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.

Table of Contents

  1. Overview
  2. Microcontroller features
  3. Board features
  4. Board pinout
  5. Supported shields
  6. Technical references
  7. Known limitations
  8. Tips and Tricks

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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