Re: ATMEGA328P on V-USB

2013-09-15T04:20:36+02:00

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!

Statistics: Posted by Nitz76 — Sun Sep 15, 2013 4:20 am

Re: ATMEGA328P on V-USB

2013-09-10T13:32:10+02:00

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.

Statistics: Posted by ulao — Tue Sep 10, 2013 1:32 pm

Re: ATMEGA328P on V-USB

2013-09-10T01:40:33+02:00

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@avrfreaks http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=1097841#1097841

And thank you all for your answers and toughts!!!

Statistics: Posted by Nitz76 — Tue Sep 10, 2013 1:40 am

Re: ATMEGA328P on V-USB

2013-09-09T15:47:01+02:00

Here you go.

P.S. I changed the boot address to $3800

Code:

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_aranges   00000000 .debug_aranges
00000000 l    d  .debug_pubnames   00000000 .debug_pubnames
00000000 l    d  .debug_info   00000000 .debug_info
00000000 l    d  .debug_abbrev   00000000 .debug_abbrev
00000000 l    d  .debug_line   00000000 .debug_line
00000000 l    d  .debug_frame   00000000 .debug_frame
00000000 l    d  .debug_str   00000000 .debug_str
0000387e l       .text   00000000 .do_clear_bss_start
0000387c l       .text   00000000 .do_clear_bss_loop
00000000 l    df *ABS*   00000000 main.c
0000003f l       *ABS*   00000000 __SREG__
0000003e l       *ABS*   00000000 __SP_H__
0000003d l       *ABS*   00000000 __SP_L__
00000034 l       *ABS*   00000000 __CCP__
00000000 l       *ABS*   00000000 __tmp_reg__
00000001 l       *ABS*   00000000 __zero_reg__
0000395e l       .text   00000000 __stop_program
0000388c  w      .text   00000000 __vector_22
0000392c g     F .text   00000018 __vector_1
00003868 g       .text   00000000 __trampolines_start
00003960 g       .text   00000000 _etext
0000388c  w      .text   00000000 __vector_24
0000388c  w      .text   00000000 __vector_12
0000388c g       .text   00000000 __bad_interrupt
00003960 g       *ABS*   00000000 __data_load_end
0000388c  w      .text   00000000 __vector_6
00003868 g       .text   00000000 __trampolines_end
0000388c  w      .text   00000000 __vector_3
0000388c  w      .text   00000000 __vector_23
00003960 g       *ABS*   00000000 __data_load_start
00003868 g       .text   00000000 __dtors_end
00800101 g       .bss   00000000 __bss_end
0000388c  w      .text   00000000 __vector_25
00840000 g     O .signature   00000003 __signature
00800100 g     O .bss   00000001 polarity
0000388c  w      .text   00000000 __vector_11
00003868  w      .text   00000000 __init
0000388c  w      .text   00000000 __vector_13
0000388c  w      .text   00000000 __vector_17
0000388c  w      .text   00000000 __vector_19
000038f2 g     F .text   0000003a __vector_7
00003874 g       .text   00000000 __do_clear_bss
00810000 g       .bss   00000000 __eeprom_end
00003800 g       .text   00000000 __vectors
00003800  w      .text   00000000 __vector_default
0000388c  w      .text   00000000 __vector_5
00003868 g       .text   00000000 __ctors_start
00800100 g       .bss   00000000 __bss_start
00003890 g     F .text   00000062 main
0000388c  w      .text   00000000 __vector_4
00830000 g     O .lock   00000001 __lock
00000000  w      *ABS*   00000000 __heap_end
0000388c  w      .text   00000000 __vector_9
00003944 g     F .text   00000018 __vector_2
0000388c  w      .text   00000000 __vector_21
0000388c  w      .text   00000000 __vector_15
00003868 g       .text   00000000 __dtors_start
00003868 g       .text   00000000 __ctors_end
000008ff  w      *ABS*   00000000 __stack
00800100 g       .text   00000000 _edata
00800101 g       .bss   00000000 _end
0000388c  w      .text   00000000 __vector_8
00820000 g     O .fuse   00000003 __fuse
0000395c  w      .text   00000000 exit
0000395c g       .text   00000000 _exit
0000388c  w      .text   00000000 __vector_14
0000388c  w      .text   00000000 __vector_10
0000388c  w      .text   00000000 __vector_16
0000388c  w      .text   00000000 __vector_18
0000388c  w      .text   00000000 __vector_20



Disassembly of section .text:

