How to Test Custom SPI Devices on the Jetson AGX Orin EVK

channinglan · June 28, 2022, 6:22am

I can see
SPI_MISO_LVS , SPI_MOSI_LVS ,SPI_CS0_LVS ,SPI_CS0_LVS ,SPI_CS1_LVS
is SPI1 bus

So can I connect directly to a custom SPI device for testing ?

Register as a spidev device to read and write directly ?

kayccc · June 28, 2022, 6:30am

Please refer to Jetson/TX2 SPI - eLinux.org, concept is similar.

channinglan · June 29, 2022, 2:35am

Is there any PINMUX documentation for ORIN??
pinmux configuration files not bootloader/t186ref/BCT/tegra186-mb1-bct-pinmux-*.cfg.
seems to be modified to tegra234-mb1-bct-pinmux-p3701-0000.dtsi

ORIN SPI3 in 40 pin conn
So I modify tegra234-mb1-bct-pinmux-p3701-0000.dtsi
spi3_sck_py0 {
nvidia,pins = “spi3_sck_py0”;
nvidia,function = “spi3”;
nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
nvidia,tristate = <TEGRA_PIN_DISABLE>;
nvidia,enable-input = <TEGRA_PIN_ENABLE>;
nvidia,io-high-voltage = <TEGRA_PIN_DISABLE>;
nvidia,lpdr = <TEGRA_PIN_DISABLE>;
};

		spi3_miso_py1 {
			nvidia,pins = "spi3_miso_py1";
			nvidia,function = "spi3";
			//nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
			//nvidia,tristate = <TEGRA_PIN_DISABLE>;
			nvidia,pull = <TEGRA_PIN_PULL_UP>;
			nvidia,tristate = <TEGRA_PIN_ENABLE>;				
			nvidia,enable-input = <TEGRA_PIN_ENABLE>;
			nvidia,io-high-voltage = <TEGRA_PIN_DISABLE>;
			nvidia,lpdr = <TEGRA_PIN_DISABLE>;
		};

		spi3_mosi_py2 {
			nvidia,pins = "spi3_mosi_py2";
			nvidia,function = "spi3";
			nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
			nvidia,tristate = <TEGRA_PIN_DISABLE>;
			nvidia,enable-input = <TEGRA_PIN_ENABLE>;
			nvidia,io-high-voltage = <TEGRA_PIN_DISABLE>;
			nvidia,lpdr = <TEGRA_PIN_DISABLE>;
		};	


		spi3_cs0_py3 {
			nvidia,pins = "spi3_cs0_py3";
			nvidia,function = "spi3";
			nvidia,pull = <TEGRA_PIN_PULL_UP>;
			nvidia,tristate = <TEGRA_PIN_DISABLE>;
			nvidia,enable-input = <TEGRA_PIN_ENABLE>;
			nvidia,io-high-voltage = <TEGRA_PIN_DISABLE>;
			nvidia,lpdr = <TEGRA_PIN_DISABLE>;
		};

		spi3_cs1_py4 {
			nvidia,pins = "spi3_cs1_py4";
			nvidia,function = "spi3";
			nvidia,pull = <TEGRA_PIN_PULL_UP>;
			nvidia,tristate = <TEGRA_PIN_DISABLE>;
			nvidia,enable-input = <TEGRA_PIN_ENABLE>;
			nvidia,io-high-voltage = <TEGRA_PIN_DISABLE>;
			nvidia,lpdr = <TEGRA_PIN_DISABLE>;
		};

And short circuit these two pins

but still not working

root@user-desktop:/home/user# ./spidev_test -v -D /dev/spidev2.1
spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 kHz)
TX | FF FF FF FF FF FF 40 00 00 00 00 95 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F0 0D |…@…|
RX | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |…|
root@user-desktop:/home/user# ./spidev_test -v -D /dev/spidev2.0
spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 kHz)
TX | FF FF FF FF FF FF 40 00 00 00 00 95 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F0 0D |…@…|
RX | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |…|
root@user-desktop:/home/user#

How to confirm that PINMUX is set successfully ???

