PIC12f1840 bootloader with jalv2

[Sunish Issac]

I was able to get the bootloader working on 12f1840, however looks like the
hex file overwrites the bootloader making it work only once.

There are compiler options that will let bootloaders like screamer/bloader
and Ric farmers's PIC loader work Also there's an option to force the first
instruction to be a long jump.
But none of it works. I would like to confirm if it's a bootloader or
compiler issue.

Regards,
Sunish

[Dan]

hello,Sunish

Although it is unknown whether this is the answer to,
This page did you see?

http://groups.yahoo.com/neo/groups/jallist/conversations/topics/26280

[Sunish Issac]

Hello Dan,
I tried the long jump option. But there's one more option left to be checked. There's also the possibility of a bug in the newer version of the compiler.
Since I don't have the devices to test, I'll update you once I finish my tests.

BTW, I happen to be the author of jaledit mentioned in the post.

Thanks,
Sunish

[Dan]

Hi,Sunish

I tried to makeup exam.

PRAGMA BOOTLOADER LONG_START

With the addition of the above syntax,

Can be carried compile that meets the Tiny AVR/PIC Bootloader+ (Tiny PIC Bootloader).

[Sunish Issac]

I'll try PRAGMA BOOTLOADER LONG_START tomorrow at office, but I already tried the long jump commandline option.

Thanks Dan,
Sunish

[Sunish Issac]

This is the result of the bootloader output of a hexfile programmed with pragma bootloader long_start

Check Device...
Open COM3 serial port at 19200bd
Software reseting Device
Found: 12F 1840
Open HEX file: D:\Dropbox\Projects\hw\PIC\JAL\NightOMatic\src\1307\12F1840_bootldrTestEEMap.hex
Hex file verified, OK
Warning: Config found just writing data
Warning: Config found just writing data
Warning: Config found just writing data
Warning: Config found just writing data
WARNING: pclath not fully initialised before GOTO! ...
WARNING: first 4 words of code could not be fixed
Maybe you should use some directive in your compiler
to enable the use of bootloaders
Transfering flash...
Transfering program memory...
Transfering EEPROM...
Transfert HEX successfull :-)
Close COM3 serial port

Afterwards program works but bootloader doesn't.

Here's the first 4 lines of the asm file
; 1 include 12f1840
org 0
movlp_nop HIGH lmain
goto lmain
nop
addwf v__pcl,f

Regards,
Sunish

[Dan]

Hi,Sunish

I tried even PIC12F1840.

Add 'PRAGMA BOOTLOADER LONG_START'

Absence of the interrupt routine,I think the bootloader and operating correctly in both cases.

[Case1:without INTERRUPT]

$0000 movlw XXX ;rewrite bootloader
$0001 movwf PCLAT ;rewrite bootloader
$0002 goto bootloader ;rewrite bootloader
$0003 movlb 3 ;(lmain) not rewrite
$0004 clrf v_ansela
v
v
bootloader
v
v
(:exit bootloader)
movlp HIGH lmain ;(source $0000)
goto l__main (->$0003) ;(source $0001)
nop ;(source $0002)
movlb ;(source $0003)

---

[Case2:with INTERRUPT]

$0000 movlw XXX ;rewrite bootloader
$0001 movwf PCLAT ;rewrite bootloader
$0002 goto bootloader ;rewrite bootloader
$0003 ??
$0004 movlb 0　　　　　;(INTERRUPT)
$0005 movlp HIGH l_identifier
$0006 goto l_identifier
$0007 movlb 3 ;(lmain)
$0008 clrf v_ansela
v
v
bootloader
v
v
(:exit bootloader)
movlp HIGH lmain ;(source $0000)
goto l__main (->$0007) ;(source $0001)
nop ;(source $0002)
movlb ;(source $0003)

---

[Sunish Issac]

Dan,

Thanks for the reply. I get this message

first 4 words of code could not be fixed.Maybe you should use some directive in your compiler enable the use of bootloaders

inspite of bootloader pragma.

But interestingly my primary problem is solved. What was happening was, I was using RTS reset which is not working reliably in the C# bootloader software. iam using RTS reset with a transistor to switch off and on the power of the PIC. If Iam using MCLR reset I have no issues in reprogramming. So your bootloader hex is perfect. However I suspect some issue with RTS reset of TinyPicboolad exe.

[Sunish Issac]

For anyone who's going to use TinyPicBootload+ with jal V2, just add these two lines to your code

pragma bootloader bloader
pragma fuses no

It works with the following log result

Hex file verified, OK
WARNING: pclath not fully initialised before GOTO! ...
Code sucessfully repaired.

Got the inspiration from the jal file of Valter, author of moleculine project
...

Sunish