AN1105 datasheet(83/100 Pages) STMICROELECTRONICS

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ST7 pCAN PERIPHERAL DRIVER

DESCRIPTION : Puts the CAN node into passive state. Returns an error if any

transmission request is pendingor if a hardware reception

buffer

is still unsaved. Dedicated to bus wake-up (for power save).

COMMENTS

: Doesn’t call CAN_Clean.

Possible return values : CAN_SLEEP_ERROR

CAN_SLEEP_FATAL

CAN_SLEEP_SUCCESS

--------------------------------------------------------------------------*/

CAN_Switch_Error CAN_Sleep (WakeUp_Cause wucause)

{

if (status_counter==0)

{

CANPSR=PAGE_2;

SetBit(CANBCSR,LOCK);

if (!ValBit(CANBCSR,LOCK))

{

return CAN_SLEEP_ERROR;

}

CANPSR=PAGE_3;

SetBit(CANBCSR,LOCK);

if (!ValBit(CANBCSR,LOCK))

{

CANPSR=PAGE_2;

Clr_LOCK_Bit();

return CAN_SLEEP_ERROR;

}

//Then the CAN cell can be shut down

ClrBit(CANCSR,RUN);

if (ValBit(CANCSR,RUN))

//Be careful there !!!!!

{

return CAN_SLEEP_FATAL;

}

CANPSR=PAGE_2;

Clr_LOCK_Bit();

CANPSR=PAGE_3;

Clr_LOCK_Bit();

if (wucause==BUS_WAKEUP)

//We are then in the case when the uC has to

be waken up by the bus

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