275 lines
11 KiB
C
275 lines
11 KiB
C
/******************************************************************************
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* Copyright (C) 2002 - 2022 Xilinx, Inc. All rights reserved.
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* SPDX-License-Identifier: MIT
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******************************************************************************/
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/****************************************************************************/
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/**
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*
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* @file xuartlite.h
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* @addtogroup uartlite_v3_7
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* @{
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* @details
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*
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* This component contains the implementation of the XUartLite component which is
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* the driver for the Xilinx UART Lite device. This UART is a minimal hardware
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* implementation with minimal features. Most of the features, including baud
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* rate, parity, and number of data bits are only configurable when the hardware
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* device is built, rather than at run time by software.
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*
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* The device has 16 byte transmit and receive FIFOs and supports interrupts.
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* The device does not have any way to disable the receiver such that the
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* receive FIFO may contain unwanted data. The FIFOs are not flushed when the
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* driver is initialized, but a function is provided to allow the user to
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* reset the FIFOs if desired.
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*
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* The driver defaults to no interrupts at initialization such that interrupts
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* must be enabled if desired. An interrupt is generated when the transmit FIFO
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* transitions from having data to being empty or when any data is contained in
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* the receive FIFO.
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*
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* In order to use interrupts, it's necessary for the user to connect the driver
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* interrupt handler, XUartLite_InterruptHandler, to the interrupt system of the
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* application. This function does not save and restore the processor context
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* such that the user must provide it. Send and receive handlers may be set for
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* the driver such that the handlers are called when transmit and receive
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* interrupts occur. The handlers are called from interrupt context and are
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* designed to allow application specific processing to be performed.
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*
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* The functions, XUartLite_Send and XUartLite_Recv, are provided in the driver
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* to allow data to be sent and received. They are designed to be used in
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* polled or interrupt modes.
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*
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* The driver provides a status for each received byte indicating any parity
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* frame or overrun error. The driver provides statistics which allow visibility
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* into these errors.
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*
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* <b>Initialization & Configuration</b>
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*
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* The XUartLite_Config structure is used by the driver to configure itself. This
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* configuration structure is typically created by the tool-chain based on HW
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* build properties.
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*
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* To support multiple runtime loading and initialization strategies employed
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* by various operating systems, the driver instance can be initialized in one
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* of the following ways:
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*
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* - XUartLite_Initialize(InstancePtr, DeviceId) - The driver looks up its own
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* configuration structure created by the tool-chain based on an ID provided
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* by the tool-chain.
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*
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* - XUartLite_CfgInitialize(InstancePtr, CfgPtr, EffectiveAddr) - Uses a
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* configuration structure provided by the caller. If running in a system
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* with address translation, the provided virtual memory base address
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* replaces the physical address present in the configuration structure.
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*
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* <b>RTOS Independence</b>
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*
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* This driver is intended to be RTOS and processor independent. It works
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* with physical addresses only. Any needs for dynamic memory management,
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* threads or thread mutual exclusion, virtual memory, or cache control must
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* be satisfied by the layer above this driver.
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*
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* @note
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*
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* The driver is partitioned such that a minimal implementation may be used.
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* More features require additional files to be linked in.
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*
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* <pre>
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* MODIFICATION HISTORY:
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*
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* Ver Who Date Changes
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* ----- ---- -------- -----------------------------------------------
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* 1.00a ecm 08/31/01 First release
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* 1.00b jhl 02/21/02 Repartitioned the driver for smaller files
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* 1.01a jvb 12/14/05 I separated dependency on the static config table and
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* xparameters.h from the driver initialization by moving
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* _Initialize and _LookupConfig to _sinit.c. I also added
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* the new _CfgInitialize routine.
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* 1.02a rpm 02/14/07 Added check for outstanding transmission before
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* calling the send callback (avoids extraneous
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* callback invocations) in interrupt service routine.
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* 1.12a mta 03/31/07 Updated to new coding conventions
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* 1.13a sv 01/21/08 Updated driver to support access through DCR bus
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* 1.14a sdm 08/22/08 Removed support for static interrupt handlers from the MDD
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* file
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* 1.14a sdm 09/26/08 Updated code to avoid race condition in
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* XUartLite_SendBuffer
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* 2.00a ktn 10/20/09 Updated to use HAL Processor APIs. The macros have been
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* renamed to remove _m from the name. XUartLite_mClearStats
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* macro is removed and XUartLite_ClearStats function should
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* be used in its place.
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* 2.01a adk 18/04/13 Updated the code to avoid unused variable
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* warnings when compiling with the -Wextra -Wall flags
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* In the file xuartlite.c. CR:704999.
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* Added notes for CR 710483 that the XUL_FIFO_SIZE is not
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* used in the driver. This is the size of the FIFO for
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* Transmit/Receive FIFOs which cannot be changed.
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* 3.0 adk 17/12/13 Fixed CR:741186,761863 Changes are made in the file
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* xuartlite_selftest.c
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* 3.0 adk 19/12/13 Update the driver as per new TCL API's
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* 3.1 nsk 21/07/15 Updated XUartLite_ReceiveBuffer function in xuartlite.c
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* to update the receive data into user buffer in critical
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* region.CR#865787.
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* 3.2 sk 11/10/15 Used UINTPTR instead of u32 for Baseaddress CR# 867425.
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* Changed the prototype of XUartLite_CfgInitialize API.
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* ms 01/23/17 Added xil_printf statement in main function for all
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* examples to ensure that "Successfully ran" and "Failed"
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* strings are available in all examples. This is a fix
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* for CR-965028.
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* ms 03/17/17 Added readme.txt file in examples folder for doxygen
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* generation.