00003800 <__vectors>:
    3800:   0c 94 34 1c    jmp   0x3868   ; 0x3868 <__ctors_end>
    3804:   0c 94 96 1c    jmp   0x392c   ; 0x392c <__vector_1>
    3808:   0c 94 a2 1c    jmp   0x3944   ; 0x3944 <__vector_2>
    380c:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3810:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3814:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3818:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    381c:   0c 94 79 1c    jmp   0x38f2   ; 0x38f2 <__vector_7>
    3820:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3824:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3828:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    382c:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3830:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3834:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3838:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    383c:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3840:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3844:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3848:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    384c:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3850:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3854:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3858:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    385c:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3860:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>
    3864:   0c 94 46 1c    jmp   0x388c   ; 0x388c <__bad_interrupt>

00003868 <__ctors_end>:
    3868:   11 24          eor   r1, r1
    386a:   1f be          out   0x3f, r1   ; 63
    386c:   cf ef          ldi   r28, 0xFF   ; 255
    386e:   d8 e0          ldi   r29, 0x08   ; 8
    3870:   de bf          out   0x3e, r29   ; 62
    3872:   cd bf          out   0x3d, r28   ; 61

00003874 <__do_clear_bss>:
    3874:   11 e0          ldi   r17, 0x01   ; 1
    3876:   a0 e0          ldi   r26, 0x00   ; 0
    3878:   b1 e0          ldi   r27, 0x01   ; 1
    387a:   01 c0          rjmp   .+2         ; 0x387e <.do_clear_bss_start>

0000387c <.do_clear_bss_loop>:
    387c:   1d 92          st   X+, r1

0000387e <.do_clear_bss_start>:
    387e:   a1 30          cpi   r26, 0x01   ; 1
    3880:   b1 07          cpc   r27, r17
    3882:   e1 f7          brne   .-8         ; 0x387c <.do_clear_bss_loop>
    3884:   0e 94 48 1c    call   0x3890   ; 0x3890 
    3888:   0c 94 ae 1c    jmp   0x395c   ; 0x395c <_exit>

0000388c <__bad_interrupt>:
    388c:   0c 94 00 1c    jmp   0x3800   ; 0x3800 <__vectors>

00003890 :
    Parameters :    none
    Return values :   none
**************************************************************************************************************/
__attribute__ ((OS_main)) int main(void)
{
   MCUCR = (1 << IVCE);   // enable change of interrupt vectors 
    3890:   81 e0          ldi   r24, 0x01   ; 1
    3892:   85 bf          out   0x35, r24   ; 53
   MCUCR = (1 << IVSEL);   // move interrupts to bootloader flash section
    3894:   82 e0          ldi   r24, 0x02   ; 2
    3896:   85 bf          out   0x35, r24   ; 53

   //Input
   DDRD &= ~((1<    3898:   8a b1          in   r24, 0x0a   ; 10
    389a:   83 7f          andi   r24, 0xF3   ; 243
    389c:   8a b9          out   0x0a, r24   ; 10
   PORTD |= ((1<    389e:   8b b1          in   r24, 0x0b   ; 11
    38a0:   8c 60          ori   r24, 0x0C   ; 12
    38a2:   8b b9          out   0x0b, r24   ; 11

   //Output
   DDRD |= ((1<    38a4:   8a b1          in   r24, 0x0a   ; 10
    38a6:   80 6f          ori   r24, 0xF0   ; 240
    38a8:   8a b9          out   0x0a, r24   ; 10
   PORTD &= ~((1<    38aa:   8b b1          in   r24, 0x0b   ; 11
    38ac:   8f 70          andi   r24, 0x0F   ; 15
    38ae:   8b b9          out   0x0b, r24   ; 11

   // Set timer 2 for each second
   TCCR2A |= (1<    38b0:   80 91 b0 00    lds   r24, 0x00B0
    38b4:   82 60          ori   r24, 0x02   ; 2
    38b6:   80 93 b0 00    sts   0x00B0, r24
   TCCR2B |= ((1<    38ba:   80 91 b1 00    lds   r24, 0x00B1
    38be:   87 60          ori   r24, 0x07   ; 7
    38c0:   80 93 b1 00    sts   0x00B1, r24

   OCR2A=(unsigned char)((F_XTAL)/1024); // 1Hz
    38c4:   8f e1          ldi   r24, 0x1F   ; 31
    38c6:   80 93 b3 00    sts   0x00B3, r24

