354 lines
10 KiB
C
354 lines
10 KiB
C
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/******************************************************************************
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*
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* Copyright (C) 2010 - 2014 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 xaxicdma_example_simple_poll.c
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*
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* This file demonstrates how to use xaxicdma driver on the Xilinx AXI
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* CDMA core (AXICDMA) to transfer packets in simple transfer mode without
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* interrupt.
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*
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* The completion of the transfer is checked through polling. Using polling
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* mode can give better performance on an idle system, where the DMA engine
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* is lowly loaded, and the application has nothing else to do. The polling
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* mode can yield better turn-around time for DMA transfers.
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*
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* Modify NUMBER_OF_TRANSFERS for a different number of simple transfer to be
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* done in this test.
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*
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* To see the debug print, you need a Uart16550 or uartlite in your system,
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* and please set "-DDEBUG" in your compiler options for the example, also
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* comment out the "#undef DEBUG" in xdebug.h. You need to rebuild your
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* software executable.
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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 jz 07/30/10 First release
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* 2.01a rkv 01/28/11 Modified function prototype of
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* XAxiCdma_SimplePollExample to function taking only one
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* arguments i.e. device id.
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* 2.01a srt 03/06/12 Modified Flushing and Invalidation of Caches to fix CRs
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* 648103, 648701.
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* </pre>
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*
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****************************************************************************/
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#include "xaxicdma.h"
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#include "xdebug.h"
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#include "xil_cache.h"
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#include "xparameters.h"
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#if (!defined(DEBUG))
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extern void xil_printf(const char *format, ...);
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#endif
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/******************** Constant Definitions **********************************/
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/*
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* The following constants map to the XPAR parameters created in the
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* xparameters.h file. They are defined here such that a user can easily
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* change all the needed parameters in one place.
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*/
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#ifndef TESTAPP_GEN
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#define DMA_CTRL_DEVICE_ID XPAR_AXICDMA_0_DEVICE_ID
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#endif
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#define BUFFER_BYTESIZE 64 /* Length of the buffers for DMA
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* transfer
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*/
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#define NUMBER_OF_TRANSFERS 4 /* Number of transfers to do in this
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* test
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*/
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#define RESET_LOOP_COUNT 10 /* Number of times to check reset is
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* done
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*/
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/**************************** Type Definitions *******************************/
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/***************** Macros (Inline Functions) Definitions *********************/
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/************************** Function Prototypes ******************************/
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static int DoSimplePollTransfer(XAxiCdma *InstancePtr, int Length, int Retries);
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static int CheckData(u8 *SrcPtr, u8 *DestPtr, int Length);
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int XAxiCdma_SimplePollExample(u16 DeviceId);
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/************************** Variable Definitions *****************************/
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static XAxiCdma AxiCdmaInstance; /* Instance of the XAxiCdma */
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/* Source and Destination buffer for DMA transfer.
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*/
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volatile static u8 SrcBuffer[BUFFER_BYTESIZE] __attribute__ ((aligned (64)));
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volatile static u8 DestBuffer[BUFFER_BYTESIZE] __attribute__ ((aligned (64)));
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/* Shared variables used to test the callbacks.
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*/
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volatile static int Done = 0; /* Dma transfer is done */
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volatile static int Error = 0; /* Dma Error occurs */
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/*****************************************************************************/
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/*
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* The entry point for this example. It invokes the example function,
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* and reports the execution status.
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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 example finishes successfully
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* - XST_FAILURE if example fails.
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*
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* @note None.
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*
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******************************************************************************/
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#ifndef TESTAPP_GEN
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int main()
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{
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int Status;
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xil_printf("\r\n--- Entering main() --- \r\n");
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/* Run the poll example for simple transfer */
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Status = XAxiCdma_SimplePollExample(DMA_CTRL_DEVICE_ID);
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if (Status != XST_SUCCESS) {
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xil_printf("AxiCdma_SimplePollExample: Failed\r\n");
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return XST_FAILURE;
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}
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xil_printf("AxiCdma_SimplePollExample: Passed\r\n");
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xil_printf("--- Exiting main() --- \r\n");
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return XST_SUCCESS;
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}
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#endif
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/*****************************************************************************/
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/**
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* The example to do the simple transfer through polling. The constant
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* NUMBER_OF_TRANSFERS defines how many times a simple transfer is repeated.
