Custom board, no serial data received error, but is able to go into download mode

anees.ahmad.jaffer
Posts: 11
Joined: Wed Sep 13, 2023 11:12 am

Custom board, no serial data received error, but is able to go into download mode

Postby anees.ahmad.jaffer » Wed Sep 13, 2023 11:25 am

I have made a custom board using the esp32-wroom-32d. Board powers on. Connecting to USB of my laptop, opening putty at 115200, the board starts with this message:

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ets Jun  8 2016 00:22:57

rst:0x1 (POWERON_RESET),boot:0x2 (DOWNLOAD_BOOT(UART0/UART1/SDIO_REI_FEO_V2))
waiting for download
When I press the button connected to the third pin on the MCU, RST, the board constantly resets, with the message:

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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:2
load:0x3fffeba4,len:4
load:0x4009f000,len:3248
entry 0x4009f574
▒OHAI▒
After that, if I press the button connected to IO0, pin 25, I get this message once:

Code: Select all

rst:0x10 (RTCWDT_RTC_RESET),boot:0x2 (DOWNLOAD_BOOT(UART0/UART1/SDIO_REI_FEO_V2))
waiting for download
When I try to upload code through PlatformIO, Arduino IDE, or WSL, it fails. The error in WSL is:

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esptool.py v3.3.2
Serial port /dev/ttyS19
Connecting......................................

A fatal error occurred: Failed to connect to ESP32: No serial data received.
For troubleshooting steps visit: https://docs.espressif.com/projects/esptool/en/latest/troubleshooting.html

ESP_Sprite
Posts: 9709
Joined: Thu Nov 26, 2015 4:08 am

Re: Custom board, no serial data received error, but is able to go into download mode

Postby ESP_Sprite » Thu Sep 14, 2023 12:38 am

Are you sure you don't have a terminal open while uploading? You can't have two programs on the same serial device, and the OHAI message does suggest that's what you have. (OHAI is a handshake for the flashing stub)

bidrohini
Posts: 202
Joined: Thu Oct 27, 2022 12:55 pm

Re: Custom board, no serial data received error, but is able to go into download mode

Postby bidrohini » Thu Sep 14, 2023 8:42 am

I think you must troubleshoot your PCB also. See if there is any broken trace or short circuit.

anees.ahmad.jaffer
Posts: 11
Joined: Wed Sep 13, 2023 11:12 am

Re: Custom board, no serial data received error, but is able to go into download mode

Postby anees.ahmad.jaffer » Thu Sep 14, 2023 8:47 am

ESP_Sprite wrote:
Thu Sep 14, 2023 12:38 am
Are you sure you don't have a terminal open while uploading? You can't have two programs on the same serial device, and the OHAI message does suggest that's what you have. (OHAI is a handshake for the flashing stub)
Hi. Yes, 100% sure. If I purposefully leave a terminal open, then try to flash it, the error specifically says access denied. I also closed all programs, restarted the laptop, just to make sure there's no open serial ports. Still get the error.

anees.ahmad.jaffer
Posts: 11
Joined: Wed Sep 13, 2023 11:12 am

Re: Custom board, no serial data received error, but is able to go into download mode

Postby anees.ahmad.jaffer » Thu Sep 14, 2023 8:57 am

bidrohini wrote:
Thu Sep 14, 2023 8:42 am
I think you must troubleshoot your PCB also. See if there is any broken trace or short circuit.
Hi. I've gone with a multimeter, checked that 5v, 3.3v and ground are not shorted. Check continuity from the USB programmer to the ESP chip's RX and TX pins. All that should be connected is connected, all that shouldn't be connected is not connected (from what I've tested). I've also tried cutting the traces for the GPIO's that I would've used for what this device would be used for. Still same error. I've tried soldering wires directly to the RX TX pins of the ESP, then connecting that to an FTDI programmer. No luck, but that may have been my soldering skills.

anees.ahmad.jaffer
Posts: 11
Joined: Wed Sep 13, 2023 11:12 am

Re: Custom board, no serial data received error, but is able to go into download mode

Postby anees.ahmad.jaffer » Thu Sep 14, 2023 11:16 am

Here are the schematics for my PCB:

Power schematic:
2.png
Power schematic
2.png (74.33 KiB) Viewed 4074 times
USB programmer schematic:
3.png
USB programmer schematic
3.png (102.32 KiB) Viewed 4074 times
Here is the PCB design:
5.png
PCB design
5.png (266.94 KiB) Viewed 4074 times
Note: the green lines are islands that were not filled correctly. I have taken a dremmel and cut these islands. Tested with a multimeter, the islands are no longer connected to the tracks, and the tracks are connected where they should be

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