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docs: udpate wifi document

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Update WiFi document
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Liu Zhi Fu 2018-11-07 22:08:29 +08:00
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docs/en/api-guides/wifi.rst
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examples/wifi/iperf/README.md
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# Iperf Example
## Note about 80Mhz flash frequency
The iperf can get better throughput if the SPI flash frequency is set to 80Mhz, but the system may crash in 80Mhz mode for ESP-WROVER-KIT V3.
Removing R140~R145 from the board can fix this issue. Currently the default SPI frequency is set to 40Mhz, if you want to change the SPI flash
frequency to 80Mhz, please make sure R140~R145 are removed from ESP-WROVER-KIT V3 or use ESP32 DevKitC.
## Note about iperf version
The iperf example doesn't support all features in standard iperf. It's compitable with iperf version 2.x.
## Note about 80MHz flash frequency
The iperf can get better throughput if the SPI flash frequency is set to 80MHz, but the system may crash in 80MHz mode for ESP-WROVER-KIT.
Removing R140~R145 from the board can fix this issue. Currently the default SPI frequency is set to 40MHz, if you want to change the SPI flash
frequency to 80MHz, please make sure R140~R145 are removed from ESP-WROVER-KIT or use ESP32 DevKitC.
## Introduction
This example implements the protocol used by the common performance measurement tool [iPerf](https://iperf.fr/).