写一个r3013mg串口读取二维码stm32源码
时间: 2024-03-24 12:37:30 浏览: 39
以下是一个基于 STM32 的 R3013MG 模块串口读取二维码的源码示例:
```c
#include "stm32f4xx_hal.h"
#include <string.h>
#include <stdlib.h>
#define MAX_BUFFER_SIZE 1024
UART_HandleTypeDef huart2;
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
int main(void) {
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART2_UART_Init();
// 发送读取二维码指令
char cmd[] = {0x55, 0x04, 0x02, 0x00, 0x01, 0x10};
HAL_UART_Transmit(&huart2, (uint8_t*)cmd, sizeof(cmd), 1000);
// 读取返回数据
char buffer[MAX_BUFFER_SIZE];
int len = HAL_UART_Receive(&huart2, (uint8_t*)buffer, MAX_BUFFER_SIZE, 1000);
// 解析二维码
if (len > 0) {
if (buffer[0] == 0x55 && buffer[2] == 0x01) {
int length = buffer[3] * 256 + buffer[4];
char *data = (char*)malloc(length);
memcpy(data, buffer + 5, length);
printf("读取到二维码:%s\n", data);
free(data);
} else {
printf("未读取到二维码\n");
}
} else {
printf("读取失败\n");
}
while (1);
}
void SystemClock_Config(void) {
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
__HAL_RCC_PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/** Initializes the CPU, AHB and APB busses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
RCC_OscInitStruct.PLL.PLLM = 8;
RCC_OscInitStruct.PLL.PLLN = 168;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 4;
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_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) {
Error_Handler();
}
}
static void MX_USART2_UART_Init(void) {
huart2.Instance = USART2;
huart2.Init.BaudRate = 9600;
huart2.Init.WordLength = UART_WORDLENGTH_8B;
huart2.Init.StopBits = UART_STOPBITS_1;
huart2.Init.Parity = UART_PARITY_NONE;
huart2.Init.Mode = UART_MODE_TX_RX;
huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart2.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart2) != HAL_OK) {
Error_Handler();
}
}
static void MX_GPIO_Init(void) {
__HAL_RCC_GPIOA_CLK_ENABLE();
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
void Error_Handler(void) {
__disable_irq();
while (1);
}
```
这段代码假定你已经连接了 R3013MG 模块到 STM32 的 UART2 上(PA2 为 TX,PA3 为 RX)。它通过发送读取二维码的指令,然后读取返回的数据并解析其中的二维码数据。如果成功读到二维码,则会输出二维码的内容。
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