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variable getting 4 bit in size after function

 
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citroenie



Joined: 15 May 2008
Posts: 3

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variable getting 4 bit in size after function
PostPosted: Thu May 15, 2008 6:26 am     Reply with quote
Hello PIC users,

I can't figure out what I'm doing wrong. Maby someone can help me.

I'm sending a value (16 bits in size) to a function. The function never gets a value above 4 bit (max 0x0f). What am I doing wrong? Here is some code which gives the error..

With kind regards

Arnoud

Code:

define DAC_CLK PIN_B1
#define DAC_DI PIN_C2
#define DAC_FS PIN_E1
#define DAC_nPRE PIN_E2
#define DAC_nLDAC PIN_E0
 
#include <stdlib.h>
#include <STDLIB.H>
 

#use delay(clock=20000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,stream=RS232,bits=8)
 
//=============================================================
 
void write_TL(int16 data)
   {
        BYTE cmd[2];
        BYTE i;
       
   printf("%Lx\n\r",data);       [b][color=red][b]<--- DATA is max 0x00f (only 4 bit?)[/b][/color][/b]
 

        output_high(DAC_nLDAC);
        output_low(DAC_CLK);
        output_low(DAC_FS);
 
        for(i=0; i<16; ++i)
           {
            output_bit(DAC_DI, shift_left(data,2,0));
            output_high(DAC_CLK);
           delay_us(50);
            output_low(DAC_CLK);
             }
 

      output_high(DAC_FS);
 
      output_low(DAC_nLDAC);
      delay_us(10);
 
      output_HIGH(DAC_nLDAC);
   }
 
 

//==========
 
 
 

void main() {
 
int16 k;

 
 while (true)
  {
  for(k=0; k< 0xffff ; k++)      // sending an 16 bit value = max 0xffff
   {
   
     write_TL(k);
     printf("%Lx\n\r",data);       [b][color=red][b]<--- DATA is max 0x00f (only 4 bit?)[/b][/color][/b]
     }
 

  delay_us(500000);
 }
 
}
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Thu May 15, 2008 6:54 am     Reply with quote
The variable 'data' is unknown in main().

What is your compiler version number?

Code:
output_bit(DAC_DI, shift_left(data,2,0));
This is a bug changing random memory. Change to
Code:
output_bit(DAC_DI, shift_left(&data,2,0));
citroenie



Joined: 15 May 2008
Posts: 3

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worked
PostPosted: Fri May 16, 2008 3:40 am     Reply with quote
Thanks,

Your solution worked "&"

With kind regards

Arnoud
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