HP EZ-KIT Uživatelský manuál stáhnout pdf (Strana 85)

Getting Started with ADSP-BF548 EZ-KIT Lite 6-1

6 USING ADSP-BF548 EZ-KIT

LITE KEYPAD AND LED

INDICATOR

In this chapter, we will use the ADSP-BF548 EZ-KIT Lite 4 x 4 matrix

keypad and six LED indicators. We will use a simple event-driven driver

to detect keypad presses and the system services library’s (SSL) flag service

to display each press’s row and column numbers on the LEDs. In addi-

tion, we will use the VisualDSP++ real-time kernel (VDK) to structure

our example program.

In this exercise, you will learn about the following concepts.

• Event-driven as opposed to data-driven SSL drivers

• SSL device drivers within the VDK device model

• VDK inter-thread message-passing

The chapter includes the following sections.

• “Event-Driven Device Drivers” on page 6-2

• “VDK Device Model” on page 6-3

• “VDK Message Passing” on page 6-4

• “Example 7: Creating a VDK Application” on page 6-4

• “Example 7: Source Files” on page 6-7

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HP EZ-KIT Uživatelský manuál Strana 85