ST STSW-ST25DV002 User manual
Introduction
This document describes the functionalities of the STSW-ST25DV002 firmware, developed to take full advantage of the
ST25DV64KC-DISCO board functionalities, working with any dynamic tag of the ST25DV-I2C Series.
In this document, the dynamic tag series from STMicroelecronics is referred to as ST25DV-I2C tags.
The ST25DV-I2C tags are integrated circuits (IC) for contactless applications that communicate with a microcontroller through
an I2C interface; this makes this device a dynamic tag. On the RF side, the reader (for instance a smart phone) retrieves and
updates the content of the tag when close by.
The reader communicates with the ST25DV64KC-DISCO board using the ISO 15693 protocol, while the STM32L476xx
microcontroller device communicates with the ST25DV-I2C tag through an I2C bus.
With this discovery kit, the ST25DV-I2C tag is ready to receive any content, following the NFC Forum standard. This means that
a smart phone is able to natively read it, without having previously installed any specific application.
A specific Fast transfer mode allows the user to transfer data directly to the microcontroller, without using the embedded
EEPROM.
STSW-ST25DV002 firmware for the ST25DV64KC-DISCO board
UM2949
User manual
UM2949 - Rev 1 - February 2022
For further information contact your local STMicroelectronics sales office.
www.st.com
1General information
This document applies to the STM32L476xx Arm®-based microcontroller devices.
Note: Arm is a registered trademark of Arm Limited (or its subsidiaries) in the US and/or elsewhere.
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2List of acronyms and notational conventions
2.1 List of acronyms
Table 1. Acronyms
Acronym Definition
APB Advanced peripheral bus
AAR Android™ application record
BLE Bluetooth® Low Energy
CAN Controller area network
GPS Global positioning system
GPO General purpose output
H2R Host to reader
IEC International electrotechnical commission
ISO International standards organization
MCU Micro controller unit (microcontroller)
NFC Near field communication
OOB Out of band
R2H Reader to host
RF Radio frequency
RFID Radio frequency identification
RISC Reduced instruction set computer
SPI Serial peripheral interface
URI Uniform resource identifier
URL Uniform resource locator
USB Universal serial bus
2.2 Number convention and notation
The following conventions and notations apply in this document unless otherwise stated:
• Binary numbers are represented by strings of 0 and 1 digits starting with the most significant bit (MSB) on
the left followed by the least significant bit (LSB) on the right, and "0b" added at the beginning. Example:
0b11110101.
• Hexadecimal numbers are represented by using numbers 0 to 9 and characters A to F, and adding "0x" at
the beginning. The MSB is shown on the left and the LSB on the right. Example: 0xF5.
• Decimal numbers are represented without any leading character. Example: 245.
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3Overview
3.1 ST25DV-I2C tag
The ST25DV-I2C tag is a dynamic tag IC for contactless applications (ISO 15693). It manages the RF
communication with a reader. It also includes frame coding, RF modulation and manages the anti-collision
process.
The ST25DV-I2C tag works as an NFC Forum Type 5 tag, supporting: detection, read and write operations. As
shown in Figure 1, this device communicates with a reader without any external controller.
Figure 1. Communication scheme
MCU ST25DV-I2C RF
I2C
3.2 STM32L476xx microcontroller devices
The STM32L476xx microcontroller devices are ultra-low-power microcontrollers based on the high-performance
Arm® 32-bit RISC core operating at a frequency of up to 80 MHz. The Arm® Cortex®-M4 core features a
floating point unit (FPU) single precision, which supports all Arm® single-precision data-processing instructions
and data types. It also implements a full set of DSP instructions and a memory protection unit (MPU) to enhance
application security.
The STM32L476xx microcontroller devices embed high-speed memories (up to 1 Mbytes of Flash memory,
up to 128 Kbytes of SRAM), a flexible external memory controller (FSMC) for static memories (for devices
with packages of 100 pins and more), a Quad-SPI Flash memory interface (available on all packages) and an
extensive range of enhanced I/Os and peripherals connected to two APB buses, two AHB buses and a 32-bit
multi-AHB bus matrix.
