ESP8266 Developer Zone

ESP8266 HDK • ESP32-C5 with 802.11AC 5Ghz

2023-02-17T23:54:38+08:00

Has the ESP32-C5 been released with 5GHZ capability or is there another device in the ESPRESSIF family that has 5GHZ wifi capability.
Thank you

Statistics: Posted by jkoperwas — Fri Feb 17, 2023 11:54 pm

ESP8266 HDK • Re: UART

2022-10-25T22:25:16+08:00

I am afraid that a lot of necessary documentation will never be supplied by Espressif, including documentation of the UART.

Statistics: Posted by eriksl — Tue Oct 25, 2022 10:25 pm

ESP8266 HDK • Re: UART

2022-09-13T22:22:08+08:00

I have most of it working. What is your specific issue?

Statistics: Posted by eriksl — Tue Sep 13, 2022 10:22 pm

ESP8266 HDK • Re: Programs such as TCP connection will pause briefly

2021-12-17T10:25:45+08:00

I may not fully understand your question, I think maybe it will try to keep reconnecting til timeout, or maybe you can just disconnect the original connection and reconnect a new one.

Statistics: Posted by Her Mary — Fri Dec 17, 2021 10:25 am

ESP8266 HDK • Programs such as TCP connection will pause briefly

2021-12-03T14:52:59+08:00

How to handle when the program is running, the connection WiFi, TCP is disconnected or suspended from the connection for 3 or 4 seconds

Statistics: Posted by qq1411881729 — Fri Dec 03, 2021 2:52 pm

ESP8266 HDK • Documentation for ESP-LAUNCHER

2021-04-04T14:08:14+08:00

Hi,

I had purchased couple of ESP-LAUNCHER/DEV boards few years back. Recently I tried to download the documentation for ESP-LAUNCHER boards. I could find only schematic, pcb design and BoM.

Please tell me where to download the user guide for the development board.

Regards,

Venkat

Statistics: Posted by kaevee — Sun Apr 04, 2021 2:08 pm

ESP8266 HDK • ESP-WROOM-02 Firmware update to ESP8266 IDF AT Bin (Latest)

2021-02-27T15:56:07+08:00

Dear All,

I have some trouble with updating my firmware on my ESP-WROOM-02.
On my chip the Original firmawre => V1.6.2.0
I do an OTA firmware update and I get => V1.7.4
Now I try to Update to the last AT version and try to upload => ESP8266 IDF AT Bin (Latest)
I try with one binary download factory_WROOM-02.bin and also with several bin...
Download Update is seems OK...
Restart of cheap and I have defaut AP SSID (ESP_B9A4AC)
Test of AT command ... and Nothings
Reflashing ESP8266 NonOS AT Bin V1.7.4 firmware and the AT is OK...

What's wrong ? Is the ESP8266 IDF AT Bin is compatible with ESP-WROOM-02 ..?
Can somebody help me

Have a nice Day
Fredlynx

Statistics: Posted by fredlynx — Sat Feb 27, 2021 3:56 pm

ESP8266 HDK • Re: We really need a way to differenciate RESET and Wake Up from Deep Sleep

2020-02-28T11:53:12+08:00

Have you tried the latest RTOS SDK? It seems that it does not have this issue. https://github.com/espressif/ESP8266_RTOS_SDK

Statistics: Posted by Her Mary — Fri Feb 28, 2020 11:53 am

ESP8266 HDK • Re: We really need a way to differenciate RESET and Wake Up from Deep Sleep

2020-02-09T23:54:37+08:00

The ESP8266 has no internal hardware to distinguish (if deep sleep is enabled) whether a physical button press caused reset or a system wakeup caused a reset because they both do the same thing

That is not true.
The ESP8266 does have the internal hardware necessary to distinguish, and that is the RTC.
The RTC is running while in deepsleep. You put it into deepsleep for a given amount of time. When it wakes up, it could know, if it wanted to, how much time has elapsed since it went to sleep. All it needs to do is read the RTC before it resets it.

