Host Application - Panasonic eUniStone Application Note Design Manual


The processor is chosen depending on criteria like,

Size, physical and memory

Performance

Power

Other peripheral functions
Other peripheral function can be measurement of physical parameters like temperature, humidity,
pressure, acceleration. Also input and output capabilities need to be considered like how keyboard,
display, LED's and input buttons should be handled, and it all depends on the functionality of the
complete accessory product.
The eUniStone provides the support to use a low cost minimal footprint host processor. A normal
implementation for a host running an eUniStone could be around;

Host application Flash: 4-8KB

Application (RAM): 4-8KB

Data buffering (RAM): 1-2KB
Of course the complete functionality decides the final requirements for the host processor in regard to
handle the eUniStone.
5.1.2

Host Application

The focus of this part is to provide information on how to control, initialize and configure eUniStone to
make the accessory working with major Smart Phones. To design the host application the commands
and responses in the SPP-AT specification [2] communication over UART interface are key. Also HW
aspects needs to be taken care of e.g. Low Power Mode and HW reset, the reference design and HW is
described in this document but also in the HW specification [1].
The below picture shows how a general state machine for the Host application may be implemented
and running in the host processor controlling the eUniStone module.
Application Note
Design Guide
24
PAN1322
Revision 1.2, 2013-12-18