LPC MicrocontrollersのトピックRe: [Solved] IOCON values not sticking

[Solved] IOCON values not sticking

lpcware — Wed, 15 Jun 2016 19:32:00 GMT

Content originally posted in LPCWare by TheOtherMike on Tue May 06 01:48:38 MST 2014
For some reason when I attempt to write to a pin's IOCON register, the values never actually take hold.

I have tried setting the register using bit masking:

IOCON_PIO2_10 &= ~0x3F;
IOCON_PIO2_10 |= (1<<4);

I have tried setting the register explicitly:

 IOCON_PIO2_10 = 0b11001000;

and I have even tried writing to the memory location of PIO2_10 ( 0x4004 4058) directly:

*(pREG32 (0x40044058)) = 0b11001000;

and nothing has worked. Every time I stop at my breakpoint after the write operation in LPCXpresso and check the value of IOCON with the attached LPC-Link, the values are incorrect. I have also verified with a multimeter that the pulldowns aren't being switched in. My question is am I missing something fundamental here?

For reference I have verified that the GPIO peripheral has power, and I am able to change pin directions.

Re: [Solved] IOCON values not sticking

lpcware — Wed, 15 Jun 2016 19:32:01 GMT

Content originally posted in LPCWare by R2D2 on Tue May 06 07:13:02 MST 2014

Quote: TheOtherMike
My question is am I missing something fundamental here?

IOCON bit in SYSAHBCLKCTRL :quest:

Re: [Solved] IOCON values not sticking

lpcware — Wed, 15 Jun 2016 19:32:01 GMT

Content originally posted in LPCWare by TheOtherMike on Tue May 06 15:34:47 MST 2014
In the words of the immortal Homer Simpson
"D'oh".
That was absolutely the problem. It's funny because I very distinctly remember reading about the AHBCLK system in the user manual and I made sure to double check there to ensure the GPIO clock was enabled.

Thanks a bunch.

Re: [Solved] IOCON values not sticking

lpcware — Wed, 15 Jun 2016 19:32:02 GMT

Content originally posted in LPCWare by R2D2 on Tue May 06 16:45:41 MST 2014

Quote: TheOtherMike
In the words of the immortal Homer Simpson "D'oh".

I've a shirt for those unforgettable moments ...

[img]http://www.lpcware.com/system/files/Doh.jpg[/img]