PCB version 0.3 arrived at 10/Jul/2017.
All modules are working.
A special USB PHY delay configuration bit that enables high speed emulation was documented in the datasheet, but not defined in CMSIS. High speed USB communication was achieved after set that bit. Ref: d070bdc07e3bdfec3a8a624d0a44e92771caf28e
DMA mode USB data transfer was also implemented to improve efficiency and speed. Ref: 05829952d575437ad2a27e92f92a793220bf7cf9
Implemented basic SDXC card reading support for FatFs with exFAT. Currently able to list the root directory. Ref: a533bfca300d274cbab92f0cf839af180bcc39e1
The STM32F722 datasheet specifies a maximum clock of 50MHz for the SDMMC module, but apparently overclocking to 72MHz seems working correctly. Ref: f921fa0003cd33b52d53c10216d65118ff924933
The 19.2MHz clock output do work for both USB PHY and audio codec, exact 192kHz audio sample rate was achieved. Ref: c284e13682f06af5ae020a14341e6799a0cb27d1 Ref: a9983ac51ba2dee561845c982c949c1cd8b875a2
Implemented DMA transfer for audio codec, sine wave output seems working. 3.5mm jack was also working as expected. Ref: acdb68e6fa551f508fab2dfc265e23cf27ff71f5
TODO list: USB audio interface USB configuration interface and GUI application USB mass storage interface for SDMMC RGB LEDs rendering and configuration In-Application Programming for firmware update Bootloader for recovery Propose a new name?
Ref: c284e13682f06af5ae020a14341e6799a0cb27d1
Gallery: [gallery ids=”941,939,938,940” type=”rectangular” link=”file”]