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vampirefrog
372fa4b9cf
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4 years ago | |
|---|---|---|
| .gitignore | 4 years ago | |
| Makefile | 4 years ago | |
| README.md | 4 years ago | |
| descriptors.c | 4 years ago | |
| descriptors.h | 4 years ago | |
| hardfault.c | 4 years ago | |
| i2s.c | 4 years ago | |
| i2s.h | 4 years ago | |
| led.c | 4 years ago | |
| led.h | 4 years ago | |
| sc880.c | 4 years ago | |
| sc880.map | 4 years ago | |
| usart.c | 4 years ago | |
| usart.h | 4 years ago | |
| usb-audio-structs.h | 4 years ago | |
| usbaudio.c | 4 years ago | |
| usbaudio.h | 4 years ago | |
| usbdev.c | 4 years ago | |
| usbdev.h | 4 years ago | |
| usbmidi.c | 4 years ago | |
| usbmidi.h | 4 years ago | |
README.md
sc880
Firmware for an STM32F4-based dev board attached inside a Roland SC-880. It is meant to add USB functionality, audio recording and MIDI in/out.
Details
- Development board used: Olimex STM32-H405
- Programming interface: J-Link
- Using unicore-mx as firmware library.
Physical connections:
- PB12 - I2S_WS - left/right select
- PB13 - I2S_CK - clock
- PB15 - I2S_SD - data
- PA9 - USART1_TX
Signal source
- It is tapped off from the input to the main SC-880 DAC, AK4324VF 24-pin VSOP.
- There is also a secondary DAC
- The DAC seems to be set to 20 bit mode
- WS is 32kHz
- CK is 2.048MHz
- data seems to be 20 bit
Building
Project is meant to go into the unicore-mx-examples/examples/stm32/f4/stm32f4-discovery directory.