Detailed Description

UARTDRV Universal Asynchronous Receiver/Transmitter Driver.

The source files for the UART driver library resides in the emdrv/uartdrv folder, and are named uartdrv.c and uartdrv.h.

Introduction

The UART driver support the UART capabilities of the USART, UART and LEUART peripherals. The driver is fully reentrant and multiple driver instances can coexist. The driver does not buffer or queue data, but it queues UART transmit and receive operations. Both blocking and non-blocking transfer functions are available. Non-blocking transfer functions report transfer completion with callback functions. Transfers are done using DMA. Simple direct/forced transmit and receive functions are also available. Note that these functions are blocking and not suitable for low energy applications as they use CPU polling.

UART hardware flow control (CTS/RTS) is fully supported by the driver. UART software flow control (XON/XOFF) is partially supported by the driver. Read more about flow control support in Flow Control Support.

Note: Transfer completion callback functions are called from within the DMA interrupt handler with interrupts disabled.

Configuration Options

Some properties of the UARTDRV driver are compile-time configurable. These properties are set in a file named uartdrv_config.h. A template for this file, containing default values, resides in the emdrv/config folder. To configure UARTDRV for your application, provide your own configuration file, or override the defines on the compiler command line. These are the available configuration parameters with default values defined.

// Size of the receive operation queue
#define EMDRV_UARTDRV_MAX_CONCURRENT_RX_BUFS    6
// Size of the transmit operation queue
#define EMDRV_UARTDRV_MAX_CONCURRENT_TX_BUFS    6
// Set to 1 to enable hardware flow control
#define EMDRV_UARTDRV_FLOW_CONTROL_ENABLE       1
// Maximum number of driver instances.
// This maximum applies only when EMDRV_UARTDRV_FLOW_CONTROL_ENABLE = 1
#define EMDRV_UARTDRV_MAX_DRIVER_INSTANCES      4
// UART software flow control code: request peer to start TX
#define UARTDRV_FC_SW_XON                       0x11
// UART software flow control code: request peer to stop TX
#define UARTDRV_FC_SW_XOFF                      0x13

The properties of each UART driver instance are set at run-time via the UARTDRV_InitUart_t data structure input parameter to the UARTDRV_InitUart() function for UART and USART peripherals, and the UARTDRV_InitLeuart_t data structure input parameter to the UARTDRV_InitLeuart() function for LEUART peripherals.

The API

This section contain brief descriptions of the functions in the API. You will find detailed information on input and output parameters and return values by clicking on the hyperlinked function names. Most functions return an error code, ECODE_EMDRV_UARTDRV_OK is returned on success, see ecode.h and uartdrv.h for other error codes.

Your application code must include one header file: uartdrv.h.

UARTDRV_InitUart(), UARTDRV_InitLeuart() and UARTDRV_DeInit()
These functions initialize and deinitialize the UARTDRV driver. Typically UARTDRV_InitUart() (for UART/USART) or UARTDRV_InitLeuart() (for LEUART) are called once in your startup code.

UARTDRV_GetReceiveStatus() and UARTDRV_GetTransmitStatus()
Query the status of a current transmit or receive operations. Reports number of items (frames) transmitted and remaining.

UARTDRV_GetReceiveDepth() and UARTDRV_GetTransmitDepth()
Get the number of queued receive or transmit operations.

UARTDRV_Transmit(), UARTDRV_Receive()
UARTDRV_TransmitB(), UARTDRV_ReceiveB()
UARTDRV_ForceTransmit() and UARTDRV_ForceReceive()
Transfer functions come in both blocking and non-blocking versions, the blocking versions have an uppercase B (for Blocking) at the end of their function name. Blocking functions will not return before the transfer has completed. The non-blocking functions signal transfer completion with a callback function. UARTDRV_ForceTransmit() and UARTDRV_ForceReceive() are also blocking. These two functions access the UART peripheral directly without using DMA or interrupts. UARTDRV_ForceTransmit() does not respect flow control. UARTDRV_ForceReceive() forces RTS low.

UARTDRV_Abort()
Abort current transmit or receive operations, and remove all queued operations.

UARTDRV_FlowControlSet(), UARTDRV_FlowControlGetSelfStatus(), UARTDRV_FlowControlSetPeerStatus() and UARTDRV_FlowControlGetPeerStatus()
Set and get flow control status of self or peer device. Note that the return value from these two functions depends on the flow control mode set by UARTDRV_FlowControlSet(), UARTDRV_InitUart() or UARTDRV_InitLeuart().

UARTDRV_FlowControlIgnoreRestrain()
Enables transmission when restrained by flow control.

UARTDRV_PauseTransmit() and UARTDRV_ResumeTransmit()
Pause a currently active transmit operation by preventing the DMA from loading the UART fifo. Will not override HW flow control state (if applicable), but can be used in conjunction.

Flow Control Support

If UART flow control is not required, make sure EMDRV_UARTDRV_FLOW_CONTROL_ENABLE is set to 0. This reduces the code size and complexity of the driver.

There are two types of flow control supported, hardware and software. To enable any of these, set EMDRV_UARTDRV_FLOW_CONTROL_ENABLE to 1 in uartdrv_config.h.

Hardware Flow Control

UART hardware flow control uses two additional pins for flow control handshaking, the clear-to-send (CTS) and ready-to-send (RTS) pins. RTS is an output and CTS is an input. These are active low signals. When CTS is high, the UART transmitter should stop sending frames. A receiver should set RTS high when it is no longer capable of receiving data.