The STM32L476xx microcontroller devices embed several protection mechanisms for embedded Flash memory
and SRAM: readout protection, write protection, proprietary code readout protection and firewall.
These devices offer up to three fast 12-bit ADCs (5 Msps), two comparators, two operational amplifiers, two
DAC channels, an internal voltage reference buffer, a low-power RTC, two general-purpose 32-bit timers, two
16-bit PWM timers dedicated to motor control, seven general-purpose 16-bit timers, and two 16-bit low-power
timers. The STM32L476xx microcontroller devices support four digital filters for external sigma delta modulators
(DFSDM).
In addition, up to 24 capacitive sensing channels are available. The devices also embed an integrated LCD driver
8x40 or 4x44, with internal step-up converter.
They also feature standard and advanced communication interfaces:
• Three I²Cs
• Three SPIs
• Three USARTs, two UARTs and one Low-power UART.
• Two SAIs (serial audio interfaces)
• One SDMMC
• One CAN
• One USB OTG full-speed
• One SWPMI (single wire protocol master interface)
For full details of the STM32L476xx microcontroller device specifications, refer to www.st.com.
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3.3 ST25DV64KC-DISCO boards
The ST25DV64KC-DISCO is an evaluation kit, which allows the user to evaluate the performance of the ST25DV-
I2C tag dynamic tag. The kit is composed of two boards, namely a motherboard (see Figure 2) and the ST25DV-
I2C tag daughter board (see Figure 3).
3.3.1 ST25DV64KC-DISCO motherboard
The ST25DV64KC-DISCO (illustrated in Figure 2) is powered through the USB bus (micro and mini connectors)
and no external power supply is required.
This motherboard embeds the STM32L476VG microcontroller and different peripherals:
• LCD display and touchscreen to interface with the user
• USB connectors to connect to a PC (mini-USB for the ST-Link debugger and micro-USB available for the
user application)
• Optional modules: Wi‑Fi® and BLE to connect with a smart phone
The connectors on the right side of the board are dedicated to the daughter boards that embed the NFC tags.
Figure 2. ST25DV64KC-DISCO motherboard MB1396
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3.3.2 ST25DV-I2C tag daughter board
The ST25DVKC Discovery ANT C3 board (illustrated in Figure 3) embeds the ST25DV64KC device and a 40 mm
x 23 mm, 13.56 MHz double layer inductive etched antenna (no need for any tuning components).
The ST25DV64KC communicates with the STM32L476VG 32-bit MCU via the I²C bus.
Figure 3. ST25DVKC Discovery ANT C3 board
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4Firmware description
4.1 Prerequisite
The ST25DV-I2C tag is a dynamic tag, whose content and configuration is driven by both a microcontroller
(through I²C) and a reader through RF.
To benefit from the ST25DV64KC-DISCO demonstration kit, the user must have one of the following:
• A smart phone with the NFC enabled, combined with the ST25 NFC App installed on it. Refer to ST25
Android™ NFC tap application (UM2131), available on www.st.com for more information.
• An NFC reader, such as the CR95HF distributed with the M24LR discovery kit (M24LR-DISCOVERY). To
take full advantage of the ST25DV-I2C tag features, use CR95HF transceiver board firmware version 3.7.0
or higher, combined with the ST25PC-NFC software. Refer to Software toolbox for NFC tags user manual
(UM2444), available on www.st.com.
The ST25DV-I2C tag is fully compliant with the NFC Forum Type 5 standard. As this standard is recently
introduced, some features may not be fully supported by older smart phones.
4.2 Main menu
The main menu (Figure 4) is composed of three icons, used to access sub-menus.
Figure 4. ST25DV64KC-DISCO main menu display
Each item allows the user to enter a sub-menu containing a set of use cases as outlined. The sub-menus are
summarized in Table 2:
Table 2. Main menu item definition
Discover ST25DV-I2C tag Fast transfer mode demonstration NFC NDEF demonstrations
Note: If the Wi
‑
Fi® and/or the Bluetooth® Low Energy modules have been added to the board, the corresponding icons
are available to access the Wi
‑
Fi® and Bluetooth® pairing demonstrations.
