embeddedatmelsamd21

Building Atmel START project to load with UF2 bootloader

I'm trying to build an Atmel START project using GCC such that it will load with the Adafruit UF2 bootloader on a SAMD21 chip.

From prior research I've learned that I need to have the text section start at offset 0x2000, and I need to specify the same offset to bossac when flashing.

I've done both, and confirmed that they are working as intended by reading back the memory but I'm still not able to flash a minimal blinky built using Atmel code.

What am I missing?

Solution

  • I solved my own issue, turns out it was a bug in my code, since I never put a delay after the GPIO write, the LED wasn't turning on. Adding a delay solved the issue.