There is actually a low-level function whose name I can't remember, which gives you the elapsed time (can't remember if in micro or milliseconds) of the RTC since reset. Unfortunately, the SDK resets it first thing at startup (I saw it in the source code somewhere), so it always gives you the time since boot (which makes it exactly equivalent to another function that is supposed to be a different one - also cannot remember the name). So we, users, have no way to tell because the designers of the SDK decided to not allow us, not because the board doesn't have the internal hardware to allow it, which it does have.

This is a design flaw in the espressif SDK. And a huge one. Please fix it.

Statistics: Posted by Guest — Sun Feb 09, 2020 11:54 pm

ESP8266 HDK • Re: 硬件看门狗

2019-10-07T23:45:24+08:00

请问下大佬，硬件看门狗的话能重置时间吗，我用的是NONOS SDK，还是说只有软件看门狗才可以重置？

Statistics: Posted by Guest — Mon Oct 07, 2019 11:45 pm

ESP8266 HDK • Simplest reset sequencing circuitry

2019-09-24T05:03:06+08:00

Several designs (and admittedly my own) use the ESP8266/ESP8285 with only minimal reset circuitry, and sometimes hard-wiring CHIP_EN to VDD instead of following the sequencing outlined in the Espressif FAQ 1.4 and ESP8285 datasheet . Sometimes we use espressif parts where such sequencing is very difficult to fit/arrange. Can espressif comment on the minimal possible configuration for safely booting ESP8266's and ESP8285's? I.e. resistor between VCC and EXT_RSTB, capacitor on CHIP_EN, etc, since all I can find is just configurations that people out in the wild have preferred, as well as a specific instance on your WROOM where a 10k+0.1uF RC is used on CHIP_EN. We can also make some assumptions about the power-on time, i.e. <200 us.

This question is specific to situations where no deep-sleep is required.

Some specific questions arise out of this:

(1) What are minimum recommended resistor/capacitor combinations for EXT_RSTB and CHIP_EN?
(2) Can we tie EXT_RSTB to VDD if we properly sequence CHIP_EN?
(3) What is the internal pull-up/pull-down configuration of CHIP_EN?
(4) Is the reset circuitry and suggestions for ESP8266 and ESP8285 identical?
(5) Though non-ideal for high noise environments, can the EXT_RSTB pin be left floating if no trace is attached?
(6) If we connect CHIP_EN to GPIO16, is any other connection required?

Statistics: Posted by cnlohr — Tue Sep 24, 2019 5:03 am

ESP8266 HDK • Re: ESP8266 EFUSE Settings

2018-09-16T11:37:26+08:00

abhinavg wrote:
Hi grange,

Thanks for wounderful solution of the error. I have exactly same problem with my one of the ESP01 1M/Black version. I tried so may options bit nothing worked for me. I will try your solution.

In my case sometimes I am able to flash the firmware and sketch from arduino it works for the first time but when I rest/power off and on again, blue led again comes up. That is really frustrating situation.

I must know the different flash address for all 4 files in order to upload the firmware. You said that it is in the readme file but it is a link that navigates me to the lots of PDF documentation files. it is very difficult to find my answered from there.

If you can share what address you used in your case, it will be great help for me. I have ESP01 1M black version.

//Abhinav

wow, thanks for your post. I have exactly same problem with my ESP-12F too.
This is a good way to fix the efuse issue. I never used NodeMCU tools but it gives me a hint: Using another tool to flash a different firmware may fix the problem.
Here's what I did:
1. Open Arduino IDE for ESP8266
2. Choose ESP8266-Blink from the example files
3. Upload to ESP8266
4. Use ESP download tools to download new bins to the ESP8266.
The problem is fixed right away.

Thank you again.

