写出基于stm32HAL库测量ph需要的adc转换程序

以下是基于STM32 HAL库的pH测量ADC转换程序示例：

#include "stm32f4xx_hal.h"

ADC_HandleTypeDef hadc1;

void ADC_Init(void)
{
  // Enable ADC Clock
  __HAL_RCC_ADC1_CLK_ENABLE();

  // Configure ADC GPIO pins
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  GPIO_InitStruct.Pin = GPIO_PIN_0;  // ADC pin
  GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  // Configure ADC
  hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  hadc1.Init.ScanConvMode = DISABLE;
  hadc1.Init.ContinuousConvMode = ENABLE;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.NbrOfDiscConversion = 0;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.NbrOfConversion = 1;
  hadc1.Init.DMAContinuousRequests = DISABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  HAL_ADC_Init(&hadc1);

  // Configure ADC Channel
  ADC_ChannelConfTypeDef sConfig = {0};
  sConfig.Channel = ADC_CHANNEL_0;
  sConfig.Rank = 1;
  sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig);
}

float readPH(void)
{
  int adcValue = 0;
  float voltage = 0.0f;
  float ph = 0.0f;

  // Start ADC conversion
  HAL_ADC_Start(&hadc1);

  // Wait for ADC conversion to complete
  HAL_ADC_PollForConversion(&hadc1, 100);

  // Read ADC value and convert to voltage
  adcValue = HAL_ADC_GetValue(&hadc1);
  voltage = (float)adcValue / 4095.0f * 3.3f;

  // Convert voltage to pH
  ph = 7.0f - (voltage - 2.5f) / 0.18f;

  return ph;
}

其中，ADC_Init()函数用于初始化ADC，readPH()函数用于读取ADC转换值并计算pH值。这里使用了ADC1和PA0引脚进行ADC转换，采用12位分辨率，连续转换模式，采样时间为480个时钟周期。在readPH()函数中，首先启动ADC转换，等待转换完成，然后读取转换值并计算pH值。这里使用了简单的线性转换公式将电压转换为pH值。