DISCO-L072CZ-LRWAN1

The B-L072Z-LRWAN1 LoRa®Discovery kit is a development tool to learn and develop solutions based on LoRa®and FSK/OOK technologies.

Overview

The B-L072Z-LRWAN1 LoRa®Discovery kit is a development tool to learn and develop solutions based on LoRa®and FSK/OOK technologies. This Discovery kit features an all-in-one open module CMWX1ZZABZ-091 (by Murata). The module is powered by an STM32L072CZ and an SX1276 transceiver. The transceiver features the LoRa®long-range modem, providing ultra-long-range spread spectrum communication and high interference immunity, minimizing current consumption. Since CMWX1ZZABZ-091 is an open module, user has access to all STM32L072 peripherals such as ADC, 16-bit timer, LP-UART, I2C, SPI and USB 2.0 FS (supporting BCD and LPM).

The B-L072Z-LRWAN1 Discovery kit includes an ST-LINK/V2-1 embedded debug tool interface, LEDs, push-buttons, antenna, Arduino™Uno V3 connectors and USB OTG connector in Micro-B format.


Microcontroller features

  • CMWX1ZZABZ-091 LoRa® module with STM32L072CZ
  • ARM® 32-bit Cortex®-M0+ CPU
  • 32 MHz max CPU frequency
  • VDD from 1.65 V to 3.6 V
  • 192 KB Flash
  • 20 KB SRAM
  • GPIO (40) with external interrupt capability
  • General-purpose Timer (4)
  • Basic Timer (2)
  • Low Power Timer
  • SPI (6)
  • I2S
  • I2C (3)
  • USART (4)
  • Low-power UART
  • USB 2.0 full-speed
  • 12-bit ADC with 13 channels
  • 12-bit DAC (2) with 1 channel each
  • Comparators (2)
  • RTC
  • Capacitive sensing channels (19)
  • Random Generator (TRNG for HW entropy)


Board features

  • Two types of extension resources
    • Arduino Uno Revision 3 connectivity
    • STMicroelectronics extension pin headers for full access to all STM32 I/Os
  • On-board ST-LINK/V2-1 debugger/programmer with SWD connector
    • Selection-mode switch to use the kit as a standalone ST-LINK/V2-1
  • Flexible board power supply
    • USB VBUS or external source (3.3 V, 5 V, 7 - 12 V)
    • Power management access point
  • User LED (LD1, LD2, LD3, LD4)
  • Two push buttons: USER and RESET
  • USB re-enumeration capability: three different interfaces supported on USB
    • Virtual Com port
    • Mass storage (USB Disk drive) for drag'n'drop programming
    • Debug port


Board pinout


Pins Legend

/media/uploads/bcostm/pinout_legend_2017-06-28-2.png

You can find more details on the available pins and labels in the PeripheralPins.c and PinNames.h files.

These files can be found in:

  • ARMmbed/mbed-os repository on GitHub (up-to-date version, used with mbed CLI commands)

https://github.com/ARMmbed/mbed-os/blob/master/targets/TARGET_STM/TARGET_STM32L0/TARGET_STM32L072xZ/TARGET_DISCO_L072CZ_LRWAN1/

  • mbed-dev library in developer.mbed.org (source files of the mbed library used on mbed compiler IDE)

https://developer.mbed.org/users/mbed_official/code/mbed-dev/file/default/targets/TARGET_STM/TARGET_STM32L0/TARGET_STM32L072xZ/TARGET_DISCO_L072CZ_LRWAN1/


Arduino-compatible headers

/media/uploads/bcostm/disco_l072cz_lrwan1_2017-06-30_s1.png /media/uploads/bcostm/disco_l072cz_lrwan1_2017-06-30_s2.png

Morpho headers

/media/uploads/bcostm/disco_l072cz_lrwan1_2017-06-30_s3.png /media/uploads/bcostm/disco_l072cz_lrwan1_2017-06-30_s4.png


Supported shields

ST X-NUCLEO boards

See Matrix of tested boards.

Other Non-ST boards

See here.


Technical references

For more information, please refer to:


Known limitations

The following section describes known limitations of the platform. Note that general issues are tracked into the mbed repository available on GitHub.

  • There is no AnalogIn on Arduino A1, A3, A4, A5 pins.
  • There is no PWM on Arduino D3, D5, D6, D9 pins.
  • In order to use Serial (TX and RX) on Arduino D0 and D1 pins, you have to remove SB28 and SB29 solder bridges. In this case you will lose the ST-Link connection.
  • The C24 capacitor must be removed if the MCO clock configuration is selected (SB36 closed and USE_PLL_HSE_EXTC config enabled in targets.json file).


Tips and Tricks

Find more information in ST WIKI pages.

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