P-Seriesのトピックp2041 Problem with GPIO

p2041 Problem with GPIO

osmanzekier — Thu, 25 Jun 2015 10:45:24 GMT

Greetings,

I am trying to configure GPIO pins 16,17,30 and 31 as outputs. rcw 12 is set to 0xc8c39100. I can not test the output pins with a multimeter. It seems, from reading GPIODAT register, 16 and 17 works fine. 30 and 31 always seem to be 0. Pins are NOT set to open drain configuration. I tried rcw12 set to 0x88c39100 and 0x48c39100 also but it did not work. Any help is appreciated.

Thanks.

Re: p2041 Problem with GPIO

lunminliang — Fri, 26 Jun 2015 03:19:17 GMT

Hello Osman Zeki ER,

From your RCW12, it seems you have RCW[360-361] bit field EC1 to be 0b11, don't you?

If the EC1 RCW is not set to be 0b01, then RCW[]352-353] field is meaningless.

And also as you are trying to set GPIO30 and 31 to be output, you may want to write the corresponding part in GPIODAT?

Have a great day,
Lunmin

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Re: p2041 Problem with GPIO

osmanzekier — Fri, 26 Jun 2015 05:57:38 GMT

Hello Lunmin LIANG,

Having EC1 set to 0b01 has solved the issue. Thank you.

And by "reading GPIODAT register" I meant writing then reading.

Thank you again for your help.