55 lines
2.5 KiB
C
55 lines
2.5 KiB
C
/*
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* buttons.h
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*
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* Created on: Aug 12, 2012, modified 9/8/2017
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* Author: Gene Bogdanov
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*
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* Button debouncer, calibrated for 200 samples/sec.
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*/
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#ifndef BUTTONS_H_
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#define BUTTONS_H_
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#include <stdint.h>
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#define BUTTON_COUNT 5 // number of buttons excluding joystick directions
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#define BUTTON_AND_JOYSTICK_COUNT 9 // number of buttons including joystick directions
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#define BUTTON_SAMPLES_PRESSED 2 // number of samples before a button is considered pressed
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#define BUTTON_SAMPLES_RELEASED 5 // number of samples before a button is considered released
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// counter value indicating button pressed state
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#define BUTTON_PRESSED_STATE (BUTTON_SAMPLES_RELEASED*BUTTON_SAMPLES_PRESSED)
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#define BUTTON_STATE_INCREMENT (BUTTON_PRESSED_STATE/BUTTON_SAMPLES_PRESSED)
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#define BUTTON_STATE_DECREMENT (BUTTON_PRESSED_STATE/BUTTON_SAMPLES_RELEASED)
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#define BUTTON_SCAN_RATE 200 // [Hz] button scanning interrupt rate
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#define BUTTON_INT_PRIORITY 32 // button interrupt priority (higher number is lower priority)
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#define BUTTON_AUTOREPEAT_INITIAL 100 // how many samples must read pressed before autorepeat starts
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#define BUTTON_AUTOREPEAT_NEXT 10 // how many samples must read pressed before the next repetition
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#define JOYSTICK_UPPER_PRESS_THRESHOLD 3595 // above this ADC value, button is pressed
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#define JOYSTICK_UPPER_RELEASE_THRESHOLD 3095 // below this ADC value, button is released
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#define JOYSTICK_LOWER_PRESS_THRESHOLD 500 // below this ADC value, button is pressed
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#define JOYSTICK_LOWER_RELEASE_THRESHOLD 1000 // above this ADC value, button is released
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#define ADC_SAMPLING_RATE 1000000 // [samples/sec] desired ADC sampling rate
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#define CRYSTAL_FREQUENCY 25000000 // [Hz] crystal oscillator frequency used to calculate clock rates
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extern volatile uint32_t gButtons; // debounced button state, one per bit in the lowest bits
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extern uint32_t gJoystick[2]; // joystick coordinates
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extern uint32_t gADCSamplingRate; // [Hz] actual ADC sampling rate
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// initialize all button and joystick handling hardware
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void ButtonInit(void);
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// update the debounced button state in the global variable gButtons
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// the input argument is a bitmap of raw button state from the hardware
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void ButtonDebounce(uint32_t buttons);
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// sample joystick and convert to button presses
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void ButtonReadJoystick(void);
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// autorepeat button presses if a button is held long enough
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uint32_t ButtonAutoRepeat(void);
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#endif /* BUTTONS_H_ */
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