/*******************************************************************************
* Function Name: Cy_WDT_Lock
****************************************************************************//**
*
* Locks out configuration changes to the Watchdog Timer register.
*
* After this function is called, the WDT configuration cannot be changed until
* Cy_WDT_Unlock() is called.
*
*******************************************************************************/
void Cy_WDT_Lock(void)
{
uint32_t interruptState;
interruptState = Cy_SysLib_EnterCriticalSection();
SRSS->WDT_CTL |= _VAL2FLD(SRSS_WDT_CTL_WDT_LOCK, CY_SRSS_WDT_LOCK_BITS);
Cy_SysLib_ExitCriticalSection(interruptState);
}
/*******************************************************************************
* Function Name: Cy_WDT_Unlock
****************************************************************************//**
*
* Unlocks the Watchdog Timer configuration register.
*
*******************************************************************************/
void Cy_WDT_Unlock(void)
{
uint32_t interruptState;
interruptState = Cy_SysLib_EnterCriticalSection();
/* The WDT lock is to be removed by two writes */
SRSS->WDT_CTL = ((SRSS->WDT_CTL & (uint32_t)(~SRSS_WDT_CTL_WDT_LOCK_Msk)) | CY_SRSS_WDT_LOCK_BIT0);
SRSS->WDT_CTL |= CY_SRSS_WDT_LOCK_BIT1;
Cy_SysLib_ExitCriticalSection(interruptState);
}
/*******************************************************************************
* Function Name: Cy_IPC_Sema_Set
****************************************************************************//**
*
* This function tries to acquire a semaphore. If the
* semaphore is not available, this function returns immediately with
* CY_IPC_SEMA_LOCKED.
*
* It first acquires the IPC channel that is used for all the semaphores, sets
* the semaphore if it is cleared, then releases the IPC channel used for the
* semaphore.
*
* \param semaNumber
* The semaphore number to acquire.
*
* \param preemptable
* When this parameter is enabled the function can be preempted by another
* task or other forms of context switching in an RTOS environment.
*
* \note
* If <b>preemptable</b> is enabled (true), the user must ensure that there are
* no deadlocks in the system, which can be caused by an interrupt that occurs
* after the IPC channel is locked. Unless the user is ready to handle IPC
* channel locks correctly at the application level, set <b>premptable</b> to
* false.
*
* \return Status of the operation
* \retval CY_IPC_SEMA_SUCCESS: The semaphore was set successfully
* \retval CY_IPC_SEMA_LOCKED: The semaphore channel is busy or locked
* by another process
* \retval CY_IPC_SEMA_NOT_ACQUIRED: Semaphore was already set
* \retval CY_IPC_SEMA_OUT_OF_RANGE: The semaphore number is not valid
*
* \funcusage
* \snippet IPC_sut_01.cydsn/main_cm4.c snippet_Cy_IPC_Sema_Set
*
*******************************************************************************/
cy_en_ipcsema_status_t Cy_IPC_Sema_Set(uint32_t semaNumber, bool preemptable)
{
uint32_t semaIndex;
uint32_t semaMask;
uint32_t interruptState = 0ul;
cy_stc_ipc_sema_t *semaStruct;
cy_en_ipcsema_status_t retStatus = CY_IPC_SEMA_LOCKED;
/* Get pointer to structure */
semaStruct = (cy_stc_ipc_sema_t *)Cy_IPC_Drv_ReadDataValue(cy_semaIpcStruct);
if (semaNumber < semaStruct->maxSema)
{
semaIndex = semaNumber / CY_IPC_SEMA_PER_WORD;
semaMask = (uint32_t)(1ul << (semaNumber - (semaIndex * CY_IPC_SEMA_PER_WORD) ));
if (!preemptable)
{
interruptState = Cy_SysLib_EnterCriticalSection();
}
/* Check to make sure the IPC channel is released
If so, check if specific channel can be locked. */
if(CY_IPC_DRV_SUCCESS == Cy_IPC_Drv_LockAcquire (cy_semaIpcStruct))
{
if((semaStruct->arrayPtr[semaIndex] & semaMask) == 0ul)
{
semaStruct->arrayPtr[semaIndex] |= semaMask;
retStatus = CY_IPC_SEMA_SUCCESS;
}
else
{
retStatus = CY_IPC_SEMA_NOT_ACQUIRED;
}
/* Release, but do not trigger a release event */
(void) Cy_IPC_Drv_LockRelease (cy_semaIpcStruct, CY_IPC_NO_NOTIFICATION);
}
if (!preemptable)
{
Cy_SysLib_ExitCriticalSection(interruptState);
}
}
else
{
retStatus = CY_IPC_SEMA_OUT_OF_RANGE;
}
return(retStatus);
}
/*******************************************************************************
* Function Name: Cy_SCB_EZI2C_GetActivity
****************************************************************************//**
*
* Returns a non-zero value if an I2C Read or Write cycle has occurred since the
* last time this function was called. All flags are reset to zero at the end of
* this function call, except the \ref CY_SCB_EZI2C_STATUS_BUSY.
*
* \param base
* The pointer to the EZI2C SCB instance.
*
* \param context
* The pointer to the context structure \ref cy_stc_scb_ezi2c_context_t
* allocated by the user. The structure is used during the EZI2C operation for
* internal configuration and data retention. The user must not modify anything
* in this structure.
*
* \return
* \ref group_scb_ezi2c_macros_get_activity.
*
*******************************************************************************/
uint32_t Cy_SCB_EZI2C_GetActivity(CySCB_Type const *base, cy_stc_scb_ezi2c_context_t *context)
{
uint32_t intrState;
uint32_t retStatus;
/* Suppress a compiler warning about unused variables */
(void) base;
intrState = Cy_SysLib_EnterCriticalSection();
retStatus = context->status;
context->status &= CY_SCB_EZI2C_STATUS_BUSY;
Cy_SysLib_ExitCriticalSection(intrState);
return (retStatus);
}
/*******************************************************************************
* Function Name: Cy_WDT_Init
****************************************************************************//**
*
* Initializes the Watchdog timer to its default state.
*
* The given default setting of the WDT:
* The WDT is unlocked and disabled.
* The WDT match value is 4096.
* None of ignore bits are set: the whole WDT counter bits are checked against
* the match value.
*
*******************************************************************************/
void Cy_WDT_Init(void)
{
uint32_t interruptState;
interruptState = Cy_SysLib_EnterCriticalSection();
/* Unlock the WDT by two writes */
SRSS->WDT_CTL = ((SRSS->WDT_CTL & (uint32_t)(~SRSS_WDT_CTL_WDT_LOCK_Msk)) | CY_SRSS_WDT_LOCK_BIT0);
SRSS->WDT_CTL |= CY_SRSS_WDT_LOCK_BIT1;
Cy_WDT_Disable();
Cy_WDT_SetMatch(CY_SRSS_WDT_DEFAULT_MATCH_VALUE);
Cy_WDT_SetIgnoreBits(CY_SRSS_WDT_DEFAULT_IGNORE_BITS);
Cy_SysLib_ExitCriticalSection(interruptState);
}