Statistics: Posted by simonliu — Sun Sep 16, 2018 11:37 am

ESP8266 HDK • 迅准科技发布低功耗智能家居ESP8266 WiFi模块

2018-08-30T17:07:34+08:00

理想中的智能家居环境可能是这样的：智能手机可以控制家里的门窗、视频监控、智能插座、智能照明系统以及室温、环境监测等, 物联网WiFi模块在智能家居应用中占有一定优势。

物联网应用中无线连接技术是最关键的，目前已经有基于WiFi模块、蓝牙模块的物联网应用方案。那么问题来了，智能家居中的物联网WiFi模块选型有哪些注意点呢？

WiFi模块属于物联网传输层，IOT串口WiFi是基于Uart接口的符合wifi无线网络标准的嵌入式模块，内置无线网络协议IEEE802.11b.g.n协议栈以及TCP/IP协议栈，可将串口或TTL电平转为符合WiFi无线网络通信标准的嵌入式模块。

智能家居的一个重点便是联网，因此用于智能家居的无线系统需要满足几个特性：低功耗、稳定、易于扩展并网。WiFi模块是一种短程无线传输技术，能够在数百米范围内支持互联网接入的无线电信号。它的最大特点就是方便人们随时随地接入互联网。

WiFi技术在智能家居中的应用的主要优点有：

WiFi智能节点可以直接连接无线路由器，从而接入Internet网;不需要家庭网关，节点可以任意扩充;不会破坏现有装修;智能手机可以进行局域网控制和远程控制。

目前市场上出现多款物联网WiFi无线通信模块，其中IoT ESP8266 WiFi模块： PWF-ESP8266-501M和 FPWF-ESP8266-301M，可将用户的物理设备连接到WiFi无线网络上，进行互联网或是局域网通信，实现联网功能。一般可用作IoT WiFi模块, 智能家居WiFi模块, 智能语音WiFi模块，iftttWiFi模块, google assistantWiFi模块, 谷歌语音助手WiFi模块，亚马逊WiFi模块, 智能音箱WiFi模块, echo语音控制WiFi模块。

IOT WiFi模块：模块内部集成了射频收发、MAC、基带处理、WiFi协议和配置信息及网络协议栈，用户利用它可以轻松实现串口设备的无线网络功能，节省开发时间，使产品更快地投入市场，增强竞争力。

基于迅准科技IoT ESP8266 5V WiFi模块的智能家居解决方案：

PWF-ESP8266-501M是一款基于ESP8266的低成本、高集成度的串口WiFi模块，支持IEEE802.11b/g/n 1T1R完整的 TCP/IP 协议栈。用户可以使用该模块为现有的设备添加联网功能，也可以构建独立的网络控制器。

Statistics: Posted by jessicatian123 — Thu Aug 30, 2018 5:07 pm

ESP8266 HDK • Pin definition for esp-wroom-s2 is confusing

2018-08-15T17:20:08+08:00

Pin3 and Pin20 definition in Schematic and Peripheral schematic is conflict.
esp-wroom-s2 schematic：

esp-wroom-s2 Peripheral schematic：

Statistics: Posted by qinyan — Wed Aug 15, 2018 5:20 pm

ESP8266 HDK • 迅准科技物联网WiFi模块, 提供专业智能音箱解决方案

2018-08-02T16:42:28+08:00

作为物联网IoT的超级入口, 智能音箱堪称物联网皇冠。据市场调查机构Canalyst表示, 2018年全球智能音箱装置量将达1亿台, 2020年装置量更可能达到2.25亿台。而在智能音箱主要平台方面，亚马逊Alexa与Google Assistant两大阵营的对战，从今年Google Home出货量超过亚马逊Echo起，便开始白热化并将持续延续下去。

无线音频传输经历了FM、红外线及蓝牙等几种方式的革新, WiFi无线智能音箱的出现, 带来了无线音频传输技术的革新, 重塑以“音乐”为中心的产业链各环节的商业模式。

从技术上来看, 跟以往FM、红外线及蓝牙等无线音频传输相比, WiFi传输有非常突出的优势, 比如能胜任家庭的传输距离, 传输带宽高达百兆级, 轻松实现发烧级无损音频传输, 跳频技术让它拥有较强的抗干扰能力, 功耗低, 适合家庭及户外供电工作等。

