Cirrus-logic AN118 Manual do Utilizador descarregar pdf (Página 13)

AN118

AN118REV2 13

P3 = 0xFF; /*Use the alternative function of Port 3*/

EA = 0x00; /*Disable all interrupts*/

SCON = 0x72; /*8 bit UART*/

/*Set TI to enable TXSER UART function*/

/*Transmission Rate is 9600,N,8,1*/

TMOD = 0x20; /*Use TIMER1, 8-bit auto-reload */

TH1 = 0xFD; /*Initialize Auto-reload to FD for 11.059MHz external clock*/

PCON = 0x00; /*when set we run at 19200 Baud, 9600 when clear*/

TCON = 0X40; /*Turn internal UART timer on*/

for(j=0;j<2047;j++){ /*Delay 2048 SCLK cycles, ... */

SCLK = 0x01; /*to allow oscillator to start*/

SCLK = 0x00;

}

/*Reset Serial Port*/

SDI = 1; /*SET SDI PIN*/

for(j=0;j<254;j++) {

SCLK = 0x01; /*SET SCLK*/

SCLK = 0x00; /*CLR SCLK*/

}

SDI = 0; /*RESET SDI PIN*/

SCLK = 0x01; /*SET SCLK*/

SCLK = 0x00; /*CLR SCLK*/

mode = P0 & 0x01; /*Test Mode Pin*/

/*if Mode = 0, three wire mode ...*/

/*if Mode = 1, four wire mode. ...*/

/* NOTE: To change mode board must be Reset.*/

}

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

/* Routine - write_to_register */

/* Input - command, low, mid, high */

/* Output - none */

/* Description - This routine is used to write to any internal */

/* register. */

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

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

if(mode == 1) P1 = 0xF4; /* Clear CSb */

transfer_byte(command);

transfer_byte(high);

transfer_byte(mid);

transfer_byte(low);

if(mode == 1) P1 = 0xF5; /* Set CSb */

}

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Cirrus-logic AN118 Manual do Utilizador Página 13

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