AN1105 datasheet(18/100 Pages) STMICROELECTRONICS

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ST7 pCAN PERIPHERAL DRIVER

Figure 11. Transmission IT Procedure

– In the event of a reception IT, after having found which buffer is involved, the driver performs

an optional software filtering, then notifies the application. If the cell received a remote frame,

the CAN_Remote_Reception_Notification function is called. Otherwise, if the cell received

data, the CAN_Request_Buffer function is called to request a buffer from your application.

After the buffer is filled, the driver calls the CAN_Data_Reception_Notification function to no-

tify you that the data is ready. If the DEBUG option is set, the CAN_Reception_Status func-

tion is called just before leaving the IT routine, which passes the status of the reception

processing procedure (Error, Success...) as a parameter. This is used to detect the causes

of any problems. See “Can_custom.h File” on page 24 for more information about notification

routines.

Figure 12. Reception IT Procedure

CAN Bus

Successful

Transmission

Notification

Error notification, only

if DEBUG defined

Fills buffer

with next data

Clears flags

Transmission attempt

What

see

Driver

Processing

you

Application

ST Driver

ST7 Hardware

CAN Bus

Successful

Reception

Notification:

Error notification

Only if DEBUG defined

Save data in software buffer

Buffer free for

What

see

Driver

Processing

reception

Data or Remote

Notification

(case data)

(case data) + clears flags

you

Application

ST Driver

ST7 Hardware

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