Chronometer for downhill competitions

The binary have two models: DEBUG (make debug) and RELEASE (make release or just make). DEBUGGing model use USART1 as debugging console, showing many messages.

When typing commands you can fix them using backspace key. ESC-sequences don't work.

Pinout

Interfaces

• PA11/12 -- USB

• PA9(Tx), PA10 (Rx) -- USART1 (debug console / Bluetooth / GPS proxy)

• PA2(Tx), PA3 -- USART2 (GPS)

• PB10(Tx), PB11 -- USART3 (LIDAR / console)

• PA13/14 - SWDIO

Other

• PA1 -- PPS signal from GPS (EXTI)

• PA8 -- Bluetooth "State" pin (not implemented yet)

• PA15 -- USB pullup

• PB0/1 -- TRIG0/1

• PB3 -- TRIG2

• PB8, PB9 -- onboard LEDs (PB8 - LED1, PB9 - LED0)

• PC13 -- buzzer

LED screen:

• PA5,6,7 (SCK, MISO, MOSI) -- SPI for LED screen: PA5/7 - SCK/MOSI, PA6 - SCLK/nOE (connected together)
• PB6/7 -- A/B for LED screen

LEDS

• LED0 -- shining when there's no PPS signal, fades for 0.25s on PPS
• LED1 -- don't shines if no GPS found, shines when time not valid, blinks when time valid