【ESP32】C语言映射表在嵌入式串口解析中的应用

本文主要是介绍【ESP32】C语言映射表在嵌入式串口解析中的应用，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

本文章主要以ESP32开发环境为例记录，C语言映射表在嵌入式串口解析中的应用

一、C语言映射表在串口数据解析中的应用

1、数据结构

typedef struct 
{char CMD[CMDLen];unsigned char (*cmd_operate)(char *data);
}Usart_Tab;

2、指令、函数映射表

static const Usart_Tab InstructionList[CMDMax]=
{{"PWON",PowOn},{"PWOFF",PowOff},
};

3、串口解析函数实现

/* 串口解析函数实现 */
unsigned char DataAnalysis(char *buf)
{unsigned char i,Result = 0;int NEXT=0;for(i=0;i<CMDMax;i++){NEXT=strcmp((char *)buf,(char*)InstructionList[i].CMD);if(NEXT==0){Result = (InstructionList[i].cmd_operate)(buf) ;break;}}return Result;
}

二、实验现象

三、实验代码

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "esp_log.h"
#include "driver/uart.h"
#include "string.h"
#include "driver/gpio.h"#include "ring_buffer.h"static const int RX_BUF_SIZE = 1024;#define TXD_PIN (GPIO_NUM_4)
#define RXD_PIN (GPIO_NUM_5)#define CMDMax 2
#define CMDLen 24static unsigned char PowOn(char *data);
static unsigned char PowOff(char *data);/* 数据结构定义 */
typedef struct 
{char CMD[CMDLen];unsigned char (*cmd_operate)(char *data);
}Usart_Tab;typedef unsigned char (*usartfuncp)(char *data);/* 指令、函数映射表 */
static const Usart_Tab InstructionList[CMDMax]=
{{"PWON",PowOn},{"PWOFF",PowOff},
};/* 串口解析函数实现 */
unsigned char DataAnalysis(char *buf)
{unsigned char i,Result = 0;int NEXT=0;for(i=0;i<CMDMax;i++){NEXT=strcmp((char *)buf,(char*)InstructionList[i].CMD);if(NEXT==0){Result = (InstructionList[i].cmd_operate)(buf) ;break;}}return Result;
}static unsigned char PowOn(char *data)
{printf("%s \r\n",data);return 0;
}static unsigned char PowOff(char *data)
{printf("%s \r\n",data);return 0;
}void uart_init(void) {const uart_config_t uart_config = {.baud_rate = 115200,.data_bits = UART_DATA_8_BITS,.parity = UART_PARITY_DISABLE,.stop_bits = UART_STOP_BITS_1,.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,.source_clk = UART_SCLK_APB,};// We won't use a buffer for sending data.uart_driver_install(UART_NUM_1, RX_BUF_SIZE * 2, 0, 0, NULL, 0);uart_param_config(UART_NUM_1, &uart_config);uart_set_pin(UART_NUM_1, TXD_PIN, RXD_PIN, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);static void rx_task(void *arg)
{static const char *RX_TASK_TAG = "RX_TASK";esp_log_level_set(RX_TASK_TAG, ESP_LOG_INFO);uint8_t* data = (uint8_t*) malloc(RX_BUF_SIZE+1);while (1) {const int rxBytes = uart_read_bytes(UART_NUM_1, data, RX_BUF_SIZE, 100 / portTICK_RATE_MS);if (rxBytes > 0) {data[rxBytes] = '\0';ESP_LOGI(RX_TASK_TAG, "Read %d bytes: '%s'", rxBytes, data);//ESP_LOG_BUFFER_HEXDUMP(RX_TASK_TAG, data, rxBytes, ESP_LOG_INFO);DataAnalysis((char *)data);//ring_buffer_writeArry(&ring_buffer,(const char*)data,rxBytes);}}free(data);
}void app_main(void)
{uart_init();ring_buffer_init(&ring_buffer, buf_arr, sizeof(buf_arr));xTaskCreate(rx_task, "uart_rx_task", 1024*2, NULL, configMAX_PRIORITIES, NULL);//xTaskCreate(tx_task, "uart_tx_task", 1024*2, NULL, configMAX_PRIORITIES-1, NULL);
}
}

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