How can I call Bootloader from Basic programm?

[Kabron]

Hello Fiends!
I need to pass control to Bootloader(Shipped with MCLoader) from running basic program. I tryed the following: @ goto 0, - the basic program performed restart, but not to the Bootloader. What are the right conditions( jump address, flags, etc.)? Does anybody knows?

Thanks in advance.

[Faros]

Hi …
Can you identify which basic do you use …?  (Mikrobasic, PIC BASIC, PROTON BASIC ….)

[Kabron]

Hi …
Can you identify which basic do you use …? (Mikrobasic, PIC BASIC, PROTON BASIC ….)

Doesn't matter as the bootloader is the same. But if the definition play a role for you let it be PBP and Proton+ or pure assembler.

[Kabron]

The problem arised when I connected XPort to my project. As the XPort couldn't properly transmit DTR signal, I decide to watch for specific sequence in Rx stream ($E0..E0... in case of MCLoader) and pass control to Bootloader. So it will be possible to program the device distantly. But I'm afraid that Bootloader analyses the reset flags and do not starts in case of soft reset.

[Faros]

i have to try whatever i am going to post as a solution ... so I wanted as to be in the same boat ...

[Kabron]

OK now I solved it.

You should wait for null character(s) in serial stream (byte $00) and then execute the following code:

ASM

MOVLW 0x1F
MOVWF PCLATH
GOTO 0x70D
ENDASM

or simple @ GOTO 0 if you test it in the first 2K code segment.



The whole example:



DEFINE LOADER_USED 1 ' uses a bootloader
define OSC 20
DEFINE HSER_BAUD 115200

Char var byte

TXSTA.2=1

SPBRG=10
hserout ["Program Starting...",CR]
ProgramStart:
WHILE 1
CHAR=1
hserin 1,TIMEOUT,[Char]
Timeout:
IF CHAR=0 THEN
ASM
MOVLW 0x1F
MOVWF PCLATH
GOTO 0x70D
ENDASM
' @ GOTO 0 'if this code is in the 1st 2k segment
endif

WEND