channinglan · June 30, 2022, 3:08am

Change the setting to spi1, still no response

		spi1_sck_pz3 {
			nvidia,pins = "spi1_sck_pz3";
			nvidia,function = "spi1";
			nvidia,pull = <TEGRA_PIN_PULL_NONE>;
			nvidia,tristate = <TEGRA_PIN_DISABLE>;
			nvidia,enable-input = <TEGRA_PIN_DISABLE>;
			nvidia,io-high-voltage = <TEGRA_PIN_DISABLE>;
			nvidia,lpdr = <TEGRA_PIN_DISABLE>;
		};

		//pinmux.0x0243d020 = 0x00000458;
		spi1_miso_pz4 {
			nvidia,pins = "spi1_miso_pz4";
			nvidia,function = "spi1";					//1:0
			nvidia,pull = <TEGRA_PIN_PULL_UP>;			//3:2
			nvidia,tristate = <TEGRA_PIN_ENABLE>;		//4
			nvidia,io-high-voltage = <TEGRA_PIN_DISABLE>;//5				
			nvidia,enable-input = <TEGRA_PIN_ENABLE>;	//6

			nvidia,lpdr = <TEGRA_PIN_DISABLE>;			//7
		};

		spi1_mosi_pz5 {
			nvidia,pins = "spi1_mosi_pz5";
			nvidia,function = "spi1";
			nvidia,pull = <TEGRA_PIN_PULL_NONE>;
			nvidia,tristate = <TEGRA_PIN_DISABLE>;
			nvidia,enable-input = <TEGRA_PIN_DISABLE>;
			nvidia,io-high-voltage = <TEGRA_PIN_DISABLE>;
			nvidia,lpdr = <TEGRA_PIN_DISABLE>;
		};

		//pinmux.0x0243d010 = 0x00000400;
		spi1_cs0_pz6 {
			nvidia,pins = "spi1_cs0_pz6";
			nvidia,function = "spi1";
			nvidia,pull = <TEGRA_PIN_PULL_NONE>;
			nvidia,tristate = <TEGRA_PIN_DISABLE>;
			nvidia,enable-input = <TEGRA_PIN_DISABLE>;
			nvidia,io-high-voltage = <TEGRA_PIN_DISABLE>;
			nvidia,lpdr = <TEGRA_PIN_DISABLE>;
		};

		spi1_cs1_pz7 {
			nvidia,pins = "spi1_cs1_pz7";
			nvidia,function = "spi1";
			nvidia,pull = <TEGRA_PIN_PULL_NONE>;
			nvidia,tristate = <TEGRA_PIN_DISABLE>;
			nvidia,enable-input = <TEGRA_PIN_DISABLE>;
			nvidia,io-high-voltage = <TEGRA_PIN_DISABLE>;
			nvidia,lpdr = <TEGRA_PIN_DISABLE>;
		};

root@user-desktop:/home/user# ./spidev_test -v -D /dev/spidev0.0
spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 kHz)
TX | FF FF FF FF FF FF 40 00 00 00 00 95 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F0 0D |…@…|
RX | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |…|

channinglan · June 30, 2022, 3:23am

How to update only pinmux config ?
How to confirm whether pinmux has been updated successfully?

WayneWWW · June 30, 2022, 3:30am

You can directly read the register after you boot up.

channinglan · June 30, 2022, 3:51am

root@user-desktop:/home/user# cat /sys/kernel/debug/tegra_pinctrl_reg
cat: /sys/kernel/debug/tegra_pinctrl_reg: No such file or directory

Why no tegra_pinctrl_reg ??

WayneWWW · June 30, 2022, 3:53am

I mean you can directly read the register which you just posted in above comment by using devmem.

channinglan · June 30, 2022, 5:24am

I set it directly and it seems to work
But why can’t I modify Linux_for_Tegra/bootloader/t186ref/BCT/tegra234-mb1-bct-pinmux-p3701-0000.dtsi to take effect

