SPI1 not work on Xavier

[tw.manny.wang]

I enable the spi1 and add spidev device node in dts.

I can find the /dev/spidev0.0, but I can’t detect the signal with Logical Analysis.

So, I want to know that the SPI1 is spidev0.0, right ?

[ShaneCCC]

Yes, it’s spi0 = “/spi@3210000”
Did you use spidev_test?

[tw.manny.wang]

yes, but i used the Logical Analysis to detect signal, it don’t work.

the 4-wire always low status.

By the way, the .config just need set the CONFIG_SPI_SPIDEV to y, right??

[tw.manny.wang]

Hi ShaneCCC,

Did you get my question???

[ShaneCCC]

Please modify the pinmux for spi1 like spi2 does. file name: tegra19x-mb1-pinmux-p2888-0000-a04-p2822-0000-b01.cfg

SPI1
pinmux.0x0243d040 = 0x00000055; # spi1_sck_pz3: rsvd1, pull-down, tristate-enable, input-enable, lpdr-disable
pinmux.0x0243d020 = 0x00000055; # spi1_miso_pz4: rsvd1, pull-down, tristate-enable, input-enable, lpdr-disable
pinmux.0x0243d058 = 0x00000055; # spi1_mosi_pz5: rsvd1, pull-down, tristate-enable, input-enable, lpdr-disable
pinmux.0x0243d010 = 0x00000059; # spi1_cs0_pz6: rsvd1, pull-up, tristate-enable, input-enable, lpdr-disable
pinmux.0x0243d050 = 0x00000059; # spi1_cs1_pz7: rsvd1, pull-up, tristate-enable, input-enable, lpdr-disable

SPI2
pinmux.0x0c302048 = 0x00000400; # spi2_sck_pcc0: spi2, tristate-disable, input-disable, io_high_voltage-disable, lpdr-disable
pinmux.0x0c302050 = 0x00000450; # spi2_miso_pcc1: spi2, tristate-enable, input-enable, io_high_voltage-disable, lpdr-disable
pinmux.0x0c302028 = 0x00000400; # spi2_mosi_pcc2: spi2, tristate-disable, input-disable, io_high_voltage-disable, lpdr-disable
pinmux.0x0c302038 = 0x00000400; # spi2_cs0_pcc3: spi2, tristate-disable, input-disable, io_high_voltage-disable, lpdr-disable

[tw.manny.wang]

But the pinmux(SPI1) value is that you say.

I even don’t modify it.

[ShaneCCC]

I mean modify the SPI1 like SPI2.

pinmux.0x0243d040 = 0x00000400; # spi1_sck_pz3: rsvd1, pull-down, tristate-enable, input-enable, lpdr-disable
pinmux.0x0243d020 = 0x00000450; # spi1_miso_pz4: rsvd1, pull-down, tristate-enable, input-enable, lpdr-disable
pinmux.0x0243d058 = 0x00000400; # spi1_mosi_pz5: rsvd1, pull-down, tristate-enable, input-enable, lpdr-disable
pinmux.0x0243d010 = 0x00000400; # spi1_cs0_pz6: rsvd1, pull-up, tristate-enable, input-enable, lpdr-disable
pinmux.0x0243d050 = 0x00000400; # spi1_cs1_pz7: rsvd1, pull-up, tristate-enable, input-enable, lpdr-disable

[tw.manny.wang]

Hi ShaneCCC,

I modified it.

I connect the spi1_mosi and spi1_miso, and run the “spidev_test”.

The result still no data on RX.

How could I do anything to figure it out the root cause?

Thank you.

[ShaneCCC]

Could you read those reg by devmem2 to confirm the reg is set correct.

[tw.manny.wang]

You are right!!!

why the pinmux didn’t work???

I just only modify the cfg file.

What did I lose something???

Am I building kernel wrong???

[tw.manny.wang]

Hi ShaneCCC,

I want to say sorry. This is my bad.

I modify the cfg file that in the sources/hardware/XXXXX folder.

It’s not in the bootloader folder.

So, I modify the cfg file in bootloader, then it works!!!

Thank you!!!

[dingjie]

If I use xavier as a slave device ,how to I change these values?

[ShaneCCC]

@dingjie
Modify the cfg file at …/Linux_for_tegra/bootloader/t186ref/BCT/tegra19x-mb1-pinmux-p2888-0000-a04-p2822-0000-b01.cfg

And reflash the device by below command
sudo ./flash.sh -r jetson-xavier mmcblk0p1

[dingjie]

If I used xavier as a spi master device,It’s useful.
but If I used xavier as a spi slave device, It doesn’t work.
I have two xavier for test.One is the master mode and the other is the slave mode.
I changed the tegra19x-mb1-pinmux-p2888-0000-a04-p2822-0000-b01.cfg,And reflashed the device.
But slave device can’t work.So I want to know if the above value is applicable to slave mode device。

Thanks

[ShaneCCC]

Have a reference to below.

TX2 SPI4

I’ve tried to change the cfg file on the host computer, but the default values will not be loaded. I’ve changed these memory locations: sudo devmem2 0x02430038 w 0x445 sudo devmem2 0x02430040 w 0x445 sudo devmem2 0x02430048 w 0x445 sudo devmem2 0x02430050 w 0x449 The slave spi is now kind of working, but it seems that there is only 32 bits buffer. Maximum 4 bytes can be read/written between each cs low pulses. I now transfer 4 times 32 bits, 128 bits totally. I’m not able to read all the d…

[dingjie]

I have try the cmd in my slave xavier follow this ,It’s no use.
sudo devmem2 0x0243d040 w 0x00000445;
sudo devmem2 0x0243d020 w 0x00000445;
sudo devmem2 0x0243d058 w 0x00000445;
sudo devmem2 0x0243d010 w 0x00000449;

In addition, I also tried setting one of the values to 449 and the other three to 445. I tried 4 times and it was useless.

could you tell me what means about these values ? how to I know,what value should I use.

Thanks

[ShaneCCC]

Have a tr y to set the TRISTATE=1
0x000000000243d040: PADCTL_UART_SPI1_SCK_0 = 0x00000454 //
E_SCHMT = 0x00000000 // [12:12] DISABLE [DISABLE=0,ENABLE=1]
GPIO_SF_SEL = 0x00000001 // [10:10] SFIO [GPIO=0,SFIO=1]
E_LPDR = 0x00000000 // [08:08] DISABLE [DISABLE=0,ENABLE=1]
E_INPUT = 0x00000001 // [06:06] ENABLE [DISABLE=0,ENABLE=1]
TRISTATE = 0x00000001 // [04:04] TRISTATE [PASSTHROUGH=0,TRISTATE=1]
PUPD = 0x00000001 // [03:02] PULL_DOWN
[NONE=0,PULL_DOWN=1,PULL_UP=2,RSVD=3]
PM = 0x00000000 // [01:00] SPI1 [RSVD1=1,RSVD2=2,RSVD3=3,SPI1=0]

[dingjie]

I tested this value and other possible values.It didn’t work too.
Once I run spidev_test on slave ,It enters the waiting state, even if I run spidev on the master, slave’s spidev_test still waiting. But I can measure the waveform on the connection line.
Could you provide me some other testing ideas？

[dingjie]

@ShaneCCC
I measured the clock and chip select signal on the connection line.
However, the slave device is always in a waiting state, and no data is sent out on the MISO.

[ShaneCCC]

How do you test the slave mode. Did you try the loopback mode?