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/*
 * MAX31865_lib.c
 *
 *  Created on: Aug 6, 2023
 *      Author: mertcangelbal
 */

#include "MAX31865_lib.h"
#include "stm32f7xx_hal.h"

//#define CS_Pin HAL_GPIO_PIN_ARD_D9

#define MAX31865_PT100_R0 (double)100.0
#define MAX31865_Rref (double)428.5          //Referans direnç değeri

#define MAX31865_A (double)0.0039083
#define MAX31865_B (double)0.0000005775

double MAX31865_PT100_R = 0.0;               //PT100 Receive Değeri
double MAX31865_PT100_T = 0.0;               //PT100 Transmit Değeri
bool MAX31865_Sensor_Error = 0;

//#define cs_set() CS_GPIO_Port->BSRR = (uint32_t) CS_Pin << 16u; //CS Pin << 16u ===> HAL_GPIO_PIN_
//#define cs_reset() CS_GPIO_Port->BSRR = CS_Pin;

extern SPI_HandleTypeDef hspi2;

Max31865_t max_pt100;

void MAX31865_Init(uint8_t num_wires){
	uint8_t MAX31865_Reinitialization_cnt = 0;
	MAX31865_Sensor_Error = 0;
	uint8_t MAX31865_Configuration_register_write[] = {0x80,0x00};

	if((num_wires == 2) || (num_wires == 4)){
		MAX31865_Configuration_register_write[1] = 0xC3;
	}
	else if(num_wires == 3){
		MAX31865_Configuration_register_write[1] = 0xD3;
	}
//	cs_set();
	HAL_GPIO_WritePin(max_pt100.cs_gpio,max_pt100.cs_pin,GPIO_PIN_RESET);
	HAL_SPI_Transmit(&hspi2, MAX31865_Configuration_register_write, 2, 100);
	HAL_GPIO_WritePin(max_pt100.cs_gpio,max_pt100.cs_pin,GPIO_PIN_SET);
//	cs_reset();
	while(MAX31865_Configuration_info() != 0xD1 && MAX31865_Configuration_info() != 0xC1){
		MAX31865_Reinitialization_cnt++;

//		cs_set();
		HAL_GPIO_WritePin(max_pt100.cs_gpio,max_pt100.cs_pin,GPIO_PIN_RESET);
		HAL_SPI_Transmit(&hspi2, MAX31865_Configuration_register_write, 2, 100);
		HAL_GPIO_WritePin(max_pt100.cs_gpio,max_pt100.cs_pin,GPIO_PIN_SET);
//		cs_reset();

		if(MAX31865_Reinitialization_cnt == 100){
			break;
		}
	}
}

uint8_t MAX31865_Configuration_info(void){
	uint8_t read_data = 0x00;
	uint8_t MAX31865_Configuration = 0x00;
//	cs_set();
	HAL_GPIO_WritePin(max_pt100.cs_gpio,max_pt100.cs_pin,GPIO_PIN_RESET);
	HAL_SPI_Transmit(&hspi2, &read_data, 1, 100);
	HAL_SPI_Receive(&hspi2, &MAX31865_Configuration, 1, 100);
	HAL_GPIO_WritePin(max_pt100.cs_gpio,max_pt100.cs_pin,GPIO_PIN_SET);
//	cs_reset();
	return MAX31865_Configuration;
}

double MAX31865_Get_Temperature(void){
	double data;

	struct rx_data_MAX31865{
		uint16_t RTD_Resistance_Registers; //Direnç Kayıtları
		uint16_t High_Fault_Threshold;     //Üst Hata Eşiği
		uint16_t Low_Fault_Threshold;      //Alt Hata Eşiği
		uint8_t  Fault_Status;             //Hata Durumu
	};

	struct rx_data_MAX31865 MAX31865_Receive_Data;

	uint8_t MAX31865_Start_Address_of_the_poll = 0x00; //Adres Başlangıç Seçimi
	uint8_t MAX31865_rx_buffer[7];
//	cs_set();
	HAL_GPIO_WritePin(max_pt100.cs_gpio,max_pt100.cs_pin,GPIO_PIN_RESET);
	HAL_SPI_Transmit(&hspi2, &MAX31865_Start_Address_of_the_poll, 1, 100);
	HAL_SPI_Receive(&hspi2, MAX31865_rx_buffer, 7, 100);
	HAL_GPIO_WritePin(max_pt100.cs_gpio,max_pt100.cs_pin,GPIO_PIN_SET);
//	cs_reset();
	MAX31865_Receive_Data.RTD_Resistance_Registers = ((MAX31865_rx_buffer[0] << 8) | MAX31865_rx_buffer[1]) >> 1; //Direnç Kaydı
	MAX31865_Receive_Data.High_Fault_Threshold = ((MAX31865_rx_buffer[2] << 8) | MAX31865_rx_buffer[3]) >> 1;     //Üst Hata Eşik Verisi
	MAX31865_Receive_Data.Low_Fault_Threshold = (MAX31865_rx_buffer[4] << 8) | MAX31865_rx_buffer[5];;            //Düşük Hata Eşik Verisi
	MAX31865_Receive_Data.Fault_Status = MAX31865_rx_buffer[6];                                                   //Hata Verisi

	if(MAX31865_Receive_Data.Fault_Status > 0x00){
		MAX31865_Sensor_Error = 1;
		//Hata Sıfırlamak için sistemi yeniden başlatıyor
		MAX31865_Init(3);
		MAX31865_Sensor_Error = 0;
	}

	data = ((double)MAX31865_Receive_Data.RTD_Resistance_Registers * MAX31865_Rref) / (double)32768.0; //PT100'ün direnç değeri 4000 ile 400 arasında
	return MAX31865_Get_Temperatur_Math(data);
}


double MAX31865_Get_Temperatur_Math(double PT100_Resistance){ //double PT100_Resistance -> data
	if(PT100_Resistance >= (double)100.0){
		double MAX31865_Math_Discriminant = (double) 0.00001527480889 - ((double) -0.00000231 * (1 - (PT100_Resistance / MAX31865_PT100_R0 )));
		MAX31865_PT100_T = ((double) -0.0039083 + sqrt(MAX31865_Math_Discriminant)) / (double) -0.000001155;
	}
	else{
		MAX31865_PT100_T = (double) 0.000000000270 * pow(PT100_Resistance, 5) - (double) 0.000000066245 * pow(PT100_Resistance, 4) - (double) 0.000000184636 * pow(PT100_Resistance, 3)
						+ (double) 0.002320232987 * pow(PT100_Resistance, 2) + (double) 2.229927824035 * PT100_Resistance - (double) 242.090854986215;
	}
	return MAX31865_PT100_T;
}