u/Jash_Embedded

Arduino:

digitalWrite(LED, HIGH);

STM32:

“Enable GPIO peripheral clock before configuring alternate function push-pull output speed register.”

Arduino:

digitalWrite(LED, HIGH);

STM32:

“Enable GPIO peripheral clock before configuring alternate function push-pull output speed register.”

My Arduino phase:

“Loops are enough for everything 😎”

My Embedded phase:

“If this interrupt fires during DMA transfer while the scheduler switches tasks and the watchdog resets during SPI contention... I may never emotionally recover.”

I genuinely thought I “knew embedded systems” because I used Arduino for years.

Then one day I opened STM32CubeIDE.

That was my villain origin story.

Suddenly people were talking about:

- registers

- DMA

- interrupts

- RTOS

- linker scripts

Meanwhile I was still proudly typing digitalWrite() like a caveman discovering fire.

Did anyone else get humbled this hard while transitioning from Arduino to actual embedded development??