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Just curious, how does Paul flash so many MKL02/MKL04 MCU without soldering them? Thanks.

I tested out LEDs with Teensy 3.6 yesterday. Now it is not working. Voltage across 3.3V and GND gives 0.33. I think the voltage regulator is not gone. Any possibility to replace the voltage regulator?

Teensy 3.1/3.2 (K20) and 3.5 (K64) have SMC_VLLSCTRL register. However Teensy 3.6 (K66) doest not have SMC_VLLSCTRL register. Instead it has SMC_STOPCTRL register. Need to update kinetis.h ...

If you make the built-in LED to blink 5 times, it will blink 3 instead, then blink the external LED, followed by another 2 blinks on the built-in LED. If you make the built-in LED to blink 6 times, it will blink 3 instead, then blink the external LED, followed by another 3 blinks on the...

SSD1351 makes use of SPI which, at the moment, only supports external interrupts (PIOx_IRQn). I made a small change to disable SPI within SPIClass. I added the following into ssd1351.h, around line 1027, to disable SPI. void end() { SPI.end(); }

Hi: I am working on SPI now, wonder where I can find source code for the definitions such as BOARD_PIN_TO_SPI_PIN SysTick_IRQn Thanks!!

volatile int status = 0; void systick_isr() { systick_millis_count++; // Original ISR code status = !status; } void setup() { Serial.begin(9600); pinMode(LED_BUILTIN, OUTPUT); } void loop() { digitalWrite(LED_BUILTIN, status); Serial.print(systick_millis_count); Serial.print("...