ESP32 Forum

Posted: **Wed Oct 23, 2019 4:41 am**

Has anyone seen this before? It only happens on one of my two ESP32 boards. I don't think it was happening before, at least I never noticed it (I'm sure I would have) Is this a partially corrupted bootloader? (Ignore the date codes that were generated). If it was a baud rate issue then you wouldn't see the partial June date for example. Is there a way to fix this?

Code: Select all

[10-23 00:22:54.8]ets Jun  6 00:22§ÓSH¨
[10-23 00:22:55.2]áets Jun  ² 00:22:57
[10-23 00:22:55.2]C!®.ÂÅ0 (RTCÕ%E5}IMQ¥,¬ëé0x13 (SPIeST_FLASH_Bêj
[10-23 00:22:55.2]configsié 0, SPIWP:Âe
[10-23 00:22:55.2]clk_drv:0Á0,q_drv:0x00}drv:0x00,csúrv:0x00,hd_d.ÂÁ0,wp_drv:ÂÁ0
[10-23 00:22:55.2]mode:DIO,±½ck div:2
[10-23 00:22:55.2]ë+é0x3fff0018«¹é4
[10-23 00:22:55.2]load'ÂÍfff001c,«¹:6344
[10-23 00:22:55.2]load:ÂÑ0078000,len:LL¢
[10-23 00:22:55.2]load:0x40Â¢0,len:6648C¡Éå0x4008076SHøI (29) boot: ESP-IDF v3.3 2nd stage bootloader
[10-23 00:22:55.2]I (29) boot: compile time 14:46:47
[10-23 00:22:55.2]I (29) boot: Enabling RNG early entropy source...
[10-23 00:22:55.2]I (33) boot: SPI Speed      : 40MHz
[10-23 00:22:55.2]I (37) boot: SPI Mode       : DIO
[10-23 00:22:55.2]I (41) boot: SPI Flash Size : 4MB

Posted: **Thu Oct 24, 2019 1:11 am**

Well I can see how I may have caused the issue. With old age comes bad eyes. The GND pin that I thought I connected my logic analyzer to was actually the CMD pin of the ESP32 flash on my dev kit. Now I know why I was seeing crazy garbage on my SPI pins!
SPI is better now, but I still have the garbage as shown above.
From what I read, this is output from the 1st bootloader in ROM, not the external flash. Is this true? If so, I assume it can't be fixed.

Thanks.

Posted: **Thu Oct 24, 2019 2:27 am**

If you have a logic analyzer, check the bit width, the baud rate is probably slightly off, possibly due to unstable Crystal startup and frequency estimation.

ESP32 Forum

Garbage on only first lines of booloader output

Garbage on only first lines of booloader output

Re: Garbage on only first lines of booloader output

Re: Garbage on only first lines of booloader output