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*
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* @param DeviceId is the Device Id of the XAxiCdma instance
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*
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* @return
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* - XST_SUCCESS if example finishes successfully
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* - XST_FAILURE if error occurs
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*
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* @note If the hardware build has problems with interrupt,
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* then this function hangs
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*
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*
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******************************************************************************/
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int XAxiCdma_SimplePollExample(u16 DeviceId)
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{
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XAxiCdma_Config *CfgPtr;
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int Status;
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int SubmitTries = 10; /* try 10 times on submission */
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int Tries = NUMBER_OF_TRANSFERS;
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int Index;
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/* Initialize the XAxiCdma device.
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*/
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CfgPtr = XAxiCdma_LookupConfig(DeviceId);
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if (!CfgPtr) {
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return XST_FAILURE;
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}
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Status = XAxiCdma_CfgInitialize(&AxiCdmaInstance, CfgPtr,
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CfgPtr->BaseAddress);
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if (Status != XST_SUCCESS) {
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return XST_FAILURE;
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}
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/* Disable interrupts, we use polling mode
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*/
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XAxiCdma_IntrDisable(&AxiCdmaInstance, XAXICDMA_XR_IRQ_ALL_MASK);
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for (Index = 0; Index < Tries; Index++) {
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Status = DoSimplePollTransfer(&AxiCdmaInstance,
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BUFFER_BYTESIZE, SubmitTries);
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if (Status != XST_SUCCESS) {
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return XST_FAILURE;
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}
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}
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/* Test finishes successfully
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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 does one simple transfer in polled mode
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*
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* @param InstancePtr is a pointer to the XAxiCdma instance
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* @param Length is the transfer length
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* @param Retries is how many times to retry on submission
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*
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* @return
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* - XST_SUCCESS if transfer is successful
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* - XST_FAILURE if either the transfer fails or the data has
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* error
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*
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* @note None
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*
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******************************************************************************/
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static int DoSimplePollTransfer(XAxiCdma *InstancePtr, int Length, int Retries)
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{
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int Index;
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u8 *SrcPtr;
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u8 *DestPtr;
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int Status;
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/* Initialize the source buffer bytes with a pattern and the
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* the destination buffer bytes to zero
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*/
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SrcPtr = (u8 *)SrcBuffer;
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DestPtr = (u8 *)DestBuffer;
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for (Index = 0; Index < BUFFER_BYTESIZE; Index++) {
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SrcPtr[Index] = Index & 0xFF;
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DestPtr[Index] = 0;
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}
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/* Flush the SrcBuffer before the DMA transfer, in case the Data Cache
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* is enabled
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*/
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Xil_DCacheFlushRange((u32)&SrcBuffer, Length);
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/* Try to start the DMA transfer
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*/
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while (Retries) {
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Retries -= 1;
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Status = XAxiCdma_SimpleTransfer(InstancePtr, (u32)SrcBuffer,
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(u32)DestBuffer, Length, NULL, NULL);
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if (Status == XST_SUCCESS) {
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break;
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}
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}
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/* Return failure if failed to submit the transfer
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*/
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if (!Retries) {
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return XST_FAILURE;
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}
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/* Wait until the DMA transfer is done
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*/
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while (XAxiCdma_IsBusy(InstancePtr)) {
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/* Wait */
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}
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/* If the hardware has errors, this example fails
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* This is a poll example, no interrupt handler is involved.
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* Therefore, error conditions are not cleared by the driver.
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*/
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Error = XAxiCdma_GetError(InstancePtr);
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if (Error != 0x0) {
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int TimeOut = RESET_LOOP_COUNT;
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/* Need to reset the hardware to restore to the correct state
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*/
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XAxiCdma_Reset(InstancePtr);
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while (TimeOut) {
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if (XAxiCdma_ResetIsDone(InstancePtr)) {
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break;
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}
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TimeOut -= 1;
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}
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/* Reset has failed, print a message to notify the user
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*/
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return XST_FAILURE;
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}
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/* Transfer completes successfully, check data
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*/
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Status = CheckData(SrcPtr, DestPtr, Length);
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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 checks that two buffers have the same data
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*
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* @param SrcPtr is the source buffer
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* @param DestPtr is the destination buffer
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* @param Length is the length of the buffer to check
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*
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* @return
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* - XST_SUCCESS if the two buffer matches
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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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static int CheckData(u8 *SrcPtr, u8 *DestPtr, int Length)
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{
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int Index;
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/* Invalidate the DestBuffer before receiving the data, in case the
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* Data Cache is enabled
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*/
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Xil_DCacheInvalidateRange((u32)DestPtr, Length);
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for (Index = 0; Index < Length; Index++) {
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if ( DestPtr[Index] != SrcPtr[Index]) {
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return XST_FAILURE;
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}
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}
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return XST_SUCCESS;
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}
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