status","0x8000"); //添加字符串
cJSON *item1 = cJSON_CreateObject(); //创建一个对象
cJSON_AddStringToObject(item1,"item1_string","China"); //添加字符串
cJSON_AddNumberToObject(item1,"item1_num",2021); //添加整型数字
cJSON_AddItemToObject(measurements,"item1",item1);
objJson = cJSON_GetObjectItem(measurements, "AAA");
f1 = strtod(objJson->valuestring, NULL);
char *json_data = cJSON_PrintUnformatted(measurements); //JSON数据结构转换为JSON字符串
printf("%s\n",json_data);//输出字符串
free(json_data);
cJSON_Delete(measurements);//清除结构体
}
/* USER CODE END 4 */
int fputc(int ch,FILE *f)
{
uint8_t temp[1]= {ch};
HAL_UART_Transmit(&huart1,temp,1,2); //UartHandle是串口的句柄
}
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
/* USER CODE END Error_Handler_Debug */
}
#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 CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/