Lpc2000

Hi,
Im trying to interface a magnetic reader to the LPC and im having a bit of trouble regarding the GPIO lines.
The code runs fine on OKI ARM 7 and hynix's ARM 7 so im pretty sure its not the code.The reader communicates with the micro via STROBE and DATA.
I have tried using pins 5,6 and 8,9 as the DATA,STROBE lines but it doesnt seem to read the data out of the buffers.
Anyway here are some of the things I cant seem to figure out....
 
1) The data Sheet says IOPIN register isnt Byte Accessable, does that mean I cant write macros to read specific bits of the register,eg...
 
#define DATA         (((PORT_32BIT_PTR)(IOPIN)->bits.bit8)
 
where PORT_32BIT_PTR is a bitfield.
Likewise with the strobe line, except that the pointer is to the IOSET or IOCLR register
If I cant do this is there another way to access specific bits of the IO Input Register? or do I have to read the entire port?
 
2) The reader has 10K pullups on the STROBE and DATA lines and I was wondering if these are to much?I know this question have been asked before so I apologise for asking somebody to repeat themselves!!!
 
The last question..(I Think!) is how fast can I strobe the IO lines, the reader has a maximum read speed of 10MBits/s so if i do some thing like....
        STROBE=0;
            Sleep(100);
       STROBE=1;
Is there is delay between clearing a bit and the like actually going low?

Thanks for any help, 
David
 
 


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