Bsp 6.14.01 on omap3530 could not operate on gpio bank 5??

Huai Hellen

Hi, all

I use gpioclrbit(128, 0) to clear bit 128, but it could not work, the same thing happens to gpio129, which is also belongs to gpio bank 5.

but when I operate other gpio bank, It can work properly. such as gpio 43, gpio17, ect.

Of course, I have config the pin for gpio mode corretly, and configure them to output.

My question is :

Is there any difference betewwen bank gpio5 and other gpio banks???

over 15 years ago

0 Huai Hellen over 15 years ago

Expert 1030 points

PS: the difference mainly refers to the power domain, I suppose?

0 Steve Kipisz over 15 years ago in reply to Huai Hellen

TI__Genius 15510 points

You might want to make sure the clock is enabled for GPIO5. Look at CM_FCLKEN_PER (0x48005000) bit 16. This enables the functional clock for GPIO5. The interface clock is CM_ICLKEN_PER (0x48005010) bit 16.

Steve K.

0 Michael T over 15 years ago in reply to Steve Kipisz

TI__Expert 6735 points

There is nothing different about the GPIO5 module (gpio_159 .. gpio_128). The pad config registers need to

be programmed to select gpio_128 and gpio_129 instead of mmc1_dat6 and mmc1_dat7, respectively and

the GPIO5 module registers need to be configured.

Some GPIO pins are input-only, but these are only gpio99 and gpio_100 and gpio_112 through gpio_115.

Michael T

0 Soren Steen Christensen over 15 years ago in reply to Huai Hellen

Genius 3685 points

Sorry to correct you TI guys a bit :-) - Speaking about power domains. GPIO120 to GPIO129 are actually a bit special, since they can be used for both for 1V8 and 3V0 operation. More info to be found at: http://processors.wiki.ti.com/index.php?title=Additional_Configuration_for_GPIO120-129_on_OMAP35x. Other than this the GPIOs behave exactly like normal :-)

I hope this helps - Good luck
Søren

0 Michael T over 15 years ago in reply to Soren Steen Christensen

TI__Expert 6735 points

Soren:

Thanks for taking time to point that out. That is likely the cause of the problem.

Michael T

0 Soren Steen Christensen over 15 years ago in reply to Michael T

Genius 3685 points

You are welcome
Søren

0 Huai Hellen over 15 years ago in reply to Soren Steen Christensen

Expert 1030 points

Michael T and Soren:

Thank you two. I followed you suggested , changed the power for gpio120---129 and the problem resolved

0 Huai Hellen over 15 years ago in reply to Huai Hellen

Expert 1030 points

Michael

Now , I use getgpiobit function to get its value. but it always return 0, even if it is high, and I measure it using multimeter and it is 1.79V

Is there anything need to pay attenttion to when using GetGPIOBit for gpio126-129

0 Yang Luo over 15 years ago in reply to Huai Hellen

Prodigy 230 points

Hellen,

I also facing the same problem on GPIO 128. I tested with input voltage 3v and the GpioGetBit function always return 0. Have you solved the problem?

Regards

Luo Yang

0 Huai Hellen over 15 years ago in reply to Yang Luo

Expert 1030 points

Sorry to say NO

0 Soren Steen Christensen over 15 years ago in reply to Huai Hellen

Genius 3685 points

And you did remember to set the input enable bit in the pad-conf register in the System Control Module for the given gpio/ball?

AFAIR nothing (other than what has already been discussed earlier in this thread) is special for GPIO127-129. For GPIO126 you need to make sure it is only muxed to one ball at a time (it case be routed to two different balls). Further info on this can be found at: http://e2e.ti.com/support/dsp/omap_applications_processors/f/447/p/60604/217376.aspx#217376

Good luck - Enjoy your weekends
Søren

0 Huai Hellen over 15 years ago in reply to Soren Steen Christensen

Expert 1030 points

Yes, You are right. I indeed mux this pin twice. when I uncomment the other one, it works correctly.

Thank you!

0 Yang Luo over 15 years ago in reply to Huai Hellen

Prodigy 230 points

I checked my code, and I also mux it twice... Haven't test but this should be the cause....

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Bsp 6.14.01 on omap3530 could not operate on gpio bank 5??