cac a xem giup e cai firmware này co van de j k?sao e dich ma no k nhận đc chip
Code:
radix DECLIST P=16F877A, F=INHX8M ; change also: Configure->SelectDevice from Mplab
include <p16f877a.inc>
xtal EQU 8000000 ; you may also want to change: _HS_OSC _XT_OSC
baud EQU 9600 ; standard TinyBld baud rates: 115200 or 19200
; The above 3 lines can be changed and buid a bootloader for the desired frequency (and PIC type)
;********************************************************************
; Tiny Bootloader 16FxxxA series Size=100words
; claudiu.chiculita@ugal.ro
; http://www.etc.ugal.ro/cchiculita/software/picbootloader.htm
;********************************************************************
#include "D:\tinybld198\picsource\icdpictypes.inc"
#include "D:\tinybld198\picsource\spbrgselect.inc"
#include "D:\tinybld198\picsource\bankswitch.inc"
#define first_address max_flash-100 ; 100 word in size
__CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _HS_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF
errorlevel 1, -305 ; suppress warning msg that takes f as default
cblock 0x20
buffer:80
endc
cblock 0x78
crc
contor
i
cnt1
cnt2
cnt3
flag
endc
SendL macro car
movlw car
movwf TXREG
endm
;0000000000000000000000000 RESET 00000000000000000000000000
ORG 0x0000
PAGESEL IntrareBootloader
GOTO IntrareBootloader
;view with TabSize=4
;&&&&&&&&&&&&&&&&&&&&&&& START &&&&&&&&&&&&&&&&&
;---------------------- Bootloader ----------------------
;
;PC_flash: C1h AddrH AddrL nr ...(DataLo DataHi)... crc
;PIC_response: id K K
ORG first_address
nop
nop
nop
nop
org first_address+4
IntrareBootloader
;init serial port
clrf STATUS
bsf STATUS,RP0 ;BANK1_
movlw b'00100100'
movwf TXSTA
movlw spbrg_value
movwf SPBRG
BANK0_
movlw b'10010000'
movwf RCSTA
;wait for computer
call Receive
sublw 0xC1 ;Expect C1
skpz
goto way_to_exit
SendL IdTypePIC ;PIC type
;SendL IdSoftVer ;firmware ver x
MainLoop
clrf STATUS ;bank0
SendL 'K'
mainl
clrf crc
call Receive ;H
bsf STATUS,RP1 ;bank2
movwf EEADRH
movwf flag ;used to detect if is eeprom
call Receive ;L
bsf STATUS,RP1 ;bank2
movwf EEADR
call Receive ;count
movwf contor
movwf i
incf i
movlw buffer-1
movwf FSR
rcvoct
call Receive
incf FSR
movwf INDF
decfsz i
goto rcvoct
movf crc,f ;check checksum
skpz
goto ziieroare
;write
bsf STATUS,RP1 ;bank switch 0->2
movlw buffer
movwf FSR
writeloop ; write 2 bytes = 1 instruction
clrwdt
movf INDF,w
movwf EEDATA
incf FSR
movf INDF,w
movwf EEDATH
incf FSR
BANK3_ ;bank 2->3
bcf EECON1,EEPGD
btfss flag,6 ;is eeprom (or flash)
bsf EECON1,EEPGD
bsf EECON1,WREN
movlw 0x55
movwf EECON2
movlw 0xaa
movwf EECON2
bsf EECON1,WR
nop
nop
waitwre
btfsc EECON1,WR ;for eeprom writes (wait to finish write)
goto waitwre
bcf EECON1,WREN
BANK2_ ;bank2
incf EEADR ;does not cross zones
btfss flag,6 ; if writing to EEPROM, skip first counter dec.
decf contor
decfsz contor
goto writeloop
goto MainLoop
ziieroare
SendL 'N'
goto mainl
Receive
clrf STATUS
movlw xtal/1000000+1 ; for 20MHz => 11 => 1second
movwf cnt1
rpt2
clrf cnt2
rpt3
clrf cnt3
rptc
btfss PIR1,RCIF ;test RX
goto $+4
movf RCREG,w ;return in W
addwf crc,f ;compute checksum
return
clrwdt
decfsz cnt3
goto rptc
decfsz cnt2
goto rpt3
decfsz cnt1
goto rpt2
;timeout:
way_to_exit ;exit in all other cases; must be BANK0/1
;BANK0_
bcf RCSTA, SPEN ; deactivate UART
goto first_address
;*************************************************************
; After reset
; Do not expect the memory to be zero,
; Do not expect registers to be initialised like in catalog.
END
e cung đã thử để nguyên dòng lệnh này
movlw xtal/2000000+1
như anh chính nói nhưng vẫn k đc.
anh chính cho e xin firmware cho con 16f877a.cấu hình như sau:
#fuses XT, NOWDT,PUT, NOPROTECT, NOLVP, NODEBUG, BROWNOUT
#use delay(clock=3579545)
e cảm ơn anh.