Diff: Si7021.cpp

Revision:

0:d3514bc63a39

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Si7021.cpp	Fri Jan 22 08:56:27 2016 +0000
@@ -0,0 +1,52 @@
+#include "Si7021.h"
+
+Si7021::Si7021(PinName sda, PinName scl):i2c(sda, scl)
+{
+    i2c.frequency(FREQ);
+}
+
+Si7021::~Si7021()
+{
+    
+}
+
+int32_t Si7021::get_temperature()
+{
+    return tData;
+}
+
+uint32_t Si7021::get_humidity()
+{
+    return rhData;
+}
+
+bool Si7021::measure()
+{
+    tx_buff[0] = READ_RH;
+    if(i2c.write(ADDR, (char*)tx_buff, 1) != 0) return 0;
+    if(i2c.read(ADDR, (char*)rx_buff, 2) != 0) return 0;
+    
+    rhData = ((uint32_t)rx_buff[0] << 8) + (rx_buff[1] & 0xFC);
+    rhData = (((rhData) * 15625L) >> 13) - 6000;
+    
+    tx_buff[0] = READ_TEMP;
+    if(i2c.write(ADDR, (char*)tx_buff, 1) != 0) return 0;
+    if(i2c.read(ADDR, (char*)rx_buff, 2) != 0) return 0;
+    
+    tData = ((uint32_t)rx_buff[0] << 8) + (rx_buff[1] & 0xFC);
+    tData = (((tData) * 21965L) >> 13) - 46850;
+    
+    return 1;
+}
+
+bool Si7021::check()
+{
+    tx_buff[0] = READ_ID2_1;
+    tx_buff[1] = READ_ID2_2;
+    if(i2c.write(ADDR, (char*)tx_buff, 2) != 0) return 0;
+    if(i2c.read(ADDR, (char*)rx_buff, 8) != 0) return 0;
+    
+    if(rx_buff[0] == DEVICE_ID)
+        return true;
+    else return 0;
+}
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