rockbox
- FiiO X1 bare-metal audio: four GPIO offsets, all wrong
A bare-metal sine-wave test for the FiiO X1's PCM5142 DAC built clean; two code reviews forced 16 fixes, including four GPIO offsets. None of it ran.
- FiiO X1 Rockbox bootloader: 12 KB of SD, FAT32 and a menu
A bare-metal dual-boot loader for the FiiO X1: SD reads, a FAT32 driver, a cache flush that review caught, 12,512 bytes. Built and reviewed, not yet run.