AN1105 datasheet(24/100 Pages) STMICROELECTRONICS

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ST7 pCAN PERIPHERAL DRIVER

2.1.5.3 Constants

Those constants are defined internally, but are made visible to the user because they may be

useful.

extern const Init_Data first_init_data

This is the initialization data structure that is used on power-on. It is made visible to allow you

to pass it to the CAN_Switch_On function when you do not want to modify the parameters it

contains. (See Section 2.1.5.1 "Data-type Variables")

extern const u16 i_filters[];

This is the array of filters used to perform software filtering on incoming messages. The max-

imum number of identifiers stored is 127 (See “Filtering” on page 29). It is made visible in case

you would like to link the behaviour of your application upon reception of a message with the

offset of the identifier in the array (managing an array of pointers to functions for example).

One can of course imagine other applications.

2.1.5.4 Can_custom.h File

The preprocessor directives used to configure the hardware and to customize the driver are

located in this file.

Cell Configuration Values

#define INIT_BRPR

0x00

#define INIT_BTR

0x00

These values are used to initialize bit timing registers. (See Section 2.2.2.1 "Bit Timing").

/*Masks & filters*/

#define INIT_FHR0

0x00

Description

Puts a buffer into the transmission queue, and may request an immediate transmis-

sion if the queue is empty.

The buffer_rw field has to be CFALSE before passing it to the function. It is immedi-

ately marked as CTRUE after entering the routine. In case of an error, during the ex-

ecution, this parameter is reset to CFALSE before exiting. Else it is only reset by

CAN_Fill_Transmission_Buffer (See Section 3.2.2 "Internal Routines").

Possible return values:

CAN_TRANSMIT_FAILURE if the cell is in stand-by,

CAN_FIFO_FULL if the 3 messages deep FIFO is full,

CAN_TRANSMIT_FATAL if CAN_Fill_Transmission_Buffer fails,

or CAN_TRANSMIT_SUCCESS otherwise.

Comments

This function MUST NOT be interrupted, so protect it with SIM and RIM statements

when used OUTSIDE the notification functions of CAN_custom.c!

Calls CAN_Init_Queue and CAN_Fill_Transmission_Buffer (See Section 3.2.2 "Inter-

nal Routines")

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