Files
meshcore-wch/User/lib/adc/temperature.c
2025-12-28 12:23:11 +01:00

250 lines
7.2 KiB
C

/********************************** (C) COPYRIGHT *******************************
* File Name : temperature.c
* Author : WCH
* Version : V1.0.0
* Date : 2023/11/17
* Description : Temperature program body.
*********************************************************************************
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* Attention: This software (modified or not) and binary are used for
* microcontroller manufactured by Nanjing Qinheng Microelectronics.
*******************************************************************************/
/*
*@Note
*Internal temperature sensor routine:
*Through the ADC channel 16, the output voltage value and temperature value of the internal
*temperature sensor are collected.
*
*/
#include "debug.h"
#include "lib/telemetry/telemetry.h"
/* Global Variable */
s16 Calibrattion_Val = 0;
/*********************************************************************
* @fn ADC_Function_Init
*
* @brief Initializes ADC collection.
*
* @return none
*/
void ADC_Function_Init(void)
{
ADC_InitTypeDef ADC_InitStructure={0};
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE );
RCC_ADCCLKConfig(RCC_PCLK2_Div8);
ADC_DeInit(ADC1);
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_Cmd(ADC1, ENABLE);
ADC_BufferCmd(ADC1, DISABLE); //disable buffer
ADC_ResetCalibration(ADC1);
while(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
while(ADC_GetCalibrationStatus(ADC1));
Calibrattion_Val = Get_CalibrationValue(ADC1);
ADC_BufferCmd(ADC1, ENABLE); //enable buffer
ADC_TempSensorVrefintCmd(ENABLE);
}
/*********************************************************************
* @fn Get_ADC_Val
*
* @brief Returns ADCx conversion result data.
*
* @param ch - ADC channel.
* ADC_Channel_0 - ADC Channel0 selected.
* ADC_Channel_1 - ADC Channel1 selected.
* ADC_Channel_2 - ADC Channel2 selected.
* ADC_Channel_3 - ADC Channel3 selected.
* ADC_Channel_4 - ADC Channel4 selected.
* ADC_Channel_5 - ADC Channel5 selected.
* ADC_Channel_6 - ADC Channel6 selected.
* ADC_Channel_7 - ADC Channel7 selected.
* ADC_Channel_8 - ADC Channel8 selected.
* ADC_Channel_9 - ADC Channel9 selected.
* ADC_Channel_10 - ADC Channel10 selected.
* ADC_Channel_11 - ADC Channel11 selected.
* ADC_Channel_12 - ADC Channel12 selected.
* ADC_Channel_13 - ADC Channel13 selected.
* ADC_Channel_14 - ADC Channel14 selected.
* ADC_Channel_15 - ADC Channel15 selected.
* ADC_Channel_16 - ADC Channel16 selected.
* ADC_Channel_17 - ADC Channel17 selected.
*
* @return none
*/
u16 Get_ADC_Val(u8 ch)
{
u16 val;
ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_239Cycles5 );
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));
val = ADC_GetConversionValue(ADC1);
return val;
}
/*********************************************************************
* @fn Get_ADC_Average
*
* @brief Returns ADCx conversion result average data.
*
* @param ch - ADC channel.
* ADC_Channel_0 - ADC Channel0 selected.
* ADC_Channel_1 - ADC Channel1 selected.
* ADC_Channel_2 - ADC Channel2 selected.
* ADC_Channel_3 - ADC Channel3 selected.
* ADC_Channel_4 - ADC Channel4 selected.
* ADC_Channel_5 - ADC Channel5 selected.
* ADC_Channel_6 - ADC Channel6 selected.
* ADC_Channel_7 - ADC Channel7 selected.
* ADC_Channel_8 - ADC Channel8 selected.
* ADC_Channel_9 - ADC Channel9 selected.
* ADC_Channel_10 - ADC Channel10 selected.
* ADC_Channel_11 - ADC Channel11 selected.
