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How to eliminate serial header?

Posted: Sun May 17, 2020 7:46 pm
by butchalline
I am using ESP32/NOW with Arduino IDE and printing incoming data to the Arduino IDE serial monitor.

Before my data appears, the following is printed on the serial monitor:

load:0x3fff001c,len:1216
ho 0 tail 12 room 4
load:0x40078000,len:9720
ho 0 tail 12 room 4
load:0x40080400,len:6352
entry 0x400806b8


Is there any way to avoid this happening?

Thanks

Re: How to eliminate serial header?

Posted: Sun May 17, 2020 9:10 pm
by ESP_Sprite
I think those are printed by the ROM... if so, making sure GPIO15 is low on boot (by using e.g. a pulldown resistor) should make it shut up.

Re: How to eliminate serial header?

Posted: Sun May 17, 2020 9:52 pm
by butchalline
Thank you Sprite!

That does indeed work.

Are there any other methods that might do the job?

Re: How to eliminate serial header?

Posted: Mon May 18, 2020 7:09 am
by ESP_Sprite
Not to suppress the output. In theory, another way to skin this (if you have complete control over your hardware) is not to use the default TxD/RxD pins and switch UART0 over to your custom pins as soon as you finished booting. Not 100% sure how you'd do that in the Arduino environment, though.

Re: How to eliminate serial header?

Posted: Mon May 18, 2020 2:29 pm
by butchalline
Thanks again Sprite for you helpful and rapid response !