kao yi / Mbed 2 deprecated Boboobooov4

wu

Dependencies:   mbed-rtos mbed

Fork of Bov3 by kao yi

BX-adc.cpp@19:4869b10a962e, 2014-07-02 (annotated)

Committer:
backman
Date:
Wed Jul 02 03:23:07 2014 +0000
Revision:
19:4869b10a962e
wang

Who changed what in which revision?

UserRevisionLine numberNew contents of line
backman 19:4869b10a962e 1 #ifdef TARGET_KLXX
backman 19:4869b10a962e 2
backman 19:4869b10a962e 3 #include "BX-adc.h"
backman 19:4869b10a962e 4 #include "clk_freqs.h"
backman 19:4869b10a962e 5
backman 19:4869b10a962e 6 #define MAX_FADC 6000000
backman 19:4869b10a962e 7 #define CHANNELS_A_SHIFT 5
backman 19:4869b10a962e 8
backman 19:4869b10a962e 9 FastAnalogIn::FastAnalogIn(PinName pin, bool enabled)
backman 19:4869b10a962e 10 {
backman 19:4869b10a962e 11 ADCnumber = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
backman 19:4869b10a962e 12 if (ADCnumber == (ADCName)NC) {
backman 19:4869b10a962e 13 error("ADC pin mapping failed");
backman 19:4869b10a962e 14 }
backman 19:4869b10a962e 15
backman 19:4869b10a962e 16 SIM->SCGC6 |= SIM_SCGC6_ADC0_MASK;
backman 19:4869b10a962e 17
backman 19:4869b10a962e 18 uint32_t port = (uint32_t)pin >> PORT_SHIFT;
backman 19:4869b10a962e 19 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
backman 19:4869b10a962e 20
backman 19:4869b10a962e 21 uint32_t cfg2_muxsel = ADC_CFG2_MUXSEL_MASK;
backman 19:4869b10a962e 22 if (ADCnumber & (1 << CHANNELS_A_SHIFT)) {
backman 19:4869b10a962e 23 cfg2_muxsel = 0;
backman 19:4869b10a962e 24 }
backman 19:4869b10a962e 25
backman 19:4869b10a962e 26 // bus clk
backman 19:4869b10a962e 27 uint32_t PCLK = bus_frequency();
backman 19:4869b10a962e 28 uint32_t clkdiv;
backman 19:4869b10a962e 29 for (clkdiv = 0; clkdiv < 4; clkdiv++) {
backman 19:4869b10a962e 30 if ((PCLK >> clkdiv) <= MAX_FADC)
backman 19:4869b10a962e 31 break;
backman 19:4869b10a962e 32 }
backman 19:4869b10a962e 33 if (clkdiv == 4) //Set max div
backman 19:4869b10a962e 34 clkdiv = 0x7;
backman 19:4869b10a962e 35
backman 19:4869b10a962e 36 ADC0->SC1[1] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT));
backman 19:4869b10a962e 37
backman 19:4869b10a962e 38 ADC0->CFG1 = ADC_CFG1_ADIV(clkdiv & 0x3) // Clock Divide Select: (Input Clock)/8
backman 19:4869b10a962e 39 | ADC_CFG1_MODE(3) // (16)bits Resolution
backman 19:4869b10a962e 40 | ADC_CFG1_ADICLK(clkdiv >> 2); // Input Clock: (Bus Clock)/2
backman 19:4869b10a962e 41
backman 19:4869b10a962e 42 ADC0->CFG2 = cfg2_muxsel // ADxxb or ADxxa channels
backman 19:4869b10a962e 43 | ADC_CFG2_ADACKEN_MASK // Asynchronous Clock Output Enable
backman 19:4869b10a962e 44 | ADC_CFG2_ADHSC_MASK; // High-Speed Configuration
backman 19:4869b10a962e 45
backman 19:4869b10a962e 46 ADC0->SC2 = ADC_SC2_REFSEL(0); // Default Voltage Reference
backman 19:4869b10a962e 47
backman 19:4869b10a962e 48 pinmap_pinout(pin, PinMap_ADC);
backman 19:4869b10a962e 49
backman 19:4869b10a962e 50 //Enable channel
backman 19:4869b10a962e 51 running = false;
backman 19:4869b10a962e 52 enable(enabled);
backman 19:4869b10a962e 53 }
backman 19:4869b10a962e 54
backman 19:4869b10a962e 55 void FastAnalogIn::enable(bool enabled)
backman 19:4869b10a962e 56 {
backman 19:4869b10a962e 57 //If currently not running
backman 19:4869b10a962e 58 if (!running) {
backman 19:4869b10a962e 59 if (enabled) {
backman 19:4869b10a962e 60 //Enable the ADC channel
backman 19:4869b10a962e 61 ADC0->SC3 |= ADC_SC3_ADCO_MASK; // Enable continuous conversion
backman 19:4869b10a962e 62 ADC0->SC1[0] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT)); //Start conversion
backman 19:4869b10a962e 63 running = true;
backman 19:4869b10a962e 64 } else
backman 19:4869b10a962e 65 disable();
backman 19:4869b10a962e 66 }
backman 19:4869b10a962e 67 }
backman 19:4869b10a962e 68
backman 19:4869b10a962e 69 void FastAnalogIn::disable( void )
backman 19:4869b10a962e 70 {
backman 19:4869b10a962e 71 //If currently running
backman 19:4869b10a962e 72 if (running) {
backman 19:4869b10a962e 73 ADC0->SC3 &= ~ADC_SC3_ADCO_MASK; // Disable continuous conversion
backman 19:4869b10a962e 74 }
backman 19:4869b10a962e 75 running = false;
backman 19:4869b10a962e 76 }
backman 19:4869b10a962e 77
backman 19:4869b10a962e 78 uint16_t FastAnalogIn::read_u16()
backman 19:4869b10a962e 79 {
backman 19:4869b10a962e 80 if (!running)
backman 19:4869b10a962e 81 {
backman 19:4869b10a962e 82 // start conversion
backman 19:4869b10a962e 83 ADC0->SC1[0] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT));
backman 19:4869b10a962e 84 // Wait Conversion Complete
backman 19:4869b10a962e 85 while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
backman 19:4869b10a962e 86 }
backman 19:4869b10a962e 87 if(running && ((ADC0->SC1[0]&ADC_SC1_ADCH_MASK) != (ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT)))))
backman 19:4869b10a962e 88 {
backman 19:4869b10a962e 89 running = false;
backman 19:4869b10a962e 90 enable();
backman 19:4869b10a962e 91 while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
backman 19:4869b10a962e 92 }
backman 19:4869b10a962e 93 // Return value
backman 19:4869b10a962e 94 return (uint16_t)ADC0->R[0];
backman 19:4869b10a962e 95 }
backman 19:4869b10a962e 96
backman 19:4869b10a962e 97 #endif //defined TARGET_KLXX