Why does SPI not work with nrf_delay

Question

Why does SPI not work with nrf_delay, from this previous question
 devzone.nordicsemi.com/.../ 
 Surely the SPI SCK is a PWM or other timer/interrupt driven clock? 
 Also, I comment out nrf_delay_ms(200); and then the clock runs, but the SPI_SS_PIN does not go low?
I used 
RF5_SDK_13.0.0_04a0bfd\examples\peripheral\spi\pca10040\blank\iar
but no go.
I guess one needs to pull SPI_SS_PIN low manually?
Any help appreciated

Renix · Accepted Answer

I use nRF5_SDK_13.0.0_04a0bfd
I answered my own question after I spent a LOT of unnecessary time figuring out how to correct this. 
 IAR Preprocessor Symbol add 
It seems the nrf_delay does NOT cause SPI_SCK to have any problems.
As mentioned here . 
 P0.09 and P0.10 of the nRF52 are set for use with the NFC antenna.
To use these pins as GPIO, one has to add CONFIG_NFCT_PINS_AS_GPIOS as a Preprocessor Symbol. As Mentioned here . 
 No need to manually set NFCPINS register in UICR, mentioned here . 
 There is a #if defined (CONFIG_NFCT_PINS_AS_GPIOS) define in the bowls of the SDK, so adding the simple Preprocessor Symbol worked for me. 
 NOTE: I don't want to change the system_nrf.c or .h files to make it work. Every time there is an updated SDK, you have to make changes to those files as well.
Also, Editing uicr_config.h with
const uint32_t UICR_ADDR_0x80 attribute ((at(0x10001080))) attribute ((used)) = 0x12345678; or whatever 
 Seemed more of a hack than a solution? 
 Dev Kit Resistor changes 
On the Development Kits resistors are used to route the NFC signals to connetors. Shown here . 
 Hopefully this saves someone else some time.

Why does SPI not work with nrf_delay

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