70353C datasheet(36/76 Pages) MICROCHIP

36 / 76 page

dsPIC33E/PIC24E Family Reference Manual

DS70353C-page 21-36

Example 21-1:

Code Example for Standard Data Frame Transmission (Continued)

A code example to transmit an extended frame using Message Buffer 2 is shown in

Example 21-2.

/* Configure Message Buffer 0 for Transmission and assign priority */

C1TR01CONbits.TXEN0 = 0x1;

C1TR01CONbits.TX0PRI = 0x3;

/* At this point the ECAN1 module is ready to transmit a message. Place the ECAN module in

Normal mode. */

C1CTRL1bits.REQOP = 0;

while(C1CTRL1bits.OPMODE != 0);

/* Write to message buffer 0 */

/* CiTRBnSID = 0bxxx1 0010 0011 1100

IDE = 0b0

SRR = 0b0

SID<10:0>= 0b100 1000 1111 */

ecan1MsgBuf[0][0] = 0x123C;

/* CiTRBnEID = 0bxxxx 0000 0000 0000

EID<17:6> = 0b0000 0000 0000 */

ecan1MsgBuf[0][1] = 0x0000;

/* CiTRBnDLC = 0b0000 0000 xxx0 1111

EID<17:6> = 0b000000

RTR = 0b0

RB1 = 0b0

RB0 = 0b0

DLC = 0b1111 */

ecan1MsgBuf[0][2] = 0x0008;

/* Write message data bytes */

ecan1MsgBuf[0][3] = 0xabcd;

ecan1MsgBuf[0][4] = 0xabcd;

ecan1MsgBuf[0][5] = 0xabcd;

ecan1MsgBuf[0][6] = 0xabcd;

/* Request message buffer 0 transmission */

C1TR01CONbits.TXREQ0 = 0x1;

/* The following shows an example of how the TXREQ bit can be polled to check if transmission

is complete. */

while(C1TR01CONbits.TXREQ0 == 1);

/* Message was placed successfully on the bus */

while(1);

}

70353C Datasheet(PDF) 36 Page - Microchip Technology

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