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From: Patrick <kpa_info@yahoo.fr>
To: barebox@lists.infradead.org
Subject: GPIO commands on OMAP4
Date: Thu, 05 Apr 2012 11:40:49 +0200	[thread overview]
Message-ID: <4F7D68A1.9000800@yahoo.fr> (raw)

Dear mailing-list,

I am using a pcm049 phyCORE omap4430 module from Phytec with BareBox 
2011.09.0 patched with BSP from Phytec.

I would like to use the GPIO command to read a switch at startup. This 
chip is connected on ABE_MCBSP1_DX (gpio_116). I have edited the 
boards/pcm049/mux.c files to change the configuration of this GPIO as 
follow: {ABE_MCBSP1_DX, (DIS | IEN | M3)} instead of {ABE_MCBSP1_DX, 
(SAFE_MODE)}.

I then use the "gpio_get_value 116" command followed by "echo $?" to 
read the value. I always read a 0. On Linux I could read the right value 
depending of the position of the switch, so it's not an hardware problems.

I have tried with one of the two LEDs on the module (gpio_152) and I 
could change the LED state and read it back with gpio_get_value.

I do not understand what I am doing wrong. Any help will be appreciated.

Patrick



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             reply	other threads:[~2012-04-05  9:40 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-05  9:40 Patrick [this message]
2012-04-05 12:45 ` GPIO commands on OMAP4 Patrick
2012-04-05 13:49 ` Sascha Hauer
2012-04-05 14:38   ` Patrick
2012-04-05 14:58     ` Patrick
2012-04-05 16:19       ` Sascha Hauer

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