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In this videos, they will create the low level functions that performs the actual SPI transfers using the SPI. These functions are dependent on the micro-controller on which we wish to run the official driver, that is why these code is NOT provided by the driver and we have to write our own for our target plat from which is in this case the STM32. Then we register those function with the driver so that now the driver could call them to perform read and write on the SPI to the W5500 controller chip.
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