#include "adc.h"
#include <stdio.h>

ADC_HandleTypeDef hadc1;

void adcInit(void)
{
    ADC_ChannelConfTypeDef sConfig = {0};
    hadc1.Instance = ADC1;
    hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
    hadc1.Init.ContinuousConvMode = DISABLE;
    hadc1.Init.DiscontinuousConvMode = DISABLE;
    hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
    hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
    hadc1.Init.NbrOfConversion = 1;
    if (HAL_ADC_Init(&hadc1) != HAL_OK) Error_Handler();

    sConfig.Channel = ADC_CHANNEL_0;   /* PA0 */
    sConfig.Rank = ADC_REGULAR_RANK_1;
    sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
    if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) Error_Handler();
}

uint16_t getAdc(void)
{
    uint16_t adc_value = 0;
    HAL_ADC_Start(&hadc1);
    if (HAL_ADC_PollForConversion(&hadc1, 10) == HAL_OK) {
        adc_value = HAL_ADC_GetValue(&hadc1);
    }
    HAL_ADC_Stop(&hadc1);
    return adc_value;
}

/* 电池电量百分比（0~100），公式参数见 main.h BAT_* 宏 */
int battery_percent(void)
{
    float v = getAdc() * (3.3f / 4096.0f);
    v = v * BAT_DIV_RATIO + BAT_OFFSET_V;
    float pct = 100.0f * (v - BAT_EMPTY_V) / (BAT_FULL_V - BAT_EMPTY_V);
    if (pct < 0) pct = 0;
    if (pct > 100) pct = 100;
    return (int)pct;
}