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citroenie
Joined: 15 May 2008
Posts: 3
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| variable getting 4 bit in size after function |
 Posted: Thu May 15, 2008 6:26 am |
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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);
}
}
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Thu May 15, 2008 6:54 am |
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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)); |
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citroenie
Joined: 15 May 2008
Posts: 3
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| worked |
| Posted: Fri May 16, 2008 3:40 am |
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Thanks,
Your solution worked "&"
With kind regards
Arnoud |
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