Revision 0:ad2afb285975, committed 2011-10-14

Comitter:

bouaziz

Date:

Fri Oct 14 18:44:39 2011 +0000

Commit message:

v1

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BMP085.h	Fri Oct 14 18:44:39 2011 +0000
@@ -0,0 +1,56 @@
+/*
+  * mbed library to use a Bosch Sensortec BMP085 sensor
+  * Copyright (c) 2010 Hiroshi Suga
+  * Released under the MIT License: http://mbed.org/license/mit
+  */
+  
+ /** @file BMP085.h
+  * @brief mbed library to use a Bosch Sensortec BMP085 sensor
+  * barometric pressure sensor BMP085 (Bosch Sensortec)
+  * interface: I2C digital
+  */
+  
+ #ifndef BMP085_H
+ #define BMP085_H
+ 
+ #include "mbed.h"
+ 
+ /**
+  * @brief over sampling setting
+  */
+ enum BMP085_oss {
+     BMP085_oss1 = 0, ///< ultra low power (1 time)
+     BMP085_oss2 = 1, ///< standard (2 times)
+     BMP085_oss4 = 2, ///< high resolution (4 times)
+     BMP085_oss8 = 3  ///< ultra high resolution (8 times)
+ };
+ 
+ /**
+  * @brief BMP085 class
+  */
+ class BMP085 : public Base {
+ public:
+     BMP085(PinName p_sda, PinName p_scl, BMP085_oss p_oss = BMP085_oss1);
+     BMP085(I2C& p_i2c, BMP085_oss p_oss = BMP085_oss1);
+ 
+     float get_temperature();
+     float get_pressure();
+     void update();
+ 
+ protected:
+     void init(BMP085_oss);
+     unsigned short twi_readshort (int, int);
+     unsigned long twi_readlong (int, int);
+     void twi_writechar (int, int, int);
+ 
+     I2C i2c;
+     float temperature;
+     float pressure;
+ 
+ private:
+ 
+     short ac1, ac2, ac3, b1, b2, mb, mc, md, oss;
+     unsigned short ac4, ac5, ac6;
+ };
+ 
+ #endif
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BMP085_sam.cpp	Fri Oct 14 18:44:39 2011 +0000
@@ -0,0 +1,152 @@
+/*
+   * mbed library to use a Bosch Sensortec BMP085 sensor
+   * Copyright (c) 2010 Hiroshi Suga
+   * Released under the MIT License: http://mbed.org/license/mit
+   */
+  
+  /** @file BMP085.cpp
+   * @brief mbed library to use a Bosch Sensortec BMP085 sensor
+   * barometric pressure sensor BMP085 (Bosch Sensortec)
+   * interface: I2C digital
+   */
+  
+  #include "mbed.h"
+  #include "BMP085.h"
+  
+  #define WEATHER_BMP085 0xee
+  #define xpow(x, y) ((long)1 << y)
+  
+  /**
+   * @brief Initializes interface (private I2C)
+   * @param p_sda port of I2C SDA
+   * @param p_scl port of I2C SCL
+   * @param p_oss parameter of OSS
+   */
+  BMP085::BMP085 (PinName p_sda, PinName p_scl, BMP085_oss p_oss) : i2c(p_sda, p_scl) {
+      init(p_oss);
+  }
+  
+  /**
+   * @brief Initializes interface (public I2C)
+   * @param p_i2c instance of I2C class
+   * @param p_oss parameter of OSS
+   */
+  BMP085::BMP085 (I2C& p_i2c, BMP085_oss p_oss) : i2c(p_i2c) { 
+      init(p_oss);
+  }
+  
+  /**
+   * @brief Get temperature
+   * @return temperature (`C)
+   */
+  float BMP085::get_temperature() {
+      return temperature;
+  }
+  
+  /**
+   * @brief Get pressure
+   * @return pressure (hPa)
+   */
+  float BMP085::get_pressure() {
+      return pressure;
+  }
+  
+  /**
+   * @brief Update results
+   */
+  void BMP085::update () {
+      long t, p, ut, up, x1, x2, x3, b3, b5, b6;
+      unsigned long b4, b7;
+  
+      twi_writechar(WEATHER_BMP085, 0xf4, 0x2e);
+      wait(0.01);
+      ut = twi_readshort(WEATHER_BMP085, 0xf6);
+  
+      twi_writechar(WEATHER_BMP085, 0xf4, 0x34 | (oss << 6));
+      wait(0.05);
+      up = twi_readlong(WEATHER_BMP085, 0xf6) >> (8 - oss);
+  
+      x1 = ((ut - ac6) * ac5) / xpow(2, 15);
+      x2 = ((long)mc * xpow(2, 11)) / (x1 + md);
+      b5 = x1 + x2;
+      t = (b5 + 8) / xpow(2, 4);
+      temperature = (float)t / 10.0;
+  
+      b6 = b5 - 4000;
+      x1 = (b2 * (b6 * b6 / xpow(2, 12))) / xpow(2, 11);
+      x2 = (ac2 * b6) / xpow(2, 11);
+      x3 = x1 + x2;