* ADC_Channel_12 - ADC Channel12 selected.
* ADC_Channel_13 - ADC Channel13 selected.
* ADC_Channel_14 - ADC Channel14 selected.
* ADC_Channel_15 - ADC Channel15 selected.
* ADC_Channel_16 - ADC Channel16 selected.
* ADC_Channel_17 - ADC Channel17 selected.
*
* @return val - The Data conversion value.
*/
u16 Get_ADC_Average(u8 ch,u8 times)
{
u32 temp_val=0;
u8 t;
u16 val;
for(t=0;t<times;t++)
{
temp_val+=Get_ADC_Val(ch);
Delay_Ms(5);
}
val = temp_val/times;
return val;
}
/*********************************************************************
* @fn Get_ConversionVal
*
* @brief Get Conversion Value.
*
* @param val - Sampling value
*
* @return val+Calibrattion_Val - Conversion Value.
*/
u16 Get_ConversionVal(s16 val)
{
if((val+Calibrattion_Val)<0|| val==0) return 0;
if((Calibrattion_Val+val)>4095||val==4095) return 4095;
return (val+Calibrattion_Val);
}
s32 TempSensor_Volt_To_Temper_x10(s32 Value)
{
s32 Temper_x10;
s32 Refer_Volt, Refer_Temper;
s32 k = 43; // slope in mV/¡ãC
// Read factory calibration values
Refer_Volt = (s32)((*(u32 *)0x1FFFF720) & 0x0000FFFF); // mV at reference temp
Refer_Temper = (s32)(((*(u32 *)0x1FFFF720) >> 16) & 0x0000FFFF); // ¡ãC
// Compute temperature in decicelsius
// Formula: T_x10 = Tref*10 - ((V - Vref)*100 + k/2) / k
// Multiply (V - Vref) by 100 to get tenths of ¡ãC
Temper_x10 = Refer_Temper * 10 - ((Value - Refer_Volt) * 100 + (k / 2)) / k;
return Temper_x10;
}
s32 getTemperature(void)
{
u16 ADC_val;
s32 val_mv;
ADC_val = Get_ADC_Average( ADC_Channel_TempSensor, 10 );
ADC_val = Get_ConversionVal(ADC_val);
val_mv = (ADC_val*3300/4096);
return TempSensor_Volt_To_Temper(val_mv);
}
s16 getDeciTemperature(void)
{
u16 ADC_val;
s32 val_mv;
ADC_val = Get_ADC_Average( ADC_Channel_TempSensor, 10 );
ADC_val = Get_ConversionVal(ADC_val);
val_mv = (ADC_val*3300/4096);
s32 temp_x10 = TempSensor_Volt_To_Temper_x10(val_mv);
int16_t temp16 = (int16_t)temp_x10; // store in 2 bytes
return temp16;
}
s32 getVoltage(void)
{
u16 ADC_val;
s32 val_mv;
ADC_val = Get_ADC_Average( ADC_Channel_0, 10 );
ADC_val = Get_ConversionVal(ADC_val);
val_mv = (ADC_val*3300/4096);
return val_mv;
}
// Helper: convert signed 24-bit int to 3 bytes (big-endian)
void int24_to_bytes(int32_t value, uint8_t *bytes) {
if (value < 0) value += 0x1000000; // 2's complement for 24-bit
bytes[0] = (value >> 16) & 0xFF;
bytes[1] = (value >> 8) & 0xFF;
bytes[2] = value & 0xFF;
}
// Encode GPS into CayenneLPP payload
void encode_gps(uint8_t channel, float lat, float lon, float alt, uint8_t *payload) {
payload[0] = channel;
payload[1] = LPP_GPS; // GPS type
int32_t latInt = lat * 10000;
int32_t lonInt = lon * 10000;
int32_t altInt = alt * 100;
int24_to_bytes(latInt, &payload[2]);
int24_to_bytes(lonInt, &payload[5]);
int24_to_bytes(altInt, &payload[8]);
}