Diff: main.cpp

Revision:

0:2fdc6095d7b4

Child:

1:d01abb5e6f52

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Sep 07 07:27:01 2011 +0000
@@ -0,0 +1,57 @@
+#include "mbed.h"
+
+DigitalOut myled(LED1);
+
+// http://sensing.honeywell.com/index.cfm/ci_id/157750/la_id/1/document/1/re_id/0
+// http://sensing.honeywell.com/index.cfm/ci_id/156988/la_id/1/document/1/re_id/0
+
+#define HSC_2A 0x28
+
+int main() {
+
+// BMP085 bmp085(p28, p27); //bmp085(p9, p10); // sda, scl
+
+    printf("\rhsc\n\r");
+
+    I2C i2c(p28, p27);
+    
+    int id = HSC_2A;
+
+    i2c.frequency(100000); // 100k - 400k
+
+    while(1) {
+
+#if 0    
+        i2c.start();
+        i2c.write((id<<1) | 1);
+        int b1 = i2c.read(1);
+        int b2 = i2c.read(1);
+        int t1 = i2c.read(1);
+        int t2 = i2c.read(0);
+        i2c.stop();
+        printf("%02X %02X  %02X %02X\n\r", b1, b2, t1, t2);
+#else
+        unsigned char data[4];
+        i2c.read((id<<1)|1, (char*)data, sizeof(data));
+        //printf("%02X %02X  %02X %02X\n\r", data[0], data[1], data[2], data[3]);
+        int st = data[0]>>6; // status
+        int bd = ((data[0] & 0x3f) << 8) | data[1]; // bridge data
+        int td = ((data[2]<<8) | data[3]) >> 5; // temp data
+        
+        float p = ((float)bd-1638)*(15-0)/(14745-1638)-0; // convert to psi
+        p = p * 68.9475729; // psi to hPa
+        
+        float t = (((float)td*200)/2047)-50; // convert to deg C
+        printf("%d: %.2f hPa  %.2f C\n\r", st, p, t);
+        
+        wait(1);
+#endif    
+
+        myled = 1;
+        wait(0.2);
+        myled = 0;
+        wait(0.2);
+        
+    } // while
+    
+} // main