Diff: MCP3425.cpp

Revision:

1:5ac344aa0aac

Parent:

0:b7bc51be525f

Child:

2:7375e645e806

--- a/MCP3425.cpp	Wed Oct 15 14:37:59 2014 +0000
+++ b/MCP3425.cpp	Tue Apr 12 14:56:07 2016 +0000
@@ -13,6 +13,8 @@
 #include "mbed.h"
 #include "MCP3425.h"
 
+const float MCP3425::VREF = 2.048;
+
 MCP3425::MCP3425 (PinName sda, PinName scl) : _i2c(sda, scl) {
     init();
 }
@@ -23,14 +25,29 @@
 
 short MCP3425::get()
 {
-
     _i2c.read( MCP3425_ADDR, buf, 3);
 
     ad.byte.HB=buf[0];
     ad.byte.LB=buf[1];
     config.UC=buf[2];
     return ad.S;
+}
+
+float MCP3425::read()
+{
+    int gain = 1;
+    if (config.bit.G == 0) gain = 1;
+    else if (config.bit.G == 1) gain = 2;
+    else if (config.bit.G == 2) gain = 4;
+    else if (config.bit.G == 3) gain = 8;
+
+    int maxcode = 2047;
+    if (config.bit.S == 0 ) maxcode = 2047;
+    else if (config.bit.S == 1 ) maxcode = 8191;
+    else if (config.bit.S == 2 ) maxcode = 32767;
  
+    short code = get();   
+    return code * VREF / gain / ( maxcode + 1 ); 
 }