Peripheral Hardware Flow Control

Newer devices, such as EFR32MG1 and EFM32PG1, natively support CTS/RTS in the USART peripheral hardware. To enable hardware flow control, perform the following steps:

Set EMDRV_UARTDRV_FLOW_CONTROL_ENABLE to 1.
In the UARTDRV_InitUart_t struct passed to UARTDRV_InitUart(), set UARTDRV_InitUart_t::fcType = uartdrvFlowControlHwUart.
Define the pins for CTS and RTS by setting ctsPort, ctsPin, rtsPort and rtsPin in the init struct.
Also define the CTS and RTS locations by setting portLocationCts and portLocationRts in the init struct.

GPIO Hardware Flow Control

To support hardware flow control on devices that don't have UART CTS/RTS hardware support, the driver includes the GPIOINT driver to emulate a hardware implementation of UART CTS/RTS flow control on these devices.

To enable hardware flow control, perform the following steps:

Set EMDRV_UARTDRV_FLOW_CONTROL_ENABLE to 1.
UART/USART: In the UARTDRV_InitUart_t struct passed to UARTDRV_InitUart(), set UARTDRV_InitUart_t::fcType = uartdrvFlowControlHw.
LEUART: In the UARTDRV_InitLeuart_t struct passed to UARTDRV_InitLeuart(), set UARTDRV_InitLeuart_t::fcType = uartdrvFlowControlHw.
Define the pins for CTS and RTS by setting ctsPort, ctsPin, rtsPort and rtsPin in the same init struct.

Note: Because of the limitations in GPIO interrupt hardware, you cannot select CTS pins in multiple driver instances with the same pin number. Ie. pin A0 and B0 cannot serve as CTS pins in two concurrent driver instances.

RTS is set high whenever there are no RX operations queued. The UART transmitter is halted when the CTS pin goes high. The transmitter completes the current frame before halting. DMA transfers are also halted.

Software Flow Control

UART software flow control uses in-band signaling, meaning the receiver sends special flow control characters to the transmitter and thereby removes the need for dedicated wires for flow control. The two symbols UARTDRV_FC_SW_XON and UARTDRV_FC_SW_XOFF are defined in uartdrv_config.h.

To enable support for software flow control, perform the following steps:

Set EMDRV_UARTDRV_FLOW_CONTROL_ENABLE to 1.
UART/USART: In the UARTDRV_InitUart_t struct passed to UARTDRV_InitUart(), set UARTDRV_InitUart_t::fcType = uartdrvFlowControlSw.
LEUART: In the UARTDRV_InitLeuart_t struct passed to UARTDRV_InitLeuart(), set UARTDRV_InitLeuart_t::fcType = uartdrvFlowControlSw.

Note: Software flow control is partial only.

The application must monitor buffers and make decisions on when to send XON/ XOFF. XON/XOFF can be sent to the peer using UARTDRV_FlowControlSet(). Though UARTDRV_FlowControlSet() will pause the active transmit operation to send a flow control character, there is no way to guarantee the order. If the application implements a specific packet format where the flow control codes may appear only in fixed positions, then the application should not use UARTDRV_FlowControlSet(), but implement read and write of XON/XOFF into packet buffers. If the application code fully implements all the flow control logic, then EMDRV_UARTDRV_FLOW_CONTROL_ENABLE should be set to 0 to reduce code space.

Example

#include "uartdrv.h"
// Define receive/transmit operation queues
DEFINE_BUF_QUEUE(EMDRV_UARTDRV_MAX_CONCURRENT_RX_BUFS, rxBufferQueue);
DEFINE_BUF_QUEUE(EMDRV_UARTDRV_MAX_CONCURRENT_TX_BUFS, txBufferQueue);
// Configuration for USART1, location 1
#define MY_UART                                     \
{                                                   \
  USART1,                                           \
  115200,                                           \
  _USART_ROUTE_LOCATION_LOC1,                       \
  usartStopbits1,                                   \
  usartNoParity,                                    \
  usartOVS16,                                       \
  uartdrvFlowControlHw,                             \
  gpioPortD,                                        \
  2,                                                \
  gpioPortD,                                        \
  3,                                                \
  (UARTDRV_Buffer_FifoQueue_t *)&rxBufferQueue,     \
  (UARTDRV_Buffer_FifoQueue_t *)&txBufferQueue      \
}
UARTDRV_HandleData_t handleData;
UARTDRV_Handle_t handle = &handleData;
uint8_t buffer[64];
void callback(UARTDRV_Handle_t handle,
              Ecode_t transferStatus,
              uint8_t *data,
              UARTDRV_Count_t transferCount)
{
  (void)handle;
  (void)transferStatus;
  (void)data;
  (void)transferCount;
}
void uartdrv_example(void)
{
  // Initialize driver handle
  UARTDRV_InitUart_t initData = MY_UART;
  UARTDRV_InitUart(handle, &initData);
  // Transmit data using a non-blocking transmit function
  UARTDRV_Transmit(handle, buffer, 64, callback);
}

Data Structures
struct	UARTDRV_Buffer_FifoQueue_t
	Transfer operation FIFO queue typedef. More...

struct	UARTDRV_Buffer_t
	UART transfer buffer. More...

struct	UARTDRV_HandleData

struct	UARTDRV_InitLeuart_t

struct	UARTDRV_InitUart_t

Macros
#define	DEFINE_BUF_QUEUE(qSize, qName)

#define	ECODE_EMDRV_UARTDRV_ABORTED (ECODE_EMDRV_UARTDRV_BASE \| 0x00000009)
	UART transfer has been aborted.

