How to enable SPI pins in my jetson nano A203 carrier board for the communication with RFID-RC522 and also steps to verify that our SPI is enabled?

[shivachauhan843]

I want to know the steps to enable SPI pins in my jetson nano A203 carrier board for the communication with RFID-RC522 and also steps to verify that our SPI is enabled?
I followed the steps mentioned in given link

How to enable SPI communication on A203 carrier board and Jetson Nano Production Module

Please tell me how to enable the pins for SPI communication on the SeeedStudio A203 Carrier Board Version 2 with the Jetson Nano Module. My hardware configuration looks like below. Jetson Nano Production module (eMMC 16GB) Seeed studio A203 (Version 2) Carrier Board So far, I have done the following: First, I tried to set the pin with jetson-io.py, but only “Configure Jetson Nano CSI Connector” was displayed and there was no pin setting item. Next, I followed the tutorial for the A203 boar…

but it did not work.

[KevinFFF]

Hi shivachauhan843,

@shivachauhan843

I want to know the steps to enable SPI pins in my jetson nano A203 carrier board

It seems a custom carrier board from SeeedStudio.

Could you refer to the following thread to verify SPI loopback test before using RFID-RC522?
Jetson Nano SPI Bus Not Working - #10 by KevinFFF

[shivachauhan843]

can you mention steps to enable SPI pins in my board?

[KevinFFF]

Please share the full flash log for further check.

[shivachauhan843]

On the UBUNTU host system
step1. I installed jetpack OS.
step 2. tar xf Jetson-210_Linux_R32.7.2_aarch64.tbz2
cd Linux_for_Tegra/rootfs/
sudo tar xpf …/…/Tegra_Linux_Sample-Root-Filesystem_R32.7.2_aarch64.tbz2
sudo ./apply_binaries.sh
On the jetson
step 3. cd Linux_for_Tegra/kernel/dtb
dtc -I dtb -O dts -o ./extracted.dts ./tegra210-p3448-0002-p3449-0000-b00.dtb
step 4. changed the extracted.dts file

spi1_mosi_pc0 {
				nvidia,pins = "spi1_mosi_pc0";
				nvidia,function = "spi1";
				nvidia,pull = <0x1>;
				nvidia,tristate = <0x0>;
				nvidia,enable-input = <0x1>;
			};

			spi1_miso_pc1 {
				nvidia,pins = "spi1_miso_pc1";
				nvidia,function = "spi1";
				nvidia,pull = <0x1>;
				nvidia,tristate = <0x0>;
				nvidia,enable-input = <0x1>;
			};

			spi1_sck_pc2 {
				nvidia,pins = "spi1_sck_pc2";
				nvidia,function = "spi1";
				nvidia,pull = <0x1>;
				nvidia,tristate = <0x0>;
				nvidia,enable-input = <0x1>;
			};

			spi1_cs0_pc3 {
				nvidia,pins = "spi1_cs0_pc3";
				nvidia,function = "spi1";
				nvidia,pull = <0x1>;
				nvidia,tristate = <0x0>;
				nvidia,enable-input = <0x1>;
			};

			spi1_cs1_pc4 {
				nvidia,pins = "spi1_cs1_pc4";
				nvidia,function = "spi1";
				nvidia,pull = <0x1>;
				nvidia,tristate = <0x0>;
				nvidia,enable-input = <0x1>;
			};

step 5. Convert the dts file to a dtb file using the device tree compiler.

dtc -I dts -O dtb -o ./tegra210-p3448-0002-p3449-0000-b00.dtb ./extracted.dts

step 6. Flash

sudo ./flash.sh -d ./kernel/dtb/tegra210-p3448-0002-p3449-0000-b00.dtb jetson-nano-emmc mmcblk0p1

for Testing the SPI –
step 1. connected MOSI(19) to MISO(21) pins with a jumper.
step2 . Compiled this file

gcc spidev_test.c -o spidev_test

spidev_test.c (8.3 KB)

sudo modprobe spidev

step 4. Tested the spi butit is showing no communication

[KevinFFF]

Please share the full flash log as file here and tegra210-p3448-0002-p3449-0000-b00.dtb for further check.

[shivachauhan843]

tegra210-p3448-0002-p3449-0000-b00.dtb (233.5 KB)

[KevinFFF]

Please also share the result of the following command on your board.

 $ sudo cat /sys/kernel/debug/tegra_pinctrl_reg | grep -i spi

I just tried to decompile your dtb and found it’s not configured correctly for SPI.

			spi1_mosi_pc0 {
				nvidia,pins = "spi1_mosi_pc0";
				nvidia,function = "rsvd1";
				nvidia,pull = <0x1>;
				nvidia,tristate = <0x0>;
				nvidia,enable-input = <0x1>;
			};

[shivachauhan843]

this is the file in which I have changed
tegra210-p3448-0002-p3449-0000-b00.dtb (231.6 KB)

[KevinFFF]

From your updated dtb, it seems you’ve configured it as SPI usage.

			spi1_mosi_pc0 {
				nvidia,pins = "spi1_mosi_pc0";
				nvidia,function = "spi1";
				nvidia,pull = <0x1>;
				nvidia,tristate = <0x1>;
				nvidia,enable-input = <0x0>;
			};

But the result from your pinmux register seems not expected.

Have you updated this dtb in <Linux_for_Tegra>/kernel/dtb and reflash the board to apply the change?