stm8L151 单片机自身供电电压检测 电量剩余百分比检测

#include "dev/lowpower.h"
#include "stm8l15x_gpio.h"
#include "stm8l15x_clk.h"
#include "stm8l15x_rtc.h"
#include "stm8l15x_adc.h"
#include "stm8l15x_pwr.h"
/***************************************************
 * get remains percent of battery level
 * return: [range 0 to 100]the remains percent of battery 
 * 0%:1.8V(the lowest supply voltage of sx1276)
 * 100%: 3.6V and above 
****************************************************/
uint8_t GetBatteryLevel(void)
{  
      uint16_t btry_vol=0;
      uint8_t  percent = 0;
      uint16_t convert_value=0;
      
      CLK_PeripheralClockConfig(CLK_Peripheral_ADC1,ENABLE);
      ADC_Init(ADC1,ADC_ConversionMode_Continuous, ADC_Resolution_12Bit, ADC_Prescaler_2);//连续模式，12位，分频2
      ADC_VrefintCmd(ENABLE);//使能内部参考电压
      ADC_ChannelCmd(ADC1, ADC_Channel_Vrefint, ENABLE);//通道使能
      ADC_Cmd(ADC1, ENABLE);
      ADC_SoftwareStartConv(ADC1);
      while(ADC_GetFlagStatus(ADC1 , ADC_FLAG_EOC) == 0);
      ADC_ClearFlag(ADC1 , ADC_FLAG_EOC);
      
      convert_value=ADC_GetConversionValue(ADC1);
      btry_vol=((u32)1225*4096)/convert_value;
      if((btry_vol >= 1800) && (btry_vol <= 3600))