AN1105 datasheet(16/100 Pages) STMICROELECTRONICS

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ST7 pCAN PERIPHERAL DRIVER

functions defined in can_custom.c on certain events. The user only has to enter these func-

tions according to his needs before compiling the software.

2.1.3 Principle of Use

During compilation, the values of the hardware control registers are calculated by the preproc-

essor according to the compilation options selected in can_custom.h.

If the software filtering feature is enabled, the values of accepted identifiers have to be entered

by the user as a list in can_custom.h (See “Filtering” on page 29)

The functions in can.c are compiled or not, according to the selected

#define directives. (The

unwanted ones are simply left as comments).

Figure 10. Driver Customization System

During the first initialization (performed using the CAN_First_Init function), the peripheral’s

registers are written with the values defined at compilation time, the transmission FIFO is ini-

tialized and the cell starts (a wake up by bus can be chosen).

Then:

– The

CAN_Transmit_Request function initiates a transmission which begins with an in-queu-

ing of the message to be sent. Then, hardware buffer no.1 (the static transmission buffer) is

filled according to hardware requirements. (See Section 1.6.2 "Cell Behaviour").

#define INIT_BRPR 0x11

...

#define STATUS_CHANGE_NOTIFICATION

...

//#define DEBUG

#ifdef STATUS_CHANGE_NOTIFICATION

void CAN_Bus_Passive_Notification(void)

{

//To implement if defined

}

#endif

...

#ifdef DEBUG

void CAN_Overrun_Notification(void)

{

//To implement if defined

}

#endif

CAN_CUSTOM.H FILE

CAN_CUSTOM.C FILE

Compiled

Not Compiled

BRPR Register

0x11

Compilation

ST7 Registers

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