Low-Level

General Description

Functions
__STATIC_INLINE uint32_t	Cy_SCB_UART_Put (CySCB_Type *base, uint32_t data)
	Places a single data element in the UART TX FIFO. More...
__STATIC_INLINE uint32_t	Cy_SCB_UART_PutArray (CySCB_Type *base, void *buffer, uint32_t size)
	Places an array of data in the UART TX FIFO. More...
__STATIC_INLINE void	Cy_SCB_UART_PutArrayBlocking (CySCB_Type *base, void *buffer, uint32_t size)
	Places an array of data in the UART TX FIFO. More...
__STATIC_INLINE void	Cy_SCB_UART_PutString (CySCB_Type *base, char_t const string[])
	Places a NULL terminated string in the UART TX FIFO. More...
void	Cy_SCB_UART_SendBreakBlocking (CySCB_Type *base, uint32_t breakWidth)
	Sends a break condition (logic low) of specified width on UART TX line. More...
__STATIC_INLINE uint32_t	Cy_SCB_UART_Get (CySCB_Type const *base)
	Reads a single data element from the UART RX FIFO. More...
__STATIC_INLINE uint32_t	Cy_SCB_UART_GetArray (CySCB_Type const *base, void *buffer, uint32_t size)
	Reads an array of data out of the UART RX FIFO. More...
__STATIC_INLINE void	Cy_SCB_UART_GetArrayBlocking (CySCB_Type const *base, void *buffer, uint32_t size)
	Reads an array of data out of the UART RX FIFO. More...
__STATIC_INLINE uint32_t	Cy_SCB_UART_GetTxFifoStatus (CySCB_Type const *base)
	Returns the current status of the TX FIFO. More...
__STATIC_INLINE void	Cy_SCB_UART_ClearTxFifoStatus (CySCB_Type *base, uint32_t clearMask)
	Clears the selected statuses of the TX FIFO. More...
__STATIC_INLINE uint32_t	Cy_SCB_UART_GetRxFifoStatus (CySCB_Type const *base)
	Returns the current status of the RX FIFO. More...
__STATIC_INLINE void	Cy_SCB_UART_ClearRxFifoStatus (CySCB_Type *base, uint32_t clearMask)
	Clears the selected statuses of the RX FIFO. More...
__STATIC_INLINE uint32_t	Cy_SCB_UART_GetNumInTxFifo (CySCB_Type const *base)
	Returns the number of data elements in the UART TX FIFO. More...
__STATIC_INLINE bool	Cy_SCB_UART_IsTxComplete (CySCB_Type const *base)
	Checks whether the TX FIFO and Shifter are empty and there is no more data to send. More...
__STATIC_INLINE uint32_t	Cy_SCB_UART_GetNumInRxFifo (CySCB_Type const *base)
	Returns the number of data elements in the UART RX FIFO. More...
__STATIC_INLINE void	Cy_SCB_UART_ClearRxFifo (CySCB_Type *base)
	Clears all data out of the UART RX FIFO. More...
__STATIC_INLINE void	Cy_SCB_UART_ClearTxFifo (CySCB_Type *base)
	Clears all data out of the UART TX FIFO. More...

Function Documentation

Cy_SCB_UART_Put()

__STATIC_INLINE uint32_t Cy_SCB_UART_Put	(	CySCB_Type *	base,
		uint32_t	data
	)

Places a single data element in the UART TX FIFO.

This function does not block and returns how many data elements were placed in the TX FIFO.

Parameters

base	The pointer to the UART SCB instance.
data	Data to put in the TX FIFO. The element size is defined by the data type, which depends on the configured data width.

Returns

The number of data elements placed in the TX FIFO: 0 or 1.

Cy_SCB_UART_PutArray()

__STATIC_INLINE uint32_t Cy_SCB_UART_PutArray	(	CySCB_Type *	base,
		void *	buffer,
		uint32_t	size
	)

Places an array of data in the UART TX FIFO.

