On Sunday 20 April 2003 07:08 pm, Sven Heithecker wrote:
> I am currently new to parport/EPP programming and need some startup-help.
> I need to access the PC's parport in EPP mode. It's going to be a "static"
> solution, so no drivers etc are needed, just plain access to the port.
> Currently I am trying something like
> int mode = IEEE1284_MODE_EPP;
> if( (fd_par = open("/dev/parport0",O_RDWR)) == -1 ) error(...)
> if(ioctl(fd_par,PPCLAIM)) error(...)
> if(ioctl(fd_par,PPNEGOT,&mode)) error(...)
> and then simple access using read(fd_par,...) and write(fd_per,...).
> However, so far the program stopps at the EPP negotiation with an I/O
> error. I activated EPP in the BIOS, but when looking at
> /proc/sys/dev/parport0, it say that no IRQ or DMA channels are assigned and
> that EPP is not possible.
Try turning on debugging in the parport module?
I'm not sure if this is the proper way, but I edited:
And changed the #undef DEBUG to #define DEBUG
And I hardcoded static int verbose_probing = 1 into parport_pc.c:97
I have the parallel port stuff compiled into, but if you are doing modules I
believe you can do something like this in your /etc/modules.conf:
alias parport_lowlevel parport_pc verbose_probing=1
Or modprobe parport_pc verbose_probing=1
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This archive was generated by hypermail 2b29 : Mon Apr 21 2003 - 16:20:19 EDT