AN1105 STMicroelectronics, AN1105 Datasheet - Page 16

• Manufacturer Part Number: AN1105
• Description: ST7 PCAN PERIPHERAL DRIVER
• Manufacturer: STMicroelectronics

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
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-
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CAN_CUSTOM.C FILE
#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
ing of the message to be sent. Then, hardware buffer no.1 (the static transmission buffer) is
filled according to hardware requirements. (See
CAN_CUSTOM.H FILE
#define INIT_BRPR 0x11
...
#define STATUS_CHANGE_NOTIFICATION
...
//#define DEBUG
Compilation
“Filtering” on page
Section 1.6.2 "Cell
Not Compiled
Compiled
29)
ST7 Registers
BRPR Register
0x11
Behaviour").
Compilation