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Update BMP180.c #1

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206 changes: 108 additions & 98 deletions C/BMP180.c
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Original file line number Diff line number Diff line change
Expand Up @@ -11,113 +11,123 @@
#include <fcntl.h>
#include <math.h>

void main()
void main()
{
// Create I2C bus
int file;
char *bus = "/dev/i2c-1";
if((file = open(bus, O_RDWR)) < 0)
{
printf("Failed to open the bus. \n");
exit(1);
}
// Get I2C device, VEML6070 I2C address is 0x77(119)
ioctl(file, I2C_SLAVE, 0x77);
// Create I2C bus
int file;
char *bus = "/dev/i2c-2";
if((file = open(bus, O_RDWR)) < 0)
{
printf("Failed to open the bus. \n");
exit(1);
}
// Get I2C device, VEML6070 I2C address is 0x77(119)
ioctl(file, I2C_SLAVE, 0x77);

// Calibration Cofficients stored in EEPROM of the device
// Read 22 bytes of data from address 0xAA(170)
char data[22] = {0};
read(file, data, 22);
// Calibration Cofficients stored in EEPROM of the device
// Read 22 bytes of data from address 0xAA(170)
char data[22] = {0};
char reg_data[1] = {0xAA};
write(file, reg_data, 1);
read(file, data, 22);

// Convert the data
int AC1 = data[0] * 256 + data[1];
int AC2 = data[2] * 256 + data[3];
int AC3 = data[4] * 256 + data[5];
int AC4 = data[6] * 256 + data[7];
int AC5 = data[8] * 256 + data[9];
int AC6 = data[10] * 256 + data[11];
int B1 = data[12] * 256 + data[13];
int B2 = data[14] * 256 + data[15];
int MB = data[16] * 256 + data[17];
int MC = data[18] * 256 + data[19];
int MD = data[20] * 256 + data[21];
sleep(1);
// Convert the data
long AC1 = data[0] * 256 + data[1];
if (AC1 > 32767) { AC1 -= 65535; }
long AC2 = data[2] * 256 + data[3];
if (AC2 > 32767) { AC2 -= 65535; }
long AC3 = data[4] * 256 + data[5];
if (AC3 > 32767) { AC3 -= 65535; }
long AC4 = data[6] * 256 + data[7];
long AC5 = data[8] * 256 + data[9];
long AC6 = data[10] * 256 + data[11];
long B1 = data[12] * 256 + data[13];
if (B1 > 32767) { B1 -= 65535; }
long B2 = data[14] * 256 + data[15];
if (B2 > 32767) { B2 -= 65535; }
long MB = data[16] * 256 + data[17];
if (MB > 32767) { MB -= 65535; }
long MC = data[18] * 256 + data[19];
if (MC > 32767) { MC -= 65535; }
long MD = data[20] * 256 + data[21];
if (MD > 32767) { MD -= 65535; }
sleep(1);

// Select measurement control register(0xF4)
// Enable temperature measurement(0x2E)
char config[2]= {0};
config[0] = 0xF4;
config[1] = 0x2E;
write(file, config, 2);
sleep(1);

// Read 2 bytes of data from register(0xF6)
// temp msb, temp lsb
char reg[1] = {0xF6};
write(file, reg, 1);
if(read(file, data, 2) != 2)
{
printf("Erorr : Input/output Erorr \n");
exit(1);
}
// Select measurement control register(0xF4)
// Enable temperature measurement(0x2E)
char config[2]= {0};
config[0] = 0xF4;
config[1] = 0x2E;
write(file, config, 2);
sleep(1);

// Convert the data
int temp = (data[0] * 256 + data[1]);
// Read 2 bytes of data from register(0xF6)
// temp msb, temp lsb
char reg[1] = {0xF6};
write(file, reg, 1);
if(read(file, data, 2) != 2)
{
printf("Erorr : Input/output Erorr \n");
exit(1);
}

// Select measurement control register(0xf4)
// Enable pressure measurement, OSS = 1(0x74)
config[0] = 0xF4;
config[1] = 0x74;
write(file, config, 2);
sleep(1);

// Read 3 bytes of data from register(0xF6)
// pres msb1, pres msb, pres lsb
reg[0] = 0xF6;
write(file, reg, 1);
read(file, data, 3);
// Convert the data
int temp = (data[0] * 256 + data[1]);

