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70 lines
1.7 KiB
70 lines
1.7 KiB
/*
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* bsp_adc.c
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*
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* Created on: Feb 21, 2025
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* Author: akeguo
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*/
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#include "bsp_adc.h"
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#include "adc.h"
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#include "stm32h7xx_hal_adc.h"
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#include <math.h>
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// 硬件相关参数配置
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#define ADC_MAX_VALUE 0xffff // 16位ADC最大值，若为10位ADC改为1023
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#define VREF 3.3f // ADC参考电压
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// 热敏电阻参数 (需根据实际型号确认)
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#define R_REF 10000.0f // 分压电阻阻值(与热敏电阻串联)
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#define B_VALUE 3380.0f // B常数 (需确认具体型号参数)
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#define R0 10000.0f // 25°C时的标称阻值
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#define T0 298.15f // 25°C对应的开尔文温度(25 + 273.15)
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uint32_t adc_value;
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int32_t read_temperature()
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{
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HAL_ADC_Start(&hadc2); //开启ADC1
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if (HAL_ADC_PollForConversion(&hadc2, 100) == HAL_OK)
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{
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//16 bit resolution
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adc_value = HAL_ADC_GetValue(&hadc2);
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HAL_ADC_Stop(&hadc2);
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// 1. 计算热敏电阻两端电压
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float voltage = (adc_value / (float) ADC_MAX_VALUE) * VREF;
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// 2. 计算热敏电阻阻值（分压电路公式）
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float ntc_resistance = (voltage * R_REF) / (VREF - voltage);
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//float ntc_resistance = (voltage * R_REF) / (VREF);
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// 3. 使用Steinhart-Hart方程计算温度
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float steinhart;
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steinhart = ntc_resistance / R0; // (R/R0)
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steinhart = log(steinhart); // ln(R/R0)
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steinhart /= B_VALUE; // 1/B * ln(R/R0)
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steinhart += 1.0 / T0; // + (1/T0)
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steinhart = 1.0 / steinhart; // 取倒数得到开尔文温度
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// 4. 转换为摄氏度并返回
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return (int32_t)((steinhart - 273.15)*100);
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}
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else
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{
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adc_value = 0;
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HAL_ADC_Stop(&hadc2);
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return 0;
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}
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}
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int32_t temperature;
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double GetTempature()
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{
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//return 0;
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}
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