94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <termios.h>
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#include <sys/time.h>
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#define SERIAL_PORT "/dev/ttyS0" // 根据你的设备修改串口设备文件路径
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int main() {
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int serial_fd;
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struct termios options;
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char *port = SERIAL_PORT;
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char readbuffer[256];
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fd_set readfds;
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struct timeval timeout;
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// 打开串口
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serial_fd = open(port, O_RDWR | O_NOCTTY | O_NDELAY);
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if (serial_fd == -1) {
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perror("open_port: Unable to open device");
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return -1;
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}
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// 获取当前串口设置
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tcgetattr(serial_fd, &options);
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// 设置波特率
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cfsetispeed(&options, B9600);
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cfsetospeed(&options, B9600);
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// 设置串口参数：8位数据位，1位停止位，无奇偶校验位
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options.c_cflag &= ~PARENB; // Clear parity bit, no parity
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options.c_cflag &= ~CSTOPB; // Clear stop field, only one stop bit used in communication
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options.c_cflag &= ~CSIZE; // Clear all the size bits
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options.c_cflag |= CS8; // 8 data bits
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options.c_cflag &= ~CRTSCTS; // Disable RTS/CTS hardware flow control
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options.c_lflag &= ~ICANON;
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options.c_lflag &= ~ECHO; // Disable echo
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options.c_lflag &= ~ECHOE; // Disable erasure
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options.c_lflag &= ~ECHONL; // Disable new-line echo
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options.c_lflag &= ~ISIG; // Disable interpretation of INTR, QUIT and SUSP
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options.c_iflag &= ~(IXON | IXOFF | IXANY); // Turn off s/w flow ctrl
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options.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR); // Disable special handling of received bytes
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// 设置输入输出的VMIN和VTIME
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options.c_cc[VMIN] = 0;
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options.c_cc[VTIME] = 5;
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// 应用串口参数
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tcsetattr(serial_fd, TCSANOW, &options);
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printf("Configuring the serial port completed\n");
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// 发送数据
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char *msg = "Hello, Serial Port!\n";
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write(serial_fd, msg, strlen(msg));
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// 使用select等待数据
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while (1) {
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FD_ZERO(&readfds);
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FD_SET(serial_fd, &readfds);
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// 设置超时时间
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timeout.tv_sec = 5; // 5 seconds
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timeout.tv_usec = 0;
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// 等待串口数据，超时返回
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int ret = select(serial_fd + 1, &readfds, NULL, NULL, &timeout);
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if (ret == -1) {
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perror("select error");
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break;
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} else if (ret == 0) {
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printf("select timeout\n");
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continue;
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} else {
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if (FD_ISSET(serial_fd, &readfds)) {
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memset(readbuffer, 0, sizeof(readbuffer));
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int n = read(serial_fd, readbuffer, sizeof(readbuffer));
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if (n > 0) {
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printf("Data Received: %s", readbuffer);
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}
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}
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}
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}
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// 关闭串口
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close(serial_fd);
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return 0;
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}
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