Page 1 of 2
Connecting ESP12 for normal function or programming modes
Posted:
Fri Jan 29, 2021 4:17 pmby sairfan06
I'm quite confused on ESP pin connections for programming or normal run mode, though this question is widely asked on the internet but wanted to be sure.
I'm designing a PCB where I want ESP run in normal mode, but I can connect through header to program ESP please refer to images.
Please look at my schematic U10 is programming header, I will connect it to ESP-01 header (please refer to image)
Re: Connecting ESP12 for normal function or programming mode
Posted:
Mon Feb 01, 2021 1:17 amby JurajA
to enter bootloader mode io 0 must be LOW at reset. that is all.
io 0, 2 and 15 are boot configuration pins. the modes configured by 2 and 15 are used with uncommon configurations. for esp8266 with application in external flash io 2 must be HIGH at boor and io 15 must be LOW at boot. the pull down resistor on io 15 is missing in your schematics
Re: Connecting ESP12 for normal function or programming mode
Posted:
Mon Feb 01, 2021 10:35 amby sairfan06
I'm using ESP12E and i believe i have to pull up GPIO 2 and pull down GPIO 15, is that right?
if you pull down GPIO15 with 10k resistor for boot, then in the program (after boot) can i send signal with state HIGH
Re: Connecting ESP12 for normal function or programming mode
Posted:
Tue Feb 02, 2021 1:44 amby JurajA
sairfan06 wrote:I'm using ESP12E and i believe i have to pull up GPIO 2 and pull down GPIO 15, is that right?
if you pull down GPIO15 with 10k resistor for boot, then in the program (after boot) can i send signal with state HIGH
yes and yes.
don't use io 15 as CS for SPI slave if you connect one