Ned Konz / billy_bass

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Dependencies:   mbed

FastAnalogIn.h@1:2fa375aacece, 2013-05-14 (annotated)

Committer:
bikeNomad
Date:
Tue May 14 14:08:22 2013 +0000
Revision:
1:2fa375aacece
Child:
2:5bcd2f55a294
trying to get continuous conversion going

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bikeNomad 1:2fa375aacece 1 #ifndef __included_fast_analog_in_h
bikeNomad 1:2fa375aacece 2 #define __included_fast_analog_in_h
bikeNomad 1:2fa375aacece 3
bikeNomad 1:2fa375aacece 4 #include "mbed.h"
bikeNomad 1:2fa375aacece 5
bikeNomad 1:2fa375aacece 6 namespace NK
bikeNomad 1:2fa375aacece 7 {
bikeNomad 1:2fa375aacece 8
bikeNomad 1:2fa375aacece 9 using namespace mbed;
bikeNomad 1:2fa375aacece 10
bikeNomad 1:2fa375aacece 11 class FastAnalogIn: public mbed::AnalogIn
bikeNomad 1:2fa375aacece 12 {
bikeNomad 1:2fa375aacece 13 public:
bikeNomad 1:2fa375aacece 14 void start_read() {
bikeNomad 1:2fa375aacece 15 ADC0->SC1[0] = ADC_SC1_ADCH(_adc.adc); // start conversion
bikeNomad 1:2fa375aacece 16 }
bikeNomad 1:2fa375aacece 17
bikeNomad 1:2fa375aacece 18 uint16_t read_u16() {
bikeNomad 1:2fa375aacece 19 // Wait Conversion Complete
bikeNomad 1:2fa375aacece 20 while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
bikeNomad 1:2fa375aacece 21
bikeNomad 1:2fa375aacece 22 // Return value
bikeNomad 1:2fa375aacece 23 return (uint16_t)ADC0->R[0];
bikeNomad 1:2fa375aacece 24 }
bikeNomad 1:2fa375aacece 25
bikeNomad 1:2fa375aacece 26 FastAnalogIn(PinName what)
bikeNomad 1:2fa375aacece 27 : mbed::AnalogIn(what) {
bikeNomad 1:2fa375aacece 28 ADC0->CFG2 = /* ADC_CFG2_MUXSEL_MASK // ADxxb channels are selected */
bikeNomad 1:2fa375aacece 29 0 | ADC_CFG2_ADACKEN_MASK // Asynchronous Clock Output Enable
bikeNomad 1:2fa375aacece 30 | ADC_CFG2_ADHSC_MASK // High-Speed Configuration
bikeNomad 1:2fa375aacece 31 | ADC_CFG2_ADLSTS(0); // Long Sample Time Select = 24 clocks
bikeNomad 1:2fa375aacece 32
bikeNomad 1:2fa375aacece 33 // set up for averaging 16 samples at 125KHz sample rate => 7812.5 samples/sec
bikeNomad 1:2fa375aacece 34 ADC0->SC3 = ADC_SC3_AVGE_MASK // Hardware Average Enable
bikeNomad 1:2fa375aacece 35 | ADC_SC3_AVGS(2) // 16 Samples Averaged
bikeNomad 1:2fa375aacece 36 | ADC_SC3_ADCO_MASK; // contin conversion
bikeNomad 1:2fa375aacece 37 }
bikeNomad 1:2fa375aacece 38
bikeNomad 1:2fa375aacece 39 void enable_interrupt() {
bikeNomad 1:2fa375aacece 40 ADC0->SC1[0] |= ADC_SC1_AIEN_MASK; // enable interrupt
bikeNomad 1:2fa375aacece 41 ADC0->SC1[1] |= ADC_SC1_AIEN_MASK; // enable interrupt
bikeNomad 1:2fa375aacece 42 }
bikeNomad 1:2fa375aacece 43 void disable_interrupt() {
bikeNomad 1:2fa375aacece 44 ADC0->SC1[0] &= ~ADC_SC1_AIEN_MASK; // disable interrupt
bikeNomad 1:2fa375aacece 45 ADC0->SC1[1] &= ~ADC_SC1_AIEN_MASK; // disable interrupt
bikeNomad 1:2fa375aacece 46 }
bikeNomad 1:2fa375aacece 47
bikeNomad 1:2fa375aacece 48 };
bikeNomad 1:2fa375aacece 49
bikeNomad 1:2fa375aacece 50 }
bikeNomad 1:2fa375aacece 51
bikeNomad 1:2fa375aacece 52 #endif