AN91267 Datasheet, PDF (6/62 Pages) Ramtron International Corporation – Getting Started with PSoC

Getting Started with PSoC® 4 BLE
BLE Overview
BLE or Bluetooth Smart^TM is a low-power, short-range, low-data-rate wireless communication protocol that is defined by the
Bluetooth SIG. As shown in Figure 5, BLE has a layered protocol stack that is designed to efficiently transfer a small chunk of
data with low power consumption, making it the de facto wireless protocol for battery-operated devices.
The BLE stack consists of the following:
 ^{2.4-GHz RF physical layer (PHY) with a 1-Mbps data rate}
 ^{Link Layer (LL) that defines the timing and packet format for PHY}
 ^{Host Control Interface (HCI) that links the hardware controller (PHY + LL) layer with the firmware host layer of the stack}
 ^{Logical Link Control and Adaptation Protocol (L2CAP) that acts as a packet assembly/disassembly and protocol}
multiplexer layer
 ^{Attribute Protocol (ATT) that defines how the application data is organized and accessed}
 ^{Security Manager (SM) that provides a toolbox for secure data exchange over the BLE link}
 ^{Generic Attribute Profile (GATT) that defines methods to access data defined by the ATT layer.}
 ^{Generic Access Profile (GAP) that provides an application oriented interface which defines if the device acts as a BLE link}
master or slave and configures the underlying layers accordingly.
See Appendix E: BLE Protocol for a detailed description of the BLE protocol.
Figure 5. BLE Protocol Stack
Applications
...
Generic Access Profile (GAP)
Generic Attribute Profile (GATT)
Attribute Protocol (ATT)
Security Manager (SM) ^Host
Logical Link Control and Adaption Protocol (L2CAP)
Host Control Interface (HCI)
Link Layer (LL)
Controller
Physical Layer (PHY)
To develop an application using BLE, you do not need a working knowledge of this complex protocol stack. Cypress provides
an easy-to-configure, GUI-based BLE Component that abstracts the protocol complexity. To get started with BLE, it is
sufficient to understand:
 ^{BLE link establishment procedure}
 ^{Application data representation and abstraction}
 ^{Application requirements mapping to GAP and GATT layer configurations using Cypress’s BLE Component GUI.}
www.cypress.com
Document No. 001-91267 Rev. *D
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