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ralcesar
Joined: 25 Jul 2009
Posts: 2
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| Error 27 and 88 |
 Posted: Sat Jul 25, 2009 6:19 pm |
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Hello, I am trying to compile my code but I have 2 error that I can't solve.
Error 27 "xx.c" Line 93 - expression must evaluate to a constant mrx_buffer2
and
Error 88 "xx.c" Line 351 - undefined label that was used in GOTO > mrx_chk_buf
The last code line used is 349. I check there is not code below the end of the main.
Some help please 
| Code: |
// Programa para recibir por RF 2 bytes aplicando codificacion Manchester
// Modificado a partir del codigo de el@jap.hu | http://jap.hu/electronic/
// pin TX RB1 (pin 7) 0x06,1
#include<18f452.h>
#use delay (clock=4000000)
#FUSES NOWDT, WDT128, XT, NOPROTECT, NOOSCSEN, BROWNOUT, BORV20, NOPUT, STVREN,
#FUSES NODEBUG, LVP, NOWRT, NOWRTD, NOWRTB, NOWRTC, NOCPD, NOCPB, NOEBTR, NOEBTRB
#byte pc=0xF82 // PUERTO C
#bit RX=pc.3 // entrada para el receptor de RF
// Constantes
#define EXPIRE_TIMER = 0x12
#define LATCH_MASK = 0xff
#define VALID_BIT = 0x4
#define hdrcntmin = 0x0c // minimum number of header bits to receive
#define hdrcntmax = 0x10 // maximum number of header bits to receive
// decoder time tolerances are set at : 0.5T, 1.5T, 2.5T
// measured in 9xinstr.time (9usec) counts
#define T = 0x27 // (d'27') half frame 350 usec (= T * 9 usec)
#define min_t = T/2 // half frame (T) minimum time
#define min_2t = 3*T/2 // half frame (T) maximum time and full frame (2T) minimum time
#define max_2t = 5*T/2 // full frame (2T) maximum time
#define packet_len = 3 // packet length, check var. alloc!
#define mrx_packet_len = 3 // packet length, check var. alloc!
// normal decoder logic input
//#define SKL btfsc
//#define SKH btfss
// FLAGS
int8 flags; //decode logic status
#bit IF_SHORT = flags.0
#bit FIRST_HALF = flags.1
#bit HEADER = flags.2
#bit VALID = flags.7
#define if_short_val= 1 // bit value of IF_SHORT flag
#define first_half_val= 2 // bit value of FIRST_HALF flag
//Variables
int8 bitcnt;
int8 tmrval; // timer value
int8 bt; // receive byte buffer
//int8 flags ; decode logic status
int8 btcnt; // byte counter
int8 mrx_buffer; // receive address buffer
int8 mrx_buffer1; // receive packet buffer
int8 mtx_buffer2;
int8 mrx_bsum; // receive buffer, checksum
int8 count; // used in looping routines
int8 count1; // used in delay routine
int8 counta; // used in delay routine
int8 countb; // used in delay routine
int8 tmp1; // temporary storage
int8 tmp2;
int8 Xmit_Byte; // holds byte to xmit
int8 Rcv_Byte; // holds received byte
int8 Bit_Cntr; // bit counter for RS232
int8 Delay_Count; // delay loop counter
int8 temp_ext_LSB, temp_ext_MSB;
// void temp_ext_low (void);
void main (void)
{
#asm
loop:
call mrx_receive // get packet
andlw 0xff
bnz loop // reject if error code
!!!!!!!!!!!!!!!!! call mrx_chk_buf // test the checksum value <-- label from ERROR 88
andlw 0xff
bnz loop // reject packet if checksum fails
movlw 0xAA // check that packet address is correct (0xAA)
subwf (mrx_buffer), W
bnz loop // else reject packet
// tienen cambiado mrx_buffer+1 por mrx_buffer1
movf mrx_buffer1,0 // get data byte byte
movwf temp_ext_LSB // el 1 es x nose q cosa de los bancos :p
!!!!!!!!!!!! movf mrx_buffer2,0 // get data byte byte <-- ERROR 27
movwf temp_ext_MSB
// seria goto fin, pero estaria bueno,enviar 3 veces el codigo y leerlo 3 veces
// y compararlos dsp para estarseguro q llegan bien, en lugar del final un loop
// 3 veces o englobar todo con un for idem en en emisor
goto final // loop // just display the bytes
// receive routines
mrx_receive: // receive a full manchester-encoded packet
s3: // set flags: first_half=1, if_short=0
bsf FIRST_HALF
s4: bcf IF_SHORT
s5: // init before the received packet
// set FSR to buffer start
movlw mrx_buffer
movwf FSR
// set byte counter
movlw (packet_len+1) // bytes / packet
movwf btcnt
// set header receive mode
bsf HEADER
clrf bitcnt // counting bit1-s in this mode
s2: // wait for a pulse
btfss RXBIT
goto s2
s6: // wait for end of (short) pulse up to min_2t
clrf tmrval
s6_w: btfss RXBIT
goto s7 // goto s7 at end of pulse
incf tmrval, F
nop
movlw min_2t
subwf tmrval, W
btfss STATUS, C
goto s6_w
// timeout, exit
retlw 1 // illegal startbit
s7: // start timer
clrf tmrval
s8: // if (if_short & rxbit) goto s9
// if (!if_short & !rxbit) goto s9
// goto s10
btfsc IF_SHORT
// if_short = 1
goto s8_ss1
s8_ss0: // if_short = 0
btfsc RXBIT
goto s10 // rxbit = 1, goto s10
s9_ss0: // if (timer > max_2t) exit - else goto s8
movlw max_2t
subwf tmrval, W
btfsc STATUS, C
retlw 2 // signal too long
incf tmrval, F
goto s8_ss0
s8_ss1: // if_short = 1
btfss RXBIT
goto s10 // rxbit = 0, goto s10
s9_ss1: // if (timer > max_2t) exit - else goto s8
movlw max_2t
subwf tmrval, W
btfsc STATUS, C
retlw 2 // signal too long
incf tmrval, F
goto s8_ss1
s10: // invert if_short
movlw if_short_val
xorwf flags, F
s11: // if (timer < min_t) exit
movlw min_t
subwf tmrval, W
btfss STATUS, C
retlw 3 // signal too short
s12: // if (timer < min_2t) goto s14
movlw min_2t
subwf tmrval, W
btfss STATUS, C
goto s14
s13: // if (first_half = 0) goto s16 - else exit
btfss FIRST_HALF
goto s16
retlw 4 // no mid-frame transition/out of sync
s14: // invert first_half
movlw first_half_val
xorwf flags, F
s15: // if (first_half = 1) goto 7
btfsc FIRST_HALF
goto s7
s16: // if_short is a decoded bit. Handle here
btfss HEADER
goto s16_not_header
// header receiving mode
btfss IF_SHORT
goto s16_header_end
// header bit is 1
btfss bitcnt, 4 // inc up to 16
incf bitcnt, F // 16 is enough...
