AN247 datasheet(28/32 Pages) MICROCHIP

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AN247

DS00247A-page 28

 2003 Microchip Technology Inc.

; *****************************************************************************

; Function: VOID _CANSendAck()

;

VOID _CANSendResponce()

;

; PreCondition:TXB0 must be preloaded with the data.

; Input: None.

; Output: None.

; Side Effects: N/A.

; Stack Requirements: N/A

; Overview: These routines are technically not functions since they will not

;

return when called. They have been written in a linear form to

;

save space. Thus 'call' and 'return' instructions are not

;

included, but rather they are implied.

;

These routines are used for 'talking back' to the source. The

;

_CANSendAck routine sends an empty message to indicate

;

acknowledgement of a memory write operation. The

;

_CANSendResponce is used to send data back to the source.

;

; *****************************************************************************

#ifdef ALLOW_GET_CMD

_CANSendAck:

btfss

MODE_ACK

bra

_CANMain

clrf

TXB0DLC

; Setup for a 0 byte transmission

bra

_CANSendMessage

#endif

#ifdef ALLOW_GET_CMD

_CANSendResponce:

movlw

0x08

; Setup for 8 byte transmission

movwf

TXB0DLC

_CANSendMessage

btfsc

TXB0CON,TXREQ

; Wait for the buffer to empty

bra

$ - 2

movlw

CAN_TXB0SIDH

; Set ID

movwf

TXB0SIDH

movlw

CAN_TXB0SIDL

movwf

TXB0SIDL

movlw

CAN_TXB0EIDH

movwf

TXB0EIDH

movlw

CAN_TXB0EIDL

movwf

TXB0EIDL

bsf

CANTX_CD_BIT

; Setup the command bit

btfss

CAN_CD_BIT

bcf

CANTX_CD_BIT

bsf

TXB0CON, TXREQ

; Start the transmission

bra

_CANMain

#endif

; *****************************************************************************

END

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