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example: set default SPI flash mode to 40Mhz for iperf example

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Set default SPI flash frequency to 40Mhz for iperf example to avoid random crash for ESP32-WROVER-KIT (v3).
This commit is contained in:
Liu Zhi Fu 2018-02-08 15:25:34 +08:00
parent 1e8ab3d18e
commit b4ca03c48b
2 changed files with 7 additions and 1 deletions
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6
examples/wifi/iperf/README.md
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@ -1,5 +1,11 @@
# 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.
## Introduction
This example implements the protocol used by the common performance measurement tool [iPerf](https://iperf.fr/).
Performance can be measured between two ESP32s running this example, or between a single ESP32 and a computer running the iPerf tool

2
examples/wifi/iperf/sdkconfig.defaults
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@ -24,6 +24,6 @@ CONFIG_TCPIP_RECVMBOX_SIZE=64
CONFIG_LWIP_ETHARP_TRUST_IP_MAC=
CONFIG_FLASHMODE_QIO=y
CONFIG_ESPTOOLPY_FLASHFREQ_80M=y
CONFIG_ESPTOOLPY_FLASHFREQ_40M=y
CONFIG_LWIP_IRAM_OPTIMIZATION=y