Renesas Asynchronous SH7145F Instrukcja Użytkownika Pobierz pdf (Strona 17)

SH7145 Group

SCI Break Detection

REJ06B0384-0100Z/Rev.1.00 September 2004 Page 17 of 20

/* Initialize SCI asynchronous mode */

P_SCI0.SCR_0.BYTE &= 0x03 ; /* Clear TIE,RIE,TE,RE,MPIE,TEIE bit */

P_SCI0.SCR_0.BIT.CKE = 0; /* Clock:internal,SCK:output */

P_SCI0.SMR_0.BYTE = 0x00; /* 8bit,No parity,1stop bit */

// CA = 0; /* Asynchronous mode */

// CHR = 0; /* Data length 8 bits */

// PE = 0; /* Non-parity */

// OE = 0; /* (=0)even parity */

// STOP = 0; /* 1 stop bit */

// CKS = 0; /* Clock source = P phi(25MHz) */

P_SCI0.BRR_0 = 40; /* 19200bps@25MHz */

P_SCI0.SDCR_0.BIT.DIR = 0; /* LSB first */

for( i=0; i < 0x0400 ; i++); /* Wait 1 bit */

/* Initialize SCI0 PORT */

P_PORTA.PACRL2.BIT.PA0MD = 1; /* Set RXD0(PA1:130pin@SH7145) */

P_SCI0.SCR_0.BIT.RE = 1; /* RE=1,receive enable */

}

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

/* Function : rcv_sci */

/* Operation : Receive serial data(SCI0) */

/* Asynchronous Receive Mode */

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

unsigned char rcv_sci(unsigned char rev_count )

{

while(P_SCI0.SSR_0.BIT.RDRF == 0){ /* Wait until RDRF flag high level */

err(); /* Error judging */

/* Judging break detect */

if(P_SCI0.SCR_0.BIT.RE == 0) /* Break detect */

break;

}

Rev_data[rev_count] = P_SCI0.RDR_0; /* Store receive data */

P_SCI0.SSR_0.BIT.RDRF = 0; /* Clear RDRF flag */

rev_count++ ; /* Storing address increment */

return(rev_count);

}

Renesas Asynchronous SH7145F Instrukcja Użytkownika Strona 17