// Convert the data
long pres = (data[0] * 65536 + (data[1] * 256) + data[2]) / 128;
// Select measurement control register(0xf4)
// Enable pressure measurement, OSS = 1(0x74)
config[0] = 0xF4;
config[1] = 0x74;
write(file, config, 2);
sleep(1);

// Callibration for Temperature
long X1 = (temp - AC6) * AC5 / 32768.0;
long X2 = (MC * 2048.0) / (X1 + MD);
long B5 = X1 + X2;
long cTemp = ((B5 + 8.0) / 16.0) / 10.0;
long fTemp = cTemp * 1.8 + 32;
// Read 3 bytes of data from register(0xF6)
// pres msb1, pres msb, pres lsb
reg[0] = 0xF6;
write(file, reg, 1);
read(file, data, 3);

// Calibration for Pressure
long B6 = B5 - 4000;
X1 = (B2 * (B6 * B6 / 4096.0)) / 2048.0;
X2 = AC2 * B6 / 2048.0;
long X3 = X1 + X2;
long B3 = (((AC1 * 4 + X3) * 2) + 2) / 4.0;
X1 = AC3 * B6 / 8192.0;
X2 = (B1 * (B6 * B6 / 2048.0)) / 65536.0;
X3 = ((X1 + X2) + 2) / 4.0;
long B4 = AC4 * (X3 + 32768) / 32768.0;
long B7 = ((pres - B3) * (25000.0));
long pressure = 0.0;
if(B7 < 2147483648L)
{
pressure = (B7 * 2) / B4;
}
else
{
pressure = (B7 / B4) * 2;
}
X1 = (pressure / 256.0) * (pressure / 256.0);
X1 = (X1 * 3038.0) / 65536.0;
X2 = ((-7357) * pressure) / 65536.0;
long pressure1 = (pressure + (X1 + X2 + 3791) / 16.0) / 100;
// Convert the data
double pres = (data[0] * 65536 + (data[1] * 256) + data[2]) / 128;

// Calculate Altitude
long altitude = 44330 * (1 - pow(pressure1/1013.25, 0.1903));
// Callibration for Temperature
double X1 = (temp - AC6) * AC5 / 32768.0;
double X2 = (MC * 2048.0) / (X1 + MD);
double B5 = X1 + X2;
double cTemp = ((B5 + 8.0) / 16.0) / 10.0;
double fTemp = cTemp * 1.8 + 32;

// Output data to screen
printf("Altitude : %.2f m \n", altitude);
printf("Pressure : %.2f hPa \n", pressure1);
printf("Temperature in Celsius : %.2f C \n", cTemp);
printf("Temperature in Fahrenheit : %.2f F \n", fTemp);
// Calibration for Pressure
double B6 = B5 - 4000;
X1 = (B2 * (B6 * B6 / 4096.0)) / 2048.0;
X2 = AC2 * B6 / 2048.0;
double X3 = X1 + X2;
double B3 = (((AC1 * 4 + X3) * 2) + 2) / 4.0;
X1 = AC3 * B6 / 8192.0;
X2 = (B1 * (B6 * B6 / 2048.0)) / 65536.0;
X3 = ((X1 + X2) + 2) / 4.0;
double B4 = AC4 * (X3 + 32768) / 32768.0;
double B7 = ((pres - B3) * (25000.0));
double pressure = 0.0;
if(B7 < 2147483648LU)
{
pressure = (B7 * 2) / B4;
}
else
{
pressure = (B7 / B4) * 2;
}
X1 = (pressure / 256.0) * (pressure / 256.0);
X1 = (X1 * 3038.0) / 65536.0;
X2 = ((-7357) * pressure) / 65536.0;
double pressure1 = (pressure + (X1 + X2 + 3791) / 16.0) / 100;

// Calculate Altitude
double altitude = 44330 * (1 - pow(pressure1/1013.25, 0.1903));

// Output data to screen
printf("Altitude : %.2f m \n", altitude);
printf("Pressure : %.2f hPa \n", pressure1);
printf("Temperature in Celsius : %.2f C \n", cTemp);
printf("Temperature in Fahrenheit : %.2f F \n", fTemp);
}