xuartps_hw.c

自学ZedBoard：使用IP通过ARM PS访问FPGA（源代码）

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/****************************************************************************/
/**
*
* @file xuartps_hw.c
*
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who    Date	Changes
* ----- ------ -------- ----------------------------------------------
* 1.00	drg/jz 01/12/10 First Release
* </pre>
*
*****************************************************************************/

/***************************** Include Files ********************************/
#include "xuartps_hw.h"

/***************** Macros (Inline Functions) Definitions ********************/


/************************** Function Prototypes ******************************/


/************************** Variable Definitions *****************************/

/****************************************************************************/
/**
*
* This function sends one byte using the device. This function operates in
* polled mode and blocks until the data has been put into the TX FIFO register.
*
* @param	BaseAddress contains the base address of the device.
* @param	Data contains the byte to be sent.
*
* @return	None.
*
* @note		None.
*
*****************************************************************************/
void XUartPs_SendByte(u32 BaseAddress, u8 Data)
{
		/*
		 * Wait until there is space in TX FIFO
		 */
		while (XUartPs_IsTransmitFull(BaseAddress));

		/*
		 * Write the byte into the TX FIFO
		 */
		XUartPs_WriteReg(BaseAddress, XUARTPS_FIFO_OFFSET, Data);
}

/****************************************************************************/
/**
*
* This function receives a byte from the device. It operates in polled mode
* and blocks until a byte has received.
*
* @param	BaseAddress contains the base address of the device.
*
* @return	The data byte received.
*
* @note		None.
*
*****************************************************************************/
u8 XUartPs_RecvByte(u32 BaseAddress)
{
		/*
		 * Wait until there is data
		 */
		while (!XUartPs_IsReceiveData(BaseAddress));

		/*
		 * Return the byte received
		 */
		return (XUartPs_ReadReg(BaseAddress, XUARTPS_FIFO_OFFSET));
}