Helmut Schmücker / FastAnalogIn

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Fork of FastAnalogIn by Erik -

FastAnalogIn_KLXX.cpp@2:9b61d0792927, 2014-03-08 (annotated)

Committer:
frankvnk
Date:
Sat Mar 08 15:44:57 2014 +0000
Revision:
2:9b61d0792927
Child:
3:a9b753c25073
Added KLxx support

Who changed what in which revision?

UserRevisionLine numberNew contents of line
frankvnk 2:9b61d0792927 1 #ifdef TARGET_KLXX
frankvnk 2:9b61d0792927 2
frankvnk 2:9b61d0792927 3 #include "FastAnalogIn.h"
frankvnk 2:9b61d0792927 4 #include "clk_freqs.h"
frankvnk 2:9b61d0792927 5
frankvnk 2:9b61d0792927 6 #define MAX_FADC 6000000
frankvnk 2:9b61d0792927 7 #define CHANNELS_A_SHIFT 5
frankvnk 2:9b61d0792927 8
frankvnk 2:9b61d0792927 9 /*typedef struct analogin_s fanalogin_t;
frankvnk 2:9b61d0792927 10
frankvnk 2:9b61d0792927 11 void fanalogin_init (fanalogin_t *obj, PinName pin);
frankvnk 2:9b61d0792927 12 float fanalogin_read (fanalogin_t *obj);
frankvnk 2:9b61d0792927 13 uint16_t fanalogin_read_u16(fanalogin_t *obj);
frankvnk 2:9b61d0792927 14
frankvnk 2:9b61d0792927 15 fanalogin_t _adc;*/
frankvnk 2:9b61d0792927 16
frankvnk 2:9b61d0792927 17 FastAnalogIn::FastAnalogIn(PinName pin, bool enabled)
frankvnk 2:9b61d0792927 18 {
frankvnk 2:9b61d0792927 19 ADCnumber = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
frankvnk 2:9b61d0792927 20 if (ADCnumber == (ADCName)NC) {
frankvnk 2:9b61d0792927 21 error("ADC pin mapping failed");
frankvnk 2:9b61d0792927 22 }
frankvnk 2:9b61d0792927 23
frankvnk 2:9b61d0792927 24 SIM->SCGC6 |= SIM_SCGC6_ADC0_MASK;
frankvnk 2:9b61d0792927 25
frankvnk 2:9b61d0792927 26 uint32_t port = (uint32_t)pin >> PORT_SHIFT;
frankvnk 2:9b61d0792927 27 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
frankvnk 2:9b61d0792927 28
frankvnk 2:9b61d0792927 29 uint32_t cfg2_muxsel = ADC_CFG2_MUXSEL_MASK;
frankvnk 2:9b61d0792927 30 if (ADCnumber & (1 << CHANNELS_A_SHIFT)) {
frankvnk 2:9b61d0792927 31 cfg2_muxsel = 0;
frankvnk 2:9b61d0792927 32 }
frankvnk 2:9b61d0792927 33
frankvnk 2:9b61d0792927 34 // bus clk
frankvnk 2:9b61d0792927 35 uint32_t PCLK = bus_frequency();
frankvnk 2:9b61d0792927 36 uint32_t clkdiv;
frankvnk 2:9b61d0792927 37 for (clkdiv = 0; clkdiv < 4; clkdiv++) {
frankvnk 2:9b61d0792927 38 if ((PCLK >> clkdiv) <= MAX_FADC)
frankvnk 2:9b61d0792927 39 break;
frankvnk 2:9b61d0792927 40 }
frankvnk 2:9b61d0792927 41 if (clkdiv == 4) //Set max div
frankvnk 2:9b61d0792927 42 clkdiv = 0x7;
frankvnk 2:9b61d0792927 43
frankvnk 2:9b61d0792927 44 ADC0->SC1[1] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT));
frankvnk 2:9b61d0792927 45
frankvnk 2:9b61d0792927 46 ADC0->CFG1 = ADC_CFG1_ADIV(clkdiv & 0x3) // Clock Divide Select: (Input Clock)/8
frankvnk 2:9b61d0792927 47 | ADC_CFG1_MODE(3) // (16)bits Resolution
frankvnk 2:9b61d0792927 48 | ADC_CFG1_ADICLK(clkdiv >> 2); // Input Clock: (Bus Clock)/2
