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Author Topic: error in user manual  (Read 1225 times)

lambda

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error in user manual
« on: December 04, 2013, 01:11:02 PM »
Hi,

the user manual (imx23-olinuxino-MINI) on page 30 says that
LinuxGPIO #32-#39 are not implemented. That appears not to
be correct: It's lcd_d00 - lcd_d08 which are available on the
GPIO connector.

I can control these pins from Linux. The only odd thing I
noticed is, that drive strength seems to be 8mA or even
12mA where I would have expected 4mA. (I did no explicit
drive strength selection, so maybe there is some reason
for that.)

HTH,
Harald

lambda

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Re: error in user manual
« Reply #1 on: January 08, 2014, 06:45:38 PM »
OK, turns out that these pins are used for boot mode selection and if anything is attached to them, the board might no longer boot from the SD Card. I tried to avoild reading these pins at boot time by pulling LCD_RS down, but this didn't have the desired effect. More digging ins needed ...