Ai-Thinker LoRa series module: SX1278/SX1268/LLCC68 Can communicate with each other?

Developers who know Ai-Thinker products must be familiar with the Ra-01/Ra-02 modules, which are designed and developed based on Semtech's SX1278 chip and focus on long-distance smart meters, smart agriculture, smart security, building automation and other markets.

In addition, there are SX126X series and LLCC68 series of ANCenker LoRa series. Today, we mainly introduce how to replace Ai-Thinker LoRa modules, and realize mutual replacement and communication. The modules involved mainly include the following series and models:

01 Hardware pin

First of all, look at the figure, here to emphasize that in terms of hardware design, the basic package of these three series of modules are the same, only a few interrupt the foot of the bit number is different, as long as according to the following figure reserved wiring, you can achieve the functions of LoRa, different series of LoRa modules can also switch to each other.

Note: In addition to the wiring of SPI, we can see that there are multiple DIO pins on our SX127x series. These pins are some functional interrupt pins encountered in our LoRa modulation, which can be referred to the following table:

For the 126x and LLCC68 series, he integrated all of these functional pins, leaving only a BUSY notification pin, which is the basis for judging the current program logic.

02 Software driven

Software driver It is worth noting that because the LoRa modulation described here is the use of underlying register driven modulation, so everyone's writing may have a big difference. If you want a copy of the standard library driver, then the official routine is probably the best choice.

In addition, Ai-Thinker can also provide the basic source code in accordance with the above wiring, and it has been run through, as long as a little transplantation can run on their own microcontroller.

As for substitutions, just focus on the following:

The hardware can be upgraded and switched by wiring as shown above.

The 127x series code cannot be used for 126x or LLCC68, and the code must be rewritten if it is replaced.

LLCC68 and 126x series can share a set of code, but the number parameters are not fully compatible, please follow the chip manual configuration. The above is all the content of this issue, as long as the wiring is reserved according to the diagram, and the software parameter configuration specification, these series of LoRa can communicate with each other.

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