Jim Carver / AnalogIn_Diff

A basic Library for the 16 bit Differential A/D in the K64F Freedom platform

Dependents:   K64F_DIFF_A2D

This Library cn use either A2D0 or 1. Note that when using A2D0 you must use pins ADC0_DP1 and ADC0_DM1. For A2D1 you must use pins ADC1_DP1 and ADC1_DM1.

AnalohIn_Diff.cpp@1:7b36e4381d83, 2014-05-22 (annotated)

Committer:
JimCarver
Date:
Thu May 22 17:40:21 2014 +0000
Revision:
1:7b36e4381d83
Parent:
0:0f6f4be28e21 
Now supports either Channel 0 or 1 for both ADC0 & ADC1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JimCarver 0:0f6f4be28e21 1 #include "mbed.h"
JimCarver 0:0f6f4be28e21 2 #include "AnalogIn_Diff.h"
JimCarver 0:0f6f4be28e21 3
JimCarver 0:0f6f4be28e21 4
JimCarver 1:7b36e4381d83 5 AnalogIn_Diff::AnalogIn_Diff(int a2d_number) : ch(a2d_number) {
JimCarver 1:7b36e4381d83 6 if(ch) BW_SIM_SCGC3_ADC1(1); // Turn on clock as needed
JimCarver 0:0f6f4be28e21 7 else BW_SIM_SCGC6_ADC0(1);
JimCarver 1:7b36e4381d83 8 BW_ADC_SC1n_DIFF(ch, 0, 1); // Differential Mode
JimCarver 1:7b36e4381d83 9 BW_ADC_CFG1_ADICLK(ch, 0); // Bus Clock
JimCarver 1:7b36e4381d83 10 BW_ADC_CFG1_MODE(ch, 3); // 16Bit differential mode
JimCarver 1:7b36e4381d83 11 BW_ADC_CFG1_ADLSMP(ch, 0); // Short Sample Window
JimCarver 1:7b36e4381d83 12 BW_ADC_CFG1_ADIV(ch, 3); // Clock / 8
JimCarver 1:7b36e4381d83 13 BW_ADC_CFG1_ADLPC(ch, 0); // Normal Power Mode
JimCarver 0:0f6f4be28e21 14 }
JimCarver 0:0f6f4be28e21 15
JimCarver 0:0f6f4be28e21 16 AnalogIn_Diff::~AnalogIn_Diff() { }
JimCarver 0:0f6f4be28e21 17
JimCarver 1:7b36e4381d83 18 int16_t AnalogIn_Diff::read_16(int channel) { // Returns a 16bit signed integer
JimCarver 1:7b36e4381d83 19 BW_ADC_SC1n_ADCH(ch, 0, channel); // Trigger Conversion
JimCarver 1:7b36e4381d83 20 while(!BR_ADC_SC1n_COCO(ch, 0)); // Wait for conversion to finish
JimCarver 1:7b36e4381d83 21 return(BR_ADC_Rn_D(ch, 0)); // Return the result
JimCarver 0:0f6f4be28e21 22 }
JimCarver 0:0f6f4be28e21 23
JimCarver 1:7b36e4381d83 24 float AnalogIn_Diff::read(int channel) {
JimCarver 0:0f6f4be28e21 25 int16_t i;
JimCarver 0:0f6f4be28e21 26 float t;
JimCarver 1:7b36e4381d83 27 BW_ADC_SC1n_ADCH(ch, 0, channel);
JimCarver 0:0f6f4be28e21 28 while(!BR_ADC_SC1n_COCO(ch, 0));
JimCarver 0:0f6f4be28e21 29 i = BR_ADC_Rn_D(ch, 0);
JimCarver 0:0f6f4be28e21 30 t = ((float) i);
JimCarver 0:0f6f4be28e21 31 t = t / 32768.0f;
JimCarver 0:0f6f4be28e21 32 return(t);
JimCarver 0:0f6f4be28e21 33 }