This function does not block. It returns how many data elements were placed in the TX FIFO.

Parameters

base	The pointer to the UART SCB instance.
buffer	The pointer to data to place in the TX FIFO. The element size is defined by the data type, which depends on the configured TX data width.
size	The number of data elements to TX.

Returns

The number of data elements placed in the TX FIFO.

Cy_SCB_UART_PutArrayBlocking()

__STATIC_INLINE void Cy_SCB_UART_PutArrayBlocking	(	CySCB_Type *	base,
		void *	buffer,
		uint32_t	size
	)

Places an array of data in the UART TX FIFO.

This function blocks until the number of data elements specified by the size is placed in the TX FIFO.

Parameters

base	The pointer to the UART SCB instance.
buffer	The pointer to data to place in the TX FIFO. The element size is defined by the data type, which depends on the configured data width.
size	The number of data elements to write into the TX FIFO.

Cy_SCB_UART_PutString()

__STATIC_INLINE void Cy_SCB_UART_PutString	(	CySCB_Type *	base,
		char_t const	string[]
	)

Places a NULL terminated string in the UART TX FIFO.

This function blocks until the entire string is placed in the TX FIFO.

Parameters

base	The pointer to the UART SCB instance.
string	The pointer to the null terminated string array.

Cy_SCB_UART_SendBreakBlocking()

void Cy_SCB_UART_SendBreakBlocking	(	CySCB_Type *	base,
		uint32_t	breakWidth
	)

Sends a break condition (logic low) of specified width on UART TX line.

Blocks until break is completed. Only call this function when UART TX FIFO and shifter are empty.

Parameters

base	The pointer to the UART SCB instance.
breakWidth	Width of break condition. Valid range is the TX data width (4 to 16 bits)

Note

Before sending break all UART TX interrupt sources are disabled. The state of UART TX interrupt sources is restored before function returns.

Side Effects

If this function is called while there is data in the TX FIFO or shifter that data will be shifted out in packets the size of breakWidth.

Cy_SCB_UART_Get()

__STATIC_INLINE uint32_t Cy_SCB_UART_Get

(

CySCB_Type const *

base

)

Reads a single data element from the UART RX FIFO.

This function does not check whether the RX FIFO has data before reading it. If the RX FIFO is empty, the function returns CY_SCB_UART_RX_NO_DATA.

Parameters

base	The pointer to the UART SCB instance.

Returns

Data from the RX FIFO. The data element size is defined by the configured data width.

Cy_SCB_UART_GetArray()

__STATIC_INLINE uint32_t Cy_SCB_UART_GetArray	(	CySCB_Type const *	base,
		void *	buffer,
		uint32_t	size
	)

Reads an array of data out of the UART RX FIFO.

This function does not block. It returns how many data elements were read from the RX FIFO.

Parameters

base	The pointer to the UART SCB instance.
buffer	The pointer to the location to place the data read from the RX FIFO. The element size is defined by the data type, which depends on the configured data width.
size	The number of data elements to read from the RX FIFO.

Returns

The number of data elements read from the RX FIFO.

Cy_SCB_UART_GetArrayBlocking()

__STATIC_INLINE void Cy_SCB_UART_GetArrayBlocking	(	CySCB_Type const *	base,
		void *	buffer,
		uint32_t	size
	)

Reads an array of data out of the UART RX FIFO.

This function blocks until the number of data elements specified by the size has been read from the RX FIFO.

Parameters

base	The pointer to the UART SCB instance.
buffer	The pointer to the location to place the data read from the RX FIFO. The element size is defined by the data type, which depends on the configured data width.
size	The number of data elements to read from the RX FIFO.

Cy_SCB_UART_GetTxFifoStatus()

__STATIC_INLINE uint32_t Cy_SCB_UART_GetTxFifoStatus

(

CySCB_Type const *

base

)

Returns the current status of the TX FIFO.