#define	ECODE_EMDRV_UARTDRV_BUSY (ECODE_EMDRV_UARTDRV_BASE \| 0x00000004)
	The UART port is busy.

#define	ECODE_EMDRV_UARTDRV_CLOCK_ERROR (ECODE_EMDRV_UARTDRV_BASE \| 0x0000000F)
	Unable to set desired baudrate.

#define	ECODE_EMDRV_UARTDRV_DMA_ALLOC_ERROR (ECODE_EMDRV_UARTDRV_BASE \| 0x0000000E)
	Unable to allocated DMA channels.

#define	ECODE_EMDRV_UARTDRV_FRAME_ERROR (ECODE_EMDRV_UARTDRV_BASE \| 0x0000000D)
	UART frame error. Data is ignored.

#define	ECODE_EMDRV_UARTDRV_IDLE (ECODE_EMDRV_UARTDRV_BASE \| 0x00000008)
	No UART transfer in progress.

#define	ECODE_EMDRV_UARTDRV_ILLEGAL_HANDLE (ECODE_EMDRV_UARTDRV_BASE \| 0x00000002)
	Illegal UART handle.

#define	ECODE_EMDRV_UARTDRV_ILLEGAL_OPERATION (ECODE_EMDRV_UARTDRV_BASE \| 0x00000005)
	Illegal operation on UART port.

#define	ECODE_EMDRV_UARTDRV_OK (ECODE_OK)
	Success return value.

#define	ECODE_EMDRV_UARTDRV_PARAM_ERROR (ECODE_EMDRV_UARTDRV_BASE \| 0x00000003)
	Illegal input parameter.

#define	ECODE_EMDRV_UARTDRV_PARITY_ERROR (ECODE_EMDRV_UARTDRV_BASE \| 0x0000000C)
	UART parity error frame. Data is ignored.

#define	ECODE_EMDRV_UARTDRV_QUEUE_EMPTY (ECODE_EMDRV_UARTDRV_BASE \| 0x0000000B)
	UART operation queue is empty.

#define	ECODE_EMDRV_UARTDRV_QUEUE_FULL (ECODE_EMDRV_UARTDRV_BASE \| 0x0000000A)
	UART operation queue is full.

#define	ECODE_EMDRV_UARTDRV_WAITING (ECODE_EMDRV_UARTDRV_BASE \| 0x00000001)
	Operation is waiting in queue.

#define	UARTDRV_STATUS_RXBLOCK (1 << 3)
	Receiver is blocked; incoming frames will be discarded.

#define	UARTDRV_STATUS_RXDATAV (1 << 7)
	Data is available in receive buffer.

#define	UARTDRV_STATUS_RXEN (1 << 0)
	Receiver is enabled.

#define	UARTDRV_STATUS_RXFULL (1 << 8)
	Receive buffer is full.

#define	UARTDRV_STATUS_TXBL (1 << 6)
	Transmit buffer is empty.

#define	UARTDRV_STATUS_TXC (1 << 5)
	Transmit operation is complete, no more data is available in the transmit buffer and shift register.

#define	UARTDRV_STATUS_TXEN (1 << 1)
	Transmitter is enabled.

#define	UARTDRV_STATUS_TXIDLE (1 << 13)
	Transmitter is idle.

#define	UARTDRV_STATUS_TXTRI (1 << 4)
	Transmitter is tristated.

Typedefs
typedef enum UARTDRV_AbortType	UARTDRV_AbortType_t
	Transfer abort type.

typedef void(*	UARTDRV_Callback_t) (struct UARTDRV_HandleData handle, Ecode_t transferStatus, uint8_t data, UARTDRV_Count_t transferCount)
	UARTDRV transfer completion callback function. More...

typedef uint32_t	UARTDRV_Count_t
	UART transfer count.

typedef enum UARTDRV_FlowControlState	UARTDRV_FlowControlState_t
	Flow Control state.

typedef enum UARTDRV_FlowControlType	UARTDRV_FlowControlType_t
	Flow Control method.

typedef UARTDRV_HandleData_t *	UARTDRV_Handle_t
	Handle pointer.

typedef struct UARTDRV_HandleData	UARTDRV_HandleData_t

typedef uint32_t	UARTDRV_Status_t
	UART status return type. Bitfield of UARTDRV_STATUS_* values.

Enumerations
enum	UARTDRV_AbortType { uartdrvAbortTransmit = 1, uartdrvAbortReceive = 2, uartdrvAbortAll = 3 }
	Transfer abort type. More...

enum	UARTDRV_FlowControlState { uartdrvFlowControlOn = 0, uartdrvFlowControlOff = 1, uartdrvFlowControlAuto = 2 }
	Flow Control state. More...

enum	UARTDRV_FlowControlType { uartdrvFlowControlNone = 0, uartdrvFlowControlSw = 1, uartdrvFlowControlHw = 2, uartdrvFlowControlHwUart = 3 }
	Flow Control method. More...

Functions
Ecode_t	UARTDRV_Abort (UARTDRV_Handle_t handle, UARTDRV_AbortType_t type)
	Abort ongoing UART transfers. More...

