Which GPIO for GPU corresponds the Pins B23 and B25 on JetsonTX1_OEM_Product_DesignGuide ?

Autonomous Machines Jetson & Embedded Systems Jetson TX1
1

Hi all,
I have added two CAN-bus with MCP2515 over SPI on Carrier Board.But,I used the Pins B23 and B25 on JetsonTX1_OEM_Product_DesignGuide to be SPI_INT.Now,I don’t know Which GPIO for GPU was defined as the B23 and B25.So,Can anyone give me the Corresponding relation？
Thanks in advance.

2

The GPIO for GPU causes that we can not debug CAN-bus on the software.

3

They are GPIO6/7 as you can find in page 19 of JetsonTX1_Developer_Kit_Carrier_Board_Spec.pdf

[url]http://developer.nvidia.com/embedded/dlc/jetson-tx1-developer-kit-carrier-board-spec[/url]

4

Hi Trumany,
I have tried the two GPIOs.But,it doesn’t work.I mean that GPIO6/7 don’t Correspond TEGRA_GPIO_PA6/7 as Seeing figure below.

GPIOs defined route in kernel: kernel_source/arch/arm/mach-tegra/gpio-names.h

So,I want to know GPU’s GPIO for Jetson TX1 module B23/25. Can you sure it?
Thanks,very much.

5

Hi Trumany,
My issue point is defferent with these.I konw B23/25 are GPIO6/7 in JetsonTX1_OEM_Product_DesignGuide.Now,I need to define the two GPIOs in kernel software.But,Which two GPIOs correspond the pin of B23/25?The GPIOs number printed as attachment.
Please Help,thanks in advance.

http://p1.bqimg.com/1949/cb3b272a973935d5.jpg

6

Hi Trumany,
My issue point is defferent with these.I konw B23/25 are GPIO6/7 in JetsonTX1_OEM_Product_DesignGuide.Now,I need to define the two GPIOs in kernel software.But,Which two GPIOs correspond the pin of B23/25?The GPIOs number printed as attachment.
Please Help,thanks in advance.

http://p1.bqimg.com/1949/cb3b272a973935d5.jpg

7

Hello, Wance:
For pin, you can refer to Jetson_TX1_Generic_Customer_Pinmux_Customer_Release.xlsm, which can be downloaded from NV web.
B23 – GPIO7/TOUCH_RST GPIO3_PV.06 (That’s PV06)
B25 – GPIO6/TOUCH_INT GPIO3_PX.01 (That’s PX01)

And then you can get the corresponding GPIO number from file gpio-names.h

br
Chenjian

8

Oh,Good.I get it
Thank you very much.

9

Take a look at the file “kernel_source/drivers/pinctrl/pinctrl-tegra210.c”.
There is a list directly mapping the pin-names to gpio-indices, including also the ones not having their gpio-name in the spreadsheet (if you want for some reason to use for example a spi- or uart-pin as a gpio).

10