Cirrus-logic AN74 Manual do Utilizador descarregar pdf (Página 8)

AN74

8 AN74Rev2

/*Reset Serial Port on CS5525/6/9*/

SDI = 0x01; /*Assert SDI*/

for(counter=0;counter<255;counter++) {

SCLK = 0x01; /*Assert SCLK*/

SCLK = 0x00; /*Deassert SCLK*/

}

SDI = 0x00; /*Deassert SDI PIN*/

SCLK = 0x01; /*Assert SCLK*/

SCLK = 0x00; /* Deassert SCLK*/

}

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

* Routine - calibrate

* Input - none

* Output - none

* This subroutine instructs the CS5525/6/9 to perform self-offset calibration.

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

void calibrate()

{ write_to_register(0x84,0x01,0x00,0x00); /*Assert RS bit*/

/*Read Configuration Register Until DF Bit is Asserted*/

do {

read_register(0x94); /*Read Configuration Register*/

temp = low_byte&0x08; /*Mask DF bit to 1*/

} while (temp != 0x08);

read_register(0x92); /*Deasserts DF Bit*/

}/*End calibrate */

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

* Routine - write_to_register

* Input - command, lowbyte, midbyte, highbyte

* Output - none

* This subroutine instructs the CS5525/6/9 to write to an internal register.

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

void write_to_register(char command,char low,char mid,char high){

if(mode == 1) P1 = 0xF4; /*Assert CS

if necessary*/

transfer_byte(command); /*Transfer Command Byte to CS5525/6/9*/

transfer_byte(high); /*Transfer High Byte to CS5525/6/9*/

transfer_byte(mid); /*Transfer Middle Byte to CS5525/6/9*/

transfer_byte(low); /*Transfer Low Byte to CS5525/6/9*/

if(mode == 1) P1 = 0xF5; /*Deassert CS

if necessary*/

}

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Cirrus-logic AN74 Manual do Utilizador Página 8

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