Using Arduino UNO to flash firmware on ESP-01

DryRun · December 27, 2019, 7:23pm

Hello,

I was originally trying to change the baud rate of my ESP-01 permanently from its default 115200 to 9600. In Arduino IDE Serial Monitor, i typed AT and got a response OK.
I tried AT+UART_DEF=9600,8,1,0,0 and AT+UART=9600,8,1,0,0 and got error in both cases.
I then typed AT+IPR=9600 and did not get any response. But after that, no AT commands are working.

I figured that the only option is to flash the official Espressif firmware and then try again to change the baud rate. This is the guide that i have followed: How to Update Flash ESP8266 Firmware - Flashing Official AT Firmware Electronics Hub

I get red boxes instead of the green boxes with hex codes:

I reset the ESP-01 again while reading the Serial Monitor and i got the following text only at baud rate of 74880, which is odd to say the least:

ets Jan  8 2013,rst cause:2, boot mode:(1,6)

Juraj · December 27, 2019, 7:33pm

did you fill in the addresses?
the AT 1.7 is for 2 MB flash, but the second megabyte is used only for OTA upload
select 16 Mbit-C1

0x0 boot_v1.7.bin
0x01000 at/1024+1024/user1.2048.new.5.bin
0x1fb000 blank.bin
0x1fc000 esp_init_data_default_v08.bin
0xfe000 blank.bin
0x1fe000 blank.bin

DryRun · December 27, 2019, 7:50pm

I'm using the ESP8266 AT Bin V1.5.1: https://www.espressif.com/sites/default/files/ap/esp8266_at_bin_v1.5.1.zip and the latest Flash Download Tools (ESP8266 & ESP32) V3.6.8
From the ESP8266EX Resources page, i guess i could use the latest AT firmware (ESP8266 NonOS AT Bin V1.7.1) but i don't want to risk it for now since the guide linked in my first post above uses AT firmware 1.5.1.

Anyway, the flashing seems like it went through:

Afterwards, in Arduino Serial Monitor, i reset the ESP and this is what i see:

ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x40100000, len 2592, room 16 
tail 0
chksum 0xf3
load 0x3ffe8000, len 764, room 8 
tail 4
chksum 0x92
load 0x3ffe82fc, len 676, room 4 
tail 0
chksum 0x22
csum 0x22

2nd boot version : 1.7(5d6f877)
SPI Speed : 40MHz
SPI Mode : QIO
SPI Flash Size & Map: 16Mbit(512KB+512KB)
jump to run user1 @ 1000

rf cal sector: 507
freq trace enable 1
rf[112] : 03
rf[113] : 00
rf[114] : 01

SDK ver: 2.1.0(ace2d95) compiled @ Oct 24 2017 12:04:16
phy ver: 1134_0, pp ver: 10.2

I typed AT and no response.

Edit: I fixed my mistake. Under 'FLASH SIZE', i had selected 16Mbit instead of 16Mbit-C1. I also used the newer AT firmware 1.6.2.
Here is the output from Serial Monitor after resetting the ESP-01:

ready
AT

OK
AT+GMR
AT version:1.6.2.0(Apr 13 2018 11:10:59)
SDK version:2.2.1(6ab97e9)
compile time:Jun  7 2018 19:34:29
Bin version(Wroom 02):1.6.2
OK

Juraj · December 27, 2019, 8:29pm

the detected flash size is 4Mbit. use addresses for 4 Mbit

0x00000
0x10000
blank.bin 0x78000
esp_init_data_default.bin 0x7C000
blank.bin 0x7A000
blank.bin 0x7E000

ieee488 · December 27, 2019, 8:34pm

Do you mean?

0x000000     boot_v1.7.bin
0x010000     at/1024+1024/user1.2048.new.5.bin
0x1fb000     blank.bin
0x1fc000     esp_init_data_default_v08.bin
0xfe0000     blank.bin
0x1fe000     blank.bin

DryRun · December 27, 2019, 8:39pm

Juraj:
the detected flash size is 4Mbit. use addresses for 4 Mbit

0x00000
0x10000
blank.bin 0x78000
esp_init_data_default.bin 0x7C000
blank.bin 0x7A000
blank.bin 0x7E000

I suppose you came to this conclusion from this error line?

SPI Flash Size & Map: 16Mbit(512KB+512KB)

I am still unsure about the following:

The flash size for my ESP-01 model is 0.5 MB or 4 Mbit? Am i correct?
But in the flash tool settings, i already chose 16Mbit-C1 and it seems to be working. Will this cause any issues in my ESP programming or usage of the ESP-01 eventually? I plan to use it with the Arduino UNO to add Wi-Fi functionality to the latter.
Why have you given hex codes for 3 blank.bin files? There is only one blank.bin file in the AT firmware download folder and the hex code i used for it is: 0xFE000

ieee488 · December 27, 2019, 8:41pm

juraj is the expert.

