tds传感器ADC转换代码

下面是一个使用STM32的ADC进行TDS传感器ADC转换的示例代码：

#include "stm32f4xx.h"
#include "stdio.h"

// 定义ADC通道
#define ADC_CHANNEL_ADC1_IN1 0

// 定义ADC采样周期
#define ADC_SAMPLE_PERIOD 500

// 定义TDS传感器的量程和参考电压
#define TDS_RANGE 4000
#define TDS_VREF 3300

// 定义TDS转换系数
#define TDS_FACTOR 1000

// 计算TDS值
uint16_t calculateTDS(uint16_t adcValue) {
  float voltage = adcValue * TDS_VREF / 4096.0;
  float tdsValue = voltage / (TDS_VREF / TDS_RANGE) * TDS_FACTOR;
  return (uint16_t)tdsValue;
}

int main(void) {
  // 启用ADC1时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

  // 初始化GPIOA
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  // 初始化ADC1
  ADC_CommonInitTypeDef ADC_CommonInitStructure;
  ADC_InitTypeDef ADC_InitStructure;
  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
  ADC_CommonInit(&ADC_CommonInitStructure);
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfConversion = 1;
  ADC_Init(ADC1, &ADC_InitStructure);

  // 启用ADC1
  ADC_Cmd(ADC1, ENABLE);

  // 初始化定时器
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  TIM_TimeBaseStructure.TIM_Period = ADC_SAMPLE_PERIOD - 1;
  TIM_TimeBaseStructure.TIM_Prescaler = 42000 - 1;
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  // 启用定时器
  TIM_Cmd(TIM2, ENABLE);

  // 等待定时器溢出
  while (1) {
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) {
      TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

      // 开始ADC转换
      ADC_RegularChannelConfig(ADC1, ADC_CHANNEL_ADC1_IN1, 1, ADC_SampleTime_480Cycles);
      ADC_SoftwareStartConv(ADC1);

      // 等待转换完成
      while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);

      // 读取转换结果并计算TDS值
      uint16_t adcValue = ADC_GetConversionValue(ADC1);
      uint16_t tdsValue = calculateTDS(adcValue);

      // 打印TDS值
      printf("TDS value: %d\n", tdsValue);
    }
  }

  return 0;
}

该代码使用了定时器TIM2来触发ADC采样，并且使用了printf函数来输出TDS值。需要在编译时启用stdio.h头文件，并且在连接时启用Semihosting功能，才能将printf函数的输出打印到调试器窗口中。