不同的内容对应不同的场景。智能音箱走进家庭的使用场景是非常丰富多样，除了天气播报、讲故事、听音乐等智能音箱都具备的功能外，教育孩子使用的将故事、学习功能，购物，工作应急等必不可少。

WiFi智能音箱应用：以迅准科技智能低频方案为例, 基于ESP8266, ESP32 WiFi模块的研发, 给音箱行业带来了一套功能更全、体验更佳的Wi-Fi音箱终端解决方案。

物联网IoT应用模块举例：ESP8266 5V WiFi模块，ESP8266 3V WiFi模块, ESP32 5V WiFi模块, ESP32 3V WiFi模块

WiFi音箱通过IoT WIFI模块，利用无线路由器，使其接入到外部网络当中，然后通过手机、平板等设备连接音箱，通过Air Play、DLNA和Q Play等多媒体的协议将音乐推送到音箱当中进行播放，传输能力强、可连接多个设备、播放音源多样等。

迅准科技IoT WiFi模块可用作智能家居WiFi模块, 智能语音WiFi模块，ifttt WiFi模块, google assistant WiFi模块, 谷歌语音助手WiFi模块，亚马逊WiFi模块, 智能音箱WiFi模块, echo语音控制WiFi模块。

Statistics: Posted by jessicatian123 — Thu Aug 02, 2018 4:42 pm

ESP8266 HDK • Cannot flash nodemcu after enabling internal pull up resistors on pin 2,3,4..,7

2018-07-10T01:20:29+08:00

After I set up pins 2,3,4,5,6,7 as INPUT_PULLUP my serial monitor went crazy and I'm not able to flash my board, I'm aware that D3, D4 are important for flashing, but I accidentally did it, is there any way to pull down those internal pull up, or reset/reflash my board.

Statistics: Posted by ABC_anon — Tue Jul 10, 2018 1:20 am

ESP8266 HDK • Re: Flash size

2018-07-09T20:52:17+08:00

ESP-WROOM-02 is a low-power 32-bit MCU Wi-Fi module, based on the ESP8266 chip. TCP/IP network stacks, 10-bit ADC, and HSPI/UART/PWM/I2C/I2S interfaces are all embedded in this module.
ESP-WROOM-S2 uses a 2 MB SPI flash connected to HSPI, working as SDIO/SPI slave, with the SPI speed being up to 8 Mbps.

Statistics: Posted by inlogic — Mon Jul 09, 2018 8:52 pm

ESP8266 HDK • Flash size

2018-06-27T16:47:19+08:00

Hi !

Got a batch of ESP-WROOM-02 modules through production that we thought were 2MB.

Reel markings are:

Code:

Product Name: ESP-WROOM-02
Manufacturer PN: 04.09.0000740
Supplier PN: M021X0132R0E
LOT No.: 201812-066
Manufacture Date: 2018-03-21

However, esptool.py flash_id command reports the flash as 4MB, C8/4016.

Some comments about interpreting the flash_id here: https://www.esp8266.com/viewtopic.php?p=31787

The supplier ID includes "32" which might signify the flash size?

Can anyone categorically confirm the flash size in these modules, according to the manufacturer or supplier PN?
And if these are 4MB, then is that temporary (as I thought all modules were 2MB nowadays?).
And what PN would be expected on the reel packaging, when the modules do contain 2MB chips... M021X0116R0E perhaps?

Any help really appreciated!

Statistics: Posted by mikeatom — Wed Jun 27, 2018 4:47 pm

ESP8266 HDK • esp-prog programming problem

2018-06-21T20:59:30+08:00

connection are:

esp-prog / esp-01

TX / rx
RX / tx
I00 / i00
EN / RST (tryed also on CH_PD)
GND / GND
usb conn. / +V (external source)
-- / CH-PD with pullup 10k
-- / i02 to pullup 10k

the blue light flash when i start to program

i try with these programs: esp8266flasher, inside visual studio (with visualmicro),ESPFlashDownloadTool_v3.6.4

when the green light flash, also on the esp01 flash the blue light

noone of this can program, what is the trick?

thanks

Statistics: Posted by fastlink30 — Thu Jun 21, 2018 8:59 pm

ESP8266 HDK • Custom board Cant flash

2018-06-20T05:41:16+08:00

Hi,

Im using the Windows CE BSP for the AT91SAM9263-EK on a custom board. This board allows the NAND flash and UART2 to be used.

