Motorola MC68328 Informações Técnicas descarregar pdf (Página 26)

3-8 FLEX Alphanumeric Chip MC68175 Interface

Software Development

FLEX System Software

3.1.5 Receiving and Processing Paging Messages

FLEX One-Way Stack consists of interoperable modules that work together through a set

of external and intermodule APIs. The following four modules can be found in FLEX

One-Way Stack:

• FLEX Driver—Directly manages the FLEX Alphanumeric Chip IC and builds raw

message data from received data stream.

• FLEX Message Filter—Formats raw message data into character format, such as

ASCII, binary data, etc.

• FLEX Message Manager—Stores and manages completed messages.

• FLEX Application Interface—A lightweight wrapper of APIs that exposes a

high-level interface to host software.

Figure 3-4 Flow of Data through FLEX One-Way Stack

The flow of message data between software layers of FLEX One-Way Stack is

summarized in Figure 3-4. The process of receiving and processing paging messages

occurs in two stages.

In the first stage, the interrupt service routine receives raw data from the FLEX IC. Every

time the FLEX Alphanumeric Chip has data to send over to the host, it asserts an

interrupt to the host processor. The host acknowledges the interrupt with the interrupt

handler. The interrupt handler receives raw data from the FLEX Alphanumeric Chip via

SPI communication and stores the data in a circular queue as described in the following

paragraphs.

FLEX IC (Hardware Interface)

FLEX One-Way Stack

Driver Module

FLEX

Message Filter

Module

Manager Module

FLEX Message

FLEX Application Interface

Application Software

Raw Data

Codewords

Formatted

Messages

Codewords

(API Layer Can

Have Access to

Both Formatted

Messages or

Codewords)

AA1424

Frees

cale Semiconductor,

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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