Diff: BH1750.cpp

Revision:

0:be50fe376e4f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BH1750.cpp	Thu Sep 08 14:05:53 2016 +0000
@@ -0,0 +1,72 @@
+/*
+
+This is a library for the BH1750FVI (GY-30) Digital Light Sensor
+breakout board.
+
+The board uses I2C for communication. 2 pins are required to
+interface to the device and in most cases also pull up resistors.
+
+Datasheet:
+http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1750fvi-e.pdf
+
+Inspired by Christopher Laws, March, 2013.
+Written by Michal Stehlik, August, 2014.
+
+*/
+
+#include "BH1750.h"
+
+BH1750::BH1750(PinName sda, PinName scl) : i2c(sda,scl)
+{
+    rawDataBuffer[0] = 0;
+    rawDataBuffer[1] = 0;
+    status = -1;
+}
+
+void BH1750::init(char mode)
+{
+    configure(mode);
+}
+
+
+void BH1750::configure(char mode)
+{
+    char data[1];
+    switch (mode) {
+        case BH1750_CONTINUOUS_HIGH_RES_MODE:
+        case BH1750_CONTINUOUS_HIGH_RES_MODE_2:
+        case BH1750_CONTINUOUS_LOW_RES_MODE:
+        case BH1750_ONE_TIME_HIGH_RES_MODE:
+        case BH1750_ONE_TIME_HIGH_RES_MODE_2:
+        case BH1750_ONE_TIME_LOW_RES_MODE:
+            data[0] = mode;
+            status = i2c.write(BH1750_I2CADDR, data, sizeof(data), false);
+            wait_ms(10);
+            break;
+        default:
+            break;
+    }
+}
+
+
+float BH1750::readIntensity(void)
+{
+    status = i2c.read(BH1750_I2CADDR, rawDataBuffer, 2, false);
+    if(status != 0) {
+        return -1;
+    }
+    //success
+    float result = 0;
+    result = ((rawDataBuffer[0]<<8)|rawDataBuffer[1])/1.2;
+    return result;
+}
+
+int BH1750::getStatus(void)
+{
+    return status;
+}
+
+char* BH1750::getRawData(void)
+{
+    return rawDataBuffer;
+}