+      b3 = ((((unsigned long)ac1 * 4 + x3) << oss) + 2) / 4;
+      x1 = ac3 * b6 / xpow(2, 13);
+      x2 = (b1 * (b6 * b6 / xpow(2, 12))) / xpow(2, 16);
+      x3 = ((x1 + x2) + 2) / xpow(2, 2);
+      b4 = (ac4 * (unsigned long)(x3 + 32768)) / xpow(2, 15);
+      b7 = ((unsigned long)up - b3) * (50000 >> oss);
+      if (b7 < (unsigned long)0x80000000) {
+          p = (b7 * 2) / b4;
+      } else {
+          p = (b7 / b4) * 2;
+      }
+      x1 = (p / xpow(2, 8)) * (p / xpow(2, 8));
+      x1 = (x1 * 3038) / xpow(2, 16);
+      x2 = (-7357 * p) / xpow(2, 16);
+      p = p + (x1 + x2 + 3791) / xpow(2, 4);
+      pressure = (float)p / 100.0;
+  }
+  
+  void BMP085::init (BMP085_oss p_oss) {
+      ac1 = twi_readshort(WEATHER_BMP085, 0xaa);
+      ac2 = twi_readshort(WEATHER_BMP085, 0xac);
+      ac3 = twi_readshort(WEATHER_BMP085, 0xae);
+      ac4 = twi_readshort(WEATHER_BMP085, 0xb0);
+      ac5 = twi_readshort(WEATHER_BMP085, 0xb2);
+      ac6 = twi_readshort(WEATHER_BMP085, 0xb4);
+      b1 = twi_readshort(WEATHER_BMP085, 0xb6);
+      b2 = twi_readshort(WEATHER_BMP085, 0xb8);
+      mb = twi_readshort(WEATHER_BMP085, 0xba);
+      mc = twi_readshort(WEATHER_BMP085, 0xbc);
+      md = twi_readshort(WEATHER_BMP085, 0xbe);
+      oss = p_oss;
+  }
+  
+  unsigned short BMP085::twi_readshort (int id, int addr) {
+      unsigned short i;
+  
+      i2c.start();
+      i2c.write(id);
+      i2c.write(addr);
+  
+      i2c.start();
+      i2c.write(id | 1);
+      i = i2c.read(1) << 8;
+      i |= i2c.read(0);
+      i2c.stop();
+  
+      return i;
+  }
+  
+  unsigned long BMP085::twi_readlong (int id, int addr) {
+      unsigned long i;
+  
+      i2c.start();
+      i2c.write(id);
+      i2c.write(addr);
+  
+      i2c.start();
+      i2c.write(id | 1);
+      i = i2c.read(1) << 16;
+      i |= i2c.read(1) << 8;
+      i |= i2c.read(0);
+      i2c.stop();
+  
+      return i;
+  }
+  
+  void BMP085::twi_writechar (int id, int addr, int dat) {
+  
+      i2c.start();
+      i2c.write(id);
+      i2c.write(addr);
+      i2c.write(dat);
+      i2c.stop();
+  }
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Oct 14 18:44:39 2011 +0000
@@ -0,0 +1,58 @@
+#include "mbed.h"
+#include "BMP085.h"
+#include "string.h"
+
+BMP085 bmp085(p9, p10);
+
+DigitalOut myled(LED1);
+DigitalOut myled4(LED4);
+Serial pc(USBTX, USBRX);
+
+LocalFileSystem local("local");
+
+int main() {
+    float p, t;
+    int ii=0;
+    char pname[12],stval[6];
+    DIR *d = opendir("/local");               // Opens the root directory of the local file system
+    struct dirent *pdir;
+    int indice=1;
+    while((pdir = readdir(d)) != NULL) {         // Print the names of the files in the local file system
+       pc.printf("%u  %s\r",indice, pdir->d_name);
+      if(strstr(pdir->d_name,"OUT")== pdir->d_name) {
+           indice++;
+      }
+    }
+    closedir(d);
+    strcpy(pname,"/local/out");
+    sprintf(stval,"%02u",indice);
+    strcat(pname,stval);
+    strcat(pname,".txt");
+    
+    FILE *fp = fopen(pname, "w");  // Open "out.txt" on the local file system for writing
+    myled4=0;
+    while(1) {
+        myled = 1;
+
+        bmp085.update();
+        p = bmp085.get_pressure();
+        t = bmp085.get_temperature();
+//        if(t>24.0){
+//            myled4=1;    
+//        }else{
+//            myled4=0;
+//        }
+        pc.printf("p:%6.2f hPa / t:%6.2f C\r", p, t);
+        
+        if(ii<60){
+           ii=ii+1;
+           fprintf(fp,"p:%6.2f hPa / t:%6.2f C\r", p, t);
+        }else{
+            fclose(fp);
+            myled4=1;    
+        }    
+
+        myled = 0;
+        wait(0.5);
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Fri Oct 14 18:44:39 2011 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/63bcd7ba4912