localhorst/lezyne-rear-light-firmware
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Merge branch 'main' into feature/energy-saving

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This commit is contained in:
Hendrik Schutter
2025-10-25 14:56:37 +02:00
parent 74a0780219 042d38b0f5
commit a9f342b45b
2 changed files with 62 additions and 17 deletions
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2
README.md
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@ -76,7 +76,7 @@ Hardware: FT232 USB-UART adapter connected to UPDI with a 4.7 kΩ resistor.
```
4. Flash using pymcuprog:
```bash
pymcuprog -t uart -u /dev/ttyUSB0 -d attiny202 write -f build/main.hex
pymcuprog -t uart -u /dev/ttyUSB0 -d attiny202 erase && pymcuprog -t uart -u /dev/ttyUSB0 -d attiny202 write -f build/main.hex
```
## Hardware Setup (FT232 → ATtiny202 UPDI)
```bash

77
main.c
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@ -10,27 +10,33 @@
#include <avr/sleep.h>
#include <avr/interrupt.h>
#define BUTTON_PIN_MASK 0x01 // PA0
#define PA1_SET_MASK 0x02 // LED 1–2
#define PA2_SET_MASK 0x04 // LED 3–6
#define PA3_SET_MASK 0x08 // LED 7–8
#define PA6_SET_MASK 0x40 // Green LED
#define PA7_SET_MASK 0x80 // Red LED
#define BUTTON_PIN_MASK 0x01 // PA0 used as RESET/UPDI pin
#define PA1_SET_MASK 0x02 ///< LED 1–2
#define PA2_SET_MASK 0x04 ///< LED 3–6
#define PA3_SET_MASK 0x08 ///< LED 7–8
#define PA6_SET_MASK 0x40 ///< Green LED pin
#define PA7_SET_MASK 0x80 ///< Red LED
#define MAIN_LOOP_SLEEP 50U // Loop period in ms
#define BUTTON_LONG_PRESS_DURATION_MS 1000U // Long press threshold
#define BUTTON_IGNORE_DURATION_MS 1000U // Ignore after long press
#define BUTTON_IGNORE_DURATION_MS 2000U // Time button ignored after long press
#define BUTTON_CONFIRMATION_BLINK_LOOPS 10U // Blink animation for confirmation
#define BUTTON_CONFIRMATION_BLINK_DURATION_MS 50U
#define MS_TO_TICKS(ms) ((ms) / MAIN_LOOP_SLEEP)
volatile bool bLedEnabled = false;
/** Global flags */
volatile bool bLedEnabled = true;
volatile bool bBtnPressed = false;
// Forward declarations
void blinkLed(bool resetCounters);
static inline void leds_off(void);
static inline void leds_on(void);
static void battery_level_indicator(void);
static void handleSwitch(void);
void blinkLed(bool resetCounters);
static void software_reset(void);
ISR(PORTA_PORT_vect);
/* --- Timer init: Use RTC PIT for periodic wake-up --- */
void init_timer(void)
@ -86,19 +92,32 @@ int main(void)
leds_off();
}
// Long press detected → show confirmation blink
// Long press detected --> show confirmation blink
if (bLedEnabledOld != bLedEnabled)
{
bLedEnabledOld = bLedEnabled;
leds_off();
_delay_ms(BUTTON_IGNORE_DURATION_MS / 10);
leds_on();
_delay_ms(BUTTON_IGNORE_DURATION_MS / 10);
leds_off();
for (uint8_t i = 0U; i < BUTTON_CONFIRMATION_BLINK_LOOPS; i++)
{
leds_off();
_delay_ms(BUTTON_CONFIRMATION_BLINK_DURATION_MS);
leds_on();
_delay_ms(BUTTON_CONFIRMATION_BLINK_DURATION_MS);
leds_off();
}
// Give time until button is released
_delay_ms(BUTTON_IGNORE_DURATION_MS);
blinkLed(true); // reset blink state machine
// Activate the interrupt for PA0
PORTA.PIN0CTRL = PORT_PULLUPEN_bm | PORT_ISC_FALLING_gc;
set_sleep_mode(SLEEP_MODE_STANDBY); // Deepest sleep mode (standby)
sleep_enable(); // Enable sleep
cli(); // Disable global interrupts
sei(); // Re-enable interrupts
sleep_cpu(); // MCU sleeps here
}
else
{
@ -171,6 +190,32 @@ static void handleSwitch(void)
prevPressed = pressed;
}
/**
* @brief Perform software reset
*/
static void software_reset(void)
{
CCP = CCP_IOREG_gc; // unlock protected registers
RSTCTRL.SWRR = 1; // trigger software reset
while (1)
; // wait for reset
}
/**
* @brief Interrupt service routine
*/
ISR(PORTA_PORT_vect)
{
// Clear interrupt flags for PA0
PORTA.INTFLAGS = BUTTON_PIN_MASK;
if (!(VPORTA.IN & BUTTON_PIN_MASK)) // check PA0 low
{
// Turn off all LEDs
software_reset();
}
}
/**
* @brief LED blink state machine (bike rear light style)
*