#include "stm32l0xx_hal.h"
#include <stdio.h>

ADC_HandleTypeDef hadc1;
UART_HandleTypeDef huart1;

// 重定向printf到串口
int fputc(int ch, FILE *f) {
  HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 100);
  return ch;
}

// 读取ADC原始值
uint32_t Read_ADC(void) {
  HAL_ADC_Start(&hadc1);
  HAL_ADC_PollForConversion(&hadc1, 100);
  return HAL_ADC_GetValue(&hadc1);
}

// ADC值转换为气体浓度（ppm）
float ADC_to_PPM(uint32_t adc) {
  // 线性换算：12位ADC（0-4095）对应0-10000ppm
  return (float)adc / 4095.0f * 10000.0f;
}

int main(void) {
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_ADC1_Init();
  MX_USART1_Init();

  while (1) {
    uint32_t adc_val = Read_ADC();
    float ppm = ADC_to_PPM(adc_val);

    printf("ADC原始值: %lu \r\n", adc_val);
    printf("气体浓度 : %.1f PPM \r\n\r\n", ppm);

    HAL_Delay(500);
  }
}

// ADC初始化（PA0通道）
static void MX_ADC1_Init(void) {
  __HAL_RCC_ADC1_CLK_ENABLE();
  ADC_ChannelConfTypeDef sConfig = {0};

  hadc1.Instance = ADC1;
  hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
  hadc1.Init.ContinuousConvMode = DISABLE;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.NbrOfConversion = 1;
  HAL_ADC_Init(&hadc1);

  sConfig.Channel = ADC_CHANNEL_0;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SamplingTime = ADC_SAMPLETIME_13CYCLES_5;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig);
}

// 串口初始化（波特率115200）
static void MX_USART1_Init(void) {
  __HAL_RCC_USART1_CLK_ENABLE();
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX;
  HAL_UART_Init(&huart1);
}

static void MX_GPIO_Init(void) {
  __HAL_RCC_GPIOA_CLK_ENABLE();
}

void SystemClock_Config(void) {
  // Wokwi仿真默认配置，此处省略
}