Ecode_t	UARTDRV_DeInit (UARTDRV_Handle_t handle)
	Deinitialize a UART driver instance. More...

UARTDRV_FlowControlState_t	UARTDRV_FlowControlGetPeerStatus (UARTDRV_Handle_t handle)
	Checks the peer's flow control status. More...

UARTDRV_FlowControlState_t	UARTDRV_FlowControlGetSelfStatus (UARTDRV_Handle_t handle)
	Checks the self's flow control status. More...

Ecode_t	UARTDRV_FlowControlIgnoreRestrain (UARTDRV_Handle_t handle)
	Enables transmission when restrained by flow control. More...

Ecode_t	UARTDRV_FlowControlSet (UARTDRV_Handle_t handle, UARTDRV_FlowControlState_t state)
	Set UART flow control state. Set nRTS pin if hardware flow control is enabled. Send XON/XOFF if software flow control is enabled. More...

Ecode_t	UARTDRV_FlowControlSetPeerStatus (UARTDRV_Handle_t handle, UARTDRV_FlowControlState_t state)
	Set peer UART flow control state. Pause/resume transmit accordingly. Only for manual software flow control. More...

UARTDRV_Count_t	UARTDRV_ForceReceive (UARTDRV_Handle_t handle, uint8_t *data, UARTDRV_Count_t maxLength)
	Direct receive without interrupts or callback. Blocking function. More...

Ecode_t	UARTDRV_ForceTransmit (UARTDRV_Handle_t handle, uint8_t *data, UARTDRV_Count_t count)
	Direct transmit without interrupts or callback. Blocking function that ignores flow control if enabled. More...

UARTDRV_Status_t	UARTDRV_GetPeripheralStatus (UARTDRV_Handle_t handle)
	Returns the status of the UART peripheral associated with a given handle. More...

uint8_t	UARTDRV_GetReceiveDepth (UARTDRV_Handle_t handle)
	Returns the number of queued receive operations. More...

UARTDRV_Status_t	UARTDRV_GetReceiveStatus (UARTDRV_Handle_t handle, uint8_t *buffer, UARTDRV_Count_t bytesReceived, UARTDRV_Count_t *bytesRemaining)
	Check the status of the UART and gather information about any ongoing receive operations. More...

uint8_t	UARTDRV_GetTransmitDepth (UARTDRV_Handle_t handle)
	Returns the number of queued transmit operations. More...

UARTDRV_Status_t	UARTDRV_GetTransmitStatus (UARTDRV_Handle_t handle, uint8_t *buffer, UARTDRV_Count_t bytesSent, UARTDRV_Count_t *bytesRemaining)
	Check the status of the UART and gather information about any ongoing transmit operations. More...

__STATIC_INLINE Ecode_t	UARTDRV_Init (UARTDRV_Handle_t handle, UARTDRV_InitUart_t *initData)
	Initialize a U(S)ART driver instance. More...

Ecode_t	UARTDRV_InitLeuart (UARTDRV_Handle_t handle, const UARTDRV_InitLeuart_t *initData)
	Initialize a LEUART driver instance. More...

Ecode_t	UARTDRV_InitUart (UARTDRV_Handle_t handle, const UARTDRV_InitUart_t *initData)
	Initialize a U(S)ART driver instance. More...

Ecode_t	UARTDRV_PauseTransmit (UARTDRV_Handle_t handle)
	Pause an ongoing transmit operation. More...

Ecode_t	UARTDRV_Receive (UARTDRV_Handle_t handle, uint8_t *data, UARTDRV_Count_t count, UARTDRV_Callback_t callback)
	Start a non-blocking receive. More...

Ecode_t	UARTDRV_ReceiveB (UARTDRV_Handle_t handle, uint8_t *data, UARTDRV_Count_t count)
	Start a blocking receive. More...

Ecode_t	UARTDRV_ResumeTransmit (UARTDRV_Handle_t handle)
	Resume a paused transmit operation. More...

Ecode_t	UARTDRV_Transmit (UARTDRV_Handle_t handle, uint8_t *data, UARTDRV_Count_t count, UARTDRV_Callback_t callback)
	Start a non-blocking transmit. More...

Ecode_t	UARTDRV_TransmitB (UARTDRV_Handle_t handle, uint8_t *data, UARTDRV_Count_t count)
	Start a blocking transmit. More...

Macro Definition Documentation

#define DEFINE_BUF_QUEUE	(	qSize,
		qName
	)

Value:

typedef struct {                        \
  uint16_t head;                        \
  uint16_t tail;                        \
  volatile uint16_t used;               \
  const uint16_t size;                  \
  UARTDRV_Buffer_t fifo[qSize];         \
} _##qName;                             \
static volatile _##qName qName =        \
{                                       \
  .head = 0,                            \
  .tail = 0,                            \
  .used = 0,                            \
  .size = qSize,                        \
}

Macros to define fifo and buffer queues, can't use a typedef becuase the size of the fifo array in the queues can change.

Definition at line 154 of file uartdrv.h.

Typedef Documentation

typedef void(* UARTDRV_Callback_t) (struct UARTDRV_HandleData *handle, Ecode_t transferStatus, uint8_t *data, UARTDRV_Count_t transferCount)

UARTDRV transfer completion callback function.

The callback function is called when a transfer has completed. An application should check the transferStatus and itemsTransferred values.