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* 3.3 sne 09/09/19 Updated driver tcl file for supporting pl and ps ip's.
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* 3.3 sne 09/13/19 Updated driver tcl file for mdm & tmr_sem ip's.
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* 3.7 adk 31/01/22 Fix interrupt controller name in SMP designs, Changes are
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* made in the interrupt app tcl file.
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* 3.7 adk 14/02/22 When generating peripheral tests for TMR subsystem based
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* designs don't pull the driver examples when uartlite is
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* configured as a TMR SEM fix for CR-1121291, changes are
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* made in the uartlite_tapp.tcl file.
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* </pre>
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*
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*****************************************************************************/
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#ifndef XUARTLITE_H /* prevent circular inclusions */
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#define XUARTLITE_H /* by using protection macros */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/***************************** Include Files ********************************/
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#include "xil_types.h"
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#include "xil_assert.h"
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#include "xstatus.h"
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/************************** Constant Definitions ****************************/
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/**************************** Type Definitions ******************************/
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/**
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* Callback function. The first argument is a callback reference passed in by
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* the upper layer when setting the callback functions, and passed back to the
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* upper layer when the callback is invoked.
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* The second argument is the ByteCount which is the number of bytes that
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* actually moved from/to the buffer provided in the _Send/_Receive call.
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*/
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typedef void (*XUartLite_Handler)(void *CallBackRef, unsigned int ByteCount);
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/**
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* Statistics for the XUartLite driver
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*/
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typedef struct {
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u32 TransmitInterrupts; /**< Number of transmit interrupts */
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u32 ReceiveInterrupts; /**< Number of receive interrupts */
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u32 CharactersTransmitted; /**< Number of characters transmitted */
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u32 CharactersReceived; /**< Number of characters received */
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u32 ReceiveOverrunErrors; /**< Number of receive overruns */
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u32 ReceiveParityErrors; /**< Number of receive parity errors */
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u32 ReceiveFramingErrors; /**< Number of receive framing errors */
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} XUartLite_Stats;
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/**
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* The following data type is used to manage the buffers that are handled
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* when sending and receiving data in the interrupt mode. It is intended
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* for internal use only.
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*/
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typedef struct {
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u8 *NextBytePtr;
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unsigned int RequestedBytes;
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unsigned int RemainingBytes;
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} XUartLite_Buffer;
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/**
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* This typedef contains configuration information for the device.
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*/
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typedef struct {
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u16 DeviceId; /**< Unique ID of device */
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UINTPTR RegBaseAddr; /**< Register base address */
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u32 BaudRate; /**< Fixed baud rate */
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u8 UseParity; /**< Parity generator enabled when TRUE */
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u8 ParityOdd; /**< Parity generated is odd when TRUE, even
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when FALSE */
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u8 DataBits; /**< Fixed data bits */
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} XUartLite_Config;
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/**
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* The XUartLite driver instance data. The user is required to allocate a
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* variable of this type for every UART Lite device in the system. A pointer
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* to a variable of this type is then passed to the driver API functions.
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*/
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typedef struct {
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XUartLite_Stats Stats; /* Component Statistics */
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UINTPTR RegBaseAddress; /* Base address of registers */
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u32 IsReady; /* Device is initialized and ready */
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XUartLite_Buffer SendBuffer;
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XUartLite_Buffer ReceiveBuffer;
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XUartLite_Handler RecvHandler;
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void *RecvCallBackRef; /* Callback ref for recv handler */
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XUartLite_Handler SendHandler;
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void *SendCallBackRef; /* Callback ref for send handler */
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} XUartLite;
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/***************** Macros (Inline Functions) Definitions ********************/
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/************************** Function Prototypes *****************************/
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/*
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* Initialization functions in xuartlite_sinit.c
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*/
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int XUartLite_Initialize(XUartLite *InstancePtr, u16 DeviceId);
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XUartLite_Config *XUartLite_LookupConfig(u16 DeviceId);
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/*
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* Required functions, in file xuart.c
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*/
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int XUartLite_CfgInitialize(XUartLite *InstancePtr,
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XUartLite_Config *Config,
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UINTPTR EffectiveAddr);
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void XUartLite_ResetFifos(XUartLite *InstancePtr);
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unsigned int XUartLite_Send(XUartLite *InstancePtr, u8 *DataBufferPtr,
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unsigned int NumBytes);
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unsigned int XUartLite_Recv(XUartLite *InstancePtr, u8 *DataBufferPtr,
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unsigned int NumBytes);
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int XUartLite_IsSending(XUartLite *InstancePtr);
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/*
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* Functions for statistics, in file xuartlite_stats.c
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*/
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void XUartLite_GetStats(XUartLite *InstancePtr, XUartLite_Stats *StatsPtr);
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void XUartLite_ClearStats(XUartLite *InstancePtr);
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/*
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* Functions for self-test, in file xuartlite_selftest.c
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*/
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int XUartLite_SelfTest(XUartLite *InstancePtr);
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/*
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* Functions for interrupts, in file xuartlite_intr.c
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*/
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void XUartLite_EnableInterrupt(XUartLite *InstancePtr);
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void XUartLite_DisableInterrupt(XUartLite *InstancePtr);
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void XUartLite_SetRecvHandler(XUartLite *InstancePtr, XUartLite_Handler FuncPtr,
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void *CallBackRef);
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void XUartLite_SetSendHandler(XUartLite *InstancePtr, XUartLite_Handler FuncPtr,
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void *CallBackRef);
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void XUartLite_InterruptHandler(XUartLite *InstancePtr);
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#ifdef __cplusplus
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}
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#endif
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#endif /* end of protection macro */
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/** @} */
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