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problem with PIC16F877 [solved]
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2012-02-19, 06:32:07
(This post was last modified: 2012-12-25, 17:04:20 by Mikael Gustavsson.)
Everytime I want to program the chip a message comes up say no goto at org 0. What am I doing wrong. Please help. I am using latest ds30 bootloader and mplab to asemmble the bootloader file. I program the chip with ICD2.
2012-02-19, 13:33:24
Upload the hex file and I will take a look at it.
2012-02-19, 19:29:03
(2012-02-19, 06:32:07)antonadc Wrote: Everytime I want to program the chip a message comes up say no goto at org 0. What am I doing wrong. Please help. I am using latest ds30 bootloader and mplab to asemmble the bootloader file. I program the chip with ICD2.
2012-02-20, 13:08:37
2012-02-20, 22:23:22
Thank you. That was the bootloader right? I need your application hex file and preferably the source as well.
2012-02-21, 00:46:01
I have partially solved the problem. Firstly I discoverred to my horrer I had an old ds30 program. I re-installed the new program and it all seemed to work ok until I discovered that the 877 code will not work. Checking my hex file (From Proton+ crownhill ass) The first location for the 18 and 16 series is zero. This is to make way for the location 0 goto instruction. Not much I can do. The ds30 18 BL has one location open at 0 and that is for the goto. Now the ds30 bl for the 16 series has 3 bytes in it 2 for bank switching and the last for goto. Can the first 2 bytes not be removed and the goto put at 0? Please.
Thanks Anton
2012-02-22, 22:51:38
What do you mean by "the 877 code will not work"?
What is "Proton+ crownhill ass"? Upload or send me the application hex file and preferably the source as well. Regards Mikael
2012-02-22, 22:58:44
(2012-02-22, 22:51:38)Mikael Gustafsson Wrote: What do you mean by "the 877 code will not work"? It crashes on run with bl but if i program the hex file as is it works The crownhill ass is a picbasic compilor. http://www.protonbasic.co.uk done
2012-02-23, 17:01:59
(2012-02-23, 14:16:38)Mikael Gustafsson Wrote: Try with this setting: Sorry nothing works. I have programmed a small porgram to display a logo. When I program it directly into memory with ICD2 it works ok. With bootloader on or off and programming it with ds30 Bootloader the screen stays blank.
2012-02-23, 21:09:45
Do you use exactly the same configuration bits in the bootloader as in the application?
2012-02-24, 10:34:22
2012-02-24, 14:19:28
This was posted on the proton forum by another user
quote I don't know if Proton accounts for this or not when a program first starts up, but in the sources I have for the 16F both ds30loader.asm and umc_loader.asm leave the banksel set for bank1 prior to jumping to the user code. Most compilers assume it's set to 0 like it would normally be at poweron, so when your app runs the banksel isn't what it would normally be without a bootloader. unquote I hope this helps Anton
2012-02-28, 22:16:50
That might be an issue. I will look into it.
Have you compared the configuration bits?
2012-02-29, 01:39:53
2012-03-03, 23:06:50
Hi,
I have been busy with the commercial version. I will get back to this thread when I have time. You cold try to clear the pclat register the first thing in you code.
2012-03-04, 05:13:16
2012-03-06, 13:01:55
Sorry I didn't mean the PCLAT register, i meant the BANKSEL bits as you pointed out earlier. Something like this
Code: STATUS.RP0 = 0
2012-03-07, 02:49:22
(2012-03-06, 13:01:55)Mikael Gustafsson Wrote: Sorry I didn't mean the PCLAT register, i meant the BANKSEL bits as you pointed out earlier. Something like this Yipee found the problem it is the status file. ;--------------------------------------------------------------------- ; GOTO user application ;--------------------------------------------------------------------- org STARTADDR - 3 ;space to deposit goto application loadusr clrf STATUS <-- added this now all works ok ;nop ;page select, replaced by gui ;nop ;page select, replaced by gui ;nop ;goto, replaced by gui
2012-03-08, 12:49:29
Great! Thanks for helping out. I will add this fix to the package.
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