cap/zx297520v3/src/lynq/lib/liblynq-adc/lynq-adc.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sc_bsp.h>
#include <errno.h>
#include "lynq-adc.h"
#include "liblog/lynq_deflog.h"

#ifdef __cplusplus
extern "C" {
#endif

#define ADC0_NODES "/sys/kernel/debug/pmu_zx29/adc0"
#define ADC1_NODES "/sys/kernel/debug/pmu_zx29/adc1"
#define ADC2_NODES "/sys/kernel/debug/pmu_zx29/adc2"

/********************************************************************
* @brief: qser_adc_show, function to read ADC value from specific channel
* @param qadc [IN]: ADC_CHANNEL_E, the ADC channel to read from
* @return : int, the read ADC value, or error code if failed
* @todo: NA
* @see: NA
* @warning: NA
*********************************************************************/
int qser_adc_show(ADC_CHANNEL_E qadc)
{
    int adc_value;
    char cmd[1024];
    char cmd_ret[1024];
    FILE *fp;
    switch(qadc)
    {
    case QADC_NONE:
    {
        LYERRLOG("function %s line %d\n", __FUNCTION__, __LINE__);
        return 0;
    }
    case ADC0:
    {
        LYDBGLOG("function %s line %d\n", __FUNCTION__, __LINE__);
        sprintf(cmd, "cat %s", ADC0_NODES);
        break;
    }
    case ADC1:
    {
        LYDBGLOG("function %s line %d\n", __FUNCTION__, __LINE__);
        sprintf(cmd, "cat %s", ADC1_NODES);
        break;
    }
    case ADC2:
    {
        LYDBGLOG("function %s line %d\n", __FUNCTION__, __LINE__);
        sprintf(cmd, "cat %s", ADC2_NODES);
        break;
    }
    default:
    {
        LYERRLOG("input error\n");
        return -1;
    }
    }
    if((fp = popen(cmd,"r")) == NULL)
    {
        LYERRLOG("popen error: %s", strerror(errno));
        return -1;
    }
    if((fread(cmd_ret,sizeof(cmd_ret),1,fp))<0)
    {
        LYERRLOG("fread fail: %s", strerror(errno));
        fclose(fp);
        return -1;
    }
    fclose(fp);
    adc_value = atoi(cmd_ret);
    if (adc_value < 0 || adc_value > 12000)
    {
        LYERRLOG("bad adc value %s!", cmd_ret);
        return -1;
    }
    return adc_value;
}

DEFINE_LYNQ_LIB_LOG(LYNQ_ADC)

#ifdef __cplusplus
}
#endif