adctest2.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 53 行

#include "config.h"

int main()
{
    int fd1,fd2;
    volatile uint16 ad_data;
    uint32 volt;
    uint32 fadc = 4500000;
 
    fd1 = open("/dev/ADC0.0",O_RDONLY);
    if(fd1 == -1)
    {
        printf("\nCan't open ADC0.0!\n");
        exit(-1);
    }

    fd2 = open("/dev/ADC0.1", O_RDONLY);
    if(fd2 == -1)
    {
        printf("\nCan't open ADC0.1!\n");
        exit(-1);
    }


    ioctl(fd1, ADC_SET_CLKDIV, (Fpclk + fadc - 1) / fadc);
    ioctl(fd1, ADC_SET_BITS, 10);

    while(1)
    {
        ad_data = 0;
        read(fd1, &ad_data, sizeof(ad_data));
        volt = (3300*(ad_data>>6));
        volt = volt/1024; 
        printf("VIN1's voltage is: %d mV        ", volt);
        sleep(1);
    
        ad_data = 0;
        read(fd2, &ad_data, sizeof(ad_data));
        volt = (3300*(ad_data>>6));
        volt = volt/1024; 
        printf("VIN2's voltage is: %d mV\n", volt);
        sleep(1);
    }

    return 0;
}

/*********************************************************************************************************
**                            End Of File
********************************************************************************************************/