以下是一个使用状态机来处理STM32串口和按键同时使用的示例代码,注释已添加在代码中:```c#include "stm32f4xx.h"// 定义状态机的状态typedef enum { STATE_IDLE, // 空闲状态 STATE_RECEIVING // 接收状态} State;// 定义按键状态typedef enum { BUTTON_RELEASED, // 按键释放状态 BUTTON_PRESSED // 按键按下状态} ButtonState;State currentState = STATE_IDLE; // 当前状态ButtonState buttonState = BUTTON_RELEASED; // 按键状态uint8_t receivedData;// 按键初始化void buttonInit(void) { RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); GPIO_InitTypeDef GPIO_InitStruct; GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOA, &GPIO_InitStruct);}// 串口初始化void uartInit(void) { RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2); GPIO_InitTypeDef GPIO_InitStruct; GPIO_InitStruct.GPIO_Pin = GPIO_Pin_2; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStruct); USART_InitTypeDef USART_InitStruct; USART_InitStruct.USART_BaudRate = 9600; USART_InitStruct.USART_WordLength = USART_WordLength_8b; USART_InitStruct.USART_StopBits = USART_StopBits_1; USART_InitStruct.USART_Parity = USART_Parity_No; USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStruct.USART_Mode = USART_Mode_Rx; USART_Init(USART2, &USART_InitStruct); USART_Cmd(USART2, ENABLE);}// 处理当前状态void handleState(void) { switch (currentState) { case STATE_IDLE: // 空闲状态,等待按键按下 if (buttonState == BUTTON_PRESSED) { currentState = STATE_RECEIVING; } break; case STATE_RECEIVING: // 接收状态,等待接收到数据 if (USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == SET) { receivedData = USART_ReceiveData(USART2); // 处理接收到的数据 // ... currentState = STATE_IDLE; } break; }}int main(void) { buttonInit(); uartInit(); while (1) { // 读取按键状态 if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) == RESET) { buttonState = BUTTON_PRESSED; } else { buttonState = BUTTON_RELEASED; } // 处理当前状态 handleState(); }}```希望这可以帮助你开始使用状态机处理STM32串口和按键的操作。请注意,你可能需要根据你的具体应用场景进行适当的修改和调整。 |