Hello everybody,
I will continue here... I tested the epp parallel port mode and i can read and
write data. Now i also tried to write the address but nothing happens, The
strobe signal doesn't change its state.
I also tried to set the wait signal to 0 and monitor the data_strobe (pin14)
and address_strobe (pin 17) signal with oscilloscope after i executed a simple
code (please see below). If i monitor the address_strobe signal nothing
happens, but if i monitor the data_strobe signal, i can see the pause between
the two read32() command.
The parallel port pins i fine (not burned), i can control them using ptest.hal.
Any idea what could be wrong? Does anybody have a simple code (executable) that
send the data using address_write/address_read so that i can test my hardware?
Regards
Klemen
// simple code
EPP_ADDR(0);
EPP_ADDR(1);
EPP_ADDR(2);
EPP_ADDR(3);
datain = read32(); // or write32(dataout)
EPP_ADDR(0);
EPP_ADDR(1);
EPP_ADDR(2);
EPP_ADDR(3);
datain = read32(); // or write32(dataout)
--------------
static inline void EPP_ADDR(int w) {
outb(w, ioaddr+3);
}
static inline __u32 read32(void) {
return inl(ioaddr+4);
}
________________________________
From: Klemen Dovrtel <[email protected]>
To: Jon Elson <[email protected]>; Enhanced Machine Controller (EMC)
<[email protected]>
Sent: Thursday, January 31, 2013 8:24 AM
Subject: Re: [Emc-users] EPP data transfers
I tried the pcisetup and this solved the problem for the motherboard parallel
port, now it seems it works fine (i can see the strobe signal changing). The
frequency of transfer id 1B/12us (quite slow). But I could not set the pci
parralel port card to epp mode (I have the NetMos NM9805CV pci card). I will
try some other pci parallel port card. Thank you for your help :)
BTW: how did you compile the pcisetup.c. I tried to compile the code, but i get
the "undefined reference to `outb'" error. I did try to add the -O, -O2 gcc
directive as described in man outb, but it did not help. Can you please show
your makefile compiler instructions for this.
Best Regards
Klemen
________________________________
From: Jon Elson <[email protected]>
To: Klemen Dovrtel <[email protected]>; Enhanced Machine Controller
(EMC) <[email protected]>
Sent: Wednesday, January 30, 2013 4:15 AM
Subject: Re: [Emc-users] EPP data transfers
Klemen Dovrtel wrote:
>
> --------------------- HAL file ----------------
>
> loadrt threads name1=base-thread period1=2000000 name2=servo-thread
> period2=20000000 # ns
>
It will probably be MUCH easier to test this in user mode. You need
root privileges and can open access to the parallel port with the
iopl(3) kernel service. You may also need to use something like my
pcisetup program to put the port into EPP mode. Even though it is set
to this mode in the BIOS, it may not actually be in EPP mode on a lot
of motherboards. This program is at
http://pico-systems.com/codes/pcisetup
You can also find the source code in the same directory.
Most of the LinuxCNC drivers for EPP devices do this (writing 0x80 to the
I/O register 0x402 higher than the parallel port base register) to
enable EPP mode.
Jon
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