我正在使用ZedBoard，它有一个Zynq-7000全可编程SoC。我正在尝试提供的示例之一(可以从 Xilinx SDK 导入)，它称为xuartps_intr_example.c
此文件包含一个 UART 驱动程序，该驱动程序在中断模式下使用。应用程序发送数据，并期望使用本地环回模式通过设备接收相同的数据
我想调整该代码，以便我可以将数据从终端或实现串行通信的某种程序发送到我的 ZedBoard。我尝试使用XUartPs_Recv函数从外部接收数据，并从PC中的不同终端发送数据(通过在Xilinx SDK中禁用控制台，否则无法访问串口)，但开发板没有收到任何内容。另一方面，将数据从 ZedBoard 发送到我的 PC 工作正常，我可以在不同的终端中看到来自开发板的消息。
我附上了我无法理解的源代码，我认为这给我带来了问题。我的问题前面有一个哈希符号：
XUartPs_SetInterruptMask(UartInstPtr, IntrMask);
XUartPs_SetOperMode(UartInstPtr, XUARTPS_OPER_MODE_LOCAL_LOOP);
#WHAT IS LOCAL LOOPBACK MODE?? DOES THIS PREVENT THE BOARD FROM RECEIVING
DATA COMING FROM MY PC?
/*
* Set the receiver timeout. If it is not set, and the last few bytes
* of data do not trigger the over-water or full interrupt, the bytes
* will not be received. By default it is disabled.
*
* The setting of 8 will timeout after 8 x 4 = 32 character times.
* Increase the time out value if baud rate is high, decrease it if
* baud rate is low.
*/
XUartPs_SetRecvTimeout(UartInstPtr, 8);
/*
* Initialize the send buffer bytes with a pattern 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 % 26) + 'A';
RecvBuffer[Index] = 0;
}
/*
* Start receiving data before sending it since there is a loopback,
* ignoring the number of bytes received as the return value since we
* know it will be zero
*/
XUartPs_Recv(UartInstPtr, RecvBuffer, TEST_BUFFER_SIZE);
/*
* Send the buffer using the UART and ignore the number of bytes sent
* as the return value since we are using it in interrupt mode.
*/
XUartPs_Send(UartInstPtr, SendBuffer, TEST_BUFFER_SIZE);
#HOW DOES THIS ACTUALLY WORK? WHY DO WE START RECEIVING BEFORE WE SEND ANY
BYTES?
/*
* Wait for the entire buffer to be received, letting the interrupt
* processing work in the background, this function may get locked
* up in this loop if the interrupts are not working correctly.
*/
while (1) {
if ((TotalSentCount == TEST_BUFFER_SIZE) &&
(TotalReceivedCount == TEST_BUFFER_SIZE)) {
break;
}
}
/* Verify the entire receive buffer was successfully received */
for (Index = 0; Index < TEST_BUFFER_SIZE; Index++) {
if (RecvBuffer[Index] != SendBuffer[Index]) {
BadByteCount++;
}
}
/* Set the UART in Normal Mode */
XUartPs_SetOperMode(UartInstPtr, XUARTPS_OPER_MODE_NORMAL);
#WHAT DOES SETTING THE UART IN NORMAL MODE MEAN??
另外，我想知道是否可以通过SDK终端(Xilinx SDK)将数据发送到ZedBoard。目前，每一次尝试都没有成功。
提前谢谢你
基督教
要从PC终端接收ZedBoard上的数据，您必须处于正常运行模式，这是PS启动时的默认模式。查看 Zynq-7000 技术参考手册，第 598 页，图 19-7，了解 UART 操作模式。
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本地环回模式不会向外部应用程序发送任何内容，而只是将其发送的流循环回自身。
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我们实际上并没有开始接收数据。我们开始等待接收数据。
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正如@Cesar正确提到的，只需在代码开头将XUARTPS_OPER_MODE_LOCAL_LOOP更改为XUARTPS_OPER_MODE_NORMAL，您就可以开始了。正常环回模式将数据发送到外部应用程序。