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Enable AT command responses

PostPosted: Fri Nov 02, 2018 1:07 pm
by bremenpl
Hello there,
I am new to the ESP8266 ecosystem. I have hooked up a fast testing setup with an ESP-07s and an FT232 usb to uart bridge. I provided enough 3V3 power supply current. When I connected the device and check the uart log, I see garbage. Thanks to this post ( viewtopic.php?t=2298 ), I was finally able to figure out what is the baud parameters for that garbage and see the output (more or less):

Code: Select all ets Jan  8 2013,rst cause:2, boot mode:(3,0)

load 0x40100000, len 1856, room 16
tail 0
chksum 0x63
load 0x3ffe8000, len 776, room 8
tail 0
chksum 0x02
load 0x3ffe8310, len 552, room 8
tail 0
chksum 0x79
csum 0x79

2nd boot version : 1.5
  SPI Speed      : 40MHz
  SPI Mode       : DIO
  SPI Flash Size & Map: 32Mbit(512KB+512KB)
jump to run user1 @ 1000

rf cal sector: 1017
rf[112] : 00
rf[113] : 00
rf[114] : 01

SDK ver: 1.5.4.1(39cb9a32) compiled @ Jul  1 2016 20:04:35
phy ver: 972, pp ver: 10.1

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Interesting this is that right after this is printed out, the baud changes to 115200 (probably 8N1 no parity). The problem is that the device returns echo (so I see what I type) instead receiving an answer to my at commands. In the topic I linked, the author says that his device turned to 9600 baud after the garbage was spit (mines at 115200). I tried grounding GPIO15 but that did not help. The starting log says that I am in boot mode "(3,0)"- is that correct? I have only connected the power, uart lines and pulled up the EN line in my module. Should I provide more pull-ups or downs?

I would appreciate all help regarding this topic.

Re: Enable AT command responses

PostPosted: Fri Nov 02, 2018 3:56 pm
by rudy
Reset should also have a pull-up with the ESP-07, but that probably is not your problem. When you say you provide sufficient 3.3V power. What do you mean? Can you describe the power supply and how it is connected.

Re: Enable AT command responses

PostPosted: Fri Nov 02, 2018 4:16 pm
by bremenpl
Hi, thanks for answer. I meant that I added an 1A 3V3 LDO for powering the module. I dont think thats the case as well.

Re: Enable AT command responses

PostPosted: Fri Nov 02, 2018 8:02 pm
by rudy
Are your connections/wires from the LDO to the ESP short? I have seen people use breadboards and 20cm jumper wires connecting to a good power supply, and it not working because of that. LDO should be close and with some decent capacitance.