MikroElektronika PIC Microcontrollers PIC16 Instrukcja Użytkownika Pobierz pdf (Strona 125)

These constant values define flags related to reception of a CAN message. There

could be more than one this flag ANDed together to form multiple flags. If a par-

ticular bit is set; corresponding meaning is TRUE or else it will be FALSE.

e.g.

if (MsgFlag and CAN_RX_OVERFLOW) <> 0 then

' Receiver overflow has occurred.

' We have lost our previous message.

...

const CAN_RX_FILTER_BITS = $07

' Use these to access filter bits

const CAN_RX_FILTER_1 = $00

const CAN_RX_FILTER_2 = $01

const CAN_RX_FILTER_3 = $02

const CAN_RX_FILTER_4 = $03

const CAN_RX_FILTER_5 = $04

const CAN_RX_FILTER_6 = $05

const CAN_RX_OVERFLOW = $08

' Set if Overflowed else cleared

const CAN_RX_INVALID_MSG = $10

' Set if invalid else cleared

const CAN_RX_XTD_FRAME = $20

' Set if XTD message else cleared

const CAN_RX_RTR_FRAME = $40

' Set if RTR message else cleared

const CAN_RX_DBL_BUFFERED = $80

' Set if this message was

' hardware double-buffered

These constant values define mask codes. Routine CANSetMask() requires this

code as one of its arguments. These enumerations must be used by itself i.e. it can-

not be ANDed to form multiple values.

const CAN_MASK_B1 = 0

const CAN_MASK_B2 = 1

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