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'SERIAL CODE PROBLEM'
1997\05\17@173409 by eric naus

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part 0 67 bytes
Attachment converted: wonderland:SERIAL.ASM (TEXT/MSIE) (00002DF9)

1997\05\19@062445 by STEENKAMP [M.ING E&E]

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Hi,

You do not call bit_delay after you have found the start bit.  This
causes all 8 data bits to be sampled in rapid succession.

Proposed correction:
.
.
.
start_bit   btfsc      ser_in,2
           goto       start_bit   ;look for start bit
           call       start_delay ;get centre of start bit
           btfsc      ser_in,2    ;look if still low
           goto       start_bit   ;false input start again

==>         call       bit_delay   ;Wait until middle of first data bit

           movlw      8           ;load counter for 8 bits
           movwf      bit_cntr
           clrf       rcv_byte    ;clear recieve byte
recieve     btfss      ser_in,2    ;get bit
           bcf        c,0         ;clear carry if bit is zero
           btfsc      ser_in,2
           bsf        c,0         ;set carry if bit is high
           rrf        rcv_byte,1  ;rotate carry to high bit in recieve
byte

==>         call       bit_delay   ;Wait until middle of next data bit

           decfsz     bit_cntr,1  ;if counter not finished get next bit
           goto       recieve
.
.
.

Hope this helps!
Niki

1997\05\19@125158 by eric naus

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Hi,

Thanks for pointing it out.
Appreciate the quick help.

Regards

Eric naus


At 12:14 PM 5/19/97 GMT+0200, you wrote:
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