287 lines
6.6 KiB
C
287 lines
6.6 KiB
C
/**
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* @file main.c
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* @brief Bike rear light implementation for ATTINY202.
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*
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include <util/delay.h>
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#define BUTTON_PIN_MASK 0x01 // PA0 TODO: using RESET/UPDI pin
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#define PA1_SET_MASK 0x02 ///< LED 1–2
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#define PA2_SET_MASK 0x04 ///< LED 3–6
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#define PA3_SET_MASK 0x08 ///< LED 7–8
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#define PA6_SET_MASK 0x40 ///< Green LED pin
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#define PA7_SET_MASK 0x80 ///< Red LED
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#define MAIN_LOOP_SLEEP 10U // Main loop delay in ms
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#define BUTTON_LONG_PRESS_DURATION_MS 1000U // Long press threshold
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#define BUTTON_IGNORE_DURATION_MS 1000U // Time button ignored after long press
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/** Convert milliseconds to system ticks */
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#define MS_TO_TICKS(ms) ((ms) / MAIN_LOOP_SLEEP)
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/** Global flags */
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volatile bool bLedEnabled = true;
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volatile bool bBtnPressed = false;
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// Forward declarations
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void blinkLed(bool resetCounters);
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static inline void leds_off(void);
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static inline void leds_on(void);
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static void battery_level_indicator(void);
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static void handleSwitch(void);
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/**
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* @brief Main entry point
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*/
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int main(void)
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{
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// Configure LED pins as outputs
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VPORTA.DIR = (PA1_SET_MASK | PA2_SET_MASK | PA3_SET_MASK | PA6_SET_MASK | PA7_SET_MASK);
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// Configure PA0 as input with pull-up
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VPORTA.DIR &= ~BUTTON_PIN_MASK; // Input
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PORTA.PIN0CTRL = PORT_PULLUPEN_bm; // Pull-up enabled
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// Ensure all LEDs off at startup
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leds_off();
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battery_level_indicator(); // TODO: Implement
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bool bLedEnabledOld = bLedEnabled;
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while (true)
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{
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handleSwitch(); // Check switch state
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// Light LEDs while button is pressed
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if (bBtnPressed)
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{
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leds_on();
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}
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else
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{
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leds_off();
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}
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// Long press detected → show confirmation blink
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if (bLedEnabledOld != bLedEnabled)
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{
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bLedEnabledOld = bLedEnabled;
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leds_off();
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_delay_ms(BUTTON_IGNORE_DURATION_MS / 10);
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leds_on();
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_delay_ms(BUTTON_IGNORE_DURATION_MS / 10);
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leds_off();
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_delay_ms(BUTTON_IGNORE_DURATION_MS);
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blinkLed(true); // reset blink state machine
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}
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else
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{
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if (bLedEnabled && !bBtnPressed)
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{
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blinkLed(false); // run normal blink
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}
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}
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_delay_ms(MAIN_LOOP_SLEEP);
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}
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}
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/**
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* @brief Turn off all controlled LEDs (PA1, PA2, PA3)
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*/
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static inline void leds_off(void)
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{
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VPORTA.OUT &= (uint8_t) ~(PA1_SET_MASK | PA2_SET_MASK | PA3_SET_MASK);
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}
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/**
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* @brief Turn on all controlled LEDs (PA1, PA2, PA3)
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*/
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static inline void leds_on(void)
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{
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VPORTA.OUT |= (PA1_SET_MASK | PA2_SET_MASK | PA3_SET_MASK);
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}
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/**
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* @brief Battery monitoring
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*/
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static void battery_level_indicator(void)
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{
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// TODO: Implement
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VPORTA.OUT |= (PA6_SET_MASK | PA7_SET_MASK); // green + red OFF
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}
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/**
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* @brief Handle momentary switch input on PA0
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*
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* A long press toggles ::bLedEnabled.
