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

ADC_HandleTypeDef hadc1;
UART_HandleTypeDef huart2;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_ADC1_Init(void);
static void MX_USART2_Init(void);
void send_str(char *s);
void send_float(float f);

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_ADC1_Init();
  MX_USART2_Init();

  while (1) {
    HAL_ADC_Start(&hadc1);
    HAL_ADC_PollForConversion(&hadc1, 200);
    uint32_t val = HAL_ADC_GetValue(&hadc1);
    
    // 正确转换：STM32L0 12位ADC → PPM
    float ppm = (val * 10000.0f) / 4095.0f;

    send_str("ADC: ");
    char buf[10];
    sprintf(buf, "%lu", val);
    send_str(buf);

    send_str("  |  PPM: ");
    send_float(ppm);
    send_str("\r\n");

    HAL_Delay(500);
  }
}

// ===================== ADC 初始化（只保留兼容参数） =====================
static void MX_ADC1_Init(void)
{
  __HAL_RCC_ADC1_CLK_ENABLE();

  hadc1.Instance = ADC1;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.ContinuousConvMode = DISABLE;
  HAL_ADC_Init(&hadc1);

  ADC_ChannelConfTypeDef sConfig = {0};
  sConfig.Channel = ADC_CHANNEL_0;
  sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
  
  // 关键：删掉不支持的 SamplingTime！
  HAL_ADC_ConfigChannel(&hadc1, &sConfig);
}

// ===================== USART2 初始化 =====================
static void MX_USART2_Init(void)
{
  __HAL_RCC_USART2_CLK_ENABLE();

  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX;
  HAL_UART_Init(&huart2);
}

// ===================== GPIO 初始化（PA0 模拟输入） =====================
static void MX_GPIO_Init(void)
{
  __HAL_RCC_GPIOA_CLK_ENABLE();

  GPIO_InitTypeDef gp = {0};
  gp.Pin = GPIO_PIN_0;
  gp.Mode = GPIO_MODE_ANALOG;
  gp.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOA, &gp);
}

// ===================== 串口工具函数 =====================
void send_str(char *s) {
  while (*s) HAL_UART_Transmit(&huart2, (uint8_t*)s++, 1, 100);
}
void send_float(float f) {
  char buf[20];
  sprintf(buf, "%.1f", f);
  send_str(buf);
}

void SystemClock_Config(void){}