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Customer Product Hardware Design Guidance - PCIe Design
1. The PCIe wiring connecting the HOST CPU end and module end should be as long and parallel as possible.
In addition, PCIe wiring must avoid proximity to power or CLK wiring.
2. The PCIe wiring impedance needs to be controlled at 100 ohms. PCIe TXP/TXN is a set of parallel and equally long differential pairs that need to be processed on both sides; RXP/RXN is a set of parallel equal length differential pairs that need to be processed on both sides; RCLKP/RCLKN is a set of parallel and equal length differential pairs, with both sides wrapped to avoid interference.
 
3. The next layer of the module needs to be fully paved, and it is prohibited for power or CLK wiring to pass through the lower edge of the module or the next layer.
4. The circuit diagram for PCIe reference design is as follows. The host end TX needs to be connected in series with a 0. luF DC isolation capacitor and close to the host.
5. The TX of the Host is connected to the RX of the Module, similarly, the RX of the Host is connected to the TX of the Module.
 
Customer Product Hardware Design Guide - Power Supply Design
1. In terms of power wiring, it is recommended to route the star wire, and the trace width is greater than 14mil.
 
2. The power supply pin of the module must have at least 4.7uF of the regulator capacitor close to the module, and the regulator capacitor of the power supply must be placed at the same level as the module as much as possible.
3. The power circuit should avoid forming a large loop. It is better to have full formations.
 
4. The grounding pin should be passed to the ground separately, to avoid several pins connected to one piece and then through the hole to the ground.
5. Provide sufficient power supply capacity according to the specifications of the module.
Customer Product Hardware Design Guide - PCB Stack

Customer Product Hardware Design Guide - PCB Stack

How to Enable HT40 Mode in 2.4g for Qualcomm Modules

Qualcomm module 2.4G will not enable HT40 requires the following
/lib/firmware/wlan/qcom_cfg.ini File add gChannelBonding Mode24GHz=1 or 2
1: HT40+ 2: HT40- 1~7 channels Can be used HT 40+, 5~13 channels available HT40-

Bluetooth automatic pairing function settings for Realtek WIFI+BT module

rtkbt/code/bt/include/bt_target.h
/* The IO capability of the local device (for Simple Pairing) */
#ifndef BTM_LOCAL_IO_CAPS
-#define BTM_LOCAL_IO_ CAPS BTM_IO_CAP_IO
+#define BTM_LOCAL_IO_CAPS BTM_IO_CAP_NONE
#endif
The above configuration is only available for TV drivers, and when you get the driver, pay attention to ask whether it is a TV version driver.

Method for enabling roaming function in the Realtek module

To enable roaming, simply turn on both macros in autoconfig.h.
#define CONFIG_LAYER2_ROAMING
#define CONFIG_LAYER2_ROAMING_RESUME

The above opening is for the Linux/Android system.

RTL_ Instructions for using WIFI fixed frequency testing software

Find Data\ 8188EU.ini in the windows driver file, change the following location to solve the problem of popping out of the WPS configuration interface.

WiFiProtectSetPage_SHOW = 0

External_Registrar_SHOW =0

Just reinstall. It is also possible to modify the corresponding files directly in the installation directory.

Solution to Driver WPS Error during Windows Driver Installation

Find Data\ 8188EU.ini in the windows driver file, change the following location to solve the problem of popping out of the WPS configuration interface.

WiFiProtectSetPage_SHOW = 0

External_Registrar_SHOW =0

Just reinstall. It is also possible to modify the corresponding files directly in the installation directory.

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