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******************************************************************************/
/******************************************************************************/
/**
* @file xspi_low_level_example.c
*
* This file contains a design example using the low-level driver of the
* SPI driver (XSpi). These macros are found in xspi_l.h. A simple loopback
* test is done within an SPI device in polled mode. This example works only with
* 8-bit wide data transfers.
*
* @note
* This example works only with 8-bit wide data transfers in standard SPI mode.
* This example will not work if the axi_qspi device is confiured in dual/quad
* modes.
*
* To make this example work for 16 bit transfers change u8 Buffer[BUFFER_SIZE]
* to u16 Buffer[BUFFER_SIZE]. The SPI Core should aslo be configured for 16 bit
* access during the build time.
*
* To make this example work for 32 bit transfers change u8 Buffer[BUFFER_SIZE]
* to u32 Buffer[BUFFER_SIZE]. The SPI Core should aslo be configured for 32 bit
* access during the build time.
*
*
*<pre>
* MODIFICATION HISTORY:
*
* Ver Who Date Changes
* ----- ---- -------- ----------------------------------------------------------
* 1.00b rpm 04/24/02 First release
* 1.00b jhl 09/10/02 Added code to ensure it works with a fast processor.
* 1.00b sv 05/16/05 Minor changes to comply to Doxygen and coding guidelines
* 3.00a ktn 10/28/09 Converted all register accesses to 32 bit access.
* 3.02a sdm 05/04/11 Added a note about dual/quad modes in axi_qspi.
*
*</pre>
*******************************************************************************/
/***************************** Include Files **********************************/
#include "xparameters.h"
#include "xstatus.h"
#include "xspi_l.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 SPI_BASEADDR XPAR_SPI_0_BASEADDR
/**************************** Type Definitions ********************************/
/***************** Macros (Inline Functions) Definitions **********************/
/************************** Function Prototypes *******************************/
int XSpi_LowLevelExample(u32 BaseAddress);
/************************** Variable Definitions ******************************/
/*
* This is the size of the buffer to be transmitted/received in this example.
*/
#define BUFFER_SIZE 32
/*
* The buffer used for Transmission/Reception of the SPI test data
*/
u16 Buffer[BUFFER_SIZE];
/******************************************************************************/
/**
* This function is the main function of the SPI Low Level example.
*
* @param None
*
* @return XST_SUCCESS to indicate success, else XST_FAILURE to indicate
* Failure.
*
* @note None
*
*******************************************************************************/
int main(void)
{
int Status;
/*
* Run the example, specify the Base Address that is generated in
* xparameters.h
*/
Status = XSpi_LowLevelExample(SPI_BASEADDR);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
return XST_SUCCESS;
}
/******************************************************************************/
/**
*
* This function does a simple loopback test within an SPI device.
*
* @param BaseAddress is the BaseAddress of the SPI device
*
* @return XST_SUCCESS if successful, XST_FAILURE if unsuccessful
*
* @note None
*
*******************************************************************************/
int XSpi_LowLevelExample(u32 BaseAddress)
{
u32 Control;
int NumBytesSent = 0;
int NumBytesRcvd = 0;
u32 Count;
/*
* Set up the device in loopback mode and enable master mode.
*/
Control = XSpi_ReadReg(BaseAddress, XSP_CR_OFFSET);
Control |= (XSP_CR_LOOPBACK_MASK | XSP_CR_MASTER_MODE_MASK);
XSpi_WriteReg(BaseAddress, XSP_CR_OFFSET, Control);
/*
* Initialize the buffer with some data.
*/
for (Count = 0; Count < BUFFER_SIZE; Count++) {
Buffer[Count] = Count;
}
/*
* Fill up the transmitter with data, assuming the receiver can hold
* the same amount of data.
*/
while ((XSpi_ReadReg(BaseAddress, XSP_SR_OFFSET) &
XSP_SR_TX_FULL_MASK) == 0) {
XSpi_WriteReg((BaseAddress), XSP_DTR_OFFSET,
Buffer[NumBytesSent++]);
}
/*
* Enable the device.
*/
Control = XSpi_ReadReg(BaseAddress, XSP_CR_OFFSET);
Control |= XSP_CR_ENABLE_MASK;
Control &= ~XSP_CR_TRANS_INHIBIT_MASK;
XSpi_WriteReg(BaseAddress, XSP_CR_OFFSET, Control);
/*
* Initialize the buffer with zeroes so that it can be used to receive
* data.
*/
for (Count = 0; Count < BUFFER_SIZE; Count++) {
Buffer[Count] = 0x0;
}
/*
* Wait for the transmit FIFO to transition to empty before checking
* the receive FIFO, this prevents a fast processor from seeing the
* receive FIFO as empty
*/
while (!(XSpi_ReadReg(BaseAddress, XSP_SR_OFFSET) &
XSP_SR_TX_EMPTY_MASK));
/*
* Transmitter is full, now receive the data just looped back until
* the receiver is empty.
*/
while ((XSpi_ReadReg(BaseAddress, XSP_SR_OFFSET) &
XSP_SR_RX_EMPTY_MASK) == 0) {
Buffer[NumBytesRcvd++] = XSpi_ReadReg((BaseAddress),
XSP_DRR_OFFSET);
}
/*
* If no data was sent or the data that was sent was not received,
* then return an error
*/
if ((NumBytesSent != NumBytesRcvd) || (NumBytesSent == 0)) {
return XST_FAILURE;
}
return XST_SUCCESS;
}