2c8f92039d
Added initial support Xilinx Embedded Software. Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
242 lines
8.2 KiB
C
Executable file
242 lines
8.2 KiB
C
Executable file
/******************************************************************************
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*
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* Copyright (C) 2008 - 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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* @file xspi_slave_polled_example.c
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*
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* This file contains a design example using the Spi driver (XSpi) and the SPI
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* device as a Slave, in polled mode.
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*
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* This example fills the Spi Tx buffer with the number of data bytes it expects
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* to receive from the master and then Spi device waits for an external master to
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* initiate the transfer. When the master initiates the transfer, the Spi device
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* receives data from the master and simultaneously sends the data in Tx buffer
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* to the master. Once the transfer is complete, this example prints the data
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* received from the master. The number of bytes to be received by the Spi slave
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* is defined by the constant BUFFER_SIZE in this file.
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*
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* The external SPI devices that are present on the Xilinx boards don't support
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* the Master functionality. This example has been tested with an off board
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* external SPI Master device and the Xilinx SPI device configured as a Slave.
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* This example has been tested for byte-wide SPI transfers.
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*
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* @note
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*
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* This example assumes that there is a STDIO device in the system.
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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 psk 09/05/08 First Release
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* 3.00a ktn 10/28/09 Converted all register accesses to 32 bit access.
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* Updated to use the HAL APIs/macros. Replaced call to
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* XSpi_Initialize API with XSpi_LookupConfig and
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* XSpi_CfgInitialize.
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*
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*</pre>
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******************************************************************************/
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/***************************** Include Files *********************************/
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#include "xparameters.h" /* XPAR parameters */
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#include "xspi.h" /* SPI device driver */
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#include "stdio.h"
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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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#define SPI_DEVICE_ID XPAR_SPI_0_DEVICE_ID
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/*
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* This is the size of the buffer to be transmitted/received in this example.
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*/
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#define BUFFER_SIZE 16
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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 SpiSlavePolledExample(XSpi *SpiInstancePtr, u16 SpiDeviceId);
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/************************** Variable Definitions *****************************/
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/*
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* The instances to support the device drivers are global such that they are
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* initialized to zero each time the program runs. They could be local but
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* should at least be static so that they are zeroed.
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*/
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static XSpi SpiInstance; /* The instance of the SPI device */
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/*
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* The following variables are used to read from the Spi device, these are
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* global to avoid having large buffers on the stack.
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*/
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u8 ReadBuffer[BUFFER_SIZE];
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u8 WriteBuffer[BUFFER_SIZE];
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/*
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* The following variable allows a test value to be added to the values that
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* are sent in reflection to the Master transmission such that unique values can
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* be generated to guarantee the transfer from Slave to Master is successful.
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*/
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int Test;
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/*****************************************************************************/
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/**
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*
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* Main function to call the Spi Slave example in polled mode.
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*
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* @param None
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*
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* @return XST_SUCCESS if successful, otherwise XST_FAILURE.
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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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int Status;
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/*
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* Run the Spi Slave polled example.
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*/
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Status = SpiSlavePolledExample(&SpiInstance, SPI_DEVICE_ID);
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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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*
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* This function does a minimal test on the Spi device and driver as a design
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* example. The purpose of this function is to illustrate the device slave
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* functionality in polled mode. This function receives data from a master and
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* prints the received data.
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*
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* @param SpiInstancePtr is a pointer to the instance of Spi component.
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*
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* @param SpiDeviceId is the Device ID of the Spi Device and is the
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* XPAR_<SPI_instance>_DEVICE_ID value from xparameters.h.
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*
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* @return XST_SUCCESS if successful, otherwise XST_FAILURE.
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*
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* @note This function contains an infinite loop such that if the Spi
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* device doesn't receive any data, it may never return.
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*
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******************************************************************************/
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int SpiSlavePolledExample(XSpi *SpiInstancePtr, u16 SpiDeviceId)
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{
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XSpi_Config *ConfigPtr;
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int Status;
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u32 Count;
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xil_printf("\r\nEntering the Spi Slave Polled Example.\r\n");
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xil_printf("Waiting for data from SPI master\r\n");
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/*
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* Initialize the SPI driver so that it's ready to use, specify the
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* device ID that is generated in xparameters.h.
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*/
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ConfigPtr = XSpi_LookupConfig(SpiDeviceId);
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if (ConfigPtr == NULL) {
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return XST_FAILURE;
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}
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Status = XSpi_CfgInitialize(SpiInstancePtr, ConfigPtr,
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ConfigPtr->BaseAddress);
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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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* The SPI device is a slave by default and the clock phase and polarity
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* have to be set according to its master. In this example, CPOL is set
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* to active low and CPHA is set to 1.
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*/
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Status = XSpi_SetOptions(SpiInstancePtr, XSP_CLK_PHASE_1_OPTION |
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XSP_CLK_ACTIVE_LOW_OPTION);
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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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* Start the SPI driver so that the device is enabled.
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*/
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XSpi_Start(SpiInstancePtr);
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/*
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* Disable Global interrupt to use polled mode operation.
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*/
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XSpi_IntrGlobalDisable(SpiInstancePtr);
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/*
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* Initialize the write buffer with pattern to write, initialize the
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* read buffer to zero so that it can be verified after the read.
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*/
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Test = 0xF0;
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for (Count = 0; Count < BUFFER_SIZE; Count++) {
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WriteBuffer[Count] = (u8)(Count + Test);
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ReadBuffer[Count] = 0;
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}
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/*
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* Prepare the data buffers for transmission and to send/receive data
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* when the SPI device is selected by a master.
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*/
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XSpi_Transfer(SpiInstancePtr, WriteBuffer, ReadBuffer, BUFFER_SIZE);
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/*
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* Print all the data received from the master so that it can be
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* compared with the data sent by the master.
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*/
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xil_printf("\r\nReceived data is:\r\n");
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for (Count = 0; Count < BUFFER_SIZE; Count++) {
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xil_printf("0x%x \r\n", ReadBuffer[Count]);
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}
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xil_printf("\r\nExiting the Spi Slave Polled Example.\r\n");
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return XST_SUCCESS;
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}
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