Figure 28.
ST25PC-NFC software NDEF interface
Clearing the EEPROM
This menu allows the user to clear the EEPROM content. The three choices are:
1.
Write an empty NDEF
2.
Erase the CC file (replace the first four bytes of memory with 0xFF)
3.
Clear EEPROM (fill the whole memory with 0xFF).
4.2.8
Fast transfer mode demonstration menu
This demonstration is intended to show how the ST25DV-I2C tag improves the data exchange between the
reader and the MCU using a proprietary protocol based on the ISO15693 standard as opposed to exchanging
data through the EEPROM. To perform the data exchange the ST25DV-I2C tag shares a 256-byte RAM buffer
available for the reader and the MCU (also called mailbox).
Data exchange is only carried out in one direction at a time (half duplex). The mailbox contains indicators giving
the reader status and generates pulses on a GPO, which must be connected to an external interrupt (GPIO input)
of the microcontroller. For more details on the mailbox feature, refer to the ST25DV-I2C tag datasheet.
When the user selects the Fast transfer mode icon (see
), a message displays "Starting Demo". During
this time, the firmware is initialized, enabling the mailbox functionality and erasing the Flash memory on the
MCU (to store data downloaded through NFC, dedicated demonstration Flash memory area). Then, when the
demonstration has finished its initialization, the message "Ready to start demo ! !" is displayed, as shown in
Note:
When the Mailbox feature is enabled, the EEPROM is in read only mode. To modify the EEPROM disable the
"Mailbox" feature.
UM2949
Main menu
UM2949
-
Rev 1
page 26/60
