STM32 MIDI Controller Part 3: DMA Driven I2C LED Matrix

Staying on the topic of ways to use the I2C peripheral of the STM32F103 microcontroller, today, I’m going to discuss how I implemented a basic bi-color LED matrix based on the MCP23017 I2C I/O expander. This is not a full blown, colorful RGB LED matrix – its literally “monochrome”, but with the massive RAM of …

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