frankvnk 2:9b61d0792927 49
frankvnk 2:9b61d0792927 50 ADC0->CFG2 = cfg2_muxsel // ADxxb or ADxxa channels
frankvnk 2:9b61d0792927 51 | ADC_CFG2_ADACKEN_MASK // Asynchronous Clock Output Enable
frankvnk 2:9b61d0792927 52 | ADC_CFG2_ADHSC_MASK; // High-Speed Configuration
frankvnk 2:9b61d0792927 53
frankvnk 2:9b61d0792927 54 ADC0->SC2 = ADC_SC2_REFSEL(0); // Default Voltage Reference
frankvnk 2:9b61d0792927 55
frankvnk 2:9b61d0792927 56 pinmap_pinout(pin, PinMap_ADC);
frankvnk 2:9b61d0792927 57
frankvnk 2:9b61d0792927 58 //Enable channel
frankvnk 2:9b61d0792927 59 running = false;
frankvnk 2:9b61d0792927 60 enable(enabled);
frankvnk 2:9b61d0792927 61 }
frankvnk 2:9b61d0792927 62
frankvnk 2:9b61d0792927 63 void FastAnalogIn::enable(bool enabled)
frankvnk 2:9b61d0792927 64 {
frankvnk 2:9b61d0792927 65 //If currently not running
frankvnk 2:9b61d0792927 66 if (!running) {
frankvnk 2:9b61d0792927 67 if (enabled) {
frankvnk 2:9b61d0792927 68 //Enable the ADC channel
frankvnk 2:9b61d0792927 69 ADC0->SC3 |= ADC_SC3_ADCO_MASK; // Enable continuous conversion
frankvnk 2:9b61d0792927 70 ADC0->SC1[0] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT)); //Start conversion
frankvnk 2:9b61d0792927 71 running = true;
frankvnk 2:9b61d0792927 72 } else
frankvnk 2:9b61d0792927 73 disable();
frankvnk 2:9b61d0792927 74 }
frankvnk 2:9b61d0792927 75 }
frankvnk 2:9b61d0792927 76
frankvnk 2:9b61d0792927 77 void FastAnalogIn::disable( void )
frankvnk 2:9b61d0792927 78 {
frankvnk 2:9b61d0792927 79 //If currently running
frankvnk 2:9b61d0792927 80 if (running) {
frankvnk 2:9b61d0792927 81 ADC0->SC3 &= ~ADC_SC3_ADCO_MASK; // Disable continuous conversion
frankvnk 2:9b61d0792927 82 }
frankvnk 2:9b61d0792927 83 running = false;
frankvnk 2:9b61d0792927 84 }
frankvnk 2:9b61d0792927 85
frankvnk 2:9b61d0792927 86 uint16_t FastAnalogIn::read_u16()
frankvnk 2:9b61d0792927 87 {
frankvnk 2:9b61d0792927 88 if (!running)
frankvnk 2:9b61d0792927 89 {
frankvnk 2:9b61d0792927 90 // start conversion
frankvnk 2:9b61d0792927 91 ADC0->SC1[0] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT));
frankvnk 2:9b61d0792927 92 // Wait Conversion Complete
frankvnk 2:9b61d0792927 93 while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
frankvnk 2:9b61d0792927 94 }
frankvnk 2:9b61d0792927 95 if(running && ((ADC0->SC1[0]&ADC_SC1_ADCH_MASK) != (ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT)))))
frankvnk 2:9b61d0792927 96 {
frankvnk 2:9b61d0792927 97 running = false;
frankvnk 2:9b61d0792927 98 enable();
frankvnk 2:9b61d0792927 99 while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
frankvnk 2:9b61d0792927 100 }
frankvnk 2:9b61d0792927 101 // Return value
frankvnk 2:9b61d0792927 102 return (uint16_t)ADC0->R[0];
frankvnk 2:9b61d0792927 103 }
frankvnk 2:9b61d0792927 104
frankvnk 2:9b61d0792927 105 #endif //defined TARGET_KLXX
frankvnk 2:9b61d0792927 106