DM388: GPIO Usage

Nithin Dominic

Part Number: DM388
Other Parts Discussed in Thread: TMDSCSK388

I'm using TMDSCSk388 processor on a new carrier board. IPNC_RDK 3.9.0. Presently DM388 pin H9 is configured for CAM_VS by setting ''REG32(CSL_TI814x_CTRL_MODULE_BASE + 0x0AB0) = 0x60002; /* cam_hs ] */''

I'm want to use the GPIO GP0[27] present in H9 from user space. So i modified previous setting to REG32(CSL_TI814x_CTRL_MODULE_BASE + 0x0AB0) = 0x60080; /* gp0[26] */ in

Iss_platformTI814xSetPinMux(void)

But the GPIO is not working for me.. Where I'm doing wrong

over 8 years ago

0 Anuj Kumar Gupta over 8 years ago

Genius 4030 points

Hi Nithin,

This query has been forwarded to respective team.
Meanwhile please try to search for the similar threads in e2e forum.
Regards,
Anuj
Pathpartner Technology Pvt Ltd.

0 Vishwanath Patil over 8 years ago in reply to Anuj Kumar Gupta

Expert 1610 points

where you able to cross check your pin muxing status using some devmem utility . Just because it might be configured from some other place also

0 Dwarakesh Radhakrishnan over 8 years ago in reply to Vishwanath Patil

Guru 13660 points

Agree with Vishwanath. First you need to confirm above code is being executed. And also it could be over-written somewhere else. Better would be to change the GPIO from the A8 after M3 firmware is loaded. Anyway before all this, please use devmem2 tool as suggested to check the muxing is over-written or not.

0 Nithin Dominic over 8 years ago in reply to Dwarakesh Radhakrishnan

Expert 1080 points

Thank you Vishwanath Patil and Dwarakesh R

I'm new to this Devmem2 tool can you guide with some document regarding installing and how to use the tool.

For Installiing;

sudo apt-get update

sudo apt-get install devmem2

Thank you.
Regards.

0 Anuj Kumar Gupta over 8 years ago in reply to Nithin Dominic

Genius 4030 points

Hi Nithin,

Please copy the source code from below link.

Copy it to a file in your system and cross compile it with your cross gcc.

Replace the output binary in target filesystem.

Path for your cross compiler Source/ti_tools/linux_devkit/gcc-linaro-5.3-2016.02-x86_64_arm-linux-gnueabihf/bin/

Regards,

Anuj

Pathpartner Technology Pvt Ltd.

0 Anuj Kumar Gupta over 8 years ago in reply to Anuj Kumar Gupta

Genius 4030 points

Hi Nithin,

devmem2 binary is already a part of the package. So no need to follow the steps mentioned in my above post.
On your target just use this devmem2.
It will be available in /usr/bin/ of your target filesystem.

Regards,
Anuj

0 Dwarakesh Radhakrishnan over 8 years ago in reply to Anuj Kumar Gupta

Guru 13660 points

In the DM38x
# devmem2 0x48100AB0

0 Pavel Botev over 8 years ago in reply to Nithin Dominic

TI__Guru**** 170625 points

Nithin,

In DM814x device we can not write pinmux registers (Control Module) from user space, as Cortex-A8 ARM should in supervisor/privileged mode. ARM is in supervisor/privileged mode only in u-boot/kernel stage, not in user space.

I suspect we have the same limitation here for DM38x device. See the below e2e threads for more details:

e2e.ti.com/.../1466571
e2e.ti.com/.../1053217
e2e.ti.com/.../225767
e2e.ti.com/.../1524521

Regards,
Pavel

0 Ravikiran HV over 8 years ago

Mastermind 8715 points

You can configure it from u-boot during boot time and leave it there if you need a dedicated functionality on this perticular PIN. However, switching b/w may have some restrictions

Processors

Processors forum

DM388: GPIO Usage