My question is how can I enable UART2 NAND flash is used in my OS design?

Thanks for your time.
- raygloria

Statistics: Posted by andreysnug — Wed Jun 20, 2018 5:41 am

ESP8266 HDK • Pull up resistors

2018-06-07T14:25:29+08:00

By looking at the EB40A schematics, I find pull-up resistor on data bus. Is there a reason ?
I do not find the value of these resistors.

Statistics: Posted by andreysnug — Thu Jun 07, 2018 2:25 pm

ESP8266 HDK • ESP-12F Power supply issues only when using AT Firmware??

2018-06-02T18:13:01+08:00

Hi all,

I designed a custom PCB for a ESP-12 module. However I think I am facing some PSU issues.

the PSU is 5V and The PCB has a LF33 (and external components)

After booting, the ESP states: "ready" then "Wifi disconnect"

The point is, If I add capacitors to the 3.3V lane, the behaviour is more stable. But it varies between each ESP-12 module. And also what I noticed: This unstable behaviour is only observed when using the AT firmware.

I was able to reporduce the behaviour using a Wemos D1 Mini board. It works stable, using the delivered firmware, however when flashing the latest AT firmware to the device, it behaves unstable (increasing ping times, sometimes no connection) - When adding a capacitor to the 3.3V of the wemos board, it is stable again.

Is the AT firmware transient load higher? If yes, why? and is there a configuration parameter, that I can decrease peak power consumption?

Also, is the ESP32 more stable than that? Are there any modules that include a 5V to 3.3V line converter that handles the AT firmware?

Statistics: Posted by sebastian.heyn — Sat Jun 02, 2018 6:13 pm

ESP8266 HDK • ESP12 stuck in boot mode

2018-05-30T06:28:09+08:00

Help. I got myself stuck booting into Boot Manager with the ivp6 and ivp4 choices. How do I get back to the main UBCD menu?
Thank you.

Statistics: Posted by andreysnug — Wed May 30, 2018 6:28 am

ESP8266 HDK • Re: ESP8266 GPIO的内部上拉/下拉电阻有多大？ What is the value in ohms of ESP8266 GPIO Pullup/Pulldowns？

2018-05-10T10:20:22+08:00

GPIO 上下拉等效电阻范围应该是 30k~100k 欧。

Statistics: Posted by Her Mary — Thu May 10, 2018 10:20 am

ESP8266 HDK • ESP8266 用一节纽扣电池CR2032可以用20天？

2018-05-06T21:01:41+08:00

esp8266 5分钟上传一次数据然后进入deep-sleep 模式

上传的平均电流100mA 上传时间定为1 S

CR2032定为 200mAh = 720000 mAs

deep-sleep模式功耗不计算，理论能使用的次数为7200次

5分钟上传一次一天要传288次，一共能传7200/288=25天留些余量定为20天

请问各位我这个算法对不对？

Statistics: Posted by iot_develpment — Sun May 06, 2018 9:01 pm

ESP8266 HDK • ESP8266 GPIO的内部上拉/下拉电阻有多大？ What is the value in ohms of ESP8266 GPIO Pullup/Pulldowns？

2018-04-27T10:40:13+08:00

乐鑫你好！

ESP8266 GPIO的内部上拉/下拉电阻范围有多大？

谢谢！

Hello Espressif,

What is the value in ohms of ESP8266 GPIO Pullup/Pulldowns？

Thanks,

Statistics: Posted by Guest — Fri Apr 27, 2018 10:40 am

ESP8266 HDK • ESP8266 and EMC testing

2018-04-09T20:18:59+08:00

I need to send the ESP8266 module for EMC tests.

