the SPI Lookback example running on nrf5340dk and nrf52840dk output different as expected

RE: the SPI Lookback example running on nrf5340dk and nrf52840dk output different as expected

scottwan — Fri, 05 Nov 2021 06:23:37 GMT

finally it works after I changed the pin used and the project configuration.

the board overlay file changed as below:

&spi1 {
	compatible = "nordic,nrf-spis";
	status = "okay";
	sck-pin = <41>;
	mosi-pin = <40>;
	miso-pin = <39>;
	csn-pin = <38>;
	
	def-char = <0xC3>;
};

&spi2 { 
	compatible = "nordic,nrf-spim"; 
	status = "okay";
	sck-pin = <4>;
	mosi-pin = <5>;
	miso-pin = <6>;

	cs-gpios = <&gpio0 7 GPIO_ACTIVE_LOW>;
};

the prj.conf file changed as below:

#
# Copyright (c) 2020 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
#

CONFIG_SPI=y

# CONFIG_SPI_1=y
CONFIG_SPI_SLAVE=y
# CONFIG_SPI_1_OP_MODES=2

# CONFIG_SPI_2=y
# CONFIG_SPI_2_OP_MODES=1
# CONFIG_SOC_NRF52832_ALLOW_SPIM_DESPITE_PAN_58=y

# CONFIG_USE_SEGGER_RTT=y
# CONFIG_RTT_CONSOLE=y
# CONFIG_UART_CONSOLE=n

RE: the SPI Lookback example running on nrf5340dk and nrf52840dk output different as expected

Susheel Nuguru — Thu, 04 Nov 2021 11:38:18 GMT

Hi,

I did not run this steps from the blogpost, but a closer look to your logs show that you are using pin numbers 22,23,24 and 25 on nRF5340 DK (same numbers as shown in the github example for nRF52 DK).

But note that on nRF5340 DK (assigned pins for buttons and Leds) Section 4.7 Buttons and LEDs that gpio pin 23 and 24 are used for buttons and cannot be used for SPI in your example. Please used some unassigned pin numbers for SPI. You will see all pre assigned pin numbers at the back of your DK.

RE: the SPI Lookback example running on nrf5340dk and nrf52840dk output different as expected

Susheel Nuguru — Wed, 03 Nov 2021 09:30:56 GMT

Hi,

It seems like there might be some adjustments to do with nRF53 as that blog is written for nRF52. I have not tested it myself, but can do it tomorrow to see if i find some differences that needs to be adjusted in configuration.