Search found 58 matches

by YimingLi
Thu Jul 20, 2017 6:28 pm
Forum: ESP8266 SDK
Topic: 【ESP8266模块案例】单片机通过EPS8266模块实现有效速度超过M字节高速传输 并内嵌多功能WEB服务器
Replies: 0
Views: 3538

【ESP8266模块案例】单片机通过EPS8266模块实现有效速度超过M字节高速传输 并内嵌多功能WEB服务器

单片机通过EPS8266模块实现有效速度超过M字节高速传输 并内嵌多功能WEB服务器 https://item.taobao.com/item.htm?id=576141575067 基于乐鑫ESP8266芯片做的单片机高速WIFI模块,功能全面和实用、高速、高效、可靠、灵活 适合单片机应用,批量化产品验证: 1. 有效通信速度快,效率高,通信实时性好 1.1 “实测的”“有效”吞吐速度高,超过M字节每秒(MBytes/s),所以可用来传输音视频或大量数据 1.2 准实时性收发,连续发包之间的间隔可在ms级或us级,可适应一些对传输性实时性有要求的场合。 2. 稳定可靠不丢包,长时间通信不掉...
by YimingLi
Thu Jul 20, 2017 5:47 pm
Forum: ESP8266 SDK
Topic: 你好,我遇到这种SDK错误该怎样解决呢?
Replies: 4
Views: 5441

Re: 你好,我遇到这种SDK错误该怎样解决呢?

SDK库里的函数源码,前面没有加 ICACHE_FLASH_ATTR的函数,最好不要随便加。因为,是否在函数前加 ICACHE_FLASH_ATTR, 并非仅仅取决于该函数是否为中断处理函数,而在于每次调用这个函数执行的时候,是否可以从从外部flash里载入。 因为这个标志,代表的就是这个意思。 例如,如果某个函数虽然不是中断处理函数,但是它被中断处理函数给调用了;或者,如果某个函数会被频繁调用了,即使它不是中断处理函数...... 做好也别随意添加ICACHE_FLASH_ATTR,否则,如果每次执行该函数都需要去读取一次SPI FLASH,这可能会影响到处理速度和系统性能的。例如,这里的u...
by YimingLi
Wed Jul 19, 2017 10:40 am
Forum: ESP8266 SDK
Topic: 乐鑫的ESP8266 WIFI解决方案,不仅仅只是一个UART串口转WIFI的透传模块!
Replies: 1
Views: 5254

乐鑫的ESP8266 WIFI解决方案,不仅仅只是一个UART串口转WIFI的透传模块!

近期在有关ESP8266的一些技术群里,常遇到的几个问题的,这里有一些解决思路,和大家分享一下,仅供参考,欢迎斧正。 【目的】(1)希望以后大家若遇到类似问题能有所参考。(2)也不要轻易就因为某些误解或谬论流传而误以为“乐鑫芯片弱”就放弃了;一些有影响力的模块供应商及其技术支持人员,可能因为自己的模块所支持的功能有局限,或者因为自己误解,也常见他们将责任归咎于“乐鑫芯片弱”或“SDK不支持”;所以,在这里顺便做一个澄清: 实际上,有可能是自己没有用好或做好乐鑫的芯片,或者没有把乐鑫的功能代码给集成进来。(3)希望大家一起来,多多挖掘和拓展乐鑫ESP8266芯片及其SDK库做提供的更多更好的功能...
by YimingLi
Tue Jun 13, 2017 1:23 pm
Forum: ESP8266 SDK
Topic: what is the purpose or scenario that remote ip and port should be set again before each calling of espconn_send?
Replies: 2
Views: 1421

Re: what is the purpose or scenario that remote ip and port should be set again before each calling of espconn_send?