   TIMSK2 |= (1<    38ca:   80 91 70 00    lds   r24, 0x0070
    38ce:   82 60          ori   r24, 0x02   ; 2
    38d0:   80 93 70 00    sts   0x0070, r24

   TCNT2=0; // Restart timer 2
    38d4:   10 92 b2 00    sts   0x00B2, r1

   // Global variable init
   polarity=0;
    38d8:   10 92 00 01    sts   0x0100, r1

   // Enable interrupt on buttons
   EIMSK |= ((1<    38dc:   8d b3          in   r24, 0x1d   ; 29
    38de:   83 60          ori   r24, 0x03   ; 3
    38e0:   8d bb          out   0x1d, r24   ; 29
   EICRA |= ((1<    38e2:   80 91 69 00    lds   r24, 0x0069
    38e6:   8a 60          ori   r24, 0x0A   ; 10
    38e8:   80 93 69 00    sts   0x0069, r24

   sei();   // Enable interrupts
    38ec:   78 94          sei

   PORTD |= (1<    38ee:   5c 9a          sbi   0x0b, 4   ; 11
    38f0:   ff cf          rjmp   .-2         ; 0x38f0 

000038f2 <__vector_7>:
/*************************************************************************************************************
    Interruption:   TIMER2_COMPA_vect
    Description:   Happen each time TCNT2A = OCR2A (1 second)
**************************************************************************************************************/
ISR(TIMER2_COMPA_vect)
{
    38f2:   1f 92          push   r1
    38f4:   0f 92          push   r0
    38f6:   0f b6          in   r0, 0x3f   ; 63
    38f8:   0f 92          push   r0
    38fa:   11 24          eor   r1, r1
    38fc:   8f 93          push   r24
    38fe:   9f 93          push   r25
   // GreenLED flash
   polarity=polarity?0:1;
    3900:   80 91 00 01    lds   r24, 0x0100
    3904:   90 e0          ldi   r25, 0x00   ; 0
    3906:   88 23          and   r24, r24
    3908:   09 f4          brne   .+2         ; 0x390c <__vector_7+0x1a>
    390a:   91 e0          ldi   r25, 0x01   ; 1
    390c:   90 93 00 01    sts   0x0100, r25

   if(polarity)
    3910:   80 91 00 01    lds   r24, 0x0100
    3914:   88 23          and   r24, r24
    3916:   11 f0          breq   .+4         ; 0x391c <__vector_7+0x2a>
      PORTD |= (1<    3918:   5d 9a          sbi   0x0b, 5   ; 11
    391a:   01 c0          rjmp   .+2         ; 0x391e <__vector_7+0x2c>
   else
      PORTD &= ~(1<    391c:   5d 98          cbi   0x0b, 5   ; 11
}
    391e:   9f 91          pop   r25
    3920:   8f 91          pop   r24
    3922:   0f 90          pop   r0
    3924:   0f be          out   0x3f, r0   ; 63
    3926:   0f 90          pop   r0
    3928:   1f 90          pop   r1
    392a:   18 95          reti

0000392c <__vector_1>:
/*************************************************************************************************************
    Interruption:   INT0_vect 
    Description:   Happen each time But0 is pushed
**************************************************************************************************************/
ISR(INT0_vect)
{
    392c:   1f 92          push   r1
    392e:   0f 92          push   r0
    3930:   0f b6          in   r0, 0x3f   ; 63
    3932:   0f 92          push   r0
    3934:   11 24          eor   r1, r1
   PORTD |= ((1<    3936:   5e 9a          sbi   0x0b, 6   ; 11
   PORTD &= ~((1<    3938:   5f 98          cbi   0x0b, 7   ; 11
}
    393a:   0f 90          pop   r0
    393c:   0f be          out   0x3f, r0   ; 63
    393e:   0f 90          pop   r0
    3940:   1f 90          pop   r1
    3942:   18 95          reti

00003944 <__vector_2>:
/*************************************************************************************************************
    Interruption:   INT1_vect 
    Description:   Happen each time But1 is pushed
**************************************************************************************************************/
ISR(INT1_vect)
{
    3944:   1f 92          push   r1
    3946:   0f 92          push   r0
    3948:   0f b6          in   r0, 0x3f   ; 63
    394a:   0f 92          push   r0
    394c:   11 24          eor   r1, r1
   PORTD &= ~((1<    394e:   5e 98          cbi   0x0b, 6   ; 11
   PORTD |= ((1<    3950:   5f 9a          sbi   0x0b, 7   ; 11
}
    3952:   0f 90          pop   r0
    3954:   0f be          out   0x3f, r0   ; 63
    3956:   0f 90          pop   r0
    3958:   1f 90          pop   r1
    395a:   18 95          reti

