Ebyte E22-400T22S1C, Руководство пользователя

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Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T22S1C User manual
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd.
13
6.1 Mode switching
No. Remark
1

Users can combine M1 and M0 with high and low levels to determine the operating mode. Two GPIOs of the
MCU can be used to control mode switching;

After changing M1 and M0: If the module is idle, after 1ms, it can start working according to the new mode;

If the serial port data of the module has not been transmitted through the wireless, the new working mode can
be switched after the transmission is completed;

If the module receives the wireless data and transmits the data through the serial port, it needs to finish
transmission before switching the new working mode;

Therefore, mode switching can only be valid when AUX output is 1, otherwise it will delay switching.
2

For example, users continuously inputs a large amount of data and simultaneously performs mode switching. At
this time, the switching mode operation is invalid; the module will process all the user data before performing the
new mode detection;

Therefore, the general recommendation is to detect the output state of the AUX pin and switch after 2ms when
the output is high.
3

When the module is switched from other modes to sleep mode, if the data has not been processed yet;

The module will process these data (including receiving and sending) before entering sleep mode. This feature
can be used for fast sleep, which saves power; for example, the transmitter module works in mode 0, the user
transmits the serial port data "12345", and then does not have to wait for the AUX pin to be idle (high level), and
can directly switch to sleep mode. And the user's main MCU immediately sleeps, the module will automatically
transmit the user data through the wireless, and automatically enters sleep within 1ms;

This saves MCU's working time and reduces power consumption.
4

Similarly, any mode switching can use this feature. After the module processes the current mode event, it will
automatically enter the new mode within 1ms; thus eliminating the need for the user to query AUX and achieve
the purpose of fast switching;

For example, switching from the transmit mode to the receive mode; the user MCU can also enter sleep before
the mode switch, and use the external interrupt function to acquire the AUX change, thereby performing mode
switching.
5

This operation mode is very flexible and efficient, and is designed according to the user's MCU's operation
convenience, and can reduce the workload of the entire system as much as possible, improve system efficiency,
and reduce power consumption.
6.2 Normal mode（Mode 0）
Type M0 = 0，M1 = 0
Transmitting Users can input data through the serial port and the module will start wireless transmission.
Receiving
The module wireless receiving function is turned on, and after receiving the wireless data, it will be output through the
serial port TXD pin.