200 lines
7.1 KiB
C
200 lines
7.1 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_poll_example.c
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*
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* Contains a design example using the XDptx driver with polling. Once the
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* polling detects a Hot-Plug-Detect event (HPD - DisplayPort cable is plugged/
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* unplugged or the monitor is turned on/off), the main link will be trained.
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*
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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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/**************************** Function Prototypes *****************************/
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u32 Dptx_PollExample(XDptx *InstancePtr, u16 DeviceId);
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static void Dptx_HpdPoll(XDptx *InstancePtr);
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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 polling 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_FAILURE if the polling example was unsuccessful - system
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* setup failed.
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*
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* @note Unless setup failed, main will never return since
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* Dptx_PollExample is blocking (it is continuously polling for
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* Hot-Plug-Detect (HPD) events.
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*
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*******************************************************************************/
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int main(void)
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{
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/* Run the XDptx polling example. */
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Dptx_PollExample(&DptxInstance, DPTX_DEVICE_ID);
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return XST_FAILURE;
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}
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/******************************************************************************/
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/**
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* The main entry point for the polling example using the XDptx driver. This
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* function will set up the system. If this is successful, this example will
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* begin polling the Hot-Plug-Detect (HPD) status registers for HPD events. Once
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* a connection event or a pulse is detected, link training will commence (if
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* needed) and a video stream will start being 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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*
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* @return
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* - XST_FAILURE if the system setup failed.
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* - XST_SUCCESS should never return since this function, if setup
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* was successful, is blocking.
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*
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* @note If system setup was successful, this function is blocking in
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* order to illustrate polling taking place for HPD events.
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*
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*******************************************************************************/
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u32 Dptx_PollExample(XDptx *InstancePtr, u16 DeviceId)
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{
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u32 Status;
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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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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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/* Continuously poll for HPD events. */
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while (1) {
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Dptx_HpdPoll(InstancePtr);
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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 polls the XDPTX_INTERRUPT_SIG_STATE and XDPTX_INTERRUPT_STATUS
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* registers for Hot-Plug-Detect (HPD) events and handles them accordingly. If a
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* connection or pulse event is detected, link training will begin (if required)
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* and a video stream will be initiated.
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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 None.
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*
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*******************************************************************************/
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static void Dptx_HpdPoll(XDptx *InstancePtr)
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{
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u32 InterruptSignalState;
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u32 InterruptStatus;
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u32 HpdState;
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u32 HpdEvent;
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u32 HpdPulseDetected;
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u32 HpdDuration;
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/* Read interrupt registers. */
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InterruptSignalState = XDptx_ReadReg(InstancePtr->Config.BaseAddr,
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XDPTX_INTERRUPT_SIG_STATE);
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InterruptStatus = XDptx_ReadReg(InstancePtr->Config.BaseAddr,
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XDPTX_INTERRUPT_STATUS);
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/* Check for HPD events. */
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HpdState = InterruptSignalState &
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XDPTX_INTERRUPT_SIG_STATE_HPD_STATE_MASK;
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HpdEvent = InterruptStatus & XDPTX_INTERRUPT_STATUS_HPD_EVENT_MASK;
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HpdPulseDetected = InterruptStatus &
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XDPTX_INTERRUPT_STATUS_HPD_PULSE_DETECTED_MASK;
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if (HpdPulseDetected) {
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HpdDuration = XDptx_ReadReg(InstancePtr->Config.BaseAddr,
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XDPTX_HPD_DURATION);
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}
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/* HPD event handling. */
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if (HpdState && HpdEvent) {
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xil_printf("+===> HPD connection event detected.\n");
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/* Initiate link training. */
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Dptx_Run(InstancePtr);
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}
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else if (HpdState && HpdPulseDetected && (HpdDuration >= 250)) {
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xil_printf("===> HPD pulse detected.\n");
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/* Re-train if needed. */
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Dptx_Run(InstancePtr);
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}
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else if (!HpdState && HpdEvent) {
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xil_printf("+===> HPD disconnection event detected.\n\n");
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/* Disable main link. */
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XDptx_DisableMainLink(InstancePtr);
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}
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}
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