Dear Mandrake-Experts
I have an PnP-ISA-Card installed in my PC, but do have problems
reading/writing from/to the card.
/proc/isapnp says:
Card 1 'BUR0020:BUR PCIO' PnP version 1.0
Logical device 0 'BUR0000:Unknown'
Supported registers 0x2
Device is active
Active port 0x220
Active IRQ 5
Active DMA ,0
Resources 0
Priority acceptable
Port 0x200-0xffe0, align 0x1f, size 0x20, 16-bit address decoding IRQ
3,4,5,6,7,2/9,10,11,12,14,15 High-Edge
My interpretation is that the Base Address is 0x220.
I'm using ioperm to get permission to read/write to the card as follows
(I'm root):
int initPort()
{
if(iIOAddr == 0) //iIOAddr is 0x220
return 1;
return ioperm(iIOAddr, 0x20, 1);
}
Reading(writing is done as follows:
void readIOw(uint16 iOffset, uint16 *iVal) {
if (iVal == NULL) {
printf("readIOw: can't write to null pointer\n");
return;
}
*iVal = inw(iIOAddr + iOffset);
//usleep(1);
}
void writeIOw(uint16 iOffset, uint16 iVal) {
outw(iVal, iIOAddr + iOffset);
//usleep(1);
}
Well, to be short, it doesn't work. readIOw always returns 0xffff, which
shouldn't be.
The same Card works fine under Tornado/vxWorks using the same
mechanisms. Therefore the I think the addresses are correct and it might
be a Linux realated problem.
Any help is really welcome
Marcus
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