first commit

MS5803/ms5803.cpp

@@ -0,0 +1,163 @@
+#include "ms5803.h"
+#include <Arduino.h>
+
+
+MS5803::MS5803(uint8_t address)
+{
+	this->address = address;
+}
+
+uint8_t MS5803::begin()
+{
+
+	Wire.begin();
+
+	Wire.beginTransmission( address );
+	Wire.write( MS_RESET );
+	Wire.endTransmission();
+	delay(100);
+
+	Wire.beginTransmission( address );
+
+	for( uint8_t i = 0; i<8; i++ )
+	{
+
+		Wire.beginTransmission( address );
+		Wire.write( MS_PROMREAD0 + i*2 );
+		Wire.endTransmission();
+
+		delay(10);
+
+		Wire.requestFrom( address, 2 );
+
+		uint32_t timeout = millis();
+
+		while( !Wire.available() )
+		{
+
+			if(	( millis() - timeout ) > MS5803_TIMEOUT )
+			{
+				return 1;	//	failed to initialize device
+			}
+		}
+
+		PROM[i] = Wire.read() << 8;
+
+		if( Wire.available() )
+		{
+			PROM[i] += Wire.read();
+		}
+		else
+		{
+			return 2;
+		}
+		Serial.print("PROM");Serial.print(i);Serial.print(": ");
+		Serial.print(PROM[i]);
+		Serial.println();
+
+	}
+
+	return 0;
+
+}
+
+uint8_t MS5803::measure()
+{
+	Wire.beginTransmission( address );
+	Wire.write( MS_CONVERTD1_4096 );
+	Wire.endTransmission();
+
+	delay( 10 );
+	Wire.beginTransmission( address );
+	Wire.write( MS_ADCREAD );
+	Wire.endTransmission();
+
+	Wire.requestFrom( address , 3 );
+
+	uint32_t timeout = millis();
+	while( Wire.available() != 3 )
+	{
+		if( ( millis() - timeout ) > MS5803_TIMEOUT )
+		{
+			return 1;	//	failed to initialize device
+		}
+	}
+
+	pressure_nc = Wire.read() << 16;
+	pressure_nc += Wire.read() << 8;
+	pressure_nc += Wire.read();
+
+	Wire.endTransmission();
+
+
+	Wire.beginTransmission( address );
+	Wire.write( MS_CONVERTD2_4096 );
+	Wire.endTransmission();
+	delay( 10 );
+
+	Wire.beginTransmission( address );
+	Wire.write( MS_ADCREAD );
+	Wire.endTransmission();
+
+	Wire.requestFrom( address , 3);
+
+	timeout = millis();
+	while( Wire.available() != 3 )
+	{
+		if( ( millis() - timeout ) > MS5803_TIMEOUT )
+		{
+			return 1;	//	failed to initialize device
+		}
+	}
+
+	temp_nc = Wire.read() << 16;
+	temp_nc += Wire.read() << 8;
+	temp_nc += Wire.read();
+
+	Wire.endTransmission();
+
+	compensate();
+	return 0;
+}
+
+void MS5803::compensate()
+{
+
+	Serial.print("Temp_nc:\t");Serial.println(temp_nc);
+	int64_t dT = 0;
+	int64_t TEMP = 0;
+	int64_t OFF = 0;
+	int64_t SENS = 0;
+	int64_t PRESSURE = 0;
+
+	//	Temperature compensation
+	dT = int64_t( temp_nc ) - int64_t( int64_t( PROM[5] ) * int32_t( pow(2,8) ) );
+	TEMP = int64_t(2000) + int64_t( dT ) * int64_t( PROM[6] ) / int32_t( pow(2,23) );
+
+
+	//	Pressure Compensation
+	OFF = int64_t( PROM[2] ) * int32_t( pow(2,17) )  + int64_t( PROM[4] ) * dT  / int32_t( pow(2,6) );
+
+	SENS = int64_t( PROM[1] ) * int32_t( pow(2,16) )  + int64_t( PROM[3] ) * dT  / int32_t( pow(2,7) );
+
+	PRESSURE = int64_t( pressure_nc * ( SENS / int32_t( pow(2,21) ) ) ) - OFF;
+
+	PRESSURE = PRESSURE / int32_t( pow(2,15) );
+
+	//	convert to float
+	pressure_c = float( PRESSURE ) / 1000.00;	//	kPa
+	temp_c = float( TEMP ) / 100.00;			//	degrees C
+
+}
+
+float MS5803::getPressure()
+{
+	return pressure_c;
+}
+
+float MS5803::getTemperature()
+{
+	return temp_c;
+}
+
+

MS5803/ms5803.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <Wire.h>
+
+#define MS5803_TIMEOUT			5000
+#define MS_RESET             	0x1E
+#define MS_CONVERTD1_256     	0x40
+#define MS_CONVERTD1_512     	0x42
+#define MS_CONVERTD1_1024    	0x44
+#define MS_CONVERTD1_2048    	0x46
+#define MS_CONVERTD1_4096    	0x48
+#define MS_CONVERTD2_256     	0x50
+#define MS_CONVERTD2_512     	0x52
+#define MS_CONVERTD2_1024    	0x54
+#define MS_CONVERTD2_2048    	0x56
+#define MS_CONVERTD2_4096    	0x58
+#define MS_ADCREAD           	0x00
+#define MS_PROMREAD0        	0xA0
+
+#define MS_ADDRESS				0x77
+
+class MS5803 {
+private:
+	uint16_t PROM[8];
+	float temp_c = 0;
+	float pressure_c = 0;
+	int32_t temp_nc = 0;
+	int32_t pressure_nc = 0;
+	uint8_t address;
+
+	void compensate();
+
+public:
+	MS5803(uint8_t);
+	uint8_t begin();
+	uint8_t measure();
+	float getPressure();
+	float getTemperature();
+};