I was working on GPIO under Plan9 - very simple thing but also supports edge-raising/falling events. I had simple C code to print what pin triggered an event. I'll try to push this simple test to github during weekend. Though i'm not sure how it can be integrated - is events counting enough?
Krystian https://github.com/elewarr/plan9-bcm 2014-05-08 20:36 GMT+02:00 Bakul Shah <ba...@bitblocks.com>: > On Thu, 08 May 2014 18:58:31 BST "Steve Simon" <st...@quintile.net> wrote: > > I have a hifiberry (http://www.hifiberry.com/) nicely minimalist, > > though no driver at present - I will await the GSOC project :-) > > > I have some itron VFDs from work, 256 x 64 pixel. I like these as > > the visibility is excellent. The only annoyance is they have > > a parallel interface and I use up all the PI's GPIOs. > > > I also need to interface a rotary encoder for the tuning knob which > > is also a pain - not complex enough to justify an FPGA, but a bit too > > much to poll when the PI is doing audio decode as well. > > No need for polling. The BCM2835 can handle edge triggered > interrupts. Or you can use a PAL or CPLD. > > > Thinking of adding a PIC or an AVR just for the encoder / VFD interface > > and talking i2c to it. > >
