Diff: ENVIROMENTAL/SI7021.cpp

Revision:

0:f8a9cceb4186

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ENVIROMENTAL/SI7021.cpp	Mon Jun 10 12:50:02 2019 +0000
@@ -0,0 +1,48 @@
+#include "SI7021.h"
+
+SI7021::SI7021(PinName sda, PinName scl):i2c(sda, scl)
+{
+    i2c.frequency(FREQ);
+}
+
+int32_t SI7021::get_temperature()
+{
+    return tempData;
+}
+
+
+uint32_t SI7021::get_humidity()
+{
+    return humData;
+}
+
+bool SI7021::get_data()
+{
+    buff_tx[0] = READ_HUM  ;
+    if(i2c.write(ADDR, (char*)buff_tx, 1) != 0) return 0;
+    if(i2c.read(ADDR, (char*)buff_rx, 2) != 0) return 0;
+
+    humData = ((uint32_t)buff_rx[0] << 8) + (buff_rx[1] & 0xFC);
+    humData = (((humData) * 15625L) >> 13) - 6000;
+
+    buff_tx[0] = READ_TEMP;
+    if(i2c.write(ADDR, (char*)buff_tx, 1) != 0) return 0;
+    if(i2c.read(ADDR, (char*)buff_rx, 2) != 0) return 0;
+
+    tempData = ((uint32_t)buff_rx[0] << 8) + (buff_rx[1] & 0xFC);
+    tempData = (((tempData) * 21965L) >> 13) - 46850;
+
+    return 1;
+}
+
+bool SI7021::check()
+{
+    buff_tx[0] = READ_ID2_1;
+    buff_tx[1] = READ_ID2_2;
+    if(i2c.write(ADDR, (char*)buff_tx, 2) != 0) return 0;
+    if(i2c.read(ADDR, (char*)buff_rx, 8) != 0) return 0;
+
+    if(buff_rx[0] == DEVICE_ID)
+        return true;
+    else return 0;
+}