8MHz/3.3V Cannot upload over UART with optiboot but can with Arduino bootloader

brolly759 commented 3 years ago

Running into a strange issue where the optiboot bootloader refuses to upload code over USB/UART but works find with default Arduino Pro Mini 3.3v/8MHz board settings and bootloader.

Hardware: Custom PCB (ATMEGA328P-MU-ND) and Programmer (cp2102N) ALT Hardware: 2 Arduino Nano Pro Mini's + FTDI Arduino IDE 1.8.12 avrdude: Version 6.3-20190619

I am using the board manager with v8.0 optiboot. I select optiboot on 32-pin MCUs I select 8MHz(int) I use Arduino as ISP to upload bootloader to other Arduino Nano's and custom PCB.

Uploading to Arduino Nano Pro Mini, everything works. I can upload firmware over UART/USB using an FTDI chip with latest optiboot settings.
Uploading to Custom PCB with custom programmer, cannot upload new FW over USB/UART.
I used AVRDUDE to push a FW+Bootloader with serial.print() and the program is running/going into the void setup/loop functions so its not locked.
I have a 10K pullup from RESET pin to VCC.
Thinking it was a timing issue, I changed the DTR capacitor to 1uF, .1uF, .01uF, no difference.

At this point I would figure that its a hardware issue but I load the original bootloader (non optiboot) from Arduino IDE and everything works fine and I can upload over UART/USB.

So what am I missing? Is there something in the bootloader that is checking for pin states? Is there still a timing issue somewhere? Why would the non optiboot bootloader work? I even thought it was an issue with the LED start up routine so I built my own bootloader with this command: make UART=1 AVR_FREQ=8000000L BAUD_RATE=19200 LED_START_FLASHES=0 atmega328. I also tested MiniCore and same issues.

Any help would be appreciated!

     System wide configuration file is "C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf"

     Using Port                    : COM22
     Using Programmer              : arduino
     Overriding Baud Rate          : 57600
     AVR Part                      : ATmega328P
     Chip Erase delay              : 9000 us
     PAGEL                         : PD7
     BS2                           : PC2
     RESET disposition             : dedicated
     RETRY pulse                   : SCK
     serial program mode           : yes
     parallel program mode         : yes
     Timeout                       : 200
     StabDelay                     : 100
     CmdexeDelay                   : 25
     SyncLoops                     : 32
     ByteDelay                     : 0
     PollIndex                     : 3
     PollValue                     : 0x53
     Memory Detail                 :

                              Block Poll               Page                       Polled
       Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
       ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
       eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff
       flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff
       lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
       hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
       efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
       lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
       calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
       signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

     Programmer Type : Arduino
     Description     : Arduino

avrdude: stk500_recv(): programmer is not responding avrdude: stk500_recv(): programmer is not responding Hardware Version: 4744608 Firmware Version: 8.4611299 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_recv(): programmer is not responding avrdude: stk500_recv(): programmer is not responding Vtarget : 420030.5 V Varef : 0.3 V Oscillator : 921.600 kHz SCK period : 10844687.6 us

avrdude: stk500_recv(): programmer is not responding avrdude: stk500_recv(): programmer is not responding avrdude: initialization failed, rc=-1 Double check connections and try again, or use -F to override this check.

avrdude done. Thank you.

Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

brolly759 commented 3 years ago

Update. I changed the USB programmer from the CP2102N to the FTDI, added a 100nF Cap to DTR and I can program over USB now. So there is something wrong with the CP2102N wiring, driver or chipset itself? Strange that 1 bootloader works on 1 programmer and the other works with another bootloader?

cimba007 commented 3 years ago

Have the same problem here. Still investigating.

Edit: Solved my issue by Checking all the Wiring. Most noteworthy the reset was not working when I opened a serial terminal. After flashing the bootloader the bootloader will be active and thus first upload always worked for me.

WestfW commented 3 years ago

Exactly which .hex file or build options are you using? 57600 is one of the bit rates that isn't exact at 8Mz (about 2.1% off) and it's possible that some USB/Serial converters might be off in the OTHER direction, causing problems.

Optiboot / optiboot

8MHz/3.3V Cannot upload over UART with optiboot but can with Arduino bootloader #303