201 lines
7.6 KiB
C
201 lines
7.6 KiB
C
/*******************************************************************************
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*
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* Copyright (C) 2014 - 2015 Xilinx, Inc. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* Use of the Software is limited solely to applications:
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* (a) running on a Xilinx device, or
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* (b) that interact with a Xilinx device through a bus or interconnect.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* XILINX CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Except as contained in this notice, the name of the Xilinx shall not be used
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* in advertising or otherwise to promote the sale, use or other dealings in
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* this Software without prior written authorization from Xilinx.
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*
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*******************************************************************************/
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/******************************************************************************/
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/**
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*
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* @file xdptx_timer_example.c
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*
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* Contains a design example using the XDptx driver with a user-defined hook
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* for delay. The reasoning behind this is that MicroBlaze sleep is not very
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* accurate without a hardware timer. For systems that have a hardware timer,
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* the user may override the default MicroBlaze sleep with a function that will
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* use the hardware timer.
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*
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* @note This example requires an AXI timer in the system.
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* @note For this example to display output, the user will need to
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* implement initialization of the system (Dptx_PlatformInit) and,
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* after training is complete, implement configuration of the video
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* stream source in order to provide the DisplayPort core with
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* input (Dptx_StreamSrc* - called in xdptx_example_common.c). See
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* XAPP1178 for reference.
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* @note The functions Dptx_PlatformInit and Dptx_StreamSrc* are declared
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* extern in xdptx_example_common.h and are left up to the user to
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* implement.
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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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* 1.0 als 06/17/14 Initial creation.
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* </pre>
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*
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*******************************************************************************/
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/******************************* Include Files ********************************/
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#include "xdptx_example_common.h"
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#include "xtmrctr.h"
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/**************************** Function Prototypes *****************************/
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u32 Dptx_TimerExample(XDptx *InstancePtr, u16 DeviceId,
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XTmrCtr *TimerCounterPtr, XDptx_TimerHandler UserSleepFunc);
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static void Dptx_CustomWaitUs(void *InstancePtr, u32 MicroSeconds);
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/*************************** Variable Declarations ****************************/
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XTmrCtr TimerCounterInst; /* The timer counter instance. */
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/**************************** Function Definitions ****************************/
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/******************************************************************************/
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/**
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* This function is the main function of the XDptx timer example.
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*
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* @param None.
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*
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* @return
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* - XST_SUCCESS if the timer example finished successfully.
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* - XST_FAILURE otherwise.
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*
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* @note None.
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*
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*******************************************************************************/
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int main(void)
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{
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u32 Status;
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/* Run the XDptx timer example. */
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Status = Dptx_TimerExample(&DptxInstance, DPTX_DEVICE_ID,
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&TimerCounterInst, &Dptx_CustomWaitUs);
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if (Status != XST_SUCCESS) {
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return XST_FAILURE;
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}
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return XST_SUCCESS;
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}
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/******************************************************************************/
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/**
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* The main entry point for the timer example using the XDptx driver. This
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* function will set up the system and the custom sleep handler. If this is
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* successful, link training will commence and a video stream will start being
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* sent over the main link.
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*
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* @param InstancePtr is a pointer to the XDptx instance.
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* @param DeviceId is the unique device ID of the DisplayPort TX core
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* instance.
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* @param TimerCounterPtr is a pointer to the timer instance.
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* @param UserSleepFunc is a pointer to the custom handler for sleep.
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*
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* @return
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* - XST_SUCCESS if the system was set up correctly and link
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* training was successful.
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* - XST_FAILURE otherwise.
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*
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* @note None.
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*
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*******************************************************************************/
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u32 Dptx_TimerExample(XDptx *InstancePtr, u16 DeviceId,
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XTmrCtr *TimerCounterPtr, XDptx_TimerHandler UserSleepFunc)
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{
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u32 Status;
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/* Use single-stream transport (SST) mode for this example. */
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XDptx_MstCfgModeDisable(InstancePtr);
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/* Do platform initialization here. This is hardware system specific -
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* it is up to the user to implement this function. */
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Dptx_PlatformInit();
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/*******************/
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/* Set a custom timer handler for improved delay accuracy on MicroBlaze
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* systems since the driver does not assume/have a dependency on the
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* system having a timer in the FPGA.
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* Note: This only has an affect for MicroBlaze systems since the Zynq
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* ARM SoC contains a timer, which is used when the driver calls the
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* delay function. */
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XDptx_SetUserTimerHandler(InstancePtr, UserSleepFunc, TimerCounterPtr);
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Status = Dptx_SetupExample(InstancePtr, DeviceId);
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if (Status != XST_SUCCESS) {
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return XST_FAILURE;
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}
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XDptx_EnableTrainAdaptive(InstancePtr, TRAIN_ADAPTIVE);
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XDptx_SetHasRedriverInPath(InstancePtr, TRAIN_HAS_REDRIVER);
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/* A sink monitor must be connected at this point. See the polling or
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* interrupt examples for how to wait for a connection event. */
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Status = Dptx_Run(InstancePtr);
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if (Status != XST_SUCCESS) {
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return XST_FAILURE;
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}
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return XST_SUCCESS;
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}
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/******************************************************************************/
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/**
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* This function is used to override the driver's default sleep functionality.
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* For MicroBlaze systems, the XDptx_WaitUs driver function's default behavior
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* is to use the MB_Sleep function from microblaze_sleep.h, which is implemented
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* in software and only has millisecond accuracy. For this reason, using a
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* hardware timer is preferrable. For ARM/Zynq SoC systems, the SoC's timer is
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* used - XDptx_WaitUs will ignore this custom timer handler.
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*
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* @param InstancePtr is a pointer to the XDptx instance.
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*
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* @return None.
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*
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* @note Use the XDptx_SetUserTimerHandler driver function to set this
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* function as the handler for when the XDptx_WaitUs driver
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* function is called.
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*
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*******************************************************************************/
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static void Dptx_CustomWaitUs(void *InstancePtr, u32 MicroSeconds)
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{
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XDptx *XDptx_InstancePtr = (XDptx *)InstancePtr;
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u32 TimerVal;
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XTmrCtr_Start(XDptx_InstancePtr->UserTimerPtr, 0);
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/* Wait specified number of useconds. */
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do {
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TimerVal = XTmrCtr_GetValue(XDptx_InstancePtr->UserTimerPtr, 0);
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}
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while (TimerVal < (MicroSeconds *
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(XDptx_InstancePtr->Config.SAxiClkHz / 1000000)));
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XTmrCtr_Stop(XDptx_InstancePtr->UserTimerPtr, 0);
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}
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