Search found 140 matches

by Espressif_Kelly
Tue May 10, 2016 11:25 am
Forum: ESP8266 HDK
Topic: ESP8266 IoT Ref Compatible Board
Replies: 14
Views: 8111

Re: ESP8266 IoT Ref Compatible Board

Hi, When you short up two lines of this connector, it means this GPIO will be pulled down to ground. When you short bottom two lines of this connector, it means this GPIO will be pulled up to vdd. Current settings in your board is flash boot mode. MTDO->low GPIO0->high GPIO2->high If you need to get...
by Espressif_Kelly
Mon May 09, 2016 5:12 pm
Forum: ESP8266 HDK
Topic: 关于将 uart0 的 txd 和 rxd 交换到其他引脚
Replies: 6
Views: 7411

Re: 关于将 uart0 的 txd 和 rxd 交换到其他引脚

您好!

出现非零数据的板子多吗?复现几率大吗?

贵司测试使用的 SDK 版本是多少?

目前贵司是通过上电隔离的办法进行解决的,所以需要查下为何会出现 1100 0011 这个情况。请帮忙提供测试电路的原理图以供查证。

谢谢!
by Espressif_Kelly
Mon May 09, 2016 4:31 pm
Forum: ESP8266 HDK
Topic: ESP8266 IoT Ref Compatible Board
Replies: 14
Views: 8111

Re: ESP8266 IoT Ref Compatible Board

Hi, Sorry, ESP8266 IOT Ref Compatible board has already been replaced by ESP-LAUNCHER. Below is the descriptions of ESP8266 IOT Ref Compatible board which you can refer to. 20160509.jpg 1、External power supply: 5V, 1A, positive in, negative out. 2、External 5V power supply split through 3 LDO for ESP...
by Espressif_Kelly
Fri May 06, 2016 2:37 pm
Forum: ESP8266 HDK
Topic: EN pulse output at 10Hz
Replies: 3
Views: 3513

Re: EN pulse output at 10Hz

Hi,

Please help confirm if it is due to the variation of power supply. Because ESP8266EX will send beacon every 100ms in softAP mode.

More questions, please let us know.

Thanks.
by Espressif_Kelly
Fri May 06, 2016 2:27 pm
Forum: General Q&A
Topic: WROOM-02 Resetting[Done]
Replies: 5
Views: 4009

Re: WROOM-02 Resetting

Hi Javier, For EXT_RSTB, in order to avoid reset caused by external interference, the trace of EST_RSTB is generally required to be short, and external RC circuit is recommended and should be placed close to EXT_RSTB pin. Besides, for relay application and so on, AC Ground and DC Ground should be se...
by Espressif_Kelly
Wed May 04, 2016 6:00 pm
Forum: ESP8266 HDK
Topic: HSPI Flash possible?
Replies: 3
Views: 11409

Re: HSPI Flash possible?

Hi,

You can get sdio_slv.c in our SDK which can be obtained in the below links.

viewtopic.php?f=46&t=850

More questions, please feel free to let us know.

Thanks.
by Espressif_Kelly
Wed May 04, 2016 5:53 pm
Forum: ESP8266 SDK
Topic: 怎么样让ESP8266一直通过wifi发送数据,来做天线匹配?
Replies: 1
Views: 3872

Re: 怎么样让ESP8266一直通过wifi发送数据,来做天线匹配?

您好!

从 ESP8266EX Pin2 RF 端往天线端看进去,阻抗与 ESP8266EX 源端的阻抗保持一致,RF 性能最好。

一般匹配天线是使用网络分析仪通过查看 smith 圆图进行的。

之后可将待测模块通过天线辐射的方式连接至 IQview (矢量信号分析仪), 确认 TX RX 性能是否满足指标要求,最后确认天线的匹配参数值。

我司可提供定频测试软件,可在以下链接中获取。

viewtopic.php?f=57&t=1341

如有问题,请告知。

谢谢!
by Espressif_Kelly
Fri Apr 29, 2016 3:41 pm
Forum: ESP8266 HDK
Topic: Cannot download through Flash Download Tools[Done]
Replies: 12
Views: 20640

Re: Cannot download through Flash Download Tools

Hi, When you want to download firmware into spi flash using flash download tool, please make sure that GPIO15 is low, GPIO0 is low and GPIO2 is high. And you get below print through UART. ets Jan 8 2013,rst cause:2, boot mode:(1,6) After download, GPIO0 should be switched to high and ESP8266EX will ...
by Espressif_Kelly
Fri Apr 29, 2016 3:33 pm
Forum: ESP8266 HDK
Topic: GPIO2 behavior on bootup
Replies: 2
Views: 2464

Re: GPIO2 behavior on bootup

Hi, Yes, GPIO2 can function as U1TXD. More informations about pin definitions about ESP8266EX, you can refer to "0D-ESP8266__Pin_List__Release_15-11-2014.xlsx" which can be obtained in the following link. http://bbs.espressif.com/viewtopic.php?f=51&t=818 More questions, please feel fre...
by Espressif_Kelly
Fri Apr 29, 2016 3:16 pm
Forum: ESP8266 HDK
Topic: GPIO0 behavior on bootup
Replies: 2
Views: 2885

Re: GPIO0 behavior on bootup

Hi, 1.Wifi chip will have an internal reset in 30ms ~50ms after CHIP_EN has been pulled up. 2.And then GPIO0 will output the clock frequency (e.g 26MHz) of the external cystal by default. 3.After that, voltage of GPIO15, GPIO0 and GPIO2 will be sampled and ESP8266EX will choose the boot mode. 4.Afte...

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