Diff: uvis25.cpp

Revision:

0:8d05f1ced202

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/uvis25.cpp	Fri Jun 17 01:55:11 2016 +0000
@@ -0,0 +1,66 @@
+/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.
+ *
+ * The information contained herein is property of Nordic Semiconductor ASA.
+ * Terms and conditions of usage are described in detail in NORDIC
+ * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
+ *
+ * Licensees are granted free, non-transferable use of the information. NO
+ * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
+ * the file.
+ *df
+ */
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <mbed.h>
+#include "uvis25.h"
+
+I2C i2c_uvi(p22, p20);    //SDA, SCL
+
+static const char uvis25_expected_who_am_i = 0xCAU; //!< Expected value to get from WHO_AM_I register.
+
+bool uvis25_init(void)
+{   
+  bool transfer_succeeded = true;
+
+  i2c_uvi.frequency(400000);
+    uvis25_register_write(0x20 , 0x01); 
+                                
+  // Read and verify product ID
+  transfer_succeeded &= uvis25_verify_product_id();
+
+  return transfer_succeeded;
+}
+
+bool uvis25_verify_product_id(void)
+{
+    char who_am_i[1];
+    uvis25_register_read(UVIS25_ADDRESS_WHO_AM_I, &who_am_i[0], 1);
+    if (who_am_i[0] != uvis25_expected_who_am_i) return false;
+    else return true;
+}
+
+void uvis25_register_write(uint8_t register_address, uint8_t value)
+{   
+    char w2_data[2];
+    
+    w2_data[0] = register_address;
+    w2_data[1] = value;
+    i2c_uvi.write(UVIS25_WriteADDE, w2_data, 2);      
+
+}
+
+void uvis25_register_read(char register_address, char *destination, uint8_t number_of_bytes)
+{
+  i2c_uvi.write(UVIS25_WriteADDE, &register_address, 1, 1);
+  i2c_uvi.read(UVIS25_WriteADDE, destination, number_of_bytes);  
+}
+               
+    
+uint8_t UVIS25_ReadUVI(void)
+{
+    char UVI_reading;
+    uvis25_register_read(0x28, &UVI_reading, 1);
+    return (uint8_t) UVI_reading;
+}