Global Variable vrs Local function variable

[steve byrne]

Hello Im trying to figure out why the compiler barfs on the code
below if I use byte BUFFER [2]; in the actual read_shiftregister
function as opposed to using it globally as shown. Im using ver 3.112 of the compiler

Any insight would be helpful.

Thanx Steve.

#include <16f84.h>
#use fast_io(A)

#define ENABLE PIN_A1
#define CLOCK PIN_A2
#define DATA_IN PIN_A3
#define Loop while (1)

byte BUFFER [2]; // Global Variable

void read_shiftregister(){

int16 count;

output_high(CLOCK);
output_low(ENABLE);
output_high(ENABLE);

for(count=1; count<=16; ++count) {

shift_left(BUFFER, 2 ,input (DATA_IN));

output_low(CLOCK);

output_high(CLOCK);
}

output_low(ENABLE);

}

void main(){
set_tris_a(0b00100);

loop;

read_shiftregister();

}
___________________________
This message was ported from CCS's old forum
Original Post ID: 144515341

[Neutone]

Try something like this.

This code is for the ADC2402

/*-------------------------------------------------------------------
Read ADC
-------------------------------------------------------------------*/
OUTPUT_LOW(PIN_A3); //ADC CS low to verify reading is ready
if (!input(PIN_A2)) //ADC SDO low = sample ready
{
ADCreading = 0;
OUTPUT_HIGH(PIN_A1);
OUTPUT_LOW(PIN_A1);
Channel = input(PIN_A2); // read input channel
OUTPUT_HIGH(PIN_A1);
OUTPUT_LOW(PIN_A1);
OUTPUT_HIGH(PIN_A1);
OUTPUT_LOW(PIN_A1);
for (x= 1; x<= 24; x++)
{
OUTPUT_HIGH(PIN_A1);
OUTPUT_LOW(PIN_A1);
shift_left(&ADCreading,4,input(PIN_A2));
}
OUTPUT_HIGH(PIN_A3);
if (Channel) ADCreading1= ADCreading;
else ADCreading0 = ADCreading;
}
OUTPUT_HIGH(PIN_A3); //ADC CS high to begin new reading



___________________________
This message was ported from CCS's old forum
Original Post ID: 144515353