int ResetTypeGet(void) { uint8_t rlt; rlt=0; if(RCC_GetFlagStatus(RCC_FLAG_PORRST)==1) { rlt|=1; } RCC_ClearFlag(); if(rlt==0) { return 1; } else { return 0; } }

这段代码是一个函数，名为ResetTypeGet。它的作用是获取系统复位的类型。函数首先定义了一个变量rlt，并将其初始化为0。然后，通过调用RCC_GetFlagStatus函数来检查RCC_FLAG_PORRST标志位是否被置位（值为1）。如果是，则将rlt的最低位设置为1。接着，通过调用RCC_ClearFlag函数来清除所有的复位标志位。最后，如果rlt等于0，则返回1；否则返回0。

总结起来，这段代码的功能是判断系统复位的类型，并返回相应的结果。

相关问题

修改以下程序，使其接收指令后发送一个hello,world字符串。#include "main.h"#include "usart.h"#include "gpio.h"#include "stdio.h"#include "string.h"uint8_t aRxBuffer;void SystemClock_Config(void);int fputc(int ch, FILE *f){ uint8_t temp[1] = {ch}; HAL_UART_Transmit(&huart1, temp, 1, 0xffff);return ch;}int fgetc(FILE * f){ uint8_t ch = 0; HAL_UART_Receive(&huart1,&ch, 1, 0xffff); return ch;}int main(void){ HAL_Init(); SystemClock_Config(); MX_GPIO_Init(); MX_USART1_UART_Init(); /* USER CODE BEGIN 2 */ HAL_UART_Receive_IT(&huart1, (uint8_t *)&aRxBuffer, 1); user_main_printf(""); /* USER CODE END 2 */ while (1) { }}void SystemClock_Config(void){ RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; 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_DIV2; RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL2; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } 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_0) != HAL_OK) { Error_Handler(); }}void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart){ char *pCmd = NULL; uint8_t len; switch(aRxBuffer){ case '1': pCmd = "command 1\r\n"; len = strlen(pCmd); break; case '2': pCmd = "command 2\r\n"; len = strlen(pCmd); break; case '3': pCmd = "command 3\r\n"; len = strlen(pCmd); break; case '4': pCmd = "command 4\r\n"; len = strlen(pCmd); break; default: pCmd = "command cmd\r\n"; len = strlen(pCmd); break; } HAL_UART_Transmit(&huart1, (uint8_t *)pCmd, len,0xFFFF); HAL_UART_Receive_IT(&huart1, (uint8_t *)&aRxBuffer, 1); }void Error_Handler(void){}#ifdef USE_FULL_ASSERTvoid assert_failed(uint8_t *file, uint32_t line){ }#endif

请修改程序如下：

#include "main.h"
#include "usart.h"
#include "gpio.h"
#include "stdio.h"
#include "string.h"

uint8_t aRxBuffer;

void SystemClock_Config(void);

int fputc(int ch, FILE *f) {
    uint8_t temp[1] = {ch};
    HAL_UART_Transmit(&huart1, temp, 1, 0xffff);
    return ch;
}

int fgetc(FILE * f) {
    uint8_t ch = 0;
    HAL_UART_Receive(&huart1,&ch, 1, 0xffff);
    return ch;
}

int main(void) {
    HAL_Init();
    SystemClock_Config();
    MX_GPIO_Init();
    MX_USART1_UART_Init();

    HAL_UART_Receive_IT(&huart1, (uint8_t *)&aRxBuffer, 1);

    while (1) {
        if (aRxBuffer != 0) {
            HAL_UART_Transmit(&huart1, "hello, world\r\n", 14, 0xFFFF);
            aRxBuffer = 0;
            HAL_UART_Receive_IT(&huart1, (uint8_t *)&aRxBuffer, 1);
        }
    }
}

void SystemClock_Config(void) {
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

    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_DIV2;
    RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL2;

    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
        Error_Handler();
    }

    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_0) != HAL_OK) {
        Error_Handler();
    }
}

void Error_Handler(void) {}

#ifdef  USE_FULL_ASSERT
void assert_failed(uint8_t *file, uint32_t line) {}
#endif