0000395c <_exit>:
    395c:   f8 94          cli

0000395e <__stop_program>:
    395e:   ff cf          rjmp   .-2         ; 0x395e <__stop_program>

main.c

Code:

/*************************************************************************************************************
*    Title         : Test bootloader atmega328p
*    File         : main.c
*    SW Version   : 
*    HW Version   : 
*    MCU          : ATMEGA328P
*    Start date   : 9/9/2013
*    Update       : 
**************************************************************************************************************/

#include 
#include 

#include "fuses.h"

#define F_XTAL   32000

volatile unsigned char polarity;

/*************************************************************************************************************
    Function :      main  
    Description :   Main function
    Parameters :    none
    Return values :   none
**************************************************************************************************************/
__attribute__ ((OS_main)) int main(void)
{
   MCUCR = (1 << IVCE);   // enable change of interrupt vectors 
   MCUCR = (1 << IVSEL);   // move interrupts to bootloader flash section

   //Input
   DDRD &= ~((1<   PORTD |= ((1<
   //Output
   DDRD |= ((1<   PORTD &= ~((1<
   // Set timer 2 for each second
   TCCR2A |= (1<   TCCR2B |= ((1<
   ASSR |= (1<
   OCR2A=(unsigned char)((F_XTAL)/1024); // 1Hz

   TIMSK2 |= (1<
   TCNT2=0; // Restart timer 2

   // Global variable init
   polarity=0;

   // Enable interrupt on buttons
   EIMSK |= ((1<   EICRA |= ((1<
   sei();   // Enable interrupts

   PORTD |= (1<
   for(;;)   // Infinite loop
   {
   }
}

/*************************************************************************************************************
    Interruption:   TIMER2_COMPA_vect
    Description:   Happen each time TCNT2A = OCR2A (1 second)
**************************************************************************************************************/
ISR(TIMER2_COMPA_vect)
{
   // GreenLED flash
   polarity=polarity?0:1;

   if(polarity)
      PORTD |= (1<   else
      PORTD &= ~(1<}

/*************************************************************************************************************
    Interruption:   INT0_vect 
    Description:   Happen each time But0 is pushed
**************************************************************************************************************/
ISR(INT0_vect)
{
   PORTD |= ((1<   PORTD &= ~((1<}

/*************************************************************************************************************
    Interruption:   INT1_vect 
    Description:   Happen each time But1 is pushed
**************************************************************************************************************/
ISR(INT1_vect)
{
   PORTD &= ~((1<   PORTD |= ((1<}

fuses.h

Code:

/*************************************************************************************************************
*    Title :         Header file for fuses
*    File :          fuses.h
*************************************************************************************************************/

/*************************************************************************************************************
*   DEVICE = ATMEGA328P
*   FUSES = LOW = 0xC2, HIGH = 0xD8, EXTENDED = 0xFD
*   -----
*   BODLEVEL = 2.7V
*   RSTDISBL = NO
*   DWEN = NO
*   SPIEN = YES
*   WDTON = NO
*   EESAVE = YES
*   BOOTSZ = Boot Flash size=2048 words, Boot address 0x3800
*   BOOTRST = YES
*   CKDIV8 = NO
*   CKOUT = NO
*   SUT_CKSEL = Int.Crystal/Osc 8.0Mhz; 6CK/14CK + 0ms
*************************************************************************************************************/

/*************************************************************************************************************
*   LOCKBITS = 0xFC
*   --------
*   LB = FURTHER PROGRAMMING & VERIFICATION DISABLED
**************************************************************************************************************/

#include 
#include  

#ifndef FUSES_H
#define FUSES_H

__fuse_t __fuse __attribute__((section (".fuse"))) = 
{
    .low = 0xC2,
    .high = 0xD8,
   .extended = 0xFD,
};

unsigned char __lock __attribute__((section (".lock"))) = 0xFC;

#endif

Makefile

Code:

###############################################################################
# Makefile for the project main
###############################################################################

## General Flags
PROJECT = main
MCU = atmega328p
TARGET = main.elf
CC = avr-gcc

CPP = avr-g++

## Options common to compile, link and assembly rules
COMMON = -mmcu=$(MCU)

## Compile options common for all C compilation units.
CFLAGS = $(COMMON)
CFLAGS += -gdwarf-2 -std=gnu99 -DF_CPU=8000000UL -Os -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums  -Wall 
CFLAGS += -MD -MP -MT $(*F).o -MF dep/$(@F).d 

