Diff: AM2321.cpp

Revision:

0:3656aea4e6f6

Child:

1:39f20504d5c5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AM2321.cpp	Wed Oct 08 02:48:36 2014 +0000
@@ -0,0 +1,61 @@
+//**********************
+// AM2321.cpp for mbed
+//
+// AM2321 am2321(P0_5,P0_4);
+// or
+// I2C i2c(P0_5,P0_4);
+// AM2321 am2321(i2c);
+//
+// (C)Copyright 2014 All rights reserved by Y.Onodera
+// http://einstlab.web.fc2.com
+//**********************
+
+#include "mbed.h"
+#include "AM2321.h"
+
+AM2321::AM2321 (PinName sda, PinName scl) : _i2c(sda, scl) {
+}
+AM2321::AM2321 (I2C& p_i2c) : _i2c(p_i2c) {
+}
+
+
+void AM2321::get()
+{
+    // step 1:wakeup
+    _i2c.write(AM2321_ADDR, NULL, 0);
+    wait_us(800);   // 800us - 3ms
+
+    // step 2:command
+    buf[0] = 0x03;  // Get Humidity and Temperature
+    buf[1] = 0x00;  // Start address
+    buf[2] = 0x04;  // Length
+    _i2c.write(AM2321_ADDR, buf, 3);
+    wait_us(1500);  // 1.5ms
+
+    // step 3:data
+    _i2c.read( AM2321_ADDR, buf, 8);
+
+}
+
+int AM2321::humidity()
+{
+
+    // get hum
+    get();
+    hum.byte.HB=buf[2];
+    hum.byte.LB=buf[3];
+    return hum.Val;
+    
+}
+
+int AM2321::temperature()
+{
+
+    // get temp
+    get();
+    temp.byte.HB=buf[4];
+    temp.byte.LB=buf[5];
+    return temp.Val;
+    
+}
+