linux内核串口设备驱动程序

# 检查设备文件是否存在
ls -l /dev/ttyS*

# 检查权限
sudo chmod 666 /dev/ttyS*

# 检查硬件连接
dmesg | grep ttyS*

// 设置波特率
struct termios options;
tcgetattr(fd, &options);
cfsetispeed(&options, B9600);
cfsetospeed(&options, B9600);
tcsetattr(fd, TCSANOW, &options);

// 设置数据格式
options.c_cflag &= ~PARENB; // 无校验
options.c_cflag &= ~CSTOPB; // 1个停止位
options.c_cflag &= ~CSIZE;
options.c_cflag |= CS8; // 8个数据位

// 示例ISR
irqreturn_t my_isr(int irq, void *dev_id) {
    // 处理中断逻辑
    return IRQ_HANDLED;
}

// 注册ISR
int result = request_irq(irq_number, my_isr, IRQF_SHARED, "my_serial_irq", NULL);
if (result) {
    printk(KERN_ERR "Failed to register IRQ\n");
}

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>

int main() {
    int fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1) {
        perror("open_port: Unable to open /dev/ttyS0");
        return -1;
    }

    struct termios options;
    tcgetattr(fd, &options);
    cfsetispeed(&options, B9600);
    cfsetospeed(&options, B9600);
    options.c_cflag |= (CLOCAL | CREAD);
    options.c_cflag &= ~PARENB;
    options.c_cflag &= ~CSTOPB;
    options.c_cflag &= ~CSIZE;
    options.c_cflag |= CS8;
    tcsetattr(fd, TCSANOW, &options);

    char buf[255];
    while (1) {
        int n = read(fd, buf, sizeof(buf));
        if (n > 0) {
            buf[n] = '\0';
            printf("%s", buf);
        }
    }

    close(fd);
    return 0;
}