## Assembly specific flags
ASMFLAGS = $(COMMON)
ASMFLAGS += $(CFLAGS)
ASMFLAGS += -x assembler-with-cpp -Wa,-gdwarf2

## Linker flags
LDFLAGS = $(COMMON)
LDFLAGS +=  -Wl,--section-start=.text=0x3800  -Wl,-Map=main.map


## Intel Hex file production flags
HEX_FLASH_FLAGS = -R .eeprom -R .fuse -R .lock -R .signature

HEX_EEPROM_FLAGS = -j .eeprom
HEX_EEPROM_FLAGS += --set-section-flags=.eeprom="alloc,load"
HEX_EEPROM_FLAGS += --change-section-lma .eeprom=0 --no-change-warnings


## Objects that must be built in order to link
OBJECTS = main.o 

## Objects explicitly added by the user
LINKONLYOBJECTS = 

## Build
all: $(TARGET) main.hex main.eep main.lss size

## Compile
main.o: main.c
   $(CC) $(INCLUDES) $(CFLAGS) -c  $<

##Link
$(TARGET): $(OBJECTS)
    $(CC) $(LDFLAGS) $(OBJECTS) $(LINKONLYOBJECTS) $(LIBDIRS) $(LIBS) -o $(TARGET)

%.hex: $(TARGET)
   avr-objcopy -O ihex $(HEX_FLASH_FLAGS)  $< $@

%.eep: $(TARGET)
   -avr-objcopy $(HEX_EEPROM_FLAGS) -O ihex $< $@ || exit 0

%.lss: $(TARGET)
   avr-objdump -h -S $< > $@

size: ${TARGET}
   @echo
   @avr-size -C --mcu=${MCU} ${TARGET}

## Clean target
.PHONY: clean
clean:
   -rm -rf $(OBJECTS) main.elf dep/* main.hex main.eep main.lss main.map


## Other dependencies
-include $(shell mkdir dep 2>NUL) $(wildcard dep/*)

Statistics: Posted by Nitz76 — Mon Sep 09, 2013 3:47 pm

Re: ATMEGA328P on V-USB

2013-09-09T12:40:34+02:00

Nitz76 wrote:MCUCR = (1 << IVCE); /* enable change of interrupt vectors */
MCUCR = (1 << IVSEL); /* move interrupts to bootloader flash section */

Hi.
Can you please send us the complete objectdumped ("avr-objdump -Stdr main.elf > main.asm") firmware you have flashed?
And maybe a flash (readback) dump, too.

BR vouvoume

Statistics: Posted by Guest — Mon Sep 09, 2013 12:40 pm

Re: ATMEGA328P on V-USB

2013-09-09T03:54:38+02:00

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. It works.
I then added a led blinking fuction in interrupt. Works at 0x000 no problem.
When I move it to 0x3C00 and added;
MCUCR = (1 << IVCE); /* enable change of interrupt vectors */
MCUCR = (1 << IVSEL); /* move interrupts to bootloader flash section */
This function stop working.

Is there someting else to do?

Thanks!

Statistics: Posted by Nitz76 — Mon Sep 09, 2013 3:54 am

Re: ATMEGA328P on V-USB

2013-09-08T01:39:20+02:00

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 issue. I want to use the 328p in the future for other application since it's a very convenient size vs fuctionality.

Thanks guys! I'll let you know how it turns out.

Nitz

Statistics: Posted by Nitz76 — Sun Sep 08, 2013 1:39 am

Re: ATMEGA328P on V-USB

2013-09-07T23:53:20+02:00

You know I meant to bring that up, do you really need that much flash? The 168 is a very rock solid chip and easy to find without pico power. I have had great success with my 328's thus far. I never used a second bypass capacitor like that. Assuming its also near the mcu that good enough. I do put 27 pf around my oscillator though.

Statistics: Posted by ulao — Sat Sep 07, 2013 11:53 pm

Re: ATMEGA328P on V-USB

2013-09-07T20:05:23+02:00

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!

Statistics: Posted by Nitz76 — Sat Sep 07, 2013 8:05 pm

Re: ATMEGA328P on V-USB

2013-09-07T19:30:44+02:00

Here are the picture of the board and the schematic:

Maybe there are 1 or 2 caps missing.

Statistics: Posted by Nitz76 — Sat Sep 07, 2013 7:30 pm

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