单片机系统时间控制与通信协议实现

以下是一个简单的实现，仅供参考：

/* 通信协议部分 */ #define START_CODE 0xAA #define END_CODE 0x55

typedef struct { uint8_t start_code; uint8_t address_code; uint8_t control_code; uint8_t data; uint8_t checksum; uint8_t end_code; } message_t;

/* 时间控制命令 */ #define CMD_PAUSE 0x01 #define CMD_RESET 0x02 #define CMD_RESTART 0x03 #define CMD_QUERY_TIME 0x04 #define CMD_SET_TIME 0x05

/* 下位机地址 */ #define ADDR_ALL 0xFF #define ADDR_MACHINE_1 0x01 #define ADDR_MACHINE_2 0x02 // ...

/* 通信函数 */ void send_message(uint8_t addr, uint8_t ctrl, uint8_t data) { message_t msg = {0}; msg.start_code = START_CODE; msg.address_code = addr; msg.control_code = ctrl; msg.data = data; msg.checksum = ...; // 校验码的计算方法自行实现 msg.end_code = END_CODE; // 发送消息 }

/* 主函数 */ int main() { // 尝试接收消息 message_t msg = {0}; while (receive_message(&msg)) { // 判断地址码，如果是本机则处理命令 if (msg.address_code == ADDR_THIS) { switch (msg.control_code) { case CMD_PAUSE: pause_time(); break; case CMD_RESET: reset_time(); break; case CMD_RESTART: restart_time(); break; case CMD_QUERY_TIME: send_message(ADDR_THIS, CMD_QUERY_TIME, get_time()); break; case CMD_SET_TIME: set_time(msg.data); break; default: break; } } // 如果是广播命令，则所有下位机都执行相应操作 else if (msg.address_code == ADDR_ALL) { switch (msg.control_code) { case CMD_PAUSE: pause_time(); break; case CMD_RESET: reset_time(); break; case CMD_RESTART: restart_time(); break; case CMD_QUERY_TIME: send_message(ADDR_THIS, CMD_QUERY_TIME, get_time()); break; case CMD_SET_TIME: set_time(msg.data); break; default: break; } } // 如果是单播命令，则只有对应下位机执行相应操作 else { if (msg.address_code == ADDR_MACHINE_1) { // 发送命令给下位机1 send_message(ADDR_MACHINE_1, msg.control_code, msg.data); } else if (msg.address_code == ADDR_MACHINE_2) { // 发送命令给下位机2 send_message(ADDR_MACHINE_2, msg.control_code, msg.data); } // ... } } return 0; }