EasySync USB2-F-7101 Manual de usuario descargar pdf (Pagina 7)

Document Reference No.: ES_000010

USB2-F-7x01 Programming Guide

Version 1.01

Clearance No.: ES# 27

2.2.3 canplus_Open

Summary

Open a channel to the USB2-F-7x01.

Definition

CANHANDLE canplus_Open( LPCSTR szID, LPCSTR szBitrate, LPCSTR acceptance_code, LPCSTR

acceptance_mask, unsigned long flags );

Parameters

szID USB2-F-7x01 serial number

szBitrate 10 = 10Kbps

20 = 20Kbps

50 = 50Kbps

100 = 100Kbps

250 = 250Kbps

500 = 500Kbps

800 = 800Kbps

1000 = 1000Kbps

aabbcc = custom bit rate

aa = BRGCON1 register of Microchip PIC 18F2680

bb = BRGCON2 register of Microchip PIC 18F2680

cc = BRGCON3 register of Microchip PIC 18F2680

The USB2-F-7x01 utilizes a 24MHz clock for the PIC 18F2680. Use this

value when referring to the PIC datasheet if a custom transmission rate

different from the eight pre-defined rates is required.

acceptance_code 11-bit (0x000 to 0x7FF) or 29-bit (0x00000000 to 0x1FFFFFFF) code

used in filtering specific or ranges of CAN messages. Used in conjunction

with the acceptance mask. Note: When referring to the PIC datasheets,

Acceptance Code is synonymous with Acceptance Filter.

acceptance_mask 11-bit (0x000 to 0x7FF) or 29-bit (0x00000000 to 0x1FFFFFFF) code used

in filtering specific or ranges of CAN messages. Used in conjunction with

the acceptance code.

flags CANPLUS_FLAG_TIMESTAMP –

True = The timestamp function will be enabled by the USB2-F-7x01.

False = Timestamps will be determined by the device driver.

Remarks

If multiple USB2-F-7x01 adapters exist in a system, user must call canplus_getFirstAdapter and

canplus_getNextAdapter to get serial numbers of the connected adapters. The serial number

must be passed to canplus_Open in szID to open a specific device. If szID == NULL, the first

USB2-F-7x01 device will be opened.

Only one open command will be successful for a single device. At this point multiple channels to a

single physical device are not supported.

Any argument to this API may be set to NULL to use default value of the field. By default a CAN

channel is opened to accept all standard and extended CAN frames at 1Mbps bit rate.

Default timeouts for the underlying FTDI D2XX FT_Read and FT_Write are set to 1sec.

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