STM32 MIDI Controller Part 1B: I2C Event Interrupt Driven MCP23017 LCD
The problem with the simple approach In part 1A, I presented a simple approach that did the job quite well. However, since the program has to wait for the slow I2C bus to send more than 30 bytes of data every single time the LCD is fully updated, it simply wouldn’t cut it for a MIDI controller which not only has to send keypresses with as low a latency as possible, but also has to do a whole bunch of timing critical stuff like bit angle modulation, polling five rotary encoders, and multiplexing an LED matrix....