修改后的程序会在收到任何字符后发送 "hello, world" 字符串，然后再继续等待下一个字符。

int main(void) { char message[100]={0}; gpio_Init(); USART1_Init(); while(1) { // ??????? while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET); // ???? while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == SET) { message[i++] = USART_ReceiveData(USART1); } // ???????? if(strstr(message, "LIGHT ON") != NULL) { GPIO_SetBits(GPIOC, GPIO_Pin_13); } else if(strstr(message, "LIGHT OFF") != NULL) { GPIO_ResetBits(GPIOC, GPIO_Pin_13); } else if(strstr(message, "TEMPERATURE") != NULL) { // ?????? float temperature = 0; // TODO: ?????? // ?????? char str[50]; sprintf(str, "Temperature: %.2f", temperature); USART1_SendString((uint8_t*) str); } // ??1? delay(1000); }} void gpio_Init(void){ GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOC, &GPIO_InitStructure);} void USART1_Init(void) { USART_InitTypeDef USART_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); USART_InitStructure.USART_BaudRate = 115200; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_Init(USART1, &USART_InitStructure); USART_Cmd(USART1, ENABLE);} void USART1_SendByte(uint8_t byte) { while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET); USART_SendD解释每句代码的意思，在每句代码后面写出注释

代码注释如下：

#include "stm32f10x.h"

int main(void)
{
    char message[100] = {0};  // 定义存储接收到的消息的数组并初始化为0
    int i = 0;  // 定义计数器i并初始化为0
    gpio_Init();  // 初始化GPIO
    USART1_Init();  // 初始化USART1

    while (1)
    {
        while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);  // 等待接收数据
        while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == SET)  // 如果接收到数据
        {
            message[i++] = USART_ReceiveData(USART1);  // 将接收到的数据存储到message数组中
        }

        if (strstr(message, "LIGHT ON") != NULL)  // 如果接收到的消息中包含"LIGHT ON"
        {
            GPIO_SetBits(GPIOC, GPIO_Pin_13);  // 将PC13引脚输出高电平，点亮LED灯
        }
        else if (strstr(message, "LIGHT OFF") != NULL)  // 如果接收到的消息中包含"LIGHT OFF"
        {
            GPIO_ResetBits(GPIOC, GPIO_Pin_13);  // 将PC13引脚输出低电平，熄灭LED灯
        }
        else if (strstr(message, "TEMPERATURE") != NULL)  // 如果接收到的消息中包含"TEMPERATURE"
        {
            float temperature = 0;  // 定义温度并初始化为0
            // TODO: 获取温度值
            char str[50];  // 定义存储字符串的数组
            sprintf(str, "Temperature: %.2f", temperature);  // 将温度值存储到字符串中
            USART1_SendString((uint8_t*) str);  // 将字符串发送到串口
        }

        delay(1000);  // 延时1秒钟
    }
}

void gpio_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;  // 定义GPIO初始化结构体
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);  // 使能GPIOC时钟
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;  // 设置PC13引脚
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  // 设置为推挽输出
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  // 设置输出速率为50MHz
    GPIO_Init(GPIOC, &GPIO_InitStructure);  // 初始化GPIOC
}

void USART1_Init(void)
{
    USART_InitTypeDef USART_InitStructure;  // 定义USART初始化结构体
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);  // 使能USART1时钟
    USART_InitStructure.USART_BaudRate = 115200;  // 设置波特率为115200
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;  // 设置数据位长度为8位
    USART_InitStructure.USART_StopBits = USART_StopBits_1;  // 设置停止位为1位
    USART_InitStructure.USART_Parity = USART_Parity_No;  // 设置校验位为无校验
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;  // 设置硬件流控制为无
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;  // 设置USART为收发模式
    USART_Init(USART1, &USART_InitStructure);  // 初始化USART1
    USART_Cmd(USART1, ENABLE);  // 使能USART1
}

void USART1_SendByte(uint8_t byte)
{
    while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);  // 等待发送缓冲区为空
    USART_SendData(USART1, byte);  // 发送数据
}

void USART1_SendString(uint8_t* str)
{
    while (*str != '\0')  // 如果未到达字符串结尾
    {
        USART1_SendByte(*str);  // 发送当前字符
        str++;  // 指向下一个字符
    }
}

void delay(uint32_t time)
{
    while (time--);
}