Mikroelektronika MIKROE-742 데이터 시트

CANSPISetBaudRate

191

MIKROELEKTRONIKA

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

Libraries

mikroPASCAL PRO for AVR

CHAPTER 6

Prototype

procedure CANSPISetBaudRate(SJW: byte; BRP: byte; PHSEG1: byte;
PHSEG2: byte; PROPSEG: byte; CAN_CONFIG_FLAGS: byte);

Returns

Nothing.

Description

Sets the CANSPI module baud rate. Due to complexity of the CAN protocol,
you can not simply force a bps value. Instead, use this 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)

Requires

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.

Example

// set required baud rate and sampling rules
var can_config_flags: 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);