Accoring to my testing experience, espconn_sendto() from SDK older than 2.0.0 has a BIG bug (dollar:p) and not verified it on 2.0.0 or later version(however, it seems that there is no such a bug fix according to the release notes). Therefore, I would rather use espconn_send()/espconn_sent() for UDP ...
by YimingLi
Fri Jun 09, 2017 11:01 am
Forum: ESP8266 SDK
Topic: what is the purpose or scenario that remote ip and port should be set again before each calling of espconn_send?
Replies: 2
Views: 1421

what is the purpose or scenario that remote ip and port should be set again before each calling of espconn_send?

Hi, Espressif, [Question] What is the purpose or scenario that remote ip and remote port should be set again before each calling of espconn_send()? If we use it only for one-to-one repeative UDP communication, is it still a must? [Description] The docuement "2c-esp8266-non-os-sdk-api-reference&...
by YimingLi
Sat May 27, 2017 10:28 am
Forum: ESP8266 HDK
Topic: Radio section failing on chips
Replies: 2
Views: 1889

Re: Radio section failing on chips

Hi, Have you checked (1) whether the pin 2 and pin 31 are still solder well and (2) whether the rf frequency is still calibrated well. The (2) might be the more possible cause. Possibly your crystal circuit is not good enough and has much more frequncy drift due to aging. You may have a try to repla...
by YimingLi
Sat May 20, 2017 11:18 am
Forum: ESP8266 HDK
Topic: ESP8266重新上电起来后,找不到AP
Replies: 1
Views: 2487

Re: ESP8266重新上电起来后,找不到AP

你好! 如果不是硬件上的问题(例如临时供电不够因为扫描时耗电较多、或者晶体及其牵引电容虚焊了导致晶体输出的频率不准),那么概率可能是你的射频参数配置区做得不合适。请你参看文档《2a-esp8266-sdk_getting_started_guide》第6.3.3章有关射频参数校准的设置,或许详情。里面也有例子,不难理解。 如果你的模块的射频参数选择的是从零开始的射频自动校准,且你的晶体输出频率偏差较大(例如晶体本身偶尔的振荡偏差、或者外部牵引电容的虚接等等,都会导致晶体的频率在某时刻偏差大),那么当没有连接上热点时,是可能找到不到AP的,因为此时最初的参数是没有做射频校准的,因为频偏较大所以会...
by YimingLi
Sat May 20, 2017 10:58 am
Forum: ESP8266 HDK
Topic: 请问,ESP8266 wifi模块的串口,接收数据最大效率是多少?
Replies: 3
Views: 12251

Re: 请问,ESP8266 wifi模块的串口,接收数据最大效率是多少?

Hi, If you can not accept the wifi speed with uart bottleneck, you may please consider using ESP8266 HSPI interface with the host MCU to achive a faster communication speed. There is a selling handreds of users are using or have mass deployed: from eBay external China http://www.ebay.com/itm/2822553...
by YimingLi
Wed Apr 12, 2017 10:09 am
Forum: ESP8266 HDK
Topic: Where can we get the EMC test data/report of ESP-WROOM-02?
Replies: 3
Views: 1850

Re: Where can we get the EMC test data/report of ESP-WROOM-02?

Thanks, Pratik. Appreciated.

That is, a well-designed board might lead the metal shield unnecessary. As we know, even there is a crystal and SPI Flash, the frequencies of them are not too high, and the size is not too large to be handled easily.

Best,

Yiming
by YimingLi
Mon Apr 10, 2017 7:59 pm
Forum: ESP8266 SDK
Topic: Can Espressif give more detailed description about those errors of ESPCONN_IF and ESPCONN_ARG?
Replies: 1
Views: 1210

Can Espressif give more detailed description about those errors of ESPCONN_IF and ESPCONN_ARG?

Hi Espressif, Can you please share a little more detailed description about those errors such as ESPCONN_IF and ESPCONN_ARG? The SDK document explain them too rough and simple, just saying hardware error or parameter error. Actually with the print debug, these two errors are often or occasionally, b...

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