I2C to USART with STM32C0

Firmware for STM32C0 with CORE M0+ to use the usarts via I²C. Because I wanted a cheaper alternative to the purpose built chips that start at 6€.

Progress

• Testing with Rev0 hardware
• Designing rev1, which mainly adds led's for feedback.
• Firmware.
  • TX via DMA works
  • RX via isr works
  • todo: changing uart settings
• Writing the code for dcafs to use it, decided to rewrite the I²C part for it.
  • Sending data works.
  • todo: processing received data
  • todo: changing settings

Info

Hardware

• Starting with the STM32C011F4U6TR.
  • Program memory: 16kB (26% used)
  • Ram memory: 6kB (37% used, mainly for 512Byte circular buffers)
  • I²C: 1x FM+
  • USART x2
  • Costs about 1,2€ ex vat

Firmware

• Bare metal C code (so no LL or HAL).
• I2C to uart is handled by DMA.