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32 /****************************************************************************/
36 * @addtogroup uartlite_v3_1
40 * This component contains the implementation of the XUartLite component which is
41 * the driver for the Xilinx UART Lite device. This UART is a minimal hardware
42 * implementation with minimal features. Most of the features, including baud
43 * rate, parity, and number of data bits are only configurable when the hardware
44 * device is built, rather than at run time by software.
46 * The device has 16 byte transmit and receive FIFOs and supports interrupts.
47 * The device does not have any way to disable the receiver such that the
48 * receive FIFO may contain unwanted data. The FIFOs are not flushed when the
49 * driver is initialized, but a function is provided to allow the user to
50 * reset the FIFOs if desired.
52 * The driver defaults to no interrupts at initialization such that interrupts
53 * must be enabled if desired. An interrupt is generated when the transmit FIFO
54 * transitions from having data to being empty or when any data is contained in
57 * In order to use interrupts, it's necessary for the user to connect the driver
58 * interrupt handler, XUartLite_InterruptHandler, to the interrupt system of the
59 * application. This function does not save and restore the processor context
60 * such that the user must provide it. Send and receive handlers may be set for
61 * the driver such that the handlers are called when transmit and receive
62 * interrupts occur. The handlers are called from interrupt context and are
63 * designed to allow application specific processing to be performed.
65 * The functions, XUartLite_Send and XUartLite_Recv, are provided in the driver
66 * to allow data to be sent and received. They are designed to be used in
67 * polled or interrupt modes.
69 * The driver provides a status for each received byte indicating any parity
70 * frame or overrun error. The driver provides statistics which allow visibility
73 * <b>Initialization & Configuration</b>
75 * The XUartLite_Config structure is used by the driver to configure itself. This
76 * configuration structure is typically created by the tool-chain based on HW
79 * To support multiple runtime loading and initialization strategies employed
80 * by various operating systems, the driver instance can be initialized in one
81 * of the following ways:
83 * - XUartLite_Initialize(InstancePtr, DeviceId) - The driver looks up its own
84 * configuration structure created by the tool-chain based on an ID provided
87 * - XUartLite_CfgInitialize(InstancePtr, CfgPtr, EffectiveAddr) - Uses a
88 * configuration structure provided by the caller. If running in a system
89 * with address translation, the provided virtual memory base address
90 * replaces the physical address present in the configuration structure.
92 * <b>RTOS Independence</b>
94 * This driver is intended to be RTOS and processor independent. It works
95 * with physical addresses only. Any needs for dynamic memory management,
96 * threads or thread mutual exclusion, virtual memory, or cache control must
97 * be satisfied by the layer above this driver.
101 * The driver is partitioned such that a minimal implementation may be used.
102 * More features require additional files to be linked in.
105 * MODIFICATION HISTORY:
107 * Ver Who Date Changes
108 * ----- ---- -------- -----------------------------------------------
109 * 1.00a ecm 08/31/01 First release
110 * 1.00b jhl 02/21/02 Repartitioned the driver for smaller files
111 * 1.01a jvb 12/14/05 I separated dependency on the static config table and
112 * xparameters.h from the driver initialization by moving
113 * _Initialize and _LookupConfig to _sinit.c. I also added
114 * the new _CfgInitialize routine.
115 * 1.02a rpm 02/14/07 Added check for outstanding transmission before
116 * calling the send callback (avoids extraneous
117 * callback invocations) in interrupt service routine.
118 * 1.12a mta 03/31/07 Updated to new coding conventions
119 * 1.13a sv 01/21/08 Updated driver to support access through DCR bus
120 * 1.14a sdm 08/22/08 Removed support for static interrupt handlers from the MDD
122 * 1.14a sdm 09/26/08 Updated code to avoid race condition in
123 * XUartLite_SendBuffer
124 * 2.00a ktn 10/20/09 Updated to use HAL Processor APIs. The macros have been
125 * renamed to remove _m from the name. XUartLite_mClearStats
126 * macro is removed and XUartLite_ClearStats function should
127 * be used in its place.
128 * 2.01a adk 18/04/13 Updated the code to avoid unused variable
129 * warnings when compiling with the -Wextra -Wall flags
130 * In the file xuartlite.c. CR:704999.
131 * Added notes for CR 710483 that the XUL_FIFO_SIZE is not
132 * used in the driver. This is the size of the FIFO for
133 * Transmit/Receive FIFOs which cannot be changed.
134 * 3.0 adk 17/12/13 Fixed CR:741186,761863 Changes are made in the file
135 * xuartlite_selftest.c
136 * 3.0 adk 19/12/13 Update the driver as per new TCL API's
137 * 3.1 nsk 21/07/15 Updated XUartLite_ReceiveBuffer function in xuartlite.c
138 * to update the receive data into user buffer in critical
140 * 3.2 sk 11/10/15 Used UINTPTR instead of u32 for Baseaddress CR# 867425.