Parameters

base	The pointer to the UART SCB instance.

Returns

UART TX FIFO Statuses

Cy_SCB_UART_ClearTxFifoStatus()

__STATIC_INLINE void Cy_SCB_UART_ClearTxFifoStatus	(	CySCB_Type *	base,
		uint32_t	clearMask
	)

Clears the selected statuses of the TX FIFO.

Parameters

base	The pointer to the UART SCB instance.
clearMask	The mask whose statuses to clear. See UART TX FIFO Statuses for the set of constants.

Note

• The status is also used for interrupt generation, so clearing it also clears the interrupt sources.
• Level-sensitive statuses such as CY_SCB_UART_TX_TRIGGER, CY_SCB_UART_TX_EMPTY and CY_SCB_UART_TX_NOT_FULL are set high again after being cleared if the condition remains true.

Cy_SCB_UART_GetRxFifoStatus()

__STATIC_INLINE uint32_t Cy_SCB_UART_GetRxFifoStatus

(

CySCB_Type const *

base

)

Returns the current status of the RX FIFO.

Parameters

base	The pointer to the UART SCB instance.

Returns

UART RX FIFO status.

Cy_SCB_UART_ClearRxFifoStatus()

__STATIC_INLINE void Cy_SCB_UART_ClearRxFifoStatus	(	CySCB_Type *	base,
		uint32_t	clearMask
	)

Clears the selected statuses of the RX FIFO.

Parameters

base	The pointer to the UART SCB instance.
clearMask	The mask whose statuses to clear. See UART RX FIFO status. for the set of constants.

Note

• This status is also used for interrupt generation, so clearing it also clears the interrupt sources.
• Level-sensitive statuses such as CY_SCB_UART_RX_TRIGGER, CY_SCB_UART_RX_NOT_EMPTY and CY_SCB_UART_RX_FULL are set high again after being cleared if the condition remains true.

Cy_SCB_UART_GetNumInTxFifo()

__STATIC_INLINE uint32_t Cy_SCB_UART_GetNumInTxFifo

(

CySCB_Type const *

base

)

Returns the number of data elements in the UART TX FIFO.

Parameters

base	The pointer to the UART SCB instance.

Returns

The number of data elements in the TX FIFO. The size of date element defined by the configured data width.

Note

This number does not include any data currently in the TX shifter.

Cy_SCB_UART_IsTxComplete()

__STATIC_INLINE bool Cy_SCB_UART_IsTxComplete

(

CySCB_Type const *

base

)

Checks whether the TX FIFO and Shifter are empty and there is no more data to send.

Parameters

base	Pointer to the UART SCB instance.

Returns

If true, transmission complete. If false, transmission is not complete.

Cy_SCB_UART_GetNumInRxFifo()

__STATIC_INLINE uint32_t Cy_SCB_UART_GetNumInRxFifo

(

CySCB_Type const *

base

)

Returns the number of data elements in the UART RX FIFO.

Parameters

base	The pointer to the UART SCB instance.

Returns

The number of data elements in the RX FIFO. The size of date element defined by the configured data width.

Cy_SCB_UART_ClearRxFifo()

__STATIC_INLINE void Cy_SCB_UART_ClearRxFifo

(

CySCB_Type *

base

)

Clears all data out of the UART RX FIFO.

Parameters

base	The pointer to the UART SCB instance.

Side Effects

Any data currently in the shifter is cleared and lost.

Cy_SCB_UART_ClearTxFifo()

__STATIC_INLINE void Cy_SCB_UART_ClearTxFifo

(

CySCB_Type *

base

)

Clears all data out of the UART TX FIFO.

Parameters

base	The pointer to the UART SCB instance.

Side Effects

The TX FIFO clear operation also clears the shift register, so that the shifter could be cleared in the middle of a data element transfer, corrupting it. The data element corruption means that all bits that have not been transmitted are transmitted as 1s on the bus.