Talk:BeagleBoardFAQ

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Hi, I am new bee using BeagleBoard XM revC. I am using the following: Texas Instruments X-Loader 1.5.0 U-Boot 2011.03-rc1-00000-g9a3cc57-dirty Linux-2.6.32 Angstrom 2010.7-test-20110220 beagleboard ttyS2 I am trying to put the pin GPIO_20 high but without succes, omly GPIO_57 is reacting, I don't understand why??? I did the following:

  1. ls

export gpiochip0 gpiochip160 gpiochip32 gpiochip96 gpio20 gpiochip128 gpiochip192 gpiochip64 unexport

  1. cd gpio20
  2. ls

active_low direction edge power subsystem uevent value

  1. cat direction

out

  1. cat value

0

  1. echo 1 > value
  2. cat value

1

I did the same for gpio_21, 17,23, etc... only gpio_57 works from P17 connector.

any idea how to solve this issue?

Here the way I have set the PIN MUX for P17 expansion connector: /*gpio entries P17 auxiliary expansion header*/

OMAP3_MUX(ETK_D6, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //20,
OMAP3_MUX(ETK_D7, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //21,
OMAP3_MUX(ETK_D3, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //17,
OMAP3_MUX(ETK_D2, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //16,
OMAP3_MUX(ETK_D1, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //15,
OMAP3_MUX(ETK_D5, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //19,
OMAP3_MUX(ETK_D9, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //23,
OMAP3_MUX(ETK_D0, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //14,
OMAP3_MUX(ETK_D4, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //18,
OMAP3_MUX(ETK_CTL, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //13,
OMAP3_MUX(ETK_D8, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //22,
OMAP3_MUX(ETK_CLK, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //12,
OMAP3_MUX(HDQ_SIO, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //170,
OMAP3_MUX(GPMC_NCS6, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //57,

Thanks a lot for your advice.

You'd get much better exposure of your question by posting to the | beagleboard mailing list. --Wmat (talk) 00:55, 8 May 2013 (UTC)