Motorola MC68328 Información técnica descargar pdf (Pagina 33)

Software Development

Porting FLEX One-Way Stack to the MC68328 MPU

FLEX Alphanumeric Chip MC68175 Interface 3-15

Example 3-4 Function FlexSPITransfer

/************************************************************************

* FUNCTION NAME: FlexSPITransfer() *

* Date created: 07/26/96 *

* *

* DESCRIPTIONS: *

* This function performs data communication via the *

* Serial Peripheral Interface (SPI). Given the Dragonball as *

* the 16-bit data bus microprocessor, two transmissions are *

* needed, with 16 bits of data for each transmission. *

* *

* INPUT: 32-bit of data to be sent to the FLEXchip IC *

* data1: Pointer to the first 16-bit data *

* data2: Pointer to the second 16-bit data *

* OUTPUT: data1 and data2 contain data received from the *

* FLEXchip IC. *

***********************************************************************/

void FlexSPITransfer(UVAR16 *data1, UVAR16 *data2)

{

*spmode &= XCH_MASK; /* Make sure no other transmission */

*spmode |= SPMEN_BIT; /* Enable SPI */

/* First 16-bit data transmission */

*spbd = *data1;

*spmode |= XCH_BIT;

waitForTransfer();

*data1 = *spbd; /* End of the first 16-bit transfer - data1

contains data from the FLEXchip IC */

/* Second 16-bit data transmission */

*spbd = *data2;

*spmode |= XCH_BIT;

waitForTransfer();

*data2 = *spbd; /* End of the second 16-bit transfer - data2

contains data from the FLEXchip IC */

return;

}

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cale Semiconductor,

Freescale Semiconductor, Inc.

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Motorola MC68328 Información técnica Pagina 33

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