AN1105 datasheet(51/100 Pages) STMICROELECTRONICS

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ST7 pCAN PERIPHERAL DRIVER

3.2.2.9 static CAN_Receive_Error CAN_Receive(u8 num_buff_hard)

Figure 26. CAN Receive Flowchart

INPUT

ID of the buffer to void, pointer on the software buffer to fill.

OUTPUT

Error status

DESCRIPTION

Fetches data received in a hardware buffer and saves them in a software buffer sup-

plied by the application

COMMENTS

ITs have to be disabled

Calls CAN_Filter (if SOFTWARE_FILTER option is enabled)

Calls CAN_Request_Buffer

Possible return values: CAN_FILTERING_FAILURE,.CAN_RECEIVE_REMOTE,

CAN_NO_BUFFER, CAN_RECEIVE_FATAL and CAN_RECEIVE_SUCCESS

Begin

FILTER_MATCH

if SOFTWARE_FILTERS defined

Remote frame?

Buffer exists?

Buffer already

accessed?

Buffer free?

status=success

Retrieves message identifier

CAN_Filter()

Releases hardware buffer

Calls

CAN_Remote_Reception_Notification()

Calls

CAN_FILTERING_FAILURE

Returns

CAN_Receive_Remote

Returns

CAN_NO_BUFFER

Returns

CAN_RECEIVE_FATAL

Releases hardware buffer

Calls

CAN_Request_Buffer()

Calls

CAN_Data_Reception_Notification()

Returns

CAN_RECEIVE_SUCCESS

CAN-Store_Received_Message

AN1105 Datasheet(PDF) 51 Page - STMicroelectronics

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