ESP32 Forum

Posted: **Mon May 11, 2020 3:58 pm**

Hello,

I made a custom PCB following schematics of the ESP PICO D4 datasheet, made it printed and assembled by JLCPCB and I just received it but there is a problem.

When I connect my board UART to my computer I receive this continiously :

Code: Select all

17:48:47.012 -> rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
17:48:47.012 -> flash read err, 1000
17:48:47.046 -> ets_⸮⸮⸮⸮⸮⸮
17:48:47.385 -> 
17:48:47.385 -> rst:0x10 (⸮⸮⸮⸮⸮⸮-⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮?⸮⸮⸮P*⸮%==Q⸮
17:48:47.385 -> flash read err, 1000
17:48:47.385 -> ets_main.c 371 
17:48:47.385 -> 
17:48:47.757 -> rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASHGBGOT)
17:48:47.757 -> flash read err, 1000
17:48:47.757 -> ets_main.c 371 
17:48:47.791 ->

When I press my BOOT button (putting GPIO0 LOW), the receive message change to :

Code: Select all

17:57:13.830 -> rst:0x10 (RTCWDTORTCORESET),boot:0x3 (DOWNLOAD_BOOT(UART0/UART1/SDIO_REI_REO_V2))
17:57:13.830 -> waiting for download

but then I receive a continous flow of 0x00 and I can't transfer my program...

Do you have any idea of the issue ?

Thanks.

Posted: **Mon May 11, 2020 7:06 pm**

First logs usually means there is nothing flashed yet. So you need to flash some app to it.

Second logs means device is awaiting you flash something to it.

Posted: **Tue May 12, 2020 3:36 am**

As Chegewara says, the first message is normal for a chip trying to boot from empty flash (embedded flash in this case).

diyoio wrote: ↑
Mon May 11, 2020 3:58 pm
but then I receive a continous flow of 0x00 and I can't transfer my program...

There shouldn't be any output after the output you've received. Can you confirm with a logic analyzer that it's actually outputting a correctly formed serial stream of 0x00 bytes? Is it possible there is some assembly issue which is causing noise on the UART RX or TX?

ESP32 Forum

"flash read err, 1000" on custom ESP PICO D4 board

"flash read err, 1000" on custom ESP PICO D4 board

Re: "flash read err, 1000" on custom ESP PICO D4 board

Re: "flash read err, 1000" on custom ESP PICO D4 board