Inside LrTMAX

Usage of Timers

TIMx	Purpose
TIM1	8mS interval timer for key scanning.
TIM3	Neopixel 800KHz PWM pulse generator for CH1.
TIM6	Neopixel flashing timer.
TIM7	OLED display control timer.
TIM14	spin lock timer used for make OLED command interval and make Neopixel 'RESET' state.
TIM15	Make timing for encoder de-chater.

Power consumption

element	power(mA)
Neopixel 16mA x 8	128
OLED	40
MPU	16
sum	184
on descriptor	200

USB connection state

graph TD;
 A["POR"] --> B["NO LINK"];
 B["NO LINK"] -- establish USB conn. --> C[ESTAB];
 C[ESTAB] --> D[LINKED];
 D[LINKED] -- disconnected --> E[DISCONN];
 E[DISCONN] --> B[NOLINK];

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DFU Bootloader

push & hold SW1 and SW3 when USB connect.

Firmware reboot usage

push SW1 and SW8 simultaneously.