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To select a category, touch the icon on the screen. To start a demonstration, touch the desired demonstration
icon on the screen (see description below). A long touch on an icon displays the description of the corresponding
demonstration(s) in the top line.
As the purpose of this document is to illustrate the firmware behavior, the descriptions are detailed from the
microcontroller point of view.
4.2.1 Discover ST25DV-I2C tag menu
As shown in Figure 5, the "Discover ST25DV-I2C tag" menu proposes several demonstrations of the ST25DV-I2C
tag specific features, among them:
• GPO interrupts in Section 4.2.2
• Energy harvesting in Section 4.2.3
• ST25DV-I2C tag states in Section 4.2.4
• Multi-areas and passwords in Section 4.2.5
Figure 5. ST25DV64KC-DISCO features main display
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4.2.2 RF GPO interrupt demonstration
The ST25DV-I2C tag has a GPO that is used to send interrupts to the microcontroller.
Several kinds of event on the RF side may be configured to trigger the GPO interrupt. In this demonstration
all possible interrupt sources are enabled, except for the "RF activity", which occurs too often for reasonable
readability when using a smart phone as a reader.
To start the demonstration, select the "GPO control demo" menu, this displays the instructions until it detects a
GPO interrupt.
As soon as the first GPO interrupt is received, the LCD displays the list of sources of received interrupt, and the
number of each interrupt occurrences (see Figure 6).
Figure 6. ST25DV64KC-DISCO interrupt generation display
The event types and the way to generate them are listed below:
• Field on: place a reader near the ST25DV-I2C tag
• Field off: move a reader away from the ST25DV-I2C tag
• EEPROM written: modify the content of the ST25DV-I2C tag
• RF interrupt: requires the use of a specific reader instruction, that is sent either by a smart phone running
the ST25 NFC app, or by a reader (see the instructions in Smart phone GPO management and Generating
the RF and RF user interrupts using the ST25PC-NFC software with the CR95HF sections, respectively, for
Android™ ST25 NFC application and for the CR95HF reader used with the ST25PC-NFC software)
• RF user: requires the use of a specific reader command, that is sent either by a smart phone running the
ST25 NFC app or by a reader (see the instructions in Smart phone GPO management and Generating the
RF and RF user interrupts using the ST25PC-NFC software with the CR95HF sections, respectively, for the
Android™ ST25 NFC application and for the CR95HF reader used with the ST25PC-NFC software)
To start the Android ST25 NFC application, read the ST25DV-I2C tag with a smart phone (after entering the GPO
demonstration), which automatically opens the required application (or propose the installation of the application).
The automatic application selection is done using an NDEF with an AAR.
Note: The mailbox events are also used to trigger the GPO interrupts. They are not mentioned here, as they would
require placing the ST25DV-I2C tag in the Mailbox mode.
Smart phone GPO management
The ST25 NFC application handles the RF interrupt and the RF user interrupt using register fields information
(see Figure 7). Do not forget to present the configuration password before any register change.
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Figure 7. Smart phone GPO register configuration
The ST25 NFC application generates the RF interrupt and the RF user interrupt using features located in the
Tools fragment in association with the RF GPO interrupt demonstration.
Generating the RF and RF user interrupts using the ST25PC-NFC software with the CR95HF
These interrupts are generated by any RF reader or Android™ smart phone.
Using the CR95HF IC and ST25PC-NFC software, the user is able to send interrupts or drive the GPO (see
Figure 8 and Figure 9)
• Select the ST25DV-I2C tag product
• Select "ENERGY HARVESTING" and GPO tab
• Click on "Send Interrupt Generated by GPO" to send an interrupt on GPO line
• Click on GPO set or GPO reset to be able to drive the GPO line.
For additional information about CR95HF PC software refer to the CR95HF development software user manual
(UM1084), available on www.st.com.
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Table of contents
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