RE: nrf52 Preview DK SPI Master - No Slave Select Toggle

bvuong87 — Fri, 22 Jan 2016 02:37:40 GMT

Answered my question with a few more questions to research on my own :)

It looks like this snippet of code here, where the SPI Master driver is initialized, requires a callback function instead of NULL to keep the SPI Peripheral out of "blocking mode" which I'm led to believe keeps the driver from releasing the SPI enable signal back to high.

err_code = nrf_drv_spi_init(&m_spi_master_1, &config, NULL);    // NULL event handler = block

Changing this to...

err_code = nrf_drv_spi_init(&m_spi_master_1, &config, spi_master_1_event_handler);

and defining a blank spi_master_1_event_handler() like so seems to have solved the problem. See attached snips of the bus lines.

void spi_master_0_event_handler(nrf_drv_spi_event_t event){}

Chalk it up to a lesson learned and hope this helps somebody!