mirror of https://github.com/OpenIPC/wiki.git
60 lines
3.0 KiB
Markdown
60 lines
3.0 KiB
Markdown
# OpenIPC Wiki
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[Table of Content](../README.md)
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Instructions for Using BL-M8812EU2 (or other RTL8812EU-based) Wi-Fi Module in FPV Firmware
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---
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[LB-LINK's BL-M8812EU2 module](https://www.lb-link.com/product_36_183.html)
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Another FPV Wi-Fi adaptor choice with high TX power (>29dBm) and low cost.
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### Hardware
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#### Where to buy
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Since the RTL8812EU chip is fairly new, there are no sellers on Aliexpress now.
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But when considering that it comes from the same supplier as the widely sold BL-R8812AF1, it's only a matter of time before it becomes readily available.
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However, you can still find any Taobao agent and buy the module from [here](https://item.taobao.com/item.htm?id=764510955987).
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#### Wiring
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Connect ```USB2.0+DP```, ```USB2.0-DM``` with a twisted wire pair to the IPC's USB. A GND connection to IPC is also required.
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Connect ```GND``` and ```VDD5.0``` to a 5V/>3A power supply to power the module.
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Connect two 5GHz antennas to the IPEX connector J0 and J1 before transmission.
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The Pin 9~18 are GND and can be left floating.
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Ref.: https://oshwhub.com/libc0607/bl-m8812eu2-demoboard-v1p0
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### Add the Driver to OpenIPC Firmware
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Because of the very limited flash space, the driver is disabled by default.
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You need to compile firmware from source code to enable it.
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#### Step 1. Prepare
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Follow the guide in [source-code.md](https://github.com/libc0607/openipc-wiki/blob/master/en/source-code.md) till you successfully build your firmware.
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#### Step 2. Add BR2_PACKAGE to Board Config
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Find your target board config in ```br-ext-chip-*/config```, then add ```BR2_PACKAGE_RTL88X2EU_OPENIPC=y``` to it.
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If your IPC has an 8M/16M NOR Flash, you may need to disable other drivers (e.g. RTL8812AU) to save space.
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#### Step 3. Check CONFIG_WIRELESS_EXT in Kernel Config
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The driver needs ```CONFIG_WIRELESS_EXT``` enabled in kernel config, which can be found at ```br-ext-chip-*/board/*/kernel/*-fpv.config```.
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This macro has been set in SigmaStar, but you should check it when using Hisilicon or GOKE.
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#### Step 4. Build the firmware
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```
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make
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```
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Then you can use ```output/images/rootfs.squashfs.*``` and ```output/images/uImage.*``` with ```sysupgrade```.
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### Usage
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It's almost the same as RTL8812AU adaptors.
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#### Set TX Power
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There are two ways to set TX power.
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- ```driver_txpower_override``` in ```/etc/wfb.conf```. The range is ```0~63```
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- ```iw dev <wlan0> set txpower fixed <mBm>```. The range is ```0~3150```, and can be set dynamically when transmitting.
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For the BL-M8812EU2 module, I recommend setting ```driver_txpower_override``` to ```40~50``` as a higher value causes the amplifier to be saturated.
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The power consumption of a BL-M8812EU2 module can reach 5V/2.xA when ```driver_txpower_override > ~40```.
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Use a proper 5V power supply and a HEAT SINK WITH FAN.
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