HarmonyOS鸿蒙Next中ConvertToVoltage()函数报错

HarmonyOS鸿蒙Next中ConvertToVoltage()函数报错

请问是不是要导入函数ConvertToVoltage()的包？ConvertToVoltage()函数转换成电压值的公式是什么？

代码为:

#include <stdio.h>
#include "ohos_init.h"
#include "cmsis_os2.h"
#include "wifiiot_adc.h"
#include "wifiiot_errno.h"

#define GAS_SENSOR_CHAN_NAME WIFI_IOT_ADC_CHANNEL_5

static void EnvironmentTask(void *arg)
{
    (void) arg;
    unsigned short data;
    if(AdcRead(GAS_SENSOR_CHAN_NAME, &data, WIFI_IOT_ADC_EQU_MODEL_4 ,WIFI_IOT_ADC_CUR_BAIS_DEFAULT, 0) == WIFI_IOT_SUCCESS){
        printf("%d\n",data);
        float Vx = ConvertToVoltage((unsigned int)data);
        printf("%d\n",Vx);
        float gasSensorResistance = 5 / Vx-1;
        printf("%d\n",gasSensorResistance);
    }
}

static void EnvironmentDemo(void)
{
    osThreadAttr_t attr;

    attr.name = "EnvironmentTask";
    attr.attr_bits = 0U;
    attr.cb_mem = NULL;
    attr.cb_size = 0U;
    attr.stack_mem = NULL;
    attr.stack_size = 4096;
    attr.priority = osPriorityNormal;

    if (osThreadNew(EnvironmentTask , NULL ,&attr) == NULL){
        printf("[EnvironmentDemo] Falied to creat EnvironmentTask!\n");
    }
}

SYS_RUN(EnvironmentDemo);