root@user-desktop:/home/user# busybox devmem 0x0243d008 32 0x400
ox devmem 0x0243d018 32 0x458
root@user-desktop:/home/user# busybox devmem 0x0243d018 32 0x458
root@user-desktop:/home/user# busybox devmem 0x0243d028 32 0x400
root@user-desktop:/home/user# busybox devmem 0x0243d038 32 0x400
root@user-desktop:/home/user# busybox devmem 0x0243d040 32 0x400
root@user-desktop:/home/user# busybox devmem 0x0243d008 32
0x00000400
root@user-desktop:/home/user# busybox devmem 0x0243d018 32
0x00000458
root@user-desktop:/home/user# busybox devmem 0x0243d028 32
0x00000400
root@user-desktop:/home/user# busybox devmem 0x0243d038 32
0x00000400
root@user-desktop:/home/user# busybox devmem 0x0243d040 32
0x00000400
root@user-desktop:/home/user#
root@user-desktop:/home/user#
root@user-desktop:/home/user# ./spidev_test -v -D /dev/spidev0.0
spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 kHz)
TX | FF FF FF FF FF FF 40 00 00 00 00 95 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F0 0D |…@…|
RX | FF FF FF FF FF FF 40 00 00 00 00 95 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F0 0D |…@…|

WayneWWW · June 30, 2022, 5:26am

Could you share which file got modified and how you flash?

channinglan · June 30, 2022, 5:47am

./flash.sh -k A_kernel jetson-agx-orin-devkit mmcblk0p1

20220630_flash.log (54.5 KB)

I can see
copying pinmux_config(/home/share/HD2/NVDIA_DATA/Tegra186_git_3410_org/tegra186/Linux_for_Tegra/bootloader/t186ref/BCT/tegra234-mb1-bct-pinmux-p3701-0000.dtsi)… done.

tegra234-mb1-bct-pinmux-p3701-0000.dtsi (68.4 KB)

WayneWWW · June 30, 2022, 6:25am

Hi,

That dtsi is not in in use in the kernel partition. Please full flash again

channinglan · June 30, 2022, 7:14am

./flash.sh jetson-agx-orin-devkit mmcblk0p1

20220630_flash_all.log (66.9 KB)

root@user-desktop:/home/user# busybox devmem 0x0243d008 32
0x00000000
root@user-desktop:/home/user# busybox devmem 0x0243d018 32
0x00000058
root@user-desktop:/home/user# busybox devmem 0x0243d028 32
0x00001000
root@user-desktop:/home/user# busybox devmem 0x0243d038 32
0x00000000
root@user-desktop:/home/user# busybox devmem 0x0243d040 32
0x00000000

still not working …

WayneWWW · June 30, 2022, 8:16am

Then please check if any device tree node is using this pin.

channinglan · July 1, 2022, 9:20am

I tried many times
Still can’t update pinmux

tegra234-p3701-0000-p3737-0000_o.dts (387.0 KB)

tegra234-mb1-bct-pinmux-p3701-0000.dtsi (66.7 KB)

202207011700_flash.log (66.8 KB)

root@user-desktop:/home/user# busybox devmem 0x0243d008 32
0x00000000
root@user-desktop:/home/user# busybox devmem 0x0243d018 32
0x00000058
root@user-desktop:/home/user# busybox devmem 0x0243d028 32
0x00001000
root@user-desktop:/home/user# busybox devmem 0x0243d038 32
0x00000000
root@user-desktop:/home/user# busybox devmem 0x0243d040 32
0x00000000
root@user-desktop:/home/user#

WayneWWW · July 1, 2022, 9:23am

Hi,

Just want to confirm. What is current status?
You can make SPI work if you directly modify the pinmux register directly?

channinglan · July 1, 2022, 9:31am

I directly modify the pinmux register
busybox devmem 0x0243d008 32 0x400
busybox devmem 0x0243d018 32 0x458
busybox devmem 0x0243d028 32 0x400
busybox devmem 0x0243d038 32 0x400
busybox devmem 0x0243d040 32 0x400

The actual mount reads the nor-flash id,
miso no data read, all are 0
root@user-desktop:/home/user# insmod /lib/modules/5.10.65-tegra/kernel/drivers/mtd/spi-nor/spi-nor.ko
[ 2098.758864] spi-nor spi0.1: unrecognized JEDEC id bytes: 00 00 00 00 00 00

channinglan · July 5, 2022, 5:33am

How to confirm pinmux update ??

channinglan · July 11, 2022, 1:16am

Regarding the pinmux update, how can I confirm it?

va11 · July 20, 2022, 6:12am

Are you trying to configure SPI1 as master ? Can you specify the ask here ? I will try to provide you the pinmux settings