141 * Changed the prototype of XUartLite_CfgInitialize API.
145 *****************************************************************************/
147 #ifndef XUARTLITE_H /* prevent circular inclusions */
148 #define XUARTLITE_H /* by using protection macros */
154 /***************************** Include Files ********************************/
156 #include "xil_types.h"
157 #include "xil_assert.h"
160 /************************** Constant Definitions ****************************/
162 /**************************** Type Definitions ******************************/
165 * Callback function. The first argument is a callback reference passed in by
166 * the upper layer when setting the callback functions, and passed back to the
167 * upper layer when the callback is invoked.
168 * The second argument is the ByteCount which is the number of bytes that
169 * actually moved from/to the buffer provided in the _Send/_Receive call.
171 typedef void (*XUartLite_Handler)(void *CallBackRef, unsigned int ByteCount);
174 * Statistics for the XUartLite driver
177 u32 TransmitInterrupts; /**< Number of transmit interrupts */
178 u32 ReceiveInterrupts; /**< Number of receive interrupts */
179 u32 CharactersTransmitted; /**< Number of characters transmitted */
180 u32 CharactersReceived; /**< Number of characters received */
181 u32 ReceiveOverrunErrors; /**< Number of receive overruns */
182 u32 ReceiveParityErrors; /**< Number of receive parity errors */
183 u32 ReceiveFramingErrors; /**< Number of receive framing errors */
187 * The following data type is used to manage the buffers that are handled
188 * when sending and receiving data in the interrupt mode. It is intended
189 * for internal use only.
193 unsigned int RequestedBytes;
194 unsigned int RemainingBytes;
198 * This typedef contains configuration information for the device.
201 u16 DeviceId; /**< Unique ID of device */
202 UINTPTR RegBaseAddr; /**< Register base address */
203 u32 BaudRate; /**< Fixed baud rate */
204 u8 UseParity; /**< Parity generator enabled when TRUE */
205 u8 ParityOdd; /**< Parity generated is odd when TRUE, even
207 u8 DataBits; /**< Fixed data bits */
211 * The XUartLite driver instance data. The user is required to allocate a
212 * variable of this type for every UART Lite device in the system. A pointer
213 * to a variable of this type is then passed to the driver API functions.
216 XUartLite_Stats Stats; /* Component Statistics */
217 UINTPTR RegBaseAddress; /* Base address of registers */
218 u32 IsReady; /* Device is initialized and ready */
220 XUartLite_Buffer SendBuffer;
221 XUartLite_Buffer ReceiveBuffer;
223 XUartLite_Handler RecvHandler;
224 void *RecvCallBackRef; /* Callback ref for recv handler */
225 XUartLite_Handler SendHandler;
226 void *SendCallBackRef; /* Callback ref for send handler */
230 /***************** Macros (Inline Functions) Definitions ********************/
233 /************************** Function Prototypes *****************************/
236 * Initialization functions in xuartlite_sinit.c
238 int XUartLite_Initialize(XUartLite *InstancePtr, u16 DeviceId);
239 XUartLite_Config *XUartLite_LookupConfig(u16 DeviceId);
242 * Required functions, in file xuart.c
244 int XUartLite_CfgInitialize(XUartLite *InstancePtr,
245 XUartLite_Config *Config,
246 UINTPTR EffectiveAddr);
248 void XUartLite_ResetFifos(XUartLite *InstancePtr);
250 unsigned int XUartLite_Send(XUartLite *InstancePtr, u8 *DataBufferPtr,
251 unsigned int NumBytes);
252 unsigned int XUartLite_Recv(XUartLite *InstancePtr, u8 *DataBufferPtr,
253 unsigned int NumBytes);
255 int XUartLite_IsSending(XUartLite *InstancePtr);
258 * Functions for statistics, in file xuartlite_stats.c
260 void XUartLite_GetStats(XUartLite *InstancePtr, XUartLite_Stats *StatsPtr);
261 void XUartLite_ClearStats(XUartLite *InstancePtr);
264 * Functions for self-test, in file xuartlite_selftest.c
266 int XUartLite_SelfTest(XUartLite *InstancePtr);
269 * Functions for interrupts, in file xuartlite_intr.c
271 void XUartLite_EnableInterrupt(XUartLite *InstancePtr);
272 void XUartLite_DisableInterrupt(XUartLite *InstancePtr);
274 void XUartLite_SetRecvHandler(XUartLite *InstancePtr, XUartLite_Handler FuncPtr,
276 void XUartLite_SetSendHandler(XUartLite *InstancePtr, XUartLite_Handler FuncPtr,
279 void XUartLite_InterruptHandler(XUartLite *InstancePtr);
285 #endif /* end of protection macro */