Zynq中UART

UART模块的结构图

主程序流程：

UART初始化→设置UART模式→设置数据格式→设置中断→发送UART数据

程序设计如下：

Config =XUartPs_LookupConfig(UART_DEVICE_ID);

if (NULL == Config) {

return XST_FAILURE;

}

Status= XUartPs_CfgInitialize(&Uart_PS, Config, Config->BaseAddress);

if (Status != XST_SUCCESS) {

return XST_FAILURE;

}

/* 配置UART模式

XUartPs_SetOperMode(&Uart_PS,XUARTPS_OPER_MODE_NORMAL);

/* 配置UART数据格式波特率：115200, 数据：8bits, 无校验, 1个停止位*/

XUartPs_SetDataFormat(&Uart_PS,&UartFormat) ;

/*设置中断

XUartPs_SetFifoThreshold(&Uart_PS,1);

/*使能接收FIFO触发电平和FIFO空中断

XUartPs_SetInterruptMask(&Uart_PS,XUARTPS_IXR_RXOVR|XUARTPS_IXR_RXEMPTY);

SetupInterruptSystem(&IntcInstPtr,&Uart_PS, UART_INT_IRQ_ID) ;

//发送数据

SendBufferPtr =TxString ;

SendByteNum= sizeof(TxString) ;

UartPsSend(&Uart_PS,SendBufferPtr, SendByteNum);

/* Block receiving the buffer. */

ReceivedCount= 0;

while (ReceivedCount < TEST_BUFFER_SIZE) {

ReceivedCount+=

XUartPs_Recv(&Uart_PS,&RecvBuffer[ReceivedCount],

(TEST_BUFFER_SIZE - ReceivedCount));

}

附录：

//UART发送数据

int UartPsSend(XUartPs *InstancePtr, u8 *BufferPtr, u32 NumBytes)

{

u32 SentCount = 0U;

/* Setup the buffer parameters */

InstancePtr->SendBuffer.RequestedBytes = NumBytes;

InstancePtr->SendBuffer.RemainingBytes = NumBytes;

InstancePtr->SendBuffer.NextBytePtr = BufferPtr;

while (InstancePtr->SendBuffer.RemainingBytes > SentCount)

{

/* Fill the FIFO from the buffer */

if (!XUartPs_IsTransmitFull(InstancePtr->Config.BaseAddress))

{

XUartPs_WriteReg(InstancePtr->Config.BaseAddress,

XUARTPS_FIFO_OFFSET,

((u32)InstancePtr->SendBuffer.

NextBytePtr[SentCount]));

/* Increment the send count. */

SentCount++;

}

}

/* Update the buffer to reflect thebytes that were sent from it */

InstancePtr->SendBuffer.NextBytePtr += SentCount;

InstancePtr->SendBuffer.RemainingBytes -= SentCount;

return SentCount;

}

//UART接收数据

int UartPsRev(XUartPs *InstancePtr, u8 *BufferPtr, u32 NumBytes)

{

u32 ReceivedCount = 0;

u32 CsrRegister;

/* Setup the buffer parameters */

InstancePtr->ReceiveBuffer.RequestedBytes = NumBytes;

InstancePtr->ReceiveBuffer.RemainingBytes = NumBytes;

InstancePtr->ReceiveBuffer.NextBytePtr = BufferPtr;

/*

* Read the Channel Status Register todetermine if there is any data in

* the RX FIFO

*/

CsrRegister= XUartPs_ReadReg(InstancePtr->Config.BaseAddress,

XUARTPS_SR_OFFSET);

/*

* Loop until there is no more data in RX FIFOor the specified

* number of bytes has been received

*/

while((ReceivedCount < InstancePtr->ReceiveBuffer.RemainingBytes)&&

(((CsrRegister& XUARTPS_SR_RXEMPTY) == (u32)0)))

{

InstancePtr->ReceiveBuffer.NextBytePtr[ReceivedCount] =

XUartPs_ReadReg(InstancePtr->Config.BaseAddress,XUARTPS_FIFO_OFFSET);

ReceivedCount++;

CsrRegister= XUartPs_ReadReg(InstancePtr->Config.BaseAddress,

XUARTPS_SR_OFFSET);

}

InstancePtr->is_rxbs_error = 0;

/*

* Update the receive buffer to reflect thenumber of bytes just

* received

*/

if(InstancePtr->ReceiveBuffer.NextBytePtr != NULL){

InstancePtr->ReceiveBuffer.NextBytePtr += ReceivedCount;

}

InstancePtr->ReceiveBuffer.RemainingBytes -= ReceivedCount;

return ReceivedCount;

}