Objective Development Forums

ulao wrote:what's funny about that is I had that same misunderstanding.
http://www.avrfreaks.net/index.php?name ... bootloader
Guess who helped me?

Though I completely over looked that.

So funny! Sometimes... well almost all the times it's something obviously simple but forgotten...

Cheers everyone!

Guys... this is a basic mistake; if the bootloader is set to 0x3800... this is counted in "words". When you move the origin of the program, it's counted in "bytes" (2x) sooo when you set the bootloader start address, it's 2x 0x3800 = 0x7000. End of the story. Thanks to clawson@av...

Here you go. P.S. I changed the boot address to $3800 main.elf: file format elf32-avr SYMBOL TABLE: 00003800 l d .text 00000000 .text 00800100 l d .bss 00000000 .bss 00820000 l d .fuse 00000000 .fuse 00830000 l d .lock 00000000 .lock 00840000 l d .signature 00000000 .signature 00000000 l d .debug_ar...

Hey, I tried some things today. I have another board using a atmega328p. I'm 100% sure this one is powered/decoupled properly. I wrote a simple bootloader application. I moved that application to 0x3C00 + fuses to start bootloader at $3C00 and BOOTRST set. This application turns on a led and loop. I...

I ordered some atmega168a from digikey. Looks like 168 has been corrected for... things... thus they issued a new part number with an "a". It is not a picopower. This is the first time I deal with bootloader with picopower atmega. I'll try to correct the board just to prove that it's the i...

So... you're saying that I can use an Atmega168 and I should not have any issue like i'm having right now? I'll give it a try, since my PCB is already setup at my PCB fab. I would save some $$$.

Thanks!

Here are the picture of the board and the schematic:





Maybe there are 1 or 2 caps missing.

Thanks vouvoume for clarifying that.

Do you know any issues or particularities with atmega328p bootloader versus atmega8 ?
I'm puzzled.

This is something wrong. According to the documentation, for a 328p it should be direct jump with "jmp 0x????" and not an indirect rjump. Do you know how to change that?

I'm seeing something pretty wierd... Interrupt vectors looks different for atmega8 and atmega328p; atmega8: 00001800 <__vectors>: 1800: 50 c0 rjmp .+160 ; 0x18a2 <__ctors_end> 1802: 84 c0 rjmp .+264 ; 0x190c <__vector_1> 1804: 69 c0 rjmp .+210 ; 0x18d8 <__bad_interrupt> 1806: 68 c0 rjmp .+208 ; 0x18...

Tried it with 0x3C00... Same deal I'm pretty sure it's a memory location issue for... something. It's booting fine since trigging my button change the way it reacts. The USB driver needs INT0 to work. I suspect the interrupt routine to not be called properly with this chip or there is a compiler err...

Table 28-6. Extended Fuse Byte for ATmega328/328P Extended Fuse Byte Bit No Description Default Value – 7 – 1 – 6 – 1 – 5 – 1 – 4 – 1 – 3 – 1 BODLEVEL2(1) 2 Brown-out Detector trigger level 1 (unprogrammed) BODLEVEL1(1) 1 Brown-out Detector trigger level 1 (unprogrammed) BODLEVEL0(1) 0 Brown-out De...

For a 1024 word bootloader section on the 328p, the bootloader needs to be compiled such that it starts at $3C00, give it a try Also I was pretty certain BOOTSZ0 had to be unchecked. Are you migrating from a 168? I think it was $3800 for a 168 chip ( easy mistake ), also the 328 swapped BOOTSZ &...

Hi Nitz, I though you were not a fan of low speed devices? Either way welcome to the v-usb project ( one year late ). I had this same issue I see you set the make/environment settings for 0x3c00 did you also match the fuses( not at a system that I can check that on right now ) and burn at the top o...

Update:

When I turn on TEST_MODE, put the bootloader origin to 0x0 and turn off the BOOTRST option in the fuse, it works...

Hummm... someting wrong with the bootflash mode and vectors...

Any suggestion?

Nitz