/**
* @brief Enters the low power mode.
* @param CANx: where x can be 1 or 2 to to select the CAN peripheral.
* @retval status: CAN_Sleep_Ok if sleep entered, CAN_Sleep_Failed in an
* other case.
*/
uint8_t CAN_Sleep(CAN_TypeDef* CANx)
{
uint8_t sleepstatus = CAN_Sleep_Failed;
/* Check the parameters */
assert_param(IS_CAN_ALL_PERIPH(CANx));
/* Request Sleep mode */
CANx->MCR = (((CANx->MCR) & (uint32_t)(~(uint32_t)CAN_MCR_INRQ)) | CAN_MCR_SLEEP);
/* Sleep mode status */
if ((CANx->MSR & (CAN_MSR_SLAK|CAN_MSR_INAK)) == CAN_MSR_SLAK)
{
/* Sleep mode not entered */
sleepstatus = CAN_Sleep_Ok;
}
/* return sleep mode status */
return (uint8_t)sleepstatus;
}
/**
* @brief Wakes the CAN up.
* @param CANx: where x can be 1 or 2 to to select the CAN peripheral.
* @retval status: CAN_WakeUp_Ok if sleep mode left, CAN_WakeUp_Failed in an
* other case.
*/
uint8_t CAN_WakeUp(CAN_TypeDef* CANx)
{
uint32_t wait_slak = SLAK_TIMEOUT;
uint8_t wakeupstatus = CAN_WakeUp_Failed;
/* Check the parameters */
assert_param(IS_CAN_ALL_PERIPH(CANx));
/* Wake up request */
CANx->MCR &= ~(uint32_t)CAN_MCR_SLEEP;
/* Sleep mode status */
while(((CANx->MSR & CAN_MSR_SLAK) == CAN_MSR_SLAK)&&(wait_slak!=0x00))
{
wait_slak--;
}
if((CANx->MSR & CAN_MSR_SLAK) != CAN_MSR_SLAK)
{
/* wake up done : Sleep mode exited */
wakeupstatus = CAN_WakeUp_Ok;
}
/* return wakeup status */
return (uint8_t)wakeupstatus;
}
