Class similar to AnalogIn that uses burst mode to run continious background conversions so when the input is read, the last value can immediatly be returned.
Fork of FastAnalogIn by
Obsolete!
Has been already merged with Erik's original repository => take the original!
- Added support for LPC4088.
- Fixed linker error (missing definition of static member "channel_usage")
FastAnalogIn_KLXX.cpp
- Committer:
- frankvnk
- Date:
- 2014-03-08
- Revision:
- 3:a9b753c25073
- Parent:
- 2:9b61d0792927
- Child:
- 5:55274430c8df
File content as of revision 3:a9b753c25073:
#ifdef TARGET_KLXX #include "FastAnalogIn.h" #include "clk_freqs.h" #define MAX_FADC 6000000 #define CHANNELS_A_SHIFT 5 FastAnalogIn::FastAnalogIn(PinName pin, bool enabled) { ADCnumber = (ADCName)pinmap_peripheral(pin, PinMap_ADC); if (ADCnumber == (ADCName)NC) { error("ADC pin mapping failed"); } SIM->SCGC6 |= SIM_SCGC6_ADC0_MASK; uint32_t port = (uint32_t)pin >> PORT_SHIFT; SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port); uint32_t cfg2_muxsel = ADC_CFG2_MUXSEL_MASK; if (ADCnumber & (1 << CHANNELS_A_SHIFT)) { cfg2_muxsel = 0; } // bus clk uint32_t PCLK = bus_frequency(); uint32_t clkdiv; for (clkdiv = 0; clkdiv < 4; clkdiv++) { if ((PCLK >> clkdiv) <= MAX_FADC) break; } if (clkdiv == 4) //Set max div clkdiv = 0x7; ADC0->SC1[1] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT)); ADC0->CFG1 = ADC_CFG1_ADIV(clkdiv & 0x3) // Clock Divide Select: (Input Clock)/8 | ADC_CFG1_MODE(3) // (16)bits Resolution | ADC_CFG1_ADICLK(clkdiv >> 2); // Input Clock: (Bus Clock)/2 ADC0->CFG2 = cfg2_muxsel // ADxxb or ADxxa channels | ADC_CFG2_ADACKEN_MASK // Asynchronous Clock Output Enable | ADC_CFG2_ADHSC_MASK; // High-Speed Configuration ADC0->SC2 = ADC_SC2_REFSEL(0); // Default Voltage Reference pinmap_pinout(pin, PinMap_ADC); //Enable channel running = false; enable(enabled); } void FastAnalogIn::enable(bool enabled) { //If currently not running if (!running) { if (enabled) { //Enable the ADC channel ADC0->SC3 |= ADC_SC3_ADCO_MASK; // Enable continuous conversion ADC0->SC1[0] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT)); //Start conversion running = true; } else disable(); } } void FastAnalogIn::disable( void ) { //If currently running if (running) { ADC0->SC3 &= ~ADC_SC3_ADCO_MASK; // Disable continuous conversion } running = false; } uint16_t FastAnalogIn::read_u16() { if (!running) { // start conversion ADC0->SC1[0] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT)); // Wait Conversion Complete while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK); } if(running && ((ADC0->SC1[0]&ADC_SC1_ADCH_MASK) != (ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT))))) { running = false; enable(); while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK); } // Return value return (uint16_t)ADC0->R[0]; } #endif //defined TARGET_KLXX