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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.
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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.