Updated MS5837 Library to add support for the MS5837_30BA Sensor.
Dependents: AUV_depth_sensor_072319
MS5837.cpp
- Committer:
- yuuitirou528
- Date:
- 2018-07-17
- Revision:
- 2:365c8caabc0e
- Parent:
- 1:ee71a13b8e68
- Child:
- 3:128270625e55
File content as of revision 2:365c8caabc0e:
#include <stdlib.h> #include "MS5837.h" /* * Sensor operating function according data sheet */ void MS5837::MS5837Init(void) { MS5837Reset(); MS5837ReadProm(); return; } /* Send soft reset to the sensor */ void MS5837::MS5837Reset(void) { /* transmit out 1 byte reset command */ ms5837_tx_data[0] = ms5837_reset; if ( i2c.write( device_address, ms5837_tx_data, 1 ) ); printf("send soft reset\n"); wait_ms(20); } /* read the sensor calibration data from rom */ void MS5837::MS5837ReadProm(void) { uint8_t i,j; for (i=0; i<8; i++) { j = i; ms5837_tx_data[0] = ms5837_PROMread + (j<<1); if ( i2c.write( device_address, ms5837_tx_data, 1 ) ); if ( i2c.read( device_address, ms5837_rx_data, 2 ) ); C[i] = ms5837_rx_data[1] + (ms5837_rx_data[0]<<8); } } /* Start the sensor pressure conversion */ void MS5837::MS5837ConvertD1(void) { ms5837_tx_data[0] = ms5837_convD1; if ( i2c.write( device_address, ms5837_tx_data, 1 ) ); } /* Start the sensor temperature conversion */ void MS5837:: MS5837ConvertD2(void) { ms5837_tx_data[0] = ms5837_convD2; if ( i2c.write( device_address, ms5837_tx_data, 1 ) ); } /* Read the previous started conversion results */ int32_t MS5837::MS5837ReadADC(void) { int32_t adc; wait_ms(150); ms5837_tx_data[0] = ms5837_ADCread; if ( i2c.write( device_address, ms5837_tx_data, 1 ) ); if ( i2c.read( device_address, ms5837_rx_data, 3 ) ); adc = ms5837_rx_data[2] + (ms5837_rx_data[1]<<8) + (ms5837_rx_data[0]<<16); //printf("ADC value: %x\n", adc); return (adc); } /* return the results */ float MS5837::MS5837_Pressure (void) { return P_MS5837; } float MS5837::MS5837_Temperature (void) { return T_MS5837; } /* Sensor reading and calculation procedure */ void MS5837::Barometer_MS5837(void) { int32_t dT, temp; int64_t OFF, SENS, press; //int32_t dT = 0; //int64_t SENS = 0; //int64_t OFF = 0; int32_t SENSi = 0; int32_t OFFi = 0; int32_t Ti = 0; int64_t OFF2 = 0; int64_t SENS2 = 0; //no need to do this everytime! MS5837ConvertD1(); // start pressure conversion D1 = MS5837ReadADC(); // read the pressure value MS5837ConvertD2(); // start temperature conversion D2 = MS5837ReadADC(); // read the temperature value //printf("D1 = %d\n", D1); /* calculation according MS5837-01BA data sheet DA5837-01BA_006 */ dT = D2 - ((uint32_t)C[5]* 256); OFF = (int64_t)C[2] * (1<<17) + ((int64_t)dT * (int64_t)C[4]) / (1<<6); SENS = (int64_t)C[1] * (1<<16) + ((int64_t)dT * (int64_t)C[3]) / (1<<7); temp = 2000 + ((int64_t)dT * C[6]) / (1<<23); press = (((int64_t)D1 * SENS) / (1<<21) - OFF) / (1<<15); if((temp/100)<20){ //Low temp //Serial.println("here"); Ti = (11*int64_t(dT)*int64_t(dT))/(34359738368LL); OFFi = (31*(temp-2000)*(temp-2000))/8; SENSi = (63*(temp-2000)*(temp-2000))/32; } OFF2 = OFF-OFFi; //Calculate pressure and temp second order SENS2 = SENS-SENSi; temp = (temp-Ti); press = (((D1*SENS2)/2097152l-OFF2)/32768l); T_MS5837 = (float) temp / 100.0f; // result of temperature in deg C in this var P_MS5837 = (float) press / 100.0f; // result of pressure in mBar in this var } float MS5837::depth(void) { //return (P_MS5837/100)*1.019716; return ((P_MS5837*100)-101300)/(fluidDensity*9.80665); } float MS5837::altitude(void) { //return (P_MS5837/100)*1.019716; return (1-pow((P_MS5837/1013.25),0.190284))*145366.45*0.3048; }