Motorola MC68328 Informações Técnicas descarregar pdf (Página 37)

Software Development

Porting FLEX One-Way Stack to the MC68328 MPU

FLEX Alphanumeric Chip MC68175 Interface 3-19

Send_4_bytes() supervises the interrupt process and will terminate after the transfer is

completed.

FLEXstack()

The FLEXstack function checks the circular packet queue for new data (by checking

gPackWrite and gPackRead indexes, as described in earlier section). If new data are in the

queue, it calls FStkPacketProcessing to process one packet.

A loop should wrap around FStkPacketProcessing to process all new information in the

circular queue.

Example 3-8 Function Send_4_bytes() Sample

void Send_4_bytes (void)

{

BCLR(gFlag1, XFERDONE_f1);

/* Select the FLEXchip IC to initiate the communication */

portj_dat = (UVAR8*) PJDATA;

*portj_dat &= ASSERT_SS;

/* Wait until the data transfer is complete */

while(!BTST(gFlag1, XFERDONE_f1));

}

Example 3-9 Function FStkPacketProcessing Sample

void FLEXstack()

{

while (gPackWrite != gPackRead)

FStkPacketProcessing(GetPacket());

}

Frees

cale Semiconductor,

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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