Diff: BMP180.h

Revision:

7:5acbc9a636d3

Parent:

6:25ed8e2df02e

diff -r 25ed8e2df02e -r 5acbc9a636d3 BMP180.h
--- a/BMP180.h	Wed Jan 10 16:42:44 2018 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,155 +0,0 @@
-#ifndef BMP180_H
-#define BMP180_H
- 
-#include "mbed.h"
-
-#define BMP180_ADDRESS          0x77<<1 // I2C address of BMP180, eight bit address on mbed
-#define BMP180_WHO_AM_I         0xD0    // WHO_AM_I id of BMP180, should return 0x55
-#define BMP180_RESET            0xE0
-#define BMP180_CONTROL          0xF4
-#define BMP180_OUT_MSB          0xF6
-#define BMP180_OUT_LSB          0xF7
-#define BMP180_OUT_XLSB         0xF8
-
-// Set initial input parameters
-
-enum OSS {  // BMP-085 sampling rate
-  OSS_0 = 0,  // 4.5 ms conversion time
-  OSS_1,      // 7.5
-  OSS_2,      // 13.5
-  OSS_3       // 25.5
-};
-
-uint8_t OSS = OSS_3;           // maximum pressure resolution
-
-//Set up I2C, (SDA,SCL)
-I2C i2c(I2C_SDA, I2C_SCL);
-    
-// These are constants used to calculate the temperature and pressure from the BMP-180 sensor
-int16_t ac1, ac2, ac3, b1, b2, mb, mc, md, b5;  
-uint16_t ac4, ac5, ac6;
-
-class BMP180 {
- 
-    protected:
- 
-    public:
-  //===================================================================================================================
-//====== Set of useful function to access pressure and temperature data
-//===================================================================================================================
-
-    void writeByte(uint8_t address, uint8_t subAddress, uint8_t data)
-{
-   char data_write[2];
-   data_write[0] = subAddress;
-   data_write[1] = data;
-   i2c.write(address, data_write, 2, 0);
-}
-
-    char readByte(uint8_t address, uint8_t subAddress)
-{
-    char data[1]; // `data` will store the register data     
-    char data_write[1];
-    data_write[0] = subAddress;
-    i2c.write(address, data_write, 1, 1); // no stop
-    i2c.read(address, data, 1, 0); 
-    return data[0]; 
-}
-
-    void readBytes(uint8_t address, uint8_t subAddress, uint8_t count, uint8_t * dest)
-{     
-    char data[14];
-    char data_write[1];
-    data_write[0] = subAddress;
-    i2c.write(address, data_write, 1, 1); // no stop
-    i2c.read(address, data, count, 0); 
-    for(int ii = 0; ii < count; ii++) {
-     dest[ii] = data[ii];
-    }
-} 
- 
-
-// Stores all of the BMP180's calibration values into global variables
-// Calibration values are required to calculate temp and pressure
-// This function should be called at the beginning of the program
-// These BMP-180 functions were adapted from Jim Lindblom of SparkFun Electronics
-void BMP180Calibration()
-{
-  ac1 = readByte(BMP180_ADDRESS, 0xAA) << 8 | readByte(BMP180_ADDRESS, 0xAB);
-  ac2 = readByte(BMP180_ADDRESS, 0xAC) << 8 | readByte(BMP180_ADDRESS, 0xAD);
-  ac3 = readByte(BMP180_ADDRESS, 0xAE) << 8 | readByte(BMP180_ADDRESS, 0xAF);
-  ac4 = readByte(BMP180_ADDRESS, 0xB0) << 8 | readByte(BMP180_ADDRESS, 0xB1);
-  ac5 = readByte(BMP180_ADDRESS, 0xB2) << 8 | readByte(BMP180_ADDRESS, 0xB3);
-  ac6 = readByte(BMP180_ADDRESS, 0xB4) << 8 | readByte(BMP180_ADDRESS, 0xB5);
-  b1  = readByte(BMP180_ADDRESS, 0xB6) << 8 | readByte(BMP180_ADDRESS, 0xB7);
-  b2  = readByte(BMP180_ADDRESS, 0xB8) << 8 | readByte(BMP180_ADDRESS, 0xB9);
-  mb  = readByte(BMP180_ADDRESS, 0xBA) << 8 | readByte(BMP180_ADDRESS, 0xBB);
-  mc  = readByte(BMP180_ADDRESS, 0xBC) << 8 | readByte(BMP180_ADDRESS, 0xBD);
-  md  = readByte(BMP180_ADDRESS, 0xBE) << 8 | readByte(BMP180_ADDRESS, 0xBF);
-}
-
-  // Temperature returned will be in units of 0.1 deg C
-  int16_t BMP180GetTemperature()
-  {
-  int16_t ut = 0;
-  writeByte(BMP180_ADDRESS, 0xF4, 0x2E); // start temperature measurement
-  wait(0.005);
-  uint8_t rawData[2] = {0, 0};
-  readBytes(BMP180_ADDRESS, 0xF6, 2, &rawData[0]); // read raw temperature measurement
-  ut = (((int16_t) rawData[0] << 8) | rawData[1]);
- 
- long x1, x2;
-  
-  x1 = (((long)ut - (long)ac6)*(long)ac5) >> 15;
-  x2 = ((long)mc << 11)/(x1 + md);
-  b5 = x1 + x2;
-
-  return  ((b5 + 8)>>4);  
-}
-
-// Calculate pressure read calibration values  
-// b5 is also required so BMP180GetTemperature() must be called first.
-// Value returned will be pressure in units of Pa.
-long BMP180GetPressure()
-{
-  long up = 0;
-  writeByte(BMP180_ADDRESS, 0xF4, 0x34 | OSS << 6); // Configure pressure measurement for highest resolution
-  wait((5.0f + 8.0f*3.0f)/1000.0f); // delay 5 ms at lowest resolution, 29 ms at highest
-  uint8_t rawData[3] = {0, 0, 0};
-  readBytes(BMP180_ADDRESS, 0xF6, 3, &rawData[0]); // read raw pressure measurement of 19 bits
-  up = (((long) rawData[0] << 16) | ((long)rawData[1] << 8) | rawData[2]) >> (8 - OSS);
-
-  long x1, x2, x3, b3, b6, p;
-  unsigned long b4, b7;
-  
-  b6 = b5 - 4000;
-  // Calculate B3
-  x1 = (b2 * (b6 * b6)>>12)>>11;
-  x2 = (ac2 * b6)>>11;
-  x3 = x1 + x2;
-  b3 = (((((long)ac1)*4 + x3)<<OSS) + 2)>>2;
-  
-  // Calculate B4
-  x1 = (ac3 * b6)>>13;
-  x2 = (b1 * ((b6 * b6)>>12))>>16;
-  x3 = ((x1 + x2) + 2)>>2;
-  b4 = (ac4 * (unsigned long)(x3 + 32768))>>15;
-  
-  b7 = ((unsigned long)(up - b3) * (50000>>OSS));
-  if (b7 < 0x80000000)
-    p = (b7<<1)/b4;
-  else
-    p = (b7/b4)<<1;
-    
-  x1 = (p>>8) * (p>>8);
-  x1 = (x1 * 3038)>>16;
-  x2 = (-7357 * p)>>16;
-  p += (x1 + x2 + 3791)>>4;
-  
-  return p;
-}      
-
- 
- 
-  };
-#endif
\ No newline at end of file