I can not upload a sketch to my WiPy 3.0 using Arduino IDE.

[armant]

Any help would be appreciated. I get ```

A fatal error occurred: Failed to connect to ESP32: Invalid head of packet (0x08).

[armant]

@robert-hh I pulled it High externally and now it works. Thank you very much! Really appreciate your help.

[robert-hh]

@armant Can you pull GPIO0 high externally, push reset & look at the messages? And, b.t.w., how and at which Pin do you power the device?

[armant]

@robert-hh I managed to update the firmware again and get the serial working but again GPIO0 is not high this time and I can not program.

[armant]

This post is deleted!

[robert-hh]

@armant That is strange. At least the boot loader should come up with messages like:

ets Jun  8 2016 00:22:57

rst:0x1 (POWERON_RESET),boot:0x12 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff8028,len:8
load:0x3fff8030,len:2156
ho 0 tail 12 room 4
load:0x4009fa00,len:19208
entry 0x400a05f4

[armant]

@robert-hh Still could not make the connection
My baud is 115200, data bits 8 , stop bits 1, parity none and flow control none.

[robert-hh]

@armant With Putty you have to set flow control to None.

[armant]

@robert-hh said in I can not upload a sketch to my WiPy 3.0 using Arduino IDE.:

terminal emulator

I can not make the connection anymore. I tried Atom and PuTTy but got no message and failed to connect. I used to get some messages when I pushed the reset.

[robert-hh]

@armant That is still a message from the boot loader. if you just connect a terminal emulator at 115200 baud and push reset, which messages do you see?

[armant]

@robert-hh said in I can not upload a sketch to my WiPy 3.0 using Arduino IDE.:

Pycom update too

Thank you I have updated the firmware. GPIO0 is at high now but I get the following error when trying to upload a sketch : ```

A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header

[robert-hh]

@armant In that case, GPIO0 (alias P2), the 4th pin from the reset switch, should be high. It may be that the WiPy has firmware loaded. In that case you should upload a firmware. You do not need a specific board for that and you can use the Pycom update tool. Only the device must be in upload mode (GPIO0 low at reset time), which you device seems to be.

[armant]

@robert-hh I have just powered it up on a breadboard and connected a UART serial connection. Other than that nothing else is connected to it. As you have figured I am not using the standard expansion boards.

[robert-hh]

@armant No. At the time of Reset, GPIO0 must be high. I wonder why it is low at your device. Is anything connected to it?

[armant]

@robert-hh Thanks again. I have tired to pull it up with 6.8 kOhm resistor but still did not work. Is there any other way to get it out of update firmware mode?

[robert-hh]

@armant there must be something externally pulling it low. If not, pull it up with a resistor, e.g. 4.7 kOhm. The ESP has a weak pull-up for GPIO0, but that may not be sufficient, if something is connected to it.

[armant]

@robert-hh Thank you for the response. GPIO0 is low, how can I set it to High or how can I get out of this current mode?

[robert-hh]

@armant It looks like the WiPy is in firmware update mode. Please check the state of P2 (GPIO0). It must not be low for normal operation.