ceibawx
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Hi your help is needed.
input clock is 256khz, input bit data is 256kbps.20MHz is oscillator frequency for PIC16F877.
Why it doesn't pass compiling.
How to record bitdata in PIC?
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
MOVLW 0x08
MOVWF BitCounter ；bitcounter=8
MOVLW 0x0A
MOVWF ByteCounter ;bytecounter=9
MOVLW 0x00
MOVWF Data[ByteCounter] ;data[9]=0
; collect bit data on the rising edge.
;C0 IS CLOCK INPUT
;C1 IS BIT DATA INPUT
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Wait_To_1: BTFSS PORTC, 0 ; CLOCK value judge
goto Wait_To_1 ;CLOCK=0;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;CLOCK=1
RLF Data[ByteCounter]
; one clock comes, Data[ByteCounter] left shift，input bit data is stored into Data[ByteCounter]
BTFSC PORTC, 1 ;DATA VALUE
DECF Data[ByteCounter],1 ; or "NOP" ;DATA=0, SIKP
INCF Data[ByteCounter],1 ;DATA=1
Wait_To_0: BTFSC PORTC, 0
goto Wait_To_0 ;CLOCK=1
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;CLOCK=0
DECFSZ BitCounter, 1
;after decrease 1, if BitCounter value=0，then skip"goto Wait_To_1", to do"MOVLW 0x08, MOVWF BitCounter, DECFSZ ByteCounter, 1…". another data is stored.
goto Wait_To_1
MOVLW 0x08
MOVWF BitCounter ;bitcounter value=8;
DECFSZ ByteCounter, 1 ; ByteCounter decrease 1
;;;;;;;;;;after decrease 1, if ByteCounter value=0
goto NextByte ;ByteCounter = 1
goto TransData ;ByteCounter = 0
NextByte: MOVLW 0x00
MOVWF Data[ByteCounter]
goto Wait_To_1
TransData:
But when I added it to original assembly code. it doesn't work.
;********************************
list p=16f877 ; list directive to define processor
#include <p16f877.inc> ; processor specific variable definitions
; '__CONFIG' directive is used to embed configuration data within .asm file.
; The labels following the directive are located in the respective .inc file.
; See respective data sheet for additional information on configuration word.
; __CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _HS_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF
;***** VARIABLE DEFINITIONS
w_temp EQU 0x7D ; variable used for context saving
status_temp EQU 0x7E ; variable used for context saving
pclath_temp EQU 0x7F ; variable used for context saving
;**********************************************************************
ORG 0x000 ; processor reset vector
nop
goto Main ; go to beginning of program
;**********************************************************************
ORG 0x004 ; interrupt vector location
movwf w_temp ; save off current W register contents
movf STATUS,w ; move status register into W register
movwf status_temp ; save off contents of STATUS register
movf PCLATH,w ; move pclath register into w register
movwf pclath_temp ; save off contents of PCLATH register
; isr code can go here or be located as a call subroutine elsewhere
movf pclath_temp,w ; retrieve copy of PCLATH register
movwf PCLATH ; restore pre-isr PCLATH register contents
movf status_temp,w ; retrieve copy of STATUS register
movwf STATUS ; restore pre-isr STATUS register contents
swapf w_temp,f
swapf w_temp,w ; restore pre-isr W register contents
retfie ; return from interrupt
Main:
banksel TRISC
bcf TRISC,6
; UART module setup
banksel SPBRG
movlw 9
movwf SPBRG ; Enable SPBRG register for 9600 Baud Rate//this is wrong.
banksel TXSTA ; Select memory bank for TXSTA SFR
movlw b'00101110' ; UART Asynchronous mode, 8-bit transmission, High Baud Rate
movwf TXSTA ; Enable Transmission
banksel RCSTA
movlw b'10010000' ; Enable 8-bit reception
movwf RCSTA
bsf RCSTA,SPEN ; Enable Serial port
bsf RCSTA,CREN ; Enable Receiver
;MainLoop:
banksel TXREG
movlw 0x55
movwf TXREG ; Move the data to the transmit register
; Once, the data is moved to the transmit register
; it will transmit by itself
MainLoop
banksel RCREG
movf RCREG,W
movwf TXREG
goto MainLoop
END ; directive 'end of program'
;*************************************************************
Any suggestion is appreciated.
Added after 1 hours 45 minutes:
Hey,
I got the output data.
but one question is there are two output.
sometimes it is 0101010101.
