CC5X C compiler for PICmicro

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Example Code

The example code are supplied in TXT files including the generated ASM files.
(Please use the BACK button on your browser to get back to this page).

int16xx.txt   (asm) : simple interrupt example
delay.txt      (asm) : implementing delays
state.txt       (asm) : state machine example
serial.txt      (asm) : simple serial data receiving and sending
div16_8.txt (asm) : fast unsigned divide, 16 bit / 8 bit
fmath1.txt   (-asm) : fixed and floating point math example
scaling.txt   (asm) : linear scaling, up to 16 bit

Small C example

The remaining of this page contains a small C program example and some of the files generated by CC5X.

  1. SAMPLE1.C        ;source code
  2. SAMPLE1.OCC  ;compiler output file
  3. SAMPLE1.ASM  ;generated assembly file
  4. SAMPLE1.FCS   ;function call structure
  5. SAMPLE1.VAR  ;variable layout

 

SAMPLE1.C

/* global variables */
char a;
bit b1, b2;

/* assign names to port pins */
#pragma bit in  @ PORTB.0
#pragma bit out @ PORTB.1

void sub( void)
{
    char i;      /* a local variable */

    /* generate 20 pulses */
    for ( i = 0; i < 20; i++)  {
        out = 1;
        nop();
        out = 0;
    }
}

void main( void)
{
    // if (TO == 1 && PD == 1 /* power up */)  {
    //   WARM_RESET:
    //     clearRAM(); // clear all RAM if required
    // }

 /* first decide the initial output level
    on the output port pins, and then
    define the input/output configuration.
    This avoids spikes at the output pins. */

    PORTA =      0b.0010;  /* out = 1 */
    TRISA = 0b.1111.0001;  /* xxxx 0001 */

    a = 9;  /* value assigned to global variable */

    do  {
        if (in == 0)  /* stop if 'in' is low */
             break;
        sub();
    } while ( -- a > 0);  /* 9 iterations */

    // if (some condition)
    //    goto WARM_RESET;

    /* main is terminated by a SLEEP instruction */
}

SAMPLE1.OCC

CC5X Version 3.4, Copyright (c) B Knudsen Data, Norway 1992-2009
 --> EXTENDED edition, 8-32 bit int, 16-32 bit float, 32k code
test\sample1.c:
 24. Jun 2009  11:04
 Chip = 16C54
 RAM: 00h : -------= .6****** ******** ********
RAM usage: 3 bytes (1 local), 22 bytes free
 File 'sample1.fcs'
 Optimizing - removed 3 instructions (-11 %)
 File 'sample1.var'
 File 'sample1.asm'
 File 'sample1.lst'
 File 'sample1.cod'
 File 'sample1.occ'
 File 'sample1.hex'
Total of 24 code words (4 %)

SAMPLE1.ASM

; CC5X Version 3.4, Copyright (c) B Knudsen Data
; C compiler for the PICmicro family
; ************  24. Jun 2009  11:04  *************

	processor  16C54
	radix  DEC

PORTB       EQU   0x06
Carry       EQU   0
a           EQU   0x08
in          EQU   0
out         EQU   1
i           EQU   0x07

  ; FILE test\sample1.c
			;
			;/* global variables */
			;char a;
			;bit b1, b2;
			;
			;/* assign names to port pins */
			;bit in  @ PORTB.0;
			;bit out @ PORTB.1;
			;
			;void sub( void)
			;{
sub
			;    char i;      /* a local variable */
			;
			;    /* generate 20 pulses */
			;    for ( i = 0; i < 20; i++)  {
	CLRF  i
m001	MOVLW 20
	SUBWF i,W
	BTFSC 0x03,Carry
	GOTO  m002
			;        out = 1;
	BSF   0x06,out
			;        nop();
	NOP  
			;        out = 0;
	BCF   0x06,out
			;    }
	INCF  i,1
	GOTO  m001
			;}
m002	RETLW 0
			;
			;
			;
			;void main( void)
			;{
main
			;    // if (TO == 1 && PD == 1 /* power up */)  {
			;    //   WARM_RESET:
			;    //     clearRAM(); // clear all RAM
			;    // }
			;
			;    /* NOTE 1: some devices have a comparator module
			;       that have to be switched off to use certain
			;       pins as digital IO */
			;    //CMCON = 0x07;  // switch comparators off
			;
			;    /* NOTE 2: devices having AD converter may need to
			;       configure the pins assigned to 'in' and 'out' as
			;       digital IO */
			;    //ADCON1 = ..
			;
			;    /* First decide the initial output level on the
			;       output port pins, and then define the input/
			;       output configuration. This avoids spikes at the
			;       output pins. */
			;
			;    PORTB = 0b.0000.0010;  /* out = 1 */
	MOVLW 2
	MOVWF PORTB
			;    TRISB = 0b.1111.0001;  /* xxxx 0001 */
	MOVLW 241
	TRIS  PORTB
			;
			;    a = 9;  /* value assigned to global variable */
	MOVLW 9
	MOVWF a
			;
			;    do  {
			;        if (in == 0)  /* stop if 'in' is low */
m003	BTFSS 0x06,in
			;             break;
	GOTO  m004
			;        sub();
	CALL  sub
			;    } while ( -- a > 0);  /* 9 iterations */
	DECFSZ a,1
	GOTO  m003
			;
			;    // if (some condition)
			;    //    goto WARM_RESET;
			;
			;    /* main is terminated by a SLEEP instruction */
			;}
m004	SLEEP

	ORG 0x01FF
	GOTO main
	END


; *** KEY INFO ***

; 0x0000   11 word(s)  2 % : sub
; 0x000B   12 word(s)  2 % : main

; RAM usage: 3 bytes (1 local), 22 bytes free
; Maximum call level: 1
; Total of 24 code words (4 %)

SAMPLE1.FCS

CC5X Version 3.4, Copyright (c) B Knudsen Data.
* FUNCTION CALL STRUCTURE

F: sub                    :#1 

F: main                   :#0 
    sub                   : #1 


 L0  main
 L1    sub

SAMPLE1.VAR

CC5X Version 3.4, Copyright (c) B Knudsen Data
 * VARIABLE LIST FILE
Source 'test\sample1.c'
Chip = 16C54

Sorted by address.

X    := P:direct assigned, L:local, G:global, E:extern, R:overlapping, C:const
B    := bank
Size := number of bytes
#AC  := number of direct accesses

 X  B  Address  Size  #AC   Name
 P  -  0x000      1  :  0:  INDF
 P  -  0x001      1  :  0:  TMR0
 P  -  0x002      1  :  0:  PCL
 P  -  0x003      1  :  0:  STATUS
 P  -  0x003.0    0  :  1:  Carry
 P  -  0x003.1    0  :  0:  DC
 P  -  0x003.2    0  :  0:  Zero_
 P  -  0x003.3    0  :  0:  PD
 P  -  0x003.4    0  :  0:  TO
 P  -  0x003.5    0  :  0:  PA0
 P  -  0x003.6    0  :  0:  PA1
 P  -  0x003.7    0  :  0:  PA2
 P  -  0x004      1  :  0:  FSR
 P  -  0x004.5    0  :  0:  FSR_5
 P  -  0x004.6    0  :  0:  FSR_6
 P  -  0x005      1  :  0:  PORTA
 P  -  0x006      1  :  2:  PORTB
 P  -  0x006.0    0  :  1:  in
 P  -  0x006.1    0  :  2:  out
 L  -  0x007      1  :  3:  i
 G  -  0x008      1  :  2:  a
 G  -  0x009.0    0  :  0:  b1
 G  -  0x009.1    0  :  0:  b2

End line