[avrdude-dev] [bug #40748] linuxgpio doesn't work on Raspberry PI rev. 2.

[anonymous]

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: address@hidden
             Open/Closed: Open
         Discussion Lock: Any

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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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