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