Embedded STM32F1 SPI - JohnHau/mis GitHub Wiki
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https://controllerstech.com/spi-using-registers-in-stm32/
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https://learnbuildshare.wordpress.com/about/stm32/using-spi-as-master/
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https://learnbuildshare.wordpress.com/about/stm32/using-spi-as-slave/
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https://community.platformio.org/t/arduino-stm32-spi-slave-example/27227
https://thecodeprogram.com/spi-communication-with-stm32-and-ads1118-using-cubemx
https://support.saleae.com/tutorials/example-projects/how-to-analyze-spi
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https://www.reddit.com/r/embedded/comments/qrwycx/uploading_firmware_by_using_spi_interface_on_an/
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