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Continue to ChatSTM32F4 uses SPI for the MAX6966 LED driver https://micromouseonline.com/2012/03/10/using-the-max6966-led-driver-with-spi-on-the-stm32f4/
STM32F4 uses SPI for the MAX6966 LED driver https://micromouseonline.com/2012/03/10/using-the-max6966-led-driver-with-spi-on-the-stm32f4/