Diff: main.cpp

Revision:

0:eac725262a54

diff -r 000000000000 -r eac725262a54 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed May 29 08:02:17 2013 +0000
@@ -0,0 +1,26 @@
+#include "mbed.h"
+#define c2f(h, l, n, e) float(short(h << 8| 1)) / (1 << 16 - n + e)
+
+int main() {
+    I2C i2c(p28, p27);
+    char id = 0x60 << 1, data[16];
+    
+    data[0] = 0x12, data[1] = 0x01;
+    i2c.write(id, data, 2);
+    wait_ms(1);
+    
+    data[0] = 0;
+    i2c.write(id, data, 1, true);
+    i2c.read(id, data, 16);
+    float padc = data[0] << 2 | data[1] >> 6;
+    float tadc = data[2] << 2 | data[3] >> 6;
+    float a0 = c2f(data[4], data[5], 16, 3);
+    float b1 = c2f(data[6], data[7], 16, 13);
+    float b2 = c2f(data[8], data[9], 16, 14);
+    float c12 = c2f(data[10], data[11], 14, 22);
+    float c11 = c2f(data[12], data[13], 11, 21);
+    float c22 = c2f(data[14], data[15], 11, 25);
+    float pcomp = a0 + (b1 + c11 * padc + c12 * tadc) * padc + (b2 + c22 * tadc) * tadc;
+    
+    printf("pressure = %4.0f hpa\n", pcomp * 650 / 1023 + 500);    
+}