AnalohIn_Diff.cpp

00001 #include "mbed.h"
00002 #include "AnalogIn_Diff.h"
00003 
00004 
00005 AnalogIn_Diff::AnalogIn_Diff(int a2d_number) : ch(a2d_number) {
00006     if(ch) BW_SIM_SCGC3_ADC1(1); // Turn on clock as needed
00007     else BW_SIM_SCGC6_ADC0(1);
00008     BW_ADC_SC1n_DIFF(ch, 0, 1);     //  Differential Mode
00009     BW_ADC_CFG1_ADICLK(ch, 0);      //  Bus Clock
00010     BW_ADC_CFG1_MODE(ch, 3);        //  16Bit differential mode
00011     BW_ADC_CFG1_ADLSMP(ch, 0);      //  Short Sample Window 
00012     BW_ADC_CFG1_ADIV(ch, 3);        //  Clock / 8
00013     BW_ADC_CFG1_ADLPC(ch, 0);       //  Normal Power Mode
00014 }
00015 
00016 AnalogIn_Diff::~AnalogIn_Diff() { }
00017 
00018 int16_t AnalogIn_Diff::read_16(int channel) {  // Returns a 16bit signed integer
00019     BW_ADC_SC1n_ADCH(ch, 0, channel);      //  Trigger Conversion
00020     while(!BR_ADC_SC1n_COCO(ch, 0));    //  Wait for conversion to finish
00021     return(BR_ADC_Rn_D(ch, 0));         //  Return the result
00022 }
00023 
00024 float AnalogIn_Diff::read(int channel) {
00025     int16_t i;
00026     float t;
00027     BW_ADC_SC1n_ADCH(ch, 0, channel);
00028     while(!BR_ADC_SC1n_COCO(ch, 0));
00029     i =  BR_ADC_Rn_D(ch, 0);
00030     t = ((float) i);
00031     t = t / 32768.0f;
00032     return(t);
00033 }