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MAMWLExx - Move Solutions

MAMWLExx - Move Solutions

7. HOW TO PROGRAM & DEBUG THE MAMWLEXX

HOW TO DEVELOP WITH MAMWLEXX

The MAMWLExx is compatible with all the software development environment that works

for the STM32 microcontroller series (e.g. STM32CubeIDE, Keil uVision, IAR Embedded).

The RF switch that selects the Tx/Rx path of the module is controlled by the STM32WL by

three GPIOs. Those GPIOs (PC3, PC4, PC5) aren’t output in the MAMWLExx footprint, but must

be driven in the firmware to use the RF part as desired (see tab). Same thing applies to pin

PB0 of the STM32WL that is connected (internally to the module) at the TCXO alimentation.

TCXO must be ON when using the RF part and can be OFF the rest of the time reducing the

overall consumption.

This choice of control pins for the RF switch and the TCXO is the same as ST Microelectronics.

In this way the user can run without further modification the code examples that comes

within the firmware packages released by ST for the STM32WL series.

Those example in the firmware packages are also the best way to start a new project with

the MAMWLExx.

HOW TO PROGRAM & DEBUG

There are many way to program and debug the MAMWLExx. The MAMWLExx comes with an

internal bootloader that support boot from SPI and USART, in addition the module can also

be programmed and debugged via the JTAG/SWD interface.

The best way to access those interfaces for programming is through the ST-LINK V3

debugger/programmer for STM32 micro series. The ST-link act like a bridge between the

board and the PC. It communicates with the PC via a microB-USB cable and has many

headers for connecting with various subsets of the SPI/USART/JTAG/SWD intefaces of the

module. If you would like to program using SPI or USART see

AN2606 from ST first because

there are some details that you must pay attention of. For example if you would like to

RF front-end configuration

PC4

PC5

PC3

TX high output power

Low

High

High

TX low output power

High

High

High

RX

High

Low

High

Power -down

Low

Low

Low

The u.FL connector is already applied on the top of the module with a high performance

Pi Filter, so there is no need to design any RF circuit to implement the module. To give the

best flexibility to the designer MAMWLExx implements a 50 Ohm pin antenna to enhance

a complete custom antenna design.

The module can implement Over-The-Air Firmware updates.

USING HEADER CN1 OF ST-LINK:

CN1 support the SWD/JTAG interface for programming and debugging the application

and provides a virtual com port (COM or VCP) that make simple printing string in a serial

terminal. To be able to connect the board to CN1, the board should have a twin header of

CN1 connected to the module like shown in the figure. While programming through CN1 is

not necessary to connect BOOT0 to VCC.

STM32 CUBE IDE,

KEIL,

OTHER...

MAMWLE

BOARD

ST-LINK

USB

FLAT RIBBON

(comes with ST-LINK)

boot from USART1 only pin PA9, PA10 (and not on all pins that support USART1) are fine.

Among all the possible ST-link V3 headers, below we indicate an easy way of connection

that suits either programming and debugging. For further information on other ST-link

possibility please see the

UM2448 user manual from ST.