Basic watch firmware for the cyberpunk_netwatch, see original repo for schematics and more.
The top botton will toggle the display on and off, the display will also timeout after a few seconds (this can be set with SHOW_TIME definition).
Holding the bottom button and pressing or holding the top button will set the time. Digits will flash to let you know you're in time setting mode. Holding the top button for a couple of seconds will start it increasing by 10-minute increments.
Some quick and dirty notes on power optimizations, these are mostly copied over from Bennett Warner's original repo:
Just like the original firmware, we're disabling a number of unused features with board fuses:
board_fuses.lfuse = 0xE2
board_fuses.hfuse = 0xDA
board_fuses.efuse = 0xFF
And shutting off other stuff manually during init:
void powerOptimizations()
{
//To reduce power, setup all pins as inputs with no pullups
for(int x = 1 ; x < 18 ; x++)
{
pinMode(x, INPUT);
digitalWrite(x, LOW);
}
//Power down various bits of hardware to lower power usage
set_sleep_mode(SLEEP_MODE_PWR_SAVE);
sleep_enable();
//Shut off ADC, TWI, SPI, Timer0, Timer1
ADCSRA &= ~(1<<ADEN); //Disable ADC
ACSR = (1<<ACD); //Disable the analog comparator
DIDR0 = 0x3F; //Disable digital input buffers on all ADC0-ADC5 pins
DIDR1 = (1<<AIN1D)|(1<<AIN0D); //Disable digital input buffer on AIN1/0
power_twi_disable();
power_spi_disable();
power_timer1_disable();
}
And sleeping for `8` seconds instead of just `1` in the `SIGNAL(TIMER2_OVF_vect)` interrupt.