Chengdu Ebyte Electronic Technology Co., Ltd. E77-xxxM22S User Manual
Copyright © 2012-2 024 , Chengdu Ebyte Electronic Technology Co., Ltd.
8 Secondary Development
Please refer to the E77-400M22S DEMO routine provided by Chengdu Yibyte official website. This routine only
demonstrates simple transceiver functions in LoRa
TM modulation and demodulation mode
;
LoRaWAN
TM
development, please download and refer to the instructions in the stm32cubewl library file of ST
Company, and use the stm32cubemx software to generate the protocol stack project of the relevant development
platform ;
When developing LoRaWAN
TM
, when using the passive crystal oscillator version module, please use software to
adjust the internal load capacitance of the crystal oscillator. Recommended value: XTAL_DEFAULT_CAP_VALUE
= 0x0B;
There is no need to adjust the crystal load capacitance when using the active crystal oscillator version module.
Modules with sn codes starting from xxxxx are all active crystal oscillator versions.
There are two points where the active crystal oscillator needs to be modified:
①In the BSP_RADIO_IsTCXO() function in stm32wlxx_nucleo_radio.c,change return
RADIO_CONF_TCXO_NOT_SUPPORTED to return RADIO_CONF_TCXO_SUPPORTED;
② Select TCXO for the external clock when configuring stm32cubemx
PA6 and PA7 pins are used as internal control radio frequency switches in the module. PA6 = RF_TXEN, PA7 =
RF_RXEN, RF_TXEN=1 RF_RXEN=0 is the sending channel, RF_TXEN=0 RF_RXEN=1 is the receiving
channel; RF_TXEN and RF_RXEN cannot be high at the same time. flat or low level ;
How to distinguish hardware versions:
The E77-400M22S module includes an active crystal oscillator version and a passive crystal oscillator version.
Users can distinguish them according to the production batch number of the module SN code. The production batch
number ≥3202995 is the active crystal oscillator version module (user-customized passive Except for the crystal
oscillator version), the rest are passive crystal oscillator versions.
SN code description: S3202995S00001, 3202995 is the production batch, and 00001 is the production serial number.
To Next Page
Loading...
Need help?
General
