https://devzone.nordicsemi.com/f/nordic-q-a/15761/nrf52832-spi-bugHI: i use SPI is ok when i set frequency = NRF_DRV_SPI_FREQ_1M,but SPI will work abnormal when i set frequency = NRF_DRV_SPI_FREQ_500K/NRF_DRV_SPI_FREQ_250K/NRF_DRV_SPI_FREQ_125K, error code=NRF_ERROR_BUSY,why??,frequency&gt;=1M is ok,frequency&lt;1Men-USTelligent Community 13Wed, 17 Aug 2016 07:00:58 GMThttps://devzone.nordicsemi.com/thread/60156?ContentTypeID=1Wed, 17 Aug 2016 07:00:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cdb53010-5fc2-421d-9fb8-a8c9ca305e11Susheel Nuguru<p>it seems possible, maybe we hear something from @larry.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/60158?ContentTypeID=1Tue, 16 Aug 2016 07:27:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:486ada1d-337b-44c7-b193-5230e993f5d4RK<p>my guess would be he&#39;s sending something at a fixed rate or using a fixed delay or something like that. At the high speed 1Mb/s the data is sent before the next packet is ready, but as the speed is lowered, it takes too long to send the data and he tries the next packet and gets the BUSY error.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/60157?ContentTypeID=1Tue, 16 Aug 2016 06:59:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3d5e05cb-1963-4767-a4d0-3cb3588ab6afSusheel Nuguru<p>NRF_ERROR_BUSY is not abnormal, it is the error generated when you are asking the module to do something when the module(hardware/driver/library) is busy. It means that you can retry the same request after sometime.</p> <p>I am not sure why you are getting this error for slower frequencies, you could debug and see.</p><div style="clear:both;"></div>