Mikroelektronika MIKROE-742 데이터 시트

192

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

procedure CANSPISetMask(CAN_MASK: byte; val: longint; CAN_CON-
FIG_FLAGS: byte);

Nothing.

Configures mask for advanced filtering of messages. The parameter value is
bit-adjusted to the appropriate mask registers.

Parameters:

- 

CAN_MASK

: CANSPI module mask number. Valid values: 

CANSPI_MASK

constants (see CANSPI constants) 

- 

val

: mask register value 

- 

CAN_CONFIG_FLAGS

: selects type of message to filter. Valid values:    

CANSPI_CONFIG_ALL_VALID_MSG, 

CANSPI_CONFIG_MATCH_MSG_TYPE 

and CANSPI_CONFIG_STD_MSG,

CANSPI_CONFIG_MATCH_MSG_TYPE 

and CANSPI_CONFIG_XTD_MSG. 

(see CANSPI constants) 

The CANSPI module must be in Config mode, otherwise the function will be
ignored. See CANSPISetOperationMode.

The CANSPI routines are supported only by MCUs with the SPI module.

MCU has to be properly connected to mikroElektronika's CANSPI Extra Board
or similar hardware. See connection example at the bottom of this page.

// set the appropriate filter mask and message type value

CANSPISetOperationMode(CANSPI_MODE_CONFIG,0xFF);              //

set CONFIGURATION mode (CANSPI module must be in config mode for

mask settings)

// Set all B1 mask bits to 1 (all filtered bits are relevant):

// Note that -1 is just a cheaper way to write 0xFFFFFFFF.
// Complement will do the trick and fill it up with ones.

CANSPISetMask(CANSPI_MASK_B1, -1, CANSPI_CONFIG_MATCH_MSG_TYPE
and CANSPI_CONFIG_XTD_MSG);