I must fill in the form at: http://www.etsi.org/deliver/etsi_en/300 ... 20200a.pdf
(pages 97-103) but there is too much detail I can't find.

Where can I find such data? Please help me.

Kris

Statistics: Posted by kris_gor — Mon Apr 09, 2018 8:18 pm

ESP8266 HDK • Re: Is there a serial number or unique ID in the chip

2018-04-07T07:07:41+08:00

I've had 100+ esp modules on my lab desk and none had a chip id > 0x00FFFFFF, i.e. only 24 bits (3 bytes from the default mac address). For that reason I use (as unique id) the default mac address instead.

Statistics: Posted by blubb — Sat Apr 07, 2018 7:07 am

ESP8266 HDK • Re: ESP8266 EFUSE Settings

2018-03-27T15:24:59+08:00

Hi grange,

Thanks for wounderful solution of the error. I have exactly same problem with my one of the ESP01 1M/Black version. I tried so may options bit nothing worked for me. I will try your solution.

In my case sometimes I am able to flash the firmware and sketch from arduino it works for the first time but when I rest/power off and on again, blue led again comes up. That is really frustrating situation.

I must know the different flash address for all 4 files in order to upload the firmware. You said that it is in the readme file but it is a link that navigates me to the lots of PDF documentation files. it is very difficult to find my answered from there.

If you can share what address you used in your case, it will be great help for me. I have ESP01 1M black version.

//Abhinav

Statistics: Posted by abhinavg — Tue Mar 27, 2018 3:24 pm

ESP8266 HDK • Re: Is there a serial number or unique ID in the chip

2018-03-26T10:39:21+08:00

The Chip ID is 32 bit. Check the return value of system_get_chip_id() function.
Hence, around 4.3 billion different Chip IDs.
And with Espressif claiming to have shipped 100 million chips as of January 2018, I believe the chip ID is unique so far.

Statistics: Posted by jassi007 — Mon Mar 26, 2018 10:39 am

ESP8266 HDK • Re: Is there a serial number or unique ID in the chip

2018-03-26T10:33:33+08:00

blubb wrote:
Chip id is only 24 bit, so if more than 16.8 million chips have been manufactured, it cannot be unique.

The Chip ID is 32 bit. Check the return value of system_get_chip_id() function.

Statistics: Posted by jassi007 — Mon Mar 26, 2018 10:33 am

ESP8266 HDK • FCC problem in EMC 55014

2018-03-13T11:40:31+08:00

Hi all, we are using ESP-12F from AI-thinker for our application and we are using ESP8266 to control whole appliance application included LCD display and we found 12F have not enough GPIO for our application so we used the SPi port to share the LCD control. The product development is fine in application till now but we have suffered the EMC test failure (EM55014) and 40MHz clock for the internal flash in 12F module is leakage to make EM55014 failure and we try to add a filter in external SPI line and it is improved a bit but not enough to make EMC test passed. Do you have any suggestion in hardware or software in order to get help on it. In addition, AI-thinker said that SPI port is not recommended for other application (only for internal flash usage only). is it right for the ESP8266 application?

Statistics: Posted by HungLI — Tue Mar 13, 2018 11:40 am

ESP8266 HDK • Re: ESP8266干扰arduino的ADC问题

2018-03-08T20:52:00+08:00

看你这状况应该是电流不足,额外接一条电源试试

Statistics: Posted by BlackHole — Thu Mar 08, 2018 8:52 pm

ESP8266 HDK • Re: espressif download tool got chip efuse check error

2018-02-26T22:17:42+08:00

The flash I used on board is W25Q64JVSSIQ, 64Mbit SPI flash from Winbond.
And the SDK is ESP8266_NONOS_SDK_V2.0.0_16_08_10.
I was able to read the mac of the chip in Linux system with command of

Code:

sudo esptool.py read_mac

, which indicated the normal function of the uart interface.
The wired thing is when I changed the size of flash to 2MB of command

Code:

esptool.py write_flash

, the chip managed to boot up, while 4MB or 8MB failed.
The command line I used is

Code:

sudo esptool.py --port /dev/ttyUSB0 write_flash -fm qio -fs [size=150]2MB[/size] 0  ../bin/boot_v1.6.bin 0x1000 ../bin/upgrade/user1.4096.new.6.bin  0x1fb000 ../bin/blank.bin 0x1fc000 ../bin/esp_init_data_default.bin 0x1fe000 ../bin/blank.bin

.
Can anyone help me out please? Many thanks.

