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Inline assembly question with PCWHD CCS C compiler 4.071

 
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klanglais



Joined: 28 Mar 2008
Posts: 6
Location: 70 Industrial Way Wilmington, ma 01887

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Inline assembly question with PCWHD CCS C compiler 4.071
PostPosted: Thu Apr 10, 2008 6:30 am     Reply with quote

I built the PIC24H Demo code for Explorer 16 Board that came with my Microchip Explorer 16 Board using the Microchip C 30 compiler. Now I am porting the code to the CCS C compiler. So far so good.

Problem:
I am getting the following error.

Executing: "C:\Program Files\PICC\Ccsc.exe" +FD "delay.c" +EXPORT +DF +LN +T +A +M +Z +ICD +Y=0 +EA I+="..\h"
*** Error 95 "delay.c" Line 51(3,5): Expecting an opcode mnemonic _temp_count

********************
This is the original code in delay.c

unsigned int temp_count;

void Delay( unsigned int delay_count )
{
temp_count = delay_count +1;
asm volatile("outer: dec _temp_count");
asm volatile("cp0 _temp_count");
asm volatile("bra z, done");
asm volatile("repeat #3200" );
asm volatile("nop");
asm volatile("repeat #3200" );
asm volatile("nop");
asm volatile("bra outer");
asm volatile("done:");
}

******************************
I changed it to:

unsigned int temp_count;

void Delay( unsigned int delay_count )
{
temp_count = delay_count +1;
#asm
outer:
dec _temp_count
cp0 _temp_count <= this is line 51
bra z, done
repeat #3200
nop
repeat #3200
nop
bra outer
done:
#endasm
}

************************

Any ideas?
Thanks
Ken
Question
ckielstra



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

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PostPosted: Thu Apr 10, 2008 7:17 am     Reply with quote

I suggest you use the CCS supplied functions delay_us() and delay_ms(). These function names are more descriptive than the Microchip delay() and delay_us() combination. Also in CCS style you can call the function directly with the desired delay instead of having to use a defined value.
Code:
Microchip style:
   #define Delay_5mS_Cnt     (Fcy * 0.005) / 2950
   Delay(Delay_5mS_Cnt);     // 5ms delay

CCS style:
   delay_ms(5);              // code self explaining, no description needed.
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