Revision 0:2005beefb93e, committed 2011-10-17
- Comitter:
- gbeardall
- Date:
- Mon Oct 17 10:41:08 2011 +0000
- Commit message:
Changed in this revision
diff -r 000000000000 -r 2005beefb93e BMP085/BMP085.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/BMP085/BMP085.cpp Mon Oct 17 10:41:08 2011 +0000
@@ -0,0 +1,125 @@
+/*
+ * mbed library to use a Bosch Sensortec BMP085 sensor
+ * Copyright (c) 2010 Hiroshi Suga
+ * Released under the MIT License: http://mbed.org/license/mit
+ */
+
+#include "mbed.h"
+#include "BMP085.h"
+
+#define WEATHER_BMP085 0xee
+#define xpow(x, y) ((long)1 << y)
+
+
+BMP085::BMP085 (PinName p_sda, PinName p_scl, BMP085_oss p_oss) : i2c(p_sda, p_scl) {
+ init(p_oss);
+}
+
+BMP085::BMP085 (I2C& p_i2c, BMP085_oss p_oss) : i2c(p_i2c) {
+ init(p_oss);
+}
+
+float BMP085::get_temperature() {
+ return temperature;
+}
+
+float BMP085::get_pressure() {
+ return pressure;
+}
+
+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();
+}
diff -r 000000000000 -r 2005beefb93e BMP085/BMP085.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/BMP085/BMP085.h Mon Oct 17 10:41:08 2011 +0000
@@ -0,0 +1,44 @@
+/*
+ * mbed library to use a Bosch Sensortec BMP085 sensor
+ * Copyright (c) 2010 Hiroshi Suga
+ * Released under the MIT License: http://mbed.org/license/mit
+ */
+
+#ifndef BMP085_H
+#define BMP085_H
+
+#include "mbed.h"
+
+enum BMP085_oss {
+ BMP085_oss1 = 0,
+ BMP085_oss2 = 1,
+ BMP085_oss4 = 2,
+ BMP085_oss8 = 3
+};
+
+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
diff -r 000000000000 -r 2005beefb93e main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Mon Oct 17 10:41:08 2011 +0000
@@ -0,0 +1,20 @@
+#include "mbed.h"
+#include "BMP085.h"
+
+BMP085 bmp085(p28, p27); //bmp085(p9, p10); // sda, scl
+
+
+DigitalOut myled(LED1);
+Serial pc(USBTX, USBRX);
+
+int main() {
+ while(1) {
+ myled = 1;
+
+ bmp085.update();
+ pc.printf("p:%6.2f hPa / t:%6.2f C\n\r", bmp085.get_pressure(), bmp085.get_temperature());
+
+ myled = 0;
+ wait(3);
+ }
+}
diff -r 000000000000 -r 2005beefb93e mbed.bld
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld Mon Oct 17 10:41:08 2011 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e
gavin beardall