Search found 58 matches

by YimingLi
Mon Apr 10, 2017 7:45 pm
Forum: ESP8266 HDK
Topic: Where can we get the EMC test data/report of ESP-WROOM-02?
Replies: 3
Views: 1996

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

Hi Espressif, Can we get the EMC test data/report of the ESP-WROOM-02? And where? We notice that the ESP8266 chip is highly intergrated inside-chip with nearly all RF circuits including the Switch/Balun/PA/LNA.... Meanwhile, the only RF external to the chip, matching components, occupy very small ro...
by YimingLi
Sat Apr 08, 2017 10:52 pm
Forum: ESP8266 HDK
Topic: What is the real Impedance of ESP8266 LNA?
Replies: 1
Views: 1778

What is the real Impedance of ESP8266 LNA?

Hi, In the datasheet 0a-esp8266-datasheet document, it says "LNA, RF Antenna Interface. Chip Output Impedance=50Ω No matching required. It is suggested to retain the π-type matching network to match the antenna." However, in the ducument "esp8266-hardware matching guide", it says...
by YimingLi
Sat Feb 18, 2017 1:47 am
Forum: ESP8266 HDK
Topic: What are the Setup and Hold Timing Parameters of HSPI Slave?
Replies: 0
Views: 1231

What are the Setup and Hold Timing Parameters of HSPI Slave?

Hi Espressif,

What are the Setup and Hold Parameters of HSPI Slave on the PIN10(HSPI MISO) and PIN12 (HSPI MOSI) as a SPI slave ?

Thanks!

Yiming Li
by YimingLi
Wed Dec 07, 2016 12:02 am
Forum: ESP8266 SDK
Topic: What might be the causes of "ESPCONN_IF" error?
Replies: 1
Views: 1140

Re: What might be the causes of "ESPCONN_IF" error?

Can Anyone give some hints here?!

Thanks

Yiming
by YimingLi
Fri Dec 02, 2016 1:13 am
Forum: ESP8266 SDK
Topic: PWM can not get supported as well in NON-OS SDK2.0.0 AT version
Replies: 3
Views: 7295

Re: PWM can not get supported as well in NON-OS SDK2.0.0 AT version

Thanks.

But make no difference, still gives " section '.text' will not fit in region iram1_0_seg".

Yiming Li
by YimingLi
Fri Dec 02, 2016 12:53 am
Forum: ESP8266 SDK
Topic: What might be the causes of "ESPCONN_IF" error?
Replies: 1
Views: 1140

What might be the causes of "ESPCONN_IF" error?

Hi Espressif, What might be the causes of "ESPCONN_IF" returned by espconn_sendto() to send UDP data, and how to fix it or handle it? sdk: 1.5.4 NON-OS Here below is the reproduction scenario: 1. We call espconn_sendto() to continuously send udp packet of 1024 bytes as below: (1) espconn_s...
by YimingLi
Tue Nov 01, 2016 11:17 pm
Forum: ESP8266 SDK
Topic: PWM can not get supported as well in NON-OS SDK2.0.0 AT version
Replies: 3
Views: 7295

PWM can not get supported as well in NON-OS SDK2.0.0 AT version

Hi Espressif, In the latest release of SDK 2.0.0 Non-OS, it is hard to add into PWM features by "-lpwm" during link with an error "section .text will not fit into region iram1_0 seg". However, this is not present in previous version such as SDK 1.4.0. Reproducing Steps: 1. unzip ...
by YimingLi
Tue Sep 20, 2016 12:28 pm
Forum: ESP8266 SDK
Topic: ESP8266模块的MAC地址,是怎么编写的?
Replies: 1
Views: 3996

Re: ESP8266模块的MAC地址,是怎么编写的?

Hi, It seems that the issue of different mac prefixes of whether 18-FE-34 or 5C-CF-7F is related to the chipset batches other than the SDK version. The latest batch of ESP8266 chip has provided a new feature to store (burn) the oui info as the MAC prefix in an on-chip register. However the previous ...
by YimingLi
Tue Sep 20, 2016 2:24 am
Forum: ESP8266 HDK
Topic: We really need a way to differenciate RESET and Wake Up from Deep Sleep
Replies: 11
Views: 10750

Re: [SOLVED} We really need a way to differenciate RESET and Wake Up from Deep Sleep

Hi, You could replace the nRESET with the PD pin for wakeup, and then the nRESET pin will stand alone for free usage. When wakeup from deep sleep, the GPIO16 will pullow and then release the PD/CH_EN (pulled up by an extern resistance) to perform a reset, just like a powe on reboot other than a rese...
by YimingLi
Tue Sep 20, 2016 12:48 am
Forum: ESP8266 SDK
Topic: Script to read chip ID ?
Replies: 1
Views: 2874

Re: Script to read chip ID ?

Hi, to read out the chip ID is rather simple following below steps: (1) bring the chip into boot from uart0 mode, i.e. perform a power reboot with gpio15 pulled low, gpio0 pulled low, and gpio2 pulled high or float (2) communicate with chip via serial port in a sequence of synchronization. (3) commu...

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