Statistics: Posted by ansonc — Mon Feb 26, 2018 10:17 pm

ESP8266 HDK • espressif download tool got chip efuse check error

2018-02-24T11:44:47+08:00

hi, I have a EVB designed on reference of ESP-WROOM-02 with CH340 as usb2serial interface. I tried to download image with esptool.py in linux, the downloading was success but failed to boot. I used espressif download tool in Windows system, and got efuse check error as the following.

What could it be possibly wrong? Please take a look. Many thanks.

Statistics: Posted by ansonc — Sat Feb 24, 2018 11:44 am

ESP8266 HDK • Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

2018-01-22T16:50:17+08:00

PROBLEM SOLVED !!!!

Check this link: https://github.com/espressif/ESP8266_NO ... /issues/85

Statistics: Posted by DreeOlee — Mon Jan 22, 2018 4:50 pm

ESP8266 HDK • Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

2018-01-16T05:57:43+08:00

I did a full flash erase, after that, the problem was gone.

So I think the problem is in the API (not accessible software for me) Only if my perspective is well approached, of course.

For my understanding, is this the correct architecture?

---------------
User application
---------------
SDK
---------------
API
---------------
physical layer
---------------

If this is the architecture, than I think the problem is in the API compiled bin files.

Is there someone who can help me with this?

Statistics: Posted by DreeOlee — Tue Jan 16, 2018 5:57 am

ESP8266 HDK • Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

2018-01-16T00:24:00+08:00

Just flashed the latest esp_init_data_default.bin but without success.

Is there anyone who can reproduce this problem ?

Statistics: Posted by DreeOlee — Tue Jan 16, 2018 12:24 am

ESP8266 HDK • Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

2018-01-13T08:51:16+08:00

Maybe one more idea:
Did you flash the latest esp_init_data_default.bin?
Recently they changed something, so there is a new version "8":
https://github.com/espressif/ESP8266_NO ... master/bin

Statistics: Posted by blubb — Sat Jan 13, 2018 8:51 am

ESP8266 HDK • Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

2018-01-12T23:08:09+08:00

okay thank.....I will place it directly.

Statistics: Posted by DreeOlee — Fri Jan 12, 2018 11:08 pm

ESP8266 HDK • Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

2018-01-12T22:52:11+08:00

I recommend opening an issue on github
https://github.com/espressif/ESP8266_NONOS_SDK/issues

Edit:
There are several APIs like
system_phy_set_powerup_option(...);
system_phy_freq_trace_enable(...);
But if the problem occurs before user_rf_pre_init this is a case for a github issue for sure.

Statistics: Posted by blubb — Fri Jan 12, 2018 10:52 pm

ESP8266 HDK • Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

2018-01-12T22:47:02+08:00

In the user_init. Tried also in the user_rf_pre_init without result.

The problem occurs before the user_rf_pre_init. I commented everything out in the user_rf_pre_init, user_init and the init_done. Strange btw is that after this, I got more debug info on my serial line

Code:

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

load 0x4010f000, len 1384, room 16 
tail 8
chksum 0x2d
csum 0x2d
v00000000
~ld
rf cal sector: 508
freq trace enable 0
rf[112] : 00
rf[113] : 00
rf[114] : 00

SDK ver: 2.1.0(deb1901) compiled @ Oct 23 2017 17:58:03
phy ver: 1136_0, pp ver: 10.2

mode : null

I still have the problem.

Statistics: Posted by DreeOlee — Fri Jan 12, 2018 10:47 pm

ESP8266 HDK • Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

2018-01-12T18:08:59+08:00

Do you call this API in user_rf_pre_init or in user_init? I wonder if that makes a difference.

