the SPI clock line holding low for a short interval between bytes when transfer more bytes

[steveqin]

when we send more bytes with spi transfer function, we found the clock line adds a low space interval between bytes, as we understand that the clock line is controlled by the master, what causes this random interval on the clock line of the master spi?

[Kenneth]

Hello,

It's not entirely clear what api you are using here, but I would expect a delay between each call to spi_transceive(), however the bytes within each spi_transceive() should not be visible. If you have delay between bytes within an call to spi_transceive() I would likely have checked that you are using compatible = "nordic,nrf-spim"; (instead of compatible = "nordic,nrf-spi";) in your .dts or .overlay file.

Kenneth