I have several ESP-01 and I followed the tutorial : https://www.allaboutcircuits.com/projects/flashing-the-ESP-01-firmware-to-SDK-v2.0.0-is-easier-now/ . It seemed to work fine.

.

DryRun · December 27, 2019, 8:56pm

So, i re-flashed the ESP-01 as per the most recent suggestion and this time i used the very latest ESP8266 NonOS AT Bin V1.7.1:

I reset the ESP and got the following on Serial Monitor only at baud rate 74880:

ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x40100000, len 2592, room 16 
tail 0
chksum 0xf3
load 0x3ffe8000, len 764, room 8 
tail 4
chksum 0x92
load 0x3ffe82fc, len 676, room 4 
tail 0
chksum 0x22
csum 0x22

2nd boot version : 1.7(5d6f877)
SPI Speed : 40MHz
SPI Mode : QIO
SPI Flash Size & Map: 4Mbit(256KB+256KB)
jump to run user1 @ 1000

mismatch map 5,spi_size_map 0
system param partition error
--- The partition table size is larger than flash size 0x80000 ---
please check partition type 6 addr:1fd000 len:3000
system_partition_table_regist fail

I re-flashed with a flash size of 8Mbit, reset and got the following:

ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x40100000, len 2592, room 16 
tail 0
chksum 0xf3
load 0x3ffe8000, len 764, room 8 
tail 4
chksum 0x92
load 0x3ffe82fc, len 676, room 4 
tail 0
chksum 0x22
csum 0x22

2nd boot version : 1.7(5d6f877)
SPI Speed : 40MHz
SPI Mode : QIO
SPI Flash Size & Map: 8Mbit(512KB+512KB)
jump to run user1 @ 1000

mismatch map 5,spi_size_map 2
system param partition error
--- The partition table size is larger than flash size 0x100000 ---
please check partition type 6 addr:1fd000 len:3000
system_partition_table_regist fail

Re-flashing with 16Mbit setting and reading from Serial Monitor at baud rate of 74880:

 ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x40100000, len 2592, room 16 
tail 0
chksum 0xf3
load 0x3ffe8000, len 764, room 8 
tail 4
chksum 0x92
load 0x3ffe82fc, len 676, room 4 
tail 0
chksum 0x22
csum 0x22

2nd boot version : 1.7(5d6f877)
SPI Speed : 40MHz
SPI Mode : QIO
SPI Flash Size & Map: 16Mbit(512KB+512KB)
jump to run user1 @ 1000

mismatch map 5,spi_size_map 3
system_partition_table_regist fail

Re-flashing with 16Mbit-C1 at reading from Serial Monitor at correct baud rate of 115200:

AT

OK
AT+GMR
AT version:1.7.1.0(Jul 15 2019 16:58:04)
SDK version:3.0.1(78a3e33)
compile time:Jul 15 2019 18:12:41
Bin version(Wroom 02):1.7.1
OK

ieee488 · December 27, 2019, 9:05pm

I think you need the 512+512 bin file.

DryRun · December 27, 2019, 9:18pm

So, these settings worked for my ESP-01. I hope it helps others.

And the latest AT commands work great!

AT

OK
AT+UART_DEF=9600,8,1,0,0

OK

Juraj · December 28, 2019, 8:03am

so I can't imagine how 1.7.x can work on 512 kB (4Mb) flash.
some reading and links

github.com

jandrassy/WiFiEspAT/blob/master/README.md#at-firmware-versions


# WiFiEspAT library

This library creates standard Arduino WiFi networking API over ESP8266 or ESP32 AT commands. The Arduino WiFi networking API was established by Arduino WiFi library and enhanced by Arduino WiFi101 and Arduino WiFiNINA library.

This library is fast and reliable. It can communicate with AT firmware at high baud rates without flow control, limited only by reliability of UART at chosen speed.

The library is for all Arduino MCU architectures.

![MKR Zero with esp-01S](mkrzero-esp-01s.jpg)

## Contents

* [Getting started](#getting-started)
* [Why a new WiFiEsp library?](#Why-a-new-wifiesp-library)
* [Limitations](#limitations)
* [AT firmware versions](#at-firmware-versions)
* [Wiring of ESP module](#wiring-of-esp-module)
* [Baud rate for communication with AT firmware](#baud-rate-for-communication-with-AT-firmware)
* [Persistent WiFi connection](#persistent-wifi-connection)

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Using Arduino UNO to flash firmware on ESP-01

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