Mikroelektronika MIKROE-350 データシート

CANSPI_RX_MSG_FLAGS are flags related to reception of CAN message. If a par-
ticular bit is set then corresponding meaning is TRUE otherwise it will be FALSE.

const

CANSPI_RX_FILTER_BITS  

as byte = $07   ' Use this to access

filter bits

CANSPI_RX_FILTER_1     

as byte = $00

CANSPI_RX_FILTER_2     

as byte = $01

CANSPI_RX_FILTER_3     

as byte = $02

CANSPI_RX_FILTER_4     

as byte = $03

CANSPI_RX_FILTER_5     

as byte = $04

CANSPI_RX_FILTER_6     

as byte = $05

CANSPI_RX_OVERFLOW     

as byte = $08   ' Set if Overflowed

else cleared

CANSPI_RX_INVALID_MSG  

as byte = $10   ' Set if invalid

else cleared

CANSPI_RX_XTD_FRAME    

as byte = $20   ' Set if XTD mes-

sage else cleared

CANSPI_RX_RTR_FRAME    

as byte = $40   ' Set if RTR mes-

sage else cleared

CANSPI_RX_DBL_BUFFERED 

as byte = $80   ' Set if this mes-

sage was hardware double-buffered

You may use bitwise and to adjust the appropriate flags. For example:

if (MsgFlag and CANSPI_RX_OVERFLOW) <> 0 then

...
' Receiver overflow has occurred.
' We have lost our previous message.

The CANSPI_MASK constants define mask codes. Function CANSPISetMask
expects one of these as it's argument:

CANSPI_MASK_B1 

as byte = 0

CANSPI_MASK_B2 

as byte = 1

The CANSPI_FILTER constants define filter codes. Functions CANSPISetFilter
expects one of these as it's argument:

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- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6