Ameba IoT Forum & Facebook Group
Where to buy Ameba RTL8722DM Board?
Refer to Purchase link.
Which Bluetooth standards are supported by RTL8722CSM/RTL8722DM?
Both boards support BLE 5.0. Classic Bluetooth (BR/EDR) is not supported.
Which BLE roles are supported?
RTL8722CSM/RTL8722DM can operate as either a BLE Central or BLE Peripheral device.
Are all pins on RTL8722CSM/RTL8722DM usable?
No, those marked
NCare not connected to any pin and thus unusable.
Is XIP (execute in place) supported on RTL8722CSM/RTL8722DM?
Yes, it is supported.
Does RTL8722CSM support 5G WiFi?
No. Only RTL8722DM supports dual band 2.4G + 5G WiFi. RTL8722CSM only supports single band 2.4G WiFi.
How to enter the download mode?
Press and hold the UART DOWNLOAD button. Then Press the RESET button and release both UART DOWNLOAD and RESET buttons.
RTL8722CSM/RTL8722DM cannot be found as a Bluetooth device.
Please make sure the antenna is connected properly. Check your code for the correct Bluetooth configurations.
My code is not behaving as I expected.
Try to debug your program using
Serial.print()statements. If the issue persists, you can ask for help at Forums
Why is there no output on my serial terminal after connecting to RTL8722CSM/RTL8722DM UART?
RTL8722CSM/RTL8722DM is by default configured at 115200 baudrate, please check if your serial terminal is configured to 115200.
My program is not being downloaded into RTL8722CSM/RTL8722DM?
- Please follow the procedure for the correct downloading：
Enter the download mode. The on-board Green LED will blink when entered download mode.
When downloading the image into board the on-board Red LED will blink
After a successful download, you will see log like this “All images sent successfully”.
Sometimes WiFi signal is weak?
The default antenna for RTL8722CSM/RTL8722DM uses the I-Pex Connector. Please change/connect the I-Pex Connector antenna.
Why is my board not powering up?
Please make sure the connector J38 beside resistor R43 is connected. The connector is used to link the power to IC.
If you have driver issue to connect board to your computer?
Please go to https://ftdichip.com/drivers/ for USB driver.