Sometimes it is 0010101001.
What's the problem?
Can you see it for me?
;**********************************************************************
list p=16f877 ; list directive to define processor
#include <p16f877.inc> ; processor specific variable definitions
; '__CONFIG' directive is used to embed configuration data within .asm file.
; The labels following the directive are located in the respective .inc file.
; See respective data sheet for additional information on configuration word.
; __CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _HS_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF
;C0 IS CLOCK INPUT
;C1 IS BIT DATA INPUT
;***** VARIABLE DEFINITIONS
w_temp EQU 0x7D ; variable used for context saving
status_temp EQU 0x7E ; variable used for context saving
pclath_temp EQU 0x7F ; variable used for context saving
BitCounter EQU 0xBD ;vairable used for input bit data saving
ByteCounter EQU 0x3E ;vairable used for input bit data saving
bitData EQU 0xBF ;vairable used for input bit data saving
;**********************************************************************
ORG 0x000 ; processor reset vector
nop
goto Main ; go to beginning of program
;**********************************************************************
ORG 0x004 ; interrupt vector location
movwf w_temp ; save off current W register contents
movf STATUS,w ; move status register into W register
movwf status_temp ; save off contents of STATUS register
movf PCLATH,w ; move pclath register into w register
movwf pclath_temp ; save off contents of PCLATH register
; isr code can go here or be located as a call subroutine elsewhere
movf pclath_temp,w ; retrieve copy of PCLATH register
movwf PCLATH ; restore pre-isr PCLATH register contents
movf status_temp,w ; retrieve copy of STATUS register
movwf STATUS ; restore pre-isr STATUS register contents
swapf w_temp,f
swapf w_temp,w ; restore pre-isr W register contents
retfie ; return from interrupt
Main:
banksel TRISC
bcf TRISC,6
; UART module setup
banksel SPBRG
movlw 9
movwf SPBRG ; Enable SPBRG register for 9600 Baud Rate//this is wrong.
banksel TXSTA ; Select memory bank for TXSTA SFR
movlw b'00101110' ; UART Asynchronous mode, 8-bit transmission, High Baud Rate
movwf TXSTA ; Enable Transmission
banksel RCSTA
movlw b'10010000' ; Enable 8-bit reception
movwf RCSTA
bsf RCSTA,SPEN ; Enable Serial port
bsf RCSTA,CREN ; Enable Receiver
;recorddata
MOVLW 0x08
MOVWF BitCounter ;bitcounter=8
MOVLW 0x0A
MOVWF ByteCounter ;bytecounter=9
MOVLW 0x00
MOVWF bitData;[ByteCounter] ;bitdata[]=0
; collect bit data on the rising edge.
;*******************************************************************
Wait_To_1: BTFSS PORTC, 0 ; CLOCK value judge
goto Wait_To_1 ;CLOCK=0;
;****************************************************************CLOCK=1
RLF bitData;[ByteCounter]
; one clock comes, Data[ByteCounter] left shift,input bit data is stored into Data[ByteCounter]
BTFSC PORTC, 1 ;DATA VALUE
DECF bitData,1;[ByteCounter],1 ; or "NOP" ;DATA=0, SIKP
INCF bitData,1;[ByteCounter],1 ;DATA=1
Wait_To_0: BTFSC PORTC, 0
goto Wait_To_0 ;CLOCK=1
;****************************************************************CLOCK=0
DECFSZ BitCounter, 1
;after decrease 1, if BitCounter value=0,then skip"goto Wait_To_1", to do"MOVLW 0x08, MOVWF BitCounter, DECFSZ ByteCounter, 1…". another data is stored.
goto Wait_To_1
MOVLW 0x08
MOVWF BitCounter ;bitcounter value=8;
DECFSZ ByteCounter, 1 ; ByteCounter decrease 1
;;;;;;;;;;after decrease 1, if ByteCounter value=0
goto NextByte ;ByteCounter = 1
goto TransData ;ByteCounter = 0
NextByte: MOVLW 0x00
MOVWF bitData;[ByteCounter]
goto Wait_To_1
TransData:
;MainLoop:
banksel TXREG
;movlw 0x55
movf bitData,W
;movlw bitData
movwf TXREG ; Move the data to the transmit register
; Once, the data is moved to the transmit register
; it will transmit by itself
;MainLoop
;banksel RCREG
;movf RCREG,W
;movwf TXREG
;goto MainLoop
goto TransData
END ; directive 'end of program'
;*********************************************************************************************************************************************
input clock is 256khz, input bit data is 256kbps.20MHz is oscillator frequency for PIC16F877.
