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Running an MOSI only SPI (setting sck to None) causes SPI to hang #410

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korken89 opened this issue Nov 4, 2022 · 0 comments
Open

Running an MOSI only SPI (setting sck to None) causes SPI to hang #410

korken89 opened this issue Nov 4, 2022 · 0 comments

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@korken89
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korken89 commented Nov 4, 2022

Hi,

I was testing using the SPI to drive a smart LED where I only needed the MOSI pin, so I set the sck pin to None.
However if one does this the SPI gets stuck in nrf_hal_common::spim::Spim<T>::do_spi_dma_transfer.
Adding back a clock pin does make it work again.

I'm not sure why this happens, and I can't find a reference in the datasheet to this behavior.
Does anyone know how to get this to work without having to have an SCK pin defined?
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