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*/
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static void handleSwitch(void)
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{
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static uint16_t pressTicks = 0; ///< Press duration counter
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static bool prevPressed = false; ///< Previous button state
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bool pressed = !(VPORTA.IN & BUTTON_PIN_MASK); // Active-low
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if (pressed)
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{
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bBtnPressed = true;
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if (pressTicks < 0xFFFF)
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pressTicks++; // Prevent overflow
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}
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else
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{
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bBtnPressed = false;
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pressTicks = 0;
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}
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if (prevPressed && pressTicks >= MS_TO_TICKS(BUTTON_LONG_PRESS_DURATION_MS))
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{
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bLedEnabled = !bLedEnabled; // Toggle LED blinking
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}
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prevPressed = pressed;
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}
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/**
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* @brief LED blink state machine (bike rear light style)
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*
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* Normal cycle:
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* 0: all off, wait 250 ms
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* 2: LED 1–2 + 7–8 ON, wait 50 ms
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* 5: all off, wait 100 ms
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* 7: LED 1–2 + 7–8 ON, wait 50 ms
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* 10: all off, wait 250 ms
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* 12: LED 3–6 ON, wait 50 ms
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* 14: all off, wait 100 ms
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* 16: LED 3–6 ON, wait 50 ms
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* 18: all off, wait 250 ms → restart
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* Special: every 3rd cycle, all LEDs ON for 250 ms
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*/
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void blinkLed(bool resetCounters)
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{
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const uint8_t T50 = MS_TO_TICKS(50);
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const uint8_t T100 = MS_TO_TICKS(100);
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const uint8_t T250 = MS_TO_TICKS(250);
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static uint16_t counter = 0;
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static uint8_t state = 2; // start with LEDs-on state
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static uint8_t cycle = 0;
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if (resetCounters)
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{
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counter = 0;
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state = 12; // start with LEDs on
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cycle = 0;
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}
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counter++;
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switch (state)
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{
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case 0: // all LEDs off, wait 250 ms
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leds_off();
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if (counter >= T250)
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{
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counter = 0;
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state = 2;
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}
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break;
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case 2: // LED 1–2 + 7–8 on, wait 50 ms
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VPORTA.OUT |= (PA1_SET_MASK | PA3_SET_MASK);
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if (counter >= T50)
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{
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counter = 0;
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state = 5;
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}
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break;
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case 5: // all LEDs off, wait 100 ms
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leds_off();
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if (counter >= T100)
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{
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counter = 0;
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state = 7;
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}
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break;
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case 7: // LED 1–2 + 7–8 on, wait 50 ms
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VPORTA.OUT |= (PA1_SET_MASK | PA3_SET_MASK);
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if (counter >= T50)
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{
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counter = 0;
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state = 10;
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}
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break;
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case 10: // all LEDs off, wait 250 ms
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leds_off();
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if (counter >= T250)
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{
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counter = 0;
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state = 12;
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}
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break;
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case 12: // LED 3–6 on, wait 50 ms
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VPORTA.OUT |= PA2_SET_MASK;
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if (counter >= T50)
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{
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counter = 0;
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state = 14;
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}
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break;
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case 14: // all LEDs off, wait 100 ms
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leds_off();
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if (counter >= T100)
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{
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counter = 0;
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state = 16;
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}
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break;
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case 16: // LED 3–6 on, wait 50 ms
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VPORTA.OUT |= PA2_SET_MASK;
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if (counter >= T50)
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{
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counter = 0;
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state = 18;
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}
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break;
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case 18: // all LEDs off, wait 250 ms
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leds_off();
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if (counter >= T250)
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{
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counter = 0;
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if (++cycle >= 3)
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{
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cycle = 0;
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state = 20; // special all-LEDs-on state
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}
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else
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{
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state = 0; // restart normal cycle
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}
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}
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break;
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case 20: // special: all LEDs on for 250 ms
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VPORTA.OUT |= (PA1_SET_MASK | PA2_SET_MASK | PA3_SET_MASK);
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if (counter >= T250)
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{
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counter = 0;
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state = 0; // restart normal sequence
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}
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break;
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}
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}
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