Parameters

[in]	handle	The UARTDRV device handle used to start the transfer.
[in]	transferStatus	Completion status of the transfer operation.
[in]	data	Pointer to transfer data buffer.
[in]	transferCount	Number of bytes transferred.

Definition at line 127 of file uartdrv.h.

typedef struct UARTDRV_HandleData UARTDRV_HandleData_t

UART driver instance handle data structure. The handle is allocated by the application using UARTDRV. There may be several concurrent driver instances in an application. The application must not modify the contents of this handle, and should not depend on its values.

Enumeration Type Documentation

enum UARTDRV_AbortType

Transfer abort type.

Enumerator
uartdrvAbortTransmit	Abort current and queued transmit operations.
uartdrvAbortReceive	Abort current and queued receive operations.
uartdrvAbortAll	Abort all current and queued operations.

Definition at line 89 of file uartdrv.h.

enum UARTDRV_FlowControlState

Flow Control state.

Enumerator
uartdrvFlowControlOn	XON or nRTS/nCTS low.
uartdrvFlowControlOff	XOFF or nRTS/nCTS high.
uartdrvFlowControlAuto	This driver controls the state.

Definition at line 81 of file uartdrv.h.

enum UARTDRV_FlowControlType

Flow Control method.

Enumerator
uartdrvFlowControlNone	None.
uartdrvFlowControlSw	Software XON/XOFF.
uartdrvFlowControlHw	nRTS/nCTS hardware handshake
uartdrvFlowControlHwUart	The UART peripheral controls nRTS/nCTS.

Definition at line 72 of file uartdrv.h.

Function Documentation

Ecode_t UARTDRV_Abort	(	UARTDRV_Handle_t	handle,
		UARTDRV_AbortType_t	type
	)

Abort ongoing UART transfers.

All ongoing or queued operations of the given abort type will be aborted.

Parameters

[in]	handle	Pointer to a UART driver handle.
[in]	type	Abort type – whether to abort only TX, only RX or both.

Returns: ECODE_EMDRV_UARTDRV_OK on success, ECODE_EMDRV_UARTDRV_IDLE if the UART is idle. On failure an appropriate UARTDRV Ecode_t is returned.

Definition at line 1511 of file uartdrv.c.

References UARTDRV_Buffer_t::callback, CORE_DECLARE_IRQ_STATE, CORE_ENTER_ATOMIC, CORE_EXIT_ATOMIC, DMADRV_StopTransfer(), DMADRV_TransferRemainingCount(), ECODE_EMDRV_UARTDRV_ABORTED, ECODE_EMDRV_UARTDRV_IDLE, ECODE_EMDRV_UARTDRV_ILLEGAL_HANDLE, ECODE_EMDRV_UARTDRV_OK, UARTDRV_Buffer_t::itemsRemaining, rxBuffer, UARTDRV_Buffer_t::transferStatus, UARTDRV_GetPeripheralStatus(), UARTDRV_STATUS_TXIDLE, uartdrvAbortAll, uartdrvAbortReceive, uartdrvAbortTransmit, and uartdrvFlowControlHwUart.

Referenced by UARTDRV_DeInit().

Ecode_t UARTDRV_DeInit ( UARTDRV_Handle_t handle )

Deinitialize a UART driver instance.

Parameters

[in] handle Pointer to a UART driver handle.

Returns: ECODE_EMDRV_UARTDRV_OK on success. On failure an appropriate UARTDRV Ecode_t is returned.

Definition at line 1446 of file uartdrv.c.

References CMU_ClockEnable(), DMADRV_DeInit(), DMADRV_FreeChannel(), ECODE_EMDRV_UARTDRV_ILLEGAL_HANDLE, ECODE_EMDRV_UARTDRV_OK, GPIOINT_CallbackRegister(), LEUART_CMD_RXDIS, LEUART_CMD_TXDIS, LEUART_Reset(), LEUART_SYNCBUSY_CMD, UARTDRV_Abort(), UARTDRV_FlowControlSet(), uartdrvAbortAll, uartdrvFlowControlHwUart, uartdrvFlowControlOn, USART_CMD_RXDIS, and USART_CMD_TXDIS.

UARTDRV_FlowControlState_t UARTDRV_FlowControlGetPeerStatus ( UARTDRV_Handle_t handle )

Checks the peer's flow control status.

Parameters

[in] handle Pointer to a UART driver handle.

Returns: Returns uartdrvFlowControlOn if clear to send.

Definition at line 1879 of file uartdrv.c.

UARTDRV_FlowControlState_t UARTDRV_FlowControlGetSelfStatus ( UARTDRV_Handle_t handle )

Checks the self's flow control status.

Parameters

[in] handle Pointer to a UART driver handle.

Returns: Returns uartdrvFlowControlOn if requesting to send.

Definition at line 1894 of file uartdrv.c.

Ecode_t UARTDRV_FlowControlIgnoreRestrain ( UARTDRV_Handle_t handle )

Enables transmission when restrained by flow control.

Parameters

[in] handle Pointer to a UART driver handle.

Returns: ECODE_EMDRV_UARTDRV_OK on success.

Definition at line 1909 of file uartdrv.c.

References ECODE_EMDRV_UARTDRV_OK.

Ecode_t UARTDRV_FlowControlSet	(	UARTDRV_Handle_t	handle,
		UARTDRV_FlowControlState_t	state
	)

Set UART flow control state. Set nRTS pin if hardware flow control is enabled. Send XON/XOFF if software flow control is enabled.