#ifdef NOMAXHDR
// test for max header length
movlw hdrcntmax
subwf bitcnt, W
btfss STATUS, C
#endif
goto s7 // loop back
retlw 9 // header too long
s16_header_end: // header ends indicated by a 0
bcf HEADER
// test for min header length
movlw hdrcntmin
subwf bitcnt, W
btfss STATUS, C
retlw 0x0a // header too short
next_byte: movlw 0x0a
movwf bitcnt
goto s7 // loop back
s16_not_header: // receiving bytes
decf bitcnt, F
bz s16_s4 // if (bitcnt = 0) check for a byte-sep 1
// if (bitcnt = 1) check for a byte-separator 0
movlw 1
xorwf bitcnt, W
bnz s16_s2
// test for a byte separator 1
btfsc IF_SHORT
goto s7
retlw 7 // byte-ending 1 not present
s16_s2: // bit is data
rrf flags, W
rlf bt, F
goto s7
s16_s4: // check for a byte-separator 0
btfsc IF_SHORT
retlw 8 // byte-ending 0 not present
// OK, received byte is sane, store in buffer
movf bt, W
movwf INDF
incf FSR, F
decfsz btcnt, F
goto next_byte
retlw 0 // OK, buffer received
// buffer checking is not done automatically!
// if returned value is 0, call mrx_chk_buf to check
//
!!!!!!!!!!!!! mrx_chk_buf: // check buffer sanity by chksum <-- label from error 88
movlw mrx_buffer
movwf FSR
movlw (packet_len+1) // number of bytes with the chksum byte
movwf btcnt
movlw 0xff
movwf bt // used as sum register
chk0: movf INDF, W
// fast CRC-8 algorithm with poly x^8+x^5+x^4+1
// executes in 23 cycles per update
xorwf bt,f
clrw
btfsc bt,7
xorlw 0x7a
btfsc bt,6
xorlw 0x3d
btfsc bt,5
xorlw 0x86
btfsc bt,4
xorlw 0x43
btfsc bt,3
xorlw 0xb9
btfsc bt,2
xorlw 0xc4
btfsc bt,1
xorlw 0x62
btfsc bt,0
xorlw 0x31
movwf bt
incf FSR, F
decfsz btcnt, F
goto chk0
// correct checksum must be zero
movf bt, W
bnz chk_err
retlw 0 // result is in Z
chk_err: retlw 0x0c // checksum error
mrx_init: return
// delay routines
Delay255: movlw 0xff //delay 255 mS
goto d0
Delay100: movlw 0x64 //d'100' //delay 100mS
goto d0
Delay50: movlw 0x32 //d'50' //delay 50mS
goto d0
Delay20: movlw 0x14 //d'20' //delay 20mS
goto d0
Delay5: movlw 0x05 //delay 5.000 ms (4 MHz clock)
d0: movwf count1
d1: movlw 0xC7 //delay 1mS
movwf counta
movlw 0x01
movwf countb
Delay_0:
decfsz counta, f
goto delay_01
decfsz countb, f
delay_01: goto Delay_0
decfsz count1 ,f
goto d1
retlw 0x00
final: NOP
#endasm
}
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dyeatman
Joined: 06 Sep 2003
Posts: 1923
Location: Norman, OK
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| Posted: Sat Jul 25, 2009 7:03 pm |
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Unless I am missing it somewhere mrx_buffer2 is not defined, mTx_buffer2 is defined.
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Google and Forum Search are some of your best tools!!!! |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Jul 25, 2009 9:14 pm |
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| Quote: | define EXPIRE_TIMER = 0x12
#define LATCH_MASK = 0xff
#define VALID_BIT = 0x4
#define hdrcntmin = 0x0c // minimum number of header bits to receive
#define hdrcntmax = 0x10 // maximum number of header bits to receive |
There are no equal signs in #defines. |
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ralcesar
Joined: 25 Jul 2009
Posts: 2
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| Posted: Sun Jul 26, 2009 11:11 am |
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Thanks. I change those mistakes and some others and now its working  |
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