Statistics: Posted by blubb — Fri Jan 12, 2018 6:08 pm

ESP8266 HDK • Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

2018-01-12T17:12:54+08:00

Yes I also tried that. In fact, that was our original problem. We made a change in the API and now we had full control over the ESP. But still the problem appears with switching the device on.

It happens only at startup. Just a fraction of time, after that there is no problem. The time is that short, that the spectrum analyzer not always captures the signal.

Statistics: Posted by DreeOlee — Fri Jan 12, 2018 5:12 pm

ESP8266 HDK • Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

2018-01-12T07:13:06+08:00

Have you tried the API mentioned here?
viewtopic.php?f=7&t=8768

Statistics: Posted by blubb — Fri Jan 12, 2018 7:13 am

ESP8266 HDK • Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

2018-01-11T20:32:50+08:00

I just downloaded the ESP8266_FCC_26m_20170731.bin file, and the result is exactly the same. Directly at power-up and just ones.

Statistics: Posted by DreeOlee — Thu Jan 11, 2018 8:32 pm

ESP8266 HDK • Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

2018-01-11T18:02:37+08:00

Espressif provided an FCC firmware on their website http://www.espressif.com/en/support/download/other-tools.
You can download and test the "ESP8266 Certification and Test".

Statistics: Posted by Her Mary — Thu Jan 11, 2018 6:02 pm

ESP8266 HDK • FCC problem - Spectrum analyzer shows unwanted transmission when startup

2018-01-10T21:31:48+08:00

Hello everyone,

This is my first post at this Forum. Hopefully someone can help/support me with this urgent issue.

The problem is that the module shows a lot of unwanted transmissions during start-up, causing the FCC certification to fail.

As the attachment shows, the transmissions are unexpected and not inside the FCC regulations. According the FCC, transmissions outside the blue lines are not allowed.

> I'm using the ESP-WROOM-02 module.
> Latest SDK (also tried previous versions)
> Even deleted every WiFi SDK link, without success
> Try starting up with WiFi disabled, no success
> Tried different power supplies, no success
> The phenomenon is also visible during a restart from deep sleep
> After restart, so from the first line of the initialization/setup(), I have full control without issues.

At this moment I'm out of ideas how to solve this problem. I expect it's a ESP hardware issue, but not sure.

Is there anyone who can help me with this or is there anyone who have seen this problem before?

Greetings,
DreeOlee

Statistics: Posted by DreeOlee — Wed Jan 10, 2018 9:31 pm

ESP8266 HDK • ESP Download Tool does not detect ESP LAUNCHER

2017-11-27T18:52:12+08:00

Dear Sirs and Madams!

I've purchased ESP Launcher and according to the docs it has two (and a half) serial ports:
1) One integrated with USB power supply
2) Second one on pin header
3) The half of third one (only TX) also on pin header

Which UART do I have to connect to for ESP Download Tool can detect it and can upload firmware to it?

Statistics: Posted by KernelPanic — Mon Nov 27, 2017 6:52 pm

ESP8266 HDK • Sming fileSetContens sometimes resets ESP-WROOM-02

2017-11-09T12:50:34+08:00

I app I am working on, I am trying to save WiFi credentials on SPI Filesystem with following method:

Code:

void ApplicationSettingsStorage::saveFunction(void *arguments)
{
    Serial.println("Saving settings...");

    const String json=getJson(false,
                              true); // Passwords are saved, timestamps are updated on every save.

    Serial.println(json);

    /*
     * Excluded reasons for bug:
     *     - NON-NULL Terminated String: I've explicitliy added "\0" to json variable before saving it to file,
     *                                   same result, random reset
     *     - Memory corruption:

    fileSetContent(APP_SETTINGS_FILE,
                   json);   // BUG: Here occurs random reset !!!
}   // saveFunction

Now, calling fileSetContent forces whole ESP-WROOM-02 SOMETIMES TO RESET on random occasions. Why?

Statistics: Posted by KernelPanic — Thu Nov 09, 2017 12:50 pm