text: /******************************************************************************
  * Copyright (C) 2010 - 2021 Xilinx, Inc.  All rights reserved.
  * SPDX-License-Identifier: MIT
  ******************************************************************************/
  
  /*****************************************************************************/
  /**
  * @file xiicps_polled_master_example.c
  *
  * A design example of using the device in polled mode as master.
  *
  * The example uses buffer size 132. Please set the send buffer of the
  * Aardvark device to be continuous 64 bytes from 0x00 to 0x3F.
   *
   * <pre> MODIFICATION HISTORY:
   *
   * Ver   Who Date     Changes
   * ----- --- -------- -----------------------------------------------
   * 1.00a jz  01/30/10 First release
   *
   * </pre>
   *
   ****************************************************************************/
  
  /***************************** Include Files **********************************/
  #include "xparameters.h"
  #include "xiicps.h"
  #include "xil_printf.h"
  
  /************************** Constant Definitions ******************************/
  
  /*
   * The following constants map to the XPAR parameters created in the
   * xparameters.h file. They are defined here such that a user can easily
   * change all the needed parameters in one place.
   */
  #ifndef SDT
  #define IIC_DEVICE_ID		XPAR_XIICPS_0_DEVICE_ID
  #endif
  
  /*
   * The slave address to send to and receive from.
   */
  #define IIC_SLAVE_ADDR		0x55
  #define IIC_SCLK_RATE		100000
  
  /*
   * The following constant controls the length of the buffers to be sent
   * and received with the IIC.
   */
  #define TEST_BUFFER_SIZE	132
  
  /**************************** Type Definitions ********************************/
  
  
  /************************** Function Prototypes *******************************/
  
  #ifndef SDT
  int IicPsMasterPolledExample(u16 DeviceId);
  #else
  int IicPsMasterPolledExample(UINTPTR BaseAddress);
  #endif
  /************************** Variable Definitions ******************************/
  
  XIicPs Iic;		/**< Instance of the IIC Device */
  
  /*
   * The following buffers are used in this example to send and receive data
   * with the IIC.
   */
  u8 SendBuffer[TEST_BUFFER_SIZE];    /**< Buffer for Transmitting Data */
  u8 RecvBuffer[TEST_BUFFER_SIZE];    /**< Buffer for Receiving Data */
  
  
  /******************************************************************************/
  /**
  *
  * Main function to call the polled master example.
  *
  *
  * @return	XST_SUCCESS if successful, XST_FAILURE if unsuccessful.
  *
  * @note		None.
  *
  *******************************************************************************/
  int main(void)
  {
  	int Status;
  
  	xil_printf("IIC Master Polled Example Test \r\n");
  
  	/*
  	 * Run the Iic polled example in master mode, specify the Device
  	 * ID that is specified in xparameters.h.
  	 */
  #ifndef SDT
  	Status = IicPsMasterPolledExample(IIC_DEVICE_ID);
  #else
  	Status = IicPsMasterPolledExample(XPAR_XIICPS_0_BASEADDR);
  #endif
  	if (Status != XST_SUCCESS) {
  		xil_printf("IIC Master Polled Example Test Failed\r\n");
  		return XST_FAILURE;
  	}
  
  	xil_printf("Successfully ran IIC Master Polled Example Test\r\n");
  	return XST_SUCCESS;
  }
  
  /*****************************************************************************/
  /**
  *
  * This function sends data and expects to receive data from slave as modular
  * of 64.
  *
  * This function uses interrupt-driven mode of the device.
  *
  * @param	DeviceId is the Device ID of the IicPs Device and is the
  *		XPAR_<IICPS_instance>_DEVICE_ID value from xparameters.h
  *
  * @return	XST_SUCCESS if successful, otherwise XST_FAILURE.
  *
  * @note		None.
  *
  *******************************************************************************/
  #ifndef SDT
  int IicPsMasterPolledExample(u16 DeviceId)
  #else
  int IicPsMasterPolledExample(UINTPTR BaseAddress)
  #endif
  {
  	int Status;
  	XIicPs_Config *Config;
  	int Index;
  
  	/*
  	 * Initialize the IIC driver so that it's ready to use
  	 * Look up the configuration in the config table,
  	 * then initialize it.
  	 */
  #ifndef SDT
  	Config = XIicPs_LookupConfig(DeviceId);
  #else
  	Config = XIicPs_LookupConfig(BaseAddress);
  #endif
  	if (NULL == Config) {
  		return XST_FAILURE;
  	}
  
  	Status = XIicPs_CfgInitialize(&Iic, Config, Config->BaseAddress);
  	if (Status != XST_SUCCESS) {
  		return XST_FAILURE;
  	}
  
  	/*
  	 * Perform a self-test to ensure that the hardware was built correctly.
  	 */
  	Status = XIicPs_SelfTest(&Iic);
  	if (Status != XST_SUCCESS) {
  		return XST_FAILURE;
  	}
  
  	/*
  	 * Set the IIC serial clock rate.
  	 */
  	XIicPs_SetSClk(&Iic, IIC_SCLK_RATE);
  
  	/*
  	 * Initialize the send buffer bytes with a pattern to send and the
  	 * the receive buffer bytes to zero to allow the receive data to be
  	 * verified.
  	 */
  	for (Index = 0; Index < TEST_BUFFER_SIZE; Index++) {
  		SendBuffer[Index] = (Index % TEST_BUFFER_SIZE);
  		RecvBuffer[Index] = 0;
  	}
  
  	/*
  	 * Send the buffer using the IIC and ignore the number of bytes sent
  	 * as the return value since we are using it in interrupt mode.
  	 */
  	Status = XIicPs_MasterSendPolled(&Iic, SendBuffer,
  			 TEST_BUFFER_SIZE, IIC_SLAVE_ADDR);
  	if (Status != XST_SUCCESS) {
  		return XST_FAILURE;
  	}
  
  	/*
  	 * Wait until bus is idle to start another transfer.
  	 */
  	while (XIicPs_BusIsBusy(&Iic)) {
  		/* NOP */
  	}
  
  	Status = XIicPs_MasterRecvPolled(&Iic, RecvBuffer,
  			  TEST_BUFFER_SIZE, IIC_SLAVE_ADDR);
  	if (Status != XST_SUCCESS) {
  		return XST_FAILURE;
  	}
  
  	/*
  	 * Verify received data is correct.
  	 */
  	 for(Index = 0; Index < TEST_BUFFER_SIZE; Index ++) {
  
  		/* Aardvark as slave can only set 64 bytes for output */
  		if (RecvBuffer[Index] != Index % 64) {
  			return XST_FAILURE;
  		}
  	}
  
  	return XST_SUCCESS;
  }
  