SPI master and slave loop back test, but the slave is receive 0x00 bytes at all

RE: SPI master and slave loop back test, but the slave is receive 0x00 bytes at all

PartTimeCode — Fri, 21 Sep 2018 10:43:30 GMT

I changed the slave pins to GPIO Pins (with no additional functionality) which gives me correct output. Thanks

RE: SPI master and slave loop back test, but the slave is receive 0x00 bytes at all

Jørgen Holmefjord — Fri, 21 Sep 2018 06:56:46 GMT

GPIOs P0.05-P0.08 is used for the UART interface on the nRF52 DK. Did you cut SB22-25 to disconnect the pins from the interface MCU, and make sure you do not initialize UART or NRF_LOG with UART backend in your application?

RE: SPI master and slave loop back test, but the slave is receive 0x00 bytes at all

PartTimeCode — Fri, 21 Sep 2018 02:23:37 GMT

Hi Jorgen,

I am new to Nordic. I am also trying to create an SPI master and Slave on a single nRF52832 (PCA10040) Development board with SDK Version 15.0. I have created a slave instance in the SPI example (using SPIS example as reference).

Pin mapping:

#	PIN NAME	MASTER	SLAVE
1	MISO	Pin 28	Pin 05
2	MOSI	Pin 04	Pin 06
3	CSN	Pin 29	Pin 07
4	CLK	Pin 03	Pin 08

My issue is that the master is receiving the correct data but the slave is not.

I have checked on logic anlayzer, data on MOSI pin is valid, however, slave receive buffer does not show me correct data.

RE: SPI master and slave loop back test, but the slave is receive 0x00 bytes at all

pwgh — Mon, 11 Jun 2018 23:09:21 GMT

A bit late... but have you checked that the boards share a common ground?

RE: SPI master and slave loop back test, but the slave is receive 0x00 bytes at all

Jørgen Holmefjord — Tue, 27 Jun 2017 08:49:24 GMT

Have you modified the PCA10040 board? Note that P0.13-P0.18 is used for buttons and LEDs, and might not work with other peripherals without modification to the board and application. Could you upload your code for debugging?

RE: SPI master and slave loop back test, but the slave is receive 0x00 bytes at all

huaminhtuan — Tue, 27 Jun 2017 08:19:11 GMT

hi Jørgen Holmefjord,

I set up SPIM0 as master and SPIS1 as slave and I use pins below

SPI master------SPI slave
p13 MOSI-------------MOSI p17
p14 MISO-------------MISO p18
p12 SCK--------------SCK p16
p11 CSN--------------CSN p15

I also check SPI lines with a oscilloscope and it work correctly.

RE: SPI master and slave loop back test, but the slave is receive 0x00 bytes at all

Jørgen Holmefjord — Wed, 21 Jun 2017 08:38:03 GMT

What is the slave device? Which pins are you using on the PCA10040? Have you checked the SPI lines with a logic analyzer to see if it is actually sending anything?

RE: SPI master and slave loop back test, but the slave is receive 0x00 bytes at all

huaminhtuan — Wed, 21 Jun 2017 08:13:00 GMT

I have checked pins, they are correct and I am using SDK 13.0.0. I have only 1 PCA10040, nRF52832 board, and I create 1 SPI master 0 and 1 SPI slave 1.

RE: SPI master and slave loop back test, but the slave is receive 0x00 bytes at all

Jørgen Holmefjord — Tue, 20 Jun 2017 13:06:29 GMT

Are you sure you connected the correct pins? Do you use the spi and spis examples in the SDK? Which SDK version are you using? Are you trying this with two nRF52 DKs?