ATMEGA 2560 Bootloader works one time only, after uploading from USB, next Time not working

Development Tools Uploading
1

Hi, I'm using ATMEGA 2560 in our customized board. I'm using USBASP programmer and everything works fine when i downloading using usbasp programmer. i downloaded bootloader and it is successful. Then i removed programmer and uploaded using usb to serial connected to UART0, it successfully uploaded and works fine. Again if i upload the program using usb to serial board it is not responding. if i burn bootloader again it works for one time and repeating the same.
i tried to erase the chip and done fuse bits from avrdude cmd as follows still the problem exists

lockbits
lockbits716×622 15.4 KB

Full Chip Erase
avrdude -c usbasp -p m2560 -e

Set Fuse Bits 
avrdude -c usbasp -p m2560 -U lfuse:w:0xFF:m -U hfuse:w:0xD8:m -U efuse:w:0xFD:m

Write the Bootloader 
Tools > Burn Bootloader.

Set Lock Bits
avrdude -c usbasp -p m2560 -U lock:w:0x0F:m

Verify the Lock Bits
avrdude -c usbasp -p m2560 -U lock:r:-:i


following msg are the error msg during second time upload from usb to serial
     Using Port                    : COM16
         Using Programmer              : arduino
         Overriding Baud Rate          : 115200
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x0a
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x41
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x54

what shall i do retain the bootloader

2

do you reset the ATmega right before the upload starts?

1 Like
3

Is the Tx LED always on?

4

Which bootloader did you flash? The Avrdude output shows that you tried to communicate with it using the stk500v1 protocol (Optiboot bootloader, -c arduino), But the bootloader that the Arduino MEGA is shipped with uses the stk500v2 protocol.

If you're flashing the MEGA bootloader, try -c wiring instead. It show us the entire Avrdude command when you're flashing the bootloader.

5

Thank you for your reply, not yet tried before. reset switch is not working i will replace and update you.

6

Thanks for your reply, No, it is blinking while program upload given

7

Thanks for your reply, Actually it is not arduino board, ATMEGA2560 chip used in our customized board. I'm using Optiboot 8.0

8

Thank you very much it's working after reset

9

That most likely means that the auto-reset circuity either doesn't work like intended, or isn't present at all.

10

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