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pkaye
on July 19, 2024
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Radxa X4 low-cost, credit card-sized Intel N100 SB...
Looks like just an UART connected between the N100 and the RP2040.
rcarmo
on July 19, 2024
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Yep. The whole point is that the GPIOs are owned by the RP2040 and you use it as a I/O coprocessor.
adrian_b
on July 19, 2024
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There is also a USB link. It is likely that this can access the debug interface of the MCU, which is needed to reprogram it.
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