Parameters

[in]	handle	Pointer to a UART driver handle.
[in]	state	Flow control state.

Returns: ECODE_EMDRV_UARTDRV_OK on success.

Definition at line 1816 of file uartdrv.c.

References ECODE_EMDRV_UARTDRV_ILLEGAL_OPERATION, ECODE_EMDRV_UARTDRV_OK, uartdrvFlowControlAuto, and uartdrvFlowControlHwUart.

Referenced by UARTDRV_DeInit().

Ecode_t UARTDRV_FlowControlSetPeerStatus	(	UARTDRV_Handle_t	handle,
		UARTDRV_FlowControlState_t	state
	)

Set peer UART flow control state. Pause/resume transmit accordingly. Only for manual software flow control.

Parameters

[in]	handle	Pointer to a UART driver handle.
[in]	state	Flow control state.

Returns: ECODE_EMDRV_UARTDRV_OK on success.

Definition at line 1846 of file uartdrv.c.

References ECODE_EMDRV_UARTDRV_ILLEGAL_OPERATION, ECODE_EMDRV_UARTDRV_OK, UARTDRV_PauseTransmit(), UARTDRV_ResumeTransmit(), uartdrvFlowControlAuto, uartdrvFlowControlOff, uartdrvFlowControlOn, and uartdrvFlowControlSw.

UARTDRV_Count_t UARTDRV_ForceReceive	(	UARTDRV_Handle_t	handle,
		uint8_t *	data,
		UARTDRV_Count_t	maxCount
	)

Direct receive without interrupts or callback. Blocking function.

Parameters

[in]	handle	Pointer to a UART driver handle.
[in]	data	pointer to buffer.
[in]	maxCount	Maximum number of bytes to receive.

Returns: Number of bytes received.

Definition at line 1930 of file uartdrv.c.

References ECODE_EMDRV_UARTDRV_OK, LEUART_STATUS_RXDATAV, LEUART_STATUS_RXENS, USART_STATUS_RXDATAV, and USART_STATUS_RXENS.

Ecode_t UARTDRV_ForceTransmit	(	UARTDRV_Handle_t	handle,
		uint8_t *	data,
		UARTDRV_Count_t	count
	)

Direct transmit without interrupts or callback. Blocking function that ignores flow control if enabled.

Parameters

[in]	handle	Pointer to a UART driver handle.
[in]	data	Pointer to buffer.
[in]	count	Number of bytes to transmit.

Returns: ECODE_EMDRV_UARTDRV_OK on success.

Definition at line 2015 of file uartdrv.c.

References CORE_IrqIsBlocked(), ECODE_EMDRV_UARTDRV_OK, LEUART_STATUS_TXC, LEUART_STATUS_TXENS, LEUART_Tx(), USART_STATUS_TXC, USART_STATUS_TXENS, and USART_Tx().

UARTDRV_Status_t UARTDRV_GetPeripheralStatus ( UARTDRV_Handle_t handle )

Returns the status of the UART peripheral associated with a given handle.

Parameters

[in] handle Pointer to a UART driver handle.

Returns: UART status value

Definition at line 1624 of file uartdrv.c.

References LEUART_STATUS_RXBLOCK, LEUART_STATUS_RXDATAV, LEUART_STATUS_RXENS, LEUART_STATUS_TXBL, LEUART_STATUS_TXC, LEUART_STATUS_TXENS, UARTDRV_STATUS_RXBLOCK, UARTDRV_STATUS_RXDATAV, UARTDRV_STATUS_RXEN, UARTDRV_STATUS_TXBL, UARTDRV_STATUS_TXC, UARTDRV_STATUS_TXEN, and UARTDRV_STATUS_TXIDLE.

Referenced by UARTDRV_Abort(), UARTDRV_GetReceiveStatus(), and UARTDRV_GetTransmitStatus().

uint8_t UARTDRV_GetReceiveDepth ( UARTDRV_Handle_t handle )

Returns the number of queued receive operations.

Parameters

[in] handle Pointer to a UART driver handle.

Returns: The number of queued operations.

Definition at line 1687 of file uartdrv.c.

UARTDRV_Status_t UARTDRV_GetReceiveStatus	(	UARTDRV_Handle_t	handle,
		uint8_t **	buffer,
		UARTDRV_Count_t *	itemsReceived,
		UARTDRV_Count_t *	itemsRemaining
	)

Check the status of the UART and gather information about any ongoing receive operations.

Parameters

[in]	handle	Pointer to a UART driver handle.
[in]	buffer	Pointer to the current data buffer.
[in]	itemsReceived	Current bytes received count.
[in]	itemsRemaining	Current bytes remaining count.

Returns: UART status.

Definition at line 1709 of file uartdrv.c.

References UARTDRV_Buffer_t::data, DMADRV_TransferRemainingCount(), ECODE_EMDRV_UARTDRV_OK, rxBuffer, UARTDRV_Buffer_t::transferCount, and UARTDRV_GetPeripheralStatus().

uint8_t UARTDRV_GetTransmitDepth ( UARTDRV_Handle_t handle )

Returns the number of queued transmit operations.

Parameters

[in] handle Pointer to a UART driver handle.

Returns: The number of queued operations.

Definition at line 1751 of file uartdrv.c.

UARTDRV_Status_t UARTDRV_GetTransmitStatus	(	UARTDRV_Handle_t	handle,
		uint8_t **	buffer,
		UARTDRV_Count_t *	itemsSent,
		UARTDRV_Count_t *	itemsRemaining
	)

Check the status of the UART and gather information about any ongoing transmit operations.

