AN1105 datasheet(23/100 Pages) STMICROELECTRONICS

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ST7 pCAN PERIPHERAL DRIVER

CAN_Switch_Error CAN_Sleep (WakeUp_Cause):

CAN_Switch_Error CAN_Switch_On(Init_Data_Ptr,CAN_Bool):

CAN_Transmit_Error CAN_Transmit_Request(CAN_Buffer*):

Description

Puts the CAN node into Standby state.

This function aborts any pending transmissions and does not wait for the reception

buffers to be read. Then, it resets the driver in the same state as after power-on ini-

tialization.

If BUS_WAKEUP is selected, the next dominant bit detected on the bus will restart

the cell. If SOFT_WAKEUP is selected, the cell will not take the bus state into ac-

count. It can only be woken up by the CAN_Switch_On function.

Possible return value: CAN_SLEEP_SUCCESS or CAN_FATAL_ERROR (if the

RUN bit fails to reset after a time out or if the CAN_Clean function fails).

There is a time out mechanism implemented in this function (about 30ms), waiting for

the RUN bit to be actually reset. So if your application uses the watchdog REFRESH

IT BEFORE calling the function

Comments

Calls CAN_Clean (See Section 3.2.2 "Internal Routines".)

Input

Chip Wake-up function: BUS_WAKEUP or SOFT_WAKEUP

Output

Error status

Description

Puts the CAN node into Standby state.

Returns CAN_SLEEP_ERROR if a transmission request is pending, or if a hardware

reception buffer is still unsaved.

Possible return values:

CAN_SLEEP_ERROR if there are jobs pending in the hardware registers,

CAN_FATAL_ERROR if the RUN bit fails to reset after a time out,

or CAN_SLEEP_SUCCESS

Comments

This function will not reset the CAN node.

Input

Pointer on an Init_Data structure (See Section 2.1.5.1 "Data-type Variables"),

Boolean (CTRUE, CFALSE)

Output

Error status

Description

Puts the CAN node into Active state

The Boolean is used to transmit a dominant pulse (CTRUE) or not (CFALSE) upon

wake-up.

The bit timing and the mask/filter parameters can be reinitialized in this function. In

most cases, the cell will be initialized the same way as in the Power-on sequence.

So, you can re-use the first_init_data structure is declared in can.h.

Possible return values: SWITCH_ON_SUCCES and SWITCH_ON_FAILURE.

Comments

Calls CAN_Init (See Section 3.2.2 "Internal Routines").

Input

Pointer to the CAN message to be sent

Output

Error status

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