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AN247 Datasheet(PDF) 20 Page - Microchip Technology |
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AN247 Datasheet(HTML) 20 Page - Microchip Technology |
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20 / 32 page  AN247 DS00247A-page 20 2003 Microchip Technology Inc. movwf RXF1SIDL ; receive event movlw CAN_RXF0EIDH movwf RXF0EIDH movlw CAN_RXF0EIDL movwf RXF0EIDL movlw CAN_RXM0SIDH ; Set mask movwf RXM0SIDH movlw CAN_RXM0SIDL movwf RXM0SIDL movlw CAN_RXM0EIDH movwf RXM0EIDH movlw CAN_RXM0EIDL movwf RXM0EIDL movlw CAN_BRGCON1 ; Set bit rate movwf BRGCON1 movlw CAN_BRGCON2 movwf BRGCON2 movlw CAN_BRGCON3 movwf BRGCON3 movlw CAN_CIOCON ; Set IO movwf CIOCON clrf CANCON ; Enter Normal mode ; ***************************************************************************** ; ***************************************************************************** ; This routine is essentially a polling loop that waits for a ; receive event from RXB0 of the CAN module. When data is ; received, FSR0 is set to point to the TX or RX buffer depending ; upon whether the request was a 'put' or a 'get'. ; ***************************************************************************** _CANMain: bcf RXB0CON, RXFUL ; Clear the receive flag btfss RXB0CON, RXFUL ; Wait for a message bra $ - 2 clrwdt #ifdef ALLOW_GET_CMD btfss CAN_PG_BIT ; Put or get data? bra _CANMainJp1 lfsr 0, TXB0D0 ; Set pointer to the transmit buffer movlw 0x08 movwf _bootCount ; Setup the count to eight movwf WREG1 bra _CANMainJp2 #endif _CANMainJp1 lfsr 0, RXB0D0 ; Set pointer to the receive buffer movf RXB0DLC, W andlw 0x0F movwf _bootCount ; Store the count movwf WREG1 bz _CANMain ; Go back if no data specified for a put _CANMainJp2 ; ***************************************************************************** |
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