Parameters

[in]	handle	Pointer to a UART driver handle.
[in]	buffer	Pointer to the current data buffer.
[in]	itemsSent	Current bytes sent count.
[in]	itemsRemaining	Current bytes remaining count.

Returns: UART status.

Definition at line 1772 of file uartdrv.c.

References UARTDRV_Buffer_t::data, DMADRV_TransferRemainingCount(), ECODE_EMDRV_UARTDRV_OK, UARTDRV_Buffer_t::transferCount, and UARTDRV_GetPeripheralStatus().

__STATIC_INLINE Ecode_t UARTDRV_Init	(	UARTDRV_Handle_t	handle,
		UARTDRV_InitUart_t *	initData
	)

Initialize a U(S)ART driver instance.

Deprecated:: This function is deprecated. Use UARTDRV_InitUart() instead.

Parameters

[out]	handle	Pointer to a UARTDRV handle, refer to UARTDRV_Handle_t.
[in]	initData	Pointer to an initialization data structure, refer to UARTDRV_InitUart_t.

Returns: ECODE_EMDRV_UARTDRV_OK on success. On failure an appropriate UARTDRV Ecode_t is returned.

Definition at line 366 of file uartdrv.h.

References UARTDRV_InitUart().

Ecode_t UARTDRV_InitLeuart	(	UARTDRV_Handle_t	handle,
		const UARTDRV_InitLeuart_t *	initData
	)

Initialize a LEUART driver instance.

Parameters

[out]	handle	Pointer to a UARTDRV handle, refer to UARTDRV_Handle_t.
[in]	initData	Pointer to an initialization data structure, refer to UARTDRV_InitLeuart_t.

Returns: ECODE_EMDRV_UARTDRV_OK on success. On failure an appropriate UARTDRV Ecode_t is returned.

Definition at line 1249 of file uartdrv.c.

References _CMU_LFBPRESC0_LEUART0_MASK, _CMU_LFBPRESC0_LEUART0_SHIFT, _LEUART_ROUTE_LOCATION_SHIFT, LEUART_Init_TypeDef::baudrate, UARTDRV_InitLeuart_t::baudRate, LEUART_TypeDef::CMD, CMU, CMU_ClockDivSet(), CMU_ClockEnable(), CMU_ClockFreqGet(), CMU_ClockSelectSet(), CMU_STATUS_LFXOENS, cmuClock_GPIO, cmuClock_HFLE, cmuClock_HFPER, cmuClock_LEUART0, cmuClock_LEUART1, cmuClock_LFB, cmuSelect_HFCLKLE, cmuSelect_LFXO, CORE_DECLARE_IRQ_STATE, CORE_ENTER_ATOMIC, CORE_EXIT_ATOMIC, LEUART_Init_TypeDef::databits, DMADRV_Init(), dmadrvPeripheralSignal_LEUART0_RXDATAV, dmadrvPeripheralSignal_LEUART0_TXBL, dmadrvPeripheralSignal_LEUART1_RXDATAV, dmadrvPeripheralSignal_LEUART1_TXBL, ECODE_EMDRV_UARTDRV_CLOCK_ERROR, ECODE_EMDRV_UARTDRV_ILLEGAL_HANDLE, ECODE_EMDRV_UARTDRV_OK, ECODE_EMDRV_UARTDRV_PARAM_ERROR, LEUART_Init_TypeDef::enable, UARTDRV_InitLeuart_t::fcType, LEUART0, LEUART1, LEUART_CMD_CLEARRX, LEUART_CMD_CLEARTX, LEUART_CTRL_DATABITS_EIGHT, LEUART_Enable(), LEUART_Init(), LEUART_INIT_DEFAULT, LEUART_IntClear(), LEUART_ROUTE_RXPEN, LEUART_ROUTE_TXPEN, LEUART_SYNCBUSY_CMD, leuartDisable, leuartEnableTx, LEUART_Init_TypeDef::parity, UARTDRV_InitLeuart_t::parity, UARTDRV_InitLeuart_t::port, UARTDRV_InitLeuart_t::portLocation, LEUART_TypeDef::ROUTE, UARTDRV_InitLeuart_t::rxQueue, LEUART_Init_TypeDef::stopbits, UARTDRV_InitLeuart_t::stopBits, LEUART_TypeDef::SYNCBUSY, SystemLFXOClockGet(), UARTDRV_InitLeuart_t::txQueue, uartdrvFlowControlHw, uartdrvFlowControlHwUart, and uartdrvFlowControlNone.

Ecode_t UARTDRV_InitUart	(	UARTDRV_Handle_t	handle,
		const UARTDRV_InitUart_t *	initData
	)

Initialize a U(S)ART driver instance.

Parameters

[out]	handle	Pointer to a UARTDRV handle, refer to UARTDRV_Handle_t.
[in]	initData	Pointer to an initialization data structure, refer to UARTDRV_InitUart_t.

Returns: ECODE_EMDRV_UARTDRV_OK on success. On failure an appropriate UARTDRV Ecode_t is returned.

Definition at line 1015 of file uartdrv.c.

Referenced by UARTDRV_Init().

Ecode_t UARTDRV_PauseTransmit ( UARTDRV_Handle_t handle )

Pause an ongoing transmit operation.

Parameters

[in] handle Pointer to a UART driver handle.