Why it doesn't pass compiling.
How to record bitdata in PIC?
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
MOVLW 0x08
MOVWF BitCounter ；bitcounter=8
MOVLW 0x0A
MOVWF ByteCounter ;bytecounter=9
MOVLW 0x00
MOVWF Data[ByteCounter] ;data[9]=0
; collect bit data on the rising edge.
;C0 IS CLOCK INPUT
;C1 IS BIT DATA INPUT
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Wait_To_1: BTFSS PORTC, 0 ; CLOCK value judge
goto Wait_To_1 ;CLOCK=0;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;CLOCK=1
RLF Data[ByteCounter]
; one clock comes, Data[ByteCounter] left shift，input bit data is stored into Data[ByteCounter]
BTFSC PORTC, 1 ;DATA VALUE
DECF Data[ByteCounter],1 ; or "NOP" ;DATA=0, SIKP
INCF Data[ByteCounter],1 ;DATA=1
Wait_To_0: BTFSC PORTC, 0
goto Wait_To_0 ;CLOCK=1
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;CLOCK=0
DECFSZ BitCounter, 1
;after decrease 1, if BitCounter value=0，then skip"goto Wait_To_1", to do"MOVLW 0x08, MOVWF BitCounter, DECFSZ ByteCounter, 1…". another data is stored.
goto Wait_To_1
MOVLW 0x08
MOVWF BitCounter ;bitcounter value=8;
DECFSZ ByteCounter, 1 ; ByteCounter decrease 1
;;;;;;;;;;after decrease 1, if ByteCounter value=0
goto NextByte ;ByteCounter = 1
goto TransData ;ByteCounter = 0
NextByte: MOVLW 0x00
MOVWF Data[ByteCounter]
goto Wait_To_1
TransData:
But when I added it to original assembly code. it doesn't work.
;********************************
list p=16f877 ; list directive to define processor
#include <p16f877.inc> ; processor specific variable definitions
; '__CONFIG' directive is used to embed configuration data within .asm file.
; The labels following the directive are located in the respective .inc file.
; See respective data sheet for additional information on configuration word.
; __CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _HS_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF
;***** VARIABLE DEFINITIONS
w_temp EQU 0x7D ; variable used for context saving
status_temp EQU 0x7E ; variable used for context saving
pclath_temp EQU 0x7F ; variable used for context saving
;**********************************************************************
ORG 0x000 ; processor reset vector
nop
goto Main ; go to beginning of program
;**********************************************************************
ORG 0x004 ; interrupt vector location
movwf w_temp ; save off current W register contents
movf STATUS,w ; move status register into W register
movwf status_temp ; save off contents of STATUS register
movf PCLATH,w ; move pclath register into w register
movwf pclath_temp ; save off contents of PCLATH register
; isr code can go here or be located as a call subroutine elsewhere
movf pclath_temp,w ; retrieve copy of PCLATH register
movwf PCLATH ; restore pre-isr PCLATH register contents
movf status_temp,w ; retrieve copy of STATUS register
movwf STATUS ; restore pre-isr STATUS register contents
swapf w_temp,f
swapf w_temp,w ; restore pre-isr W register contents
retfie ; return from interrupt
Main:
banksel TRISC
bcf TRISC,6
; UART module setup
banksel SPBRG
movlw 9
movwf SPBRG ; Enable SPBRG register for 9600 Baud Rate//this is wrong.
banksel TXSTA ; Select memory bank for TXSTA SFR
movlw b'00101110' ; UART Asynchronous mode, 8-bit transmission, High Baud Rate
movwf TXSTA ; Enable Transmission
banksel RCSTA
movlw b'10010000' ; Enable 8-bit reception
movwf RCSTA
bsf RCSTA,SPEN ; Enable Serial port
bsf RCSTA,CREN ; Enable Receiver
;MainLoop:
banksel TXREG
movlw 0x55
movwf TXREG ; Move the data to the transmit register
; Once, the data is moved to the transmit register
; it will transmit by itself
MainLoop
banksel RCREG
movf RCREG,W
movwf TXREG
goto MainLoop
END ; directive 'end of program'
;*************************************************************
Any suggestion is appreciated.
Added after 1 hours 45 minutes:
Hey,
I got the output data.
but one question is there are two output.
sometimes it is 0101010101.
Sometimes it is 0010101001.
