AN1105 datasheet(82/100 Pages) STMICROELECTRONICS

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ST7 pCAN PERIPHERAL DRIVER

{

CAN_Clean_Error clean_status;

CAN_It_Dis();

//Resets the CANICR register

ClrBit(CANCSR,RUN);

while (ValBit(CANCSR,RUN))

{

static u16 counter=0xFFF;

//Implement here a time out (171990 CPU cycles,

~21,4ms with 8MHz fcpu)

counter=counter-1;

if (counter==0)

{

return CAN_SLEEP_FATAL;

}

clean_status=CAN_Clean();

if (clean_status==CAN_CLEAN_FAILURE)

{

return CAN_SLEEP_FATAL;

}

if (wucause==BUS_WAKEUP)

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

waken up by the bus

{

Clr_SCIF_Bit();

//clears the CANISR TXIF flag, before reenabling ITs

SetBit(CANICR,SCIE);

//sets the CANICR TXIE flag, before reenabling ITs

}

else if(wucause==SOFT_WAKEUP)

{

Clr_SCIF_Bit();

//clears the CANISR TXIF flag, before reenabling ITs

}

status_counter=0;

return CAN_SLEEP_SUCCESS;

}

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

ROUTINE NAME : CAN_Sleep

INPUT/OUTPUT : way the chip can be waken up : BUS_WAKEUP or SOFT_WAKEUP/Error

status

AN1105 Datasheet(PDF) 82 Page - STMicroelectronics

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