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1. STM AN4678 Application note "Full duplex SPI emulation for STM32F4 microcontrollers"
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1. Trigger SPI DMA transfer from Timer https://community.st.com/s/question/0D50X0000C4MPwQSQW/trigger-spi-dma-transfer-from-timer-directly
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## Ethernet / lwIP
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see Piranha's post https://community.st.com/s/question/0D50X0000BOtfhnSQB/how-to-make-ethernet-and-lwip-working-on-stm32
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# Hardware (Board) Development
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Read the STM "Getting started with STM32xx Series hardware development" app notes carefully.
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Read the schematics and layout of a related STM Nucleo or Discovery Board for reference.
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