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*
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******************************************************************************/
/****************************************************************************/
/**
*
* @file xuartps_polled_example.c
*
* This file contains an example using the XUartPs driver in polled mode.
*
* This function sends data and expects to receive the data thru the device
* using the local loopback mode.
*
* @note
* If the device does not work properly, the example may hang.
*
* MODIFICATION HISTORY:
* <pre>
* Ver Who Date Changes
* ----- ------ -------- -----------------------------------------------
* 1.00a drg/jz 01/13/10 First Release
* 1.03a sg 07/16/12 Modified the device ID to use the first Device Id
* Removed the printf at the start of the main
* </pre>
******************************************************************************/
/***************************** Include Files *********************************/
#include "xparameters.h"
#include "xuartps.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.
*/
#define UART_DEVICE_ID XPAR_XUARTPS_0_DEVICE_ID
/*
* The following constant controls the length of the buffers to be sent
* and received with the device, this constant must be 32 bytes or less since
* only as much as FIFO size data can be sent or received in polled mode.
*/
#define TEST_BUFFER_SIZE 32
/**************************** Type Definitions *******************************/
/***************** Macros (Inline Functions) Definitions *********************/
/************************** Function Prototypes ******************************/
int UartPsPolledExample(u16 DeviceId);
/************************** Variable Definitions *****************************/
XUartPs Uart_PS; /* Instance of the UART Device */
/*
* The following buffers are used in this example to send and receive data
* with the UART.
*/
static u8 SendBuffer[TEST_BUFFER_SIZE]; /* Buffer for Transmitting Data */
static u8 RecvBuffer[TEST_BUFFER_SIZE]; /* Buffer for Receiving Data */
/*****************************************************************************/
/**
*
* Main function to call the Uart Polled mode example.
*
* @param None
*
* @return XST_SUCCESS if succesful, otherwise XST_FAILURE
*
* @note None
*
******************************************************************************/
#ifndef TESTAPP_GEN
int main(void)
{
int Status;
/*
* Run the Uart_PS polled example , specify the the Device ID that is
* generated in xparameters.h
*/
Status = UartPsPolledExample(UART_DEVICE_ID);
if (Status != XST_SUCCESS) {
xil_printf("UART Polled Mode Example Test Failed\r\n");
return XST_FAILURE;
}
xil_printf("Successfully ran UART Polled Mode Example Test\r\n");
return XST_SUCCESS;
}
#endif
/*****************************************************************************/
/**
*
* This function does a minimal test on the XUartPs device in polled mode.
*
* This function sends data and expects to receive the data thru the UART
* using the local loopback mode.
*
*
* @param DeviceId is the unique device id from hardware build.
*
* @return XST_SUCCESS if successful, XST_FAILURE if unsuccessful
*
* @note
* This function polls the UART, it may hang if the hardware is not
* working correctly.
*
****************************************************************************/
int UartPsPolledExample(u16 DeviceId)
{
int Status;
XUartPs_Config *Config;
unsigned int SentCount;
unsigned int ReceivedCount;
u16 Index;
u32 LoopCount = 0;
/*
* Initialize the UART driver so that it's ready to use.
* Look up the configuration in the config table, then initialize it.
*/
Config = XUartPs_LookupConfig(DeviceId);
if (NULL == Config) {
return XST_FAILURE;
}
Status = XUartPs_CfgInitialize(&Uart_PS, Config, Config->BaseAddress);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Check hardware build.
*/
Status = XUartPs_SelfTest(&Uart_PS);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Use local loopback mode.
*/
XUartPs_SetOperMode(&Uart_PS, XUARTPS_OPER_MODE_LOCAL_LOOP);
/*
* Initialize the send buffer bytes with a pattern and zero out
* the receive buffer.
*/
for (Index = 0; Index < TEST_BUFFER_SIZE; Index++) {
SendBuffer[Index] = '0' + Index;
RecvBuffer[Index] = 0;
}
/*
* Block sending the buffer.
*/
SentCount = XUartPs_Send(&Uart_PS, SendBuffer, TEST_BUFFER_SIZE);
if (SentCount != TEST_BUFFER_SIZE) {
return XST_FAILURE;
}
/*
* Wait while the UART is sending the data so that we are guaranteed
* to get the data the 1st time we call receive, otherwise this function
* may enter receive before the data has arrived
*/
while (XUartPs_IsSending(&Uart_PS)) {
LoopCount++;
}
/*
* Block receiving the buffer.
*/
ReceivedCount = 0;
while (ReceivedCount < TEST_BUFFER_SIZE) {
ReceivedCount +=
XUartPs_Recv(&Uart_PS, &RecvBuffer[ReceivedCount],
(TEST_BUFFER_SIZE - ReceivedCount));
}
/*
* Check the receive buffer against the send buffer and verify the
* data was correctly received
*/
for (Index = 0; Index < TEST_BUFFER_SIZE; Index++) {
if (SendBuffer[Index] != RecvBuffer[Index]) {
return XST_FAILURE;
}
}
/*
* Restore to normal mode.
*/
XUartPs_SetOperMode(&Uart_PS, XUARTPS_OPER_MODE_NORMAL);
return XST_SUCCESS;
}