Tiny Bootloader
in [Embedded]
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From: JohnT on 29 Aug 2006 02:55 Hi All, Has anyone manged to get the tiny bootloader from http://www.etc.ugal.ro/cchiculita/software/picbootloader.htm working? I have a 16F877A with a 4MHz crystal. I modified the frequency in the software and downloaded it with no problem. Running the software it discovers the PIC with no problem. However, I tried to create a simple program in assembler that would turn on all the outputs of Port B. I know my program works fine as I've downloaded it using a programmer. However, when I download it using the bootloader nothing happens. It appears that the PIC is 'stuck' in the bootloader section and not jumping to my code when it's done. I suspect this is the case as the bootloader software detects the PIC straight away without the need for me to reset the PIC. Any ideas anyone? John
From: RaceMouse on 29 Aug 2006 11:56 JohnT wrote: > Hi All, > > Has anyone manged to get the tiny bootloader from > http://www.etc.ugal.ro/cchiculita/software/picbootloader.htm working? > > I have a 16F877A with a 4MHz crystal. I modified the frequency in the > software and downloaded it with no problem. Running the software it > discovers the PIC with no problem. > > However, I tried to create a simple program in assembler that would > turn on all the outputs of Port B. I know my program works fine as > I've downloaded it using a programmer. However, when I download it > using the bootloader nothing happens. It appears that the PIC is > 'stuck' in the bootloader section and not jumping to my code when it's > done. > > I suspect this is the case as the bootloader software detects the PIC > straight away without the need for me to reset the PIC. > > Any ideas anyone? > > John > Greetings First: You don't download _TO_ something. you upload _TO_ a device ! (I really couldn't help it :-) ) Second : Have you made sure that you application program starts at the same address as the booloader jumps to when it does not receive a char from the PC ? /RaceMouse
From: Pietje Bell on 29 Aug 2006 11:56 Does the bootloader needs to know where the application is programmed? (at what address) -------- Origineel bericht -------- > Hi All, > > Has anyone manged to get the tiny bootloader from > http://www.etc.ugal.ro/cchiculita/software/picbootloader.htm working? > > I have a 16F877A with a 4MHz crystal. I modified the frequency in the > software and downloaded it with no problem. Running the software it > discovers the PIC with no problem. > > However, I tried to create a simple program in assembler that would > turn on all the outputs of Port B. I know my program works fine as > I've downloaded it using a programmer. However, when I download it > using the bootloader nothing happens. It appears that the PIC is > 'stuck' in the bootloader section and not jumping to my code when it's > done. > > I suspect this is the case as the bootloader software detects the PIC > straight away without the need for me to reset the PIC. > > Any ideas anyone? > > John >
From: larwe on 29 Aug 2006 12:03 RaceMouse wrote: > First: You don't download _TO_ something. you upload _TO_ a device ! > (I really couldn't help it :-) ) You'd have no idea how many arguments I've had about this. I agree with what you just said, but I've never been able to convince anyone else of this. It is common parlance that programming a chip is "downloading to" that chip.
From: RaceMouse on 29 Aug 2006 12:11
larwe wrote: > RaceMouse wrote: > > >>First: You don't download _TO_ something. you upload _TO_ a device ! >>(I really couldn't help it :-) ) > > > You'd have no idea how many arguments I've had about this. I agree with > what you just said, but I've never been able to convince anyone else of > this. It is common parlance that programming a chip is "downloading to" > that chip. > As long as you agree with me you're doing fine :-) The only way to change this "common parlance" is to use the correct terms. Agree ? -maybe the discussion belongs in an other thread but ... /RaceMouse |