Returns: ECODE_EMDRV_UARTDRV_OK on success. On failure an appropriate UARTDRV Ecode_t is returned.

Definition at line 2098 of file uartdrv.c.

References DMADRV_PauseTransfer(), DMADRV_TransferActive(), ECODE_EMDRV_DMADRV_OK, ECODE_EMDRV_UARTDRV_ILLEGAL_HANDLE, ECODE_EMDRV_UARTDRV_ILLEGAL_OPERATION, ECODE_EMDRV_UARTDRV_OK, and uartdrvFlowControlOn.

Referenced by UARTDRV_FlowControlSetPeerStatus().

Ecode_t UARTDRV_Receive	(	UARTDRV_Handle_t	handle,
		uint8_t *	data,
		UARTDRV_Count_t	count,
		UARTDRV_Callback_t	callback
	)

Start a non-blocking receive.

Parameters

[in]	handle	Pointer to a UART driver handle.
[in]	data	Receive data buffer.
[in]	count	Number of bytes received.
[in]	callback	Transfer completion callback.

Returns: ECODE_EMDRV_UARTDRV_OK on success.

Definition at line 2141 of file uartdrv.c.

References UARTDRV_Buffer_t::callback, UARTDRV_Buffer_t::data, ECODE_EMDRV_UARTDRV_OK, ECODE_EMDRV_UARTDRV_WAITING, UARTDRV_Buffer_t::itemsRemaining, UARTDRV_Buffer_t::transferCount, UARTDRV_Buffer_t::transferStatus, uartdrvFlowControlHwUart, and uartdrvFlowControlOn.

Ecode_t UARTDRV_ReceiveB	(	UARTDRV_Handle_t	handle,
		uint8_t *	data,
		UARTDRV_Count_t	count
	)

Start a blocking receive.

Parameters

[in]	handle	Pointer to a UART driver handle.
[in]	data	Receive data buffer.
[in]	count	Number of bytes received.

Returns: ECODE_EMDRV_UARTDRV_OK on success.

Definition at line 2196 of file uartdrv.c.

References UARTDRV_Buffer_t::callback, UARTDRV_Buffer_t::data, ECODE_EMDRV_UARTDRV_OK, ECODE_EMDRV_UARTDRV_WAITING, EMU_EnterEM1(), UARTDRV_Buffer_t::itemsRemaining, UARTDRV_Buffer_t::transferCount, UARTDRV_Buffer_t::transferStatus, uartdrvFlowControlHwUart, and uartdrvFlowControlOn.

Ecode_t UARTDRV_ResumeTransmit ( UARTDRV_Handle_t handle )

Resume a paused transmit operation.

Parameters

[in] handle Pointer to a UART driver handle.

Returns: ECODE_EMDRV_UARTDRV_OK on success. On failure an appropriate UARTDRV Ecode_t is returned.

Definition at line 2250 of file uartdrv.c.

References DMADRV_ResumeTransfer(), DMADRV_TransferActive(), ECODE_EMDRV_DMADRV_OK, ECODE_EMDRV_UARTDRV_ILLEGAL_HANDLE, ECODE_EMDRV_UARTDRV_ILLEGAL_OPERATION, ECODE_EMDRV_UARTDRV_OK, and uartdrvFlowControlOn.

Referenced by UARTDRV_FlowControlSetPeerStatus().

Ecode_t UARTDRV_Transmit	(	UARTDRV_Handle_t	handle,
		uint8_t *	data,
		UARTDRV_Count_t	count,
		UARTDRV_Callback_t	callback
	)

Start a non-blocking transmit.

Parameters

[in]	handle	Pointer to a UART driver handle.
[in]	data	Transmit data buffer.
[in]	count	Number of bytes to transmit.
[in]	callback	Transfer completion callback.

Returns: ECODE_EMDRV_UARTDRV_OK on success.

Definition at line 2290 of file uartdrv.c.

References UARTDRV_Buffer_t::callback, CORE_ATOMIC_SECTION, UARTDRV_Buffer_t::data, ECODE_EMDRV_UARTDRV_OK, ECODE_EMDRV_UARTDRV_WAITING, UARTDRV_Buffer_t::itemsRemaining, UARTDRV_Buffer_t::transferCount, and UARTDRV_Buffer_t::transferStatus.

Ecode_t UARTDRV_TransmitB	(	UARTDRV_Handle_t	handle,
		uint8_t *	data,
		UARTDRV_Count_t	count
	)

Start a blocking transmit.

Parameters

[in]	handle	Pointer to a UART driver handle.
[in]	data	Transmit data buffer.
[in]	count	Number of bytes to transmit.

Returns: ECODE_EMDRV_UARTDRV_OK on success.

Definition at line 2343 of file uartdrv.c.

References UARTDRV_Buffer_t::callback, UARTDRV_Buffer_t::data, ECODE_EMDRV_UARTDRV_OK, ECODE_EMDRV_UARTDRV_WAITING, EMU_EnterEM1(), UARTDRV_Buffer_t::itemsRemaining, UARTDRV_Buffer_t::transferCount, and UARTDRV_Buffer_t::transferStatus.

Detailed Description

Introduction

Configuration Options

The API

Flow Control Support

Hardware Flow Control

Software Flow Control

Example

Data Structures

Macros

Typedefs

Enumerations

Functions

Macro Definition Documentation

Typedef Documentation

Enumeration Type Documentation

Function Documentation