MCLoader & XPort

[Joe Rocci]

Jumper,

I made the .lib modification and modified your code to read back 16 memory locations starting at 60106. Data coming back from the read is all FF's, so it looks like there's no program located there.

Comments?

Joe

================================================== ======

DEFINE MAKE_LOADER 1 'Code will begin at 60160


DEFINE HSER_RXSTA 90h
define HSER_TXSTA 24h
DEFINE HSER_BAUD 9600
define OSC 8
OSCCON = $FF
TRISB=%00111111
TRISC=%10111111


RB6 var PORTB.6
RB7 var PORTB.7

TX Var PORTC.6
RX Var PORTC.7
'************************************************* ********************************************
I VAR BYTE
x var byte
Flash var word
Temp var word

'************************************************* ********************************************

Goto INIT


'************************************************
jump_back:
'Flash=64
'READCODE flash, temp 'Read the value at Flash adr
'IF temp=$FFFF then STOP 'If it is $FFFF we have no application code in the PIC so STOP
'@ GOTO 0x0040 'Start application
'*************************************************

'Here we decide if we should enter the Loader or not receiving a byte.

INIT: Pause 200 'wait for things to settle
Rb6=1 'indicate we are waiting for a character
HSERin [x] 'if nothing after 5 sek go to jump_back
if x="L" then
PAUSE 100
Goto Loader
ENDIF 'If it is what we want to get then enter the laoder
goto Jump_Back 'everything else jump_back

'************************************************* ****************

Loader:
FOR I = 0 TO 15
READCODE (60610 + I),X
hserout [$0D, $0A, ":", HEX(X)," "]
NEXT I
RB7=1 'Indicate we have entered the Loader
RB6=0
pause 200

'Here we can recieve new data and write it to the FLASH
'Erase before writing and write full blocks 64 bytes
'

goto Jump_Back 'When finished goto
END
'************************************************* ********

[Jumper]

Check this part:

FOR I = 0 TO 15
READCODE (60610 + I),X <--------------- wrong
hserout [$0D, $0A, ":", HEX(X)," "]
NEXT I


should be READCODE (60160+i),X

But there is something else too, I need to check some things..... gimme half an hour

/me

[Joe Rocci]

Jumper,

Well, while I fail to see any syntactical or other error in the way I wrote the line, I did cut-paste your suggested line into my program - no change

Am I failing to understand something about how READCODE works, or is there no code at the memory locations where there should be code?

Joe

[Jumper]

Try the original HIJACKING way since I couldn't get it to work with our own DEFINE the second time I tried it.

If you are using MPLAB you can look under view and program memory to see what your code looks like.

Try the original approach:

1: Change the LOADER_USED line in the LIB
2: DEFINE LOADER_USED 1 in your code
3: Compile
4: Check program memory, there should be code in position 0 and 2 then FFFF until $EB00

Syntax in PBP can be a little bit tricky. Some functions don't really like that you have a formula as argument. They want to have a WORD or BYTE only.

/me

[Jumper]

DEFINE LOADER_USED 1
DEFINE HSER_RXSTA 90h
define HSER_TXSTA 24h
DEFINE HSER_BAUD 9600

This is with the DEFINE LOADER_USED in the lib file like this

ifdef LOADER_USED
LIST
ORG 60160 ; Own loader address
NOLIST
endif

Any luck now??

/me

[Joe Rocci]

Jumper,

It seems like that's better. Here is dump result:
:4
:0
:9E
:AA
:FD
7
:AE
:50
8
:80
:E1
:EF
:75
:F0
:E9
:50

But we should be able to do this with a custom DEFINE, no??

Joe

[Jumper]

I didn't really look into this because I never use any other loaders but maybe this forum can come up with an answer.

This will not be solved today since we have passed Midnight a long time ago here.

Maybe moving this to a new thread might be a good idea after we have solved these problems. Then all our misstakes will be forgotten......

/me