Mikroelektronika MIKROE-350 Fiche De Données

177

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

sub procedure CANSPISetBaudRate(dim SJW as byte, dim BRP as byte,
dim PHSEG1 

as byte, dim PHSEG2 as byte, dim PROPSEG as byte, dim

CAN_CONFIG_FLAGS as byte)

Nothing.

Sets the CANSPI module baud rate. Due to complexity of the CAN protocol,
you can not simply force a bps value. Instead, use this sub function when the
CANSPI module is in Config mode.

SAM, SEG2PHTS

and 

WAKFIL

bits are set according to 

CAN_CONFIG_FLAGS

value.

Refer to datasheet for details.

Parameters:

- 

SJW

as defined in CAN controller's datasheet 

- 

BRP

as defined in CAN controller's datasheet 

- 

PHSEG1

as defined in CAN controller's datasheet 

- 

PHSEG2

as defined in CAN controller's datasheet 

- 

PROPSEG

as defined in CAN controller's datasheet 

- 

CAN_CONFIG_FLAGS

is formed from predefined constants (see CANSPI constants) 

The CANSPI module must be in Config mode, otherwise the sub 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 required baud rate and sampling rules
dim can_config_flags as byte
...  
CANSPISetOperationMode(CANSPI_MODE_CONFIG, 0xFF)              '
set CONFIGURATION mode (CANSPI module mast be in config mode for
baud rate settings)
can_config_flags = CANSPI_CONFIG_SAMPLE_THRICE and

CANSPI_CONFIG_PHSEG2_PRG_ON and
CANSPI_CONFIG_STD_MSG       and
CANSPI_CONFIG_DBL_BUFFER_ON and
CANSPI_CONFIG_VALID_XTD_MSG and
CANSPI_CONFIG_LINE_FILTER_OFF

CANSPISetBaudRate(1, 1, 3, 3, 1, can_config_flags)