Hi,
I'm sure how you can get the error you observe. In the loop pin should
never set to 0 for open the gpio file. (value = 0 is filtered and all
exceptions of this are set to non-0 values.)
Could print out the relevant values in the loop so I can understand what
going on.
Just insert the following line in the for loop:
fprintf(stderr, "linuxgpio: i=%d, pin=%d, mask=%08x,
inverse=%08x\n", i, pgm->pinno[i], pgm->pin[i].mask[0],
pgm->pin[i].inverse[0]);
René
On 29.11.2013 13:19, anonymous wrote:
URL:
<http://savannah.nongnu.org/bugs/?40748>
Summary: linuxgpio doesn't work on Raspberry PI rev. 2.
Project: AVR Downloader/UploaDEr
Submitted by: None
Submitted on: Fri 29 Nov 2013 12:19:14 PM UTC
Category: None
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Originator Name: Joakim Lubeck
Originator Email: [email protected]
Open/Closed: Open
Discussion Lock: Any
_______________________________________________________
Details:
I just wanted to test linuxgpio on a Raspberry PI rev. 2. I used the following
configuration entry:
---
programmer
id = "linuxgpio";
desc = "Use the Linux sysfs interface to bitbang GPIO lines";
type = "linuxgpio";
reset = 17;
sck = 2;
mosi = 3;
miso = 4;
;
---
And used this command:
---
sudo ./avrdude -c linuxgpio -p t1634
Can't export GPIO 0, already exported/busy?: Device or resource busy
---
I don't really know why, but it may be because GPIO 0 isn't available on the
RPi rev. 2. and because of the "special handling" of GPIO 0 in linuxgpio.c.
I don't have a solution but got it to work with this as a workaround:
---
svn diff linuxgpio.c
Index: linuxgpio.c
===================================================================
--- linuxgpio.c (revision 1250)
+++ linuxgpio.c (working copy)
@@ -257,7 +257,7 @@
//that unwanted toggling of GPIO0 can occur and that other optional pins
//mostry LED status, can't be set to GPIO0. It can be fixed when a better
//solution exists.
- for (i=0; i<N_PINS; i++) {
+ for (i=2; i<N_PINS; i++) {
if ( pgm->pinno[i] != 0 ||
i == PIN_AVR_RESET ||
i == PIN_AVR_SCK ||
---
/Joakim
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