pwmtest2.c

来自「周立功magic2200实验箱linux增补例子。包括（GPIO zlg7290」· C语言 代码 · 共 34 行

#include "config.h"

int main()
{
    int fd;
    uint32 val;
    
    fd = open("/dev/PWM", O_RDONLY);
    if(fd == -1)
    {
        printf("\nCan't open PWM!\n");
        return -1;
    }
    
    
    printf("\nInput number(1~10) to chage duty(PWM2).\n");

    while(1)
    {
        scanf("%d", &val);
        if(val > 10)
            val = 0;

        ioctl(fd, PWM_SET_CYC, Fpclk / 1000);
        ioctl(fd, PWM_2_SET_DUTY, Fpclk /(1000+100*val));
        ioctl(fd, PWM_2_ENABLE, 0);
    }

    close(fd);
    
    return 0;
}