Mikroelektronika MIKROE-724 データシート

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mikoBasic PRO for dsPIC30/33 and PIC24

MikroElektronika

mikroBasic PRO for dsPIC30/33 and PIC24 provides a library (driver) for working with the dsPIC33FJ and pic24HJ 

ECAN module.

ECAN is a very robust protocol that has error detection and signalling, self–checking and fault confinement. Faulty 

ECAN data and remote frames are re-transmitted automatically, similar to the Ethernet.

Data transfer rates depend on distance. For example, 1 Mbit/s can be achieved at network lengths below 40m while 

250 Kbit/s can be achieved at network lengths below 250m. The greater distance the lower maximum bitrate that can 

be achieved . The lowest bitrate defined by the standard is 200Kbit/s. Cables used are shielded twisted pairs. 

ECAN supports two message formats:

- Standard format, with 11 identifier bits, and 

- Extended format, with 29 identifier bits 

ECAN message format and DMA RAM buffer definiton can be found in the 

ECan_Defs.mbas

 header file located in the 

ECAN project folder. Read this file carefully and make appropriate adjustments for mcu in use. Also, if a new project 

is to be created this file has to be copied, adjusted and included into the project via include pragma directive with 

corresponding Search Path updating.

Important:

 

- ECAN buffers are located in DMA RAM, so two DMA channels are used for message transfer, one for each direction  

  (ECAN->DMA RAM, DMA RAM->ECAN). See the ECANxDmaChannelInit routine. 

- Consult CAN standard about CAN bus termination resistance. 

- CAN library routines require you to specify the module you want to use. To select the desired CAN module, simply  

  change the letter 

x in the routine prototype for a number from 1 to 2. 

- Number of CAN modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing  

  this library. 

Library Routines

 

- ECANxDmaChannelInit 

 

- ECANxSetOperationMode 

 

- ECANxGetOperationMode 

 

- ECANxInitialize 

 

- ECANxSelectTxBuffers 

 

- ECANxFilterDisable 

 

- ECANxFilterEnable 

 

- ECANxSetBufferSize 

 

- ECANxSetBaudRate 

 

- ECANxSetMask 

 

- ECANxSetFilter 

 

- ECANxRead 

 

- ECANxWrite