Diff: mbed-OPT3001/OPT3001.cpp

Revision:

0:33cb2fa095df

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-OPT3001/OPT3001.cpp	Mon Feb 12 05:06:24 2018 +0000
@@ -0,0 +1,56 @@
+#include "OPT3001.h"
+#include "SEGGER_RTT.h"
+
+uint16_t deviceID = 0;
+uint16_t sensor_data = 0;
+float sensor_data1 = 0.0;
+char temp_write[3] = {0,0,0};
+float lux_multiplier = 10.24; //Range set to RN[3:0] = 1010 in config register. Refer datasheet for lux_multiplier options.
+
+//I2C peripheral pins on the STM32F7-DISCOVERY & NUCLEO_F429ZI board.
+I2C i2c(p21, p23);
+
+  //Read Device ID
+void read_DeviceID() {
+    temp_write[0] = 0x7F; //device ID register address from datasheet
+    char data[2] = {0,0};
+    i2c.write(address, temp_write, 1, false);
+    int b = i2c.read(address, data, 2, 0);
+    SEGGER_RTT_printf(0, "b ======= =  == == %d", b);
+    deviceID = (((uint16_t)data[0]) << 8) | data[1];
+    SEGGER_RTT_printf(0, "Device ID= %d\n", deviceID);
+    if(deviceID == 0x3001) { //12289d (3001h) = device ID from datasheet. Factory programmed.
+        SEGGER_RTT_printf(0, "I2C Device ID OK.....");      
+   }
+ }
+    
+
+float read_sensor() {
+
+    SEGGER_RTT_printf(0, "Inside read sensor..");
+    i2c.frequency(400000);
+    //Configure light sensor
+    temp_write[0]=0x01;
+    temp_write[1]=0xAE; //C810h is the default content for configuration register (address=01h) (Current cofig = AE0C)
+    temp_write[2]=0x0C;
+    
+    int a = i2c.write(address, temp_write, 3, 0);
+    SEGGER_RTT_printf(0, "a ====== %d",a);
+
+    //From datasheet: Read result register (mask bits 15:13 - AND with suitable mask) & Multiply contents by 
+    //lux_multiply factor to get reading. This configuration of the sensor is achieved because of the exponent in the configuration
+    //register being set to 0's.
+//    while(1) {
+        temp_write[0] = 0x00; //result register address
+        char opt_data[2] = {0,0};
+        i2c.write(address, temp_write, 1, false);
+        int c = i2c.read(address, opt_data, 2, 0);
+        SEGGER_RTT_printf(0, "opt_data[1] ==== %d\t", opt_data[1]);
+        SEGGER_RTT_printf(0, "opt_data[0] ==== %d\t", opt_data[0]);
+        sensor_data1 = ((((uint16_t)opt_data[0]) << 8) | opt_data[1]) & 0x1FFF;
+        SEGGER_RTT_printf(0, "Sensor data = %0.2f\n", sensor_data1);
+        sensor_data1 = sensor_data1 * lux_multiplier;
+        SEGGER_RTT_printf(0, "Lux data = %f\n", sensor_data1);
+//    }
+    return sensor_data1;
+}