What's the problem?
Can you see it for me?
;**********************************************************************
list p=16f877 ; list directive to define processor
#include <p16f877.inc> ; processor specific variable definitions
; '__CONFIG' directive is used to embed configuration data within .asm file.
; The labels following the directive are located in the respective .inc file.
; See respective data sheet for additional information on configuration word.
; __CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _HS_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF
;C0 IS CLOCK INPUT
;C1 IS BIT DATA INPUT
;***** VARIABLE DEFINITIONS
w_temp EQU 0x7D ; variable used for context saving
status_temp EQU 0x7E ; variable used for context saving
pclath_temp EQU 0x7F ; variable used for context saving
BitCounter EQU 0xBD ;vairable used for input bit data saving
ByteCounter EQU 0x3E ;vairable used for input bit data saving
bitData EQU 0xBF ;vairable used for input bit data saving
;**********************************************************************
ORG 0x000 ; processor reset vector
nop
goto Main ; go to beginning of program
;**********************************************************************
ORG 0x004 ; interrupt vector location
movwf w_temp ; save off current W register contents
movf STATUS,w ; move status register into W register
movwf status_temp ; save off contents of STATUS register
movf PCLATH,w ; move pclath register into w register
movwf pclath_temp ; save off contents of PCLATH register
; isr code can go here or be located as a call subroutine elsewhere
movf pclath_temp,w ; retrieve copy of PCLATH register
movwf PCLATH ; restore pre-isr PCLATH register contents
movf status_temp,w ; retrieve copy of STATUS register
movwf STATUS ; restore pre-isr STATUS register contents
swapf w_temp,f
swapf w_temp,w ; restore pre-isr W register contents
retfie ; return from interrupt
Main:
banksel TRISC
bcf TRISC,6
; UART module setup
banksel SPBRG
movlw 9
movwf SPBRG ; Enable SPBRG register for 9600 Baud Rate//this is wrong.
banksel TXSTA ; Select memory bank for TXSTA SFR
movlw b'00101110' ; UART Asynchronous mode, 8-bit transmission, High Baud Rate
movwf TXSTA ; Enable Transmission
banksel RCSTA
movlw b'10010000' ; Enable 8-bit reception
movwf RCSTA
bsf RCSTA,SPEN ; Enable Serial port
bsf RCSTA,CREN ; Enable Receiver
;recorddata
MOVLW 0x08
MOVWF BitCounter ;bitcounter=8
MOVLW 0x0A
MOVWF ByteCounter ;bytecounter=9
MOVLW 0x00
MOVWF bitData;[ByteCounter] ;bitdata[]=0
; collect bit data on the rising edge.
;*******************************************************************
Wait_To_1: BTFSS PORTC, 0 ; CLOCK value judge
goto Wait_To_1 ;CLOCK=0;
;****************************************************************CLOCK=1
RLF bitData;[ByteCounter]
; one clock comes, Data[ByteCounter] left shift,input bit data is stored into Data[ByteCounter]
BTFSC PORTC, 1 ;DATA VALUE
DECF bitData,1;[ByteCounter],1 ; or "NOP" ;DATA=0, SIKP
INCF bitData,1;[ByteCounter],1 ;DATA=1
Wait_To_0: BTFSC PORTC, 0
goto Wait_To_0 ;CLOCK=1
;****************************************************************CLOCK=0
DECFSZ BitCounter, 1
;after decrease 1, if BitCounter value=0,then skip"goto Wait_To_1", to do"MOVLW 0x08, MOVWF BitCounter, DECFSZ ByteCounter, 1…". another data is stored.
goto Wait_To_1
MOVLW 0x08
MOVWF BitCounter ;bitcounter value=8;
DECFSZ ByteCounter, 1 ; ByteCounter decrease 1
;;;;;;;;;;after decrease 1, if ByteCounter value=0
goto NextByte ;ByteCounter = 1
goto TransData ;ByteCounter = 0
NextByte: MOVLW 0x00
MOVWF bitData;[ByteCounter]
goto Wait_To_1
TransData:
;MainLoop:
banksel TXREG
;movlw 0x55
movf bitData,W
;movlw bitData
movwf TXREG ; Move the data to the transmit register
; Once, the data is moved to the transmit register
; it will transmit by itself
;MainLoop
;banksel RCREG
;movf RCREG,W
;movwf TXREG
;goto MainLoop
goto TransData
END ; directive 'end of program'
;*********************************************************************************************************************************************