Shiftin on Port B

[stma]

Hi,
I was wondering if anyone clould take a look at this and give any idea where it is going wrong.
The pins are connected to a CPLD which is a 32 bit counter with a multiplexer controlled by the outputs of portA. The loop steps thru the various addresses of the multiplexer selecting which bit to put onto pin_b3.
Pin_b2 just enables the multiplexer.
I know the hardware works fine as I have had it running with PicBAsic Pro.
I am new to the shiftin command and suspect thats where the problem may lie.

#byte PORTA = 5
#define ALL_OUT 0
#define ALL_IN 0xff
#use fast_io(A)

void ReadScan()
{
int n,data;
int32 buffer;
set_tris_a(ALL_OUT);
output_low(pin_b2);

for(n=0;n<=31;n++)
{
porta=n;
output_high(pin_b2);
shift_left(&buffer,4,input(pin_B3));
output_low(pin_b2);
}
printf(" %08lx \n\r",buffer);
return;
}

Ive looked at pin_B2 and portA on the scope and they seems to be operating as required. Nothing coming in on B3 though.
Thanks
Steve

[Mark]

You should post a small but complete program and use the code button. As for the problem the code looks okay to me. My guess is that you are using a 16F87X device and didn't specify NOLVP in the fuses. RB3 is the LVP pin on these devices.

[Guest]

All sorted. Thanks to all for the advice.
Cheers
Steve

[Mark]

So what was the problem?