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以下是一個使用狀態(tài)機來處理STM32串口和按鍵同時使用的示例代碼，注釋已添加在代碼中：```c#include "stm32f4xx.h"// 定義狀態(tài)機的狀態(tài)typedef enum { STATE_IDLE, // 空閑狀態(tài) STATE_RECEIVING // 接收狀態(tài)} State;// 定義按鍵狀態(tài)typedef enum { BUTTON_RELEASED, // 按鍵釋放狀態(tài) BUTTON_PRESSED // 按鍵按下狀態(tài)} ButtonState;State currentState = STATE_IDLE; // 當前狀態(tài)ButtonState buttonState = BUTTON_RELEASED; // 按鍵狀態(tài)uint8_t receivedData;// 按鍵初始化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);}// 處理當前狀態(tài)void handleState(void) { switch (currentState) { case STATE_IDLE: // 空閑狀態(tài)，等待按鍵按下 if (buttonState == BUTTON_PRESSED) { currentState = STATE_RECEIVING; } break; case STATE_RECEIVING: // 接收狀態(tài)，等待接收到數(shù)據(jù) if (USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == SET) { receivedData = USART_ReceiveData(USART2); // 處理接收到的數(shù)據(jù) // ... currentState = STATE_IDLE; } break; }}int main(void) { buttonInit(); uartInit(); while (1) { // 讀取按鍵狀態(tài) if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) == RESET) { buttonState = BUTTON_PRESSED; } else { buttonState = BUTTON_RELEASED; } // 處理當前狀態(tài) handleState(); }}```希望這可以幫助你開始使用狀態(tài)機處理STM32串口和按鍵的操作。請注意，你可能需要根據(jù)你的具體應(yīng)用場景進行適當?shù)男薷暮驼{(diào)整。 |
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