### Serial communication **<span style="font-size:16px;">Project name：</span>**<span style="font-size:16px;">serial communication.</span> **<span style="font-size:16px;">Specific requirements：</span>**<span style="font-size:16px;">realize serial port loopback test, send data from PC serial debug assistant, and send back to PC after the development board receives it.</span> **<span style="font-size:16px;">Implementation process：</span>** <span style="font-size:16px;"> 1.download the bit file to the development board and then switch the downloader to the USER_JTAG interface. (The downloader has integrated USB to serial function) As shown in the figure. </span>  <span style="font-size:16px;"> 2.Open the device manager to view the COM number of the serial port as shown in the following figure. </span>  <span style="font-size:16px;"> 3.Open the serial debugging tool to set the serial port, COM port set to the value viewed in the device manager, baud rate set to 9600, data bits set to 8, parity bit set to None, stop bit set to 1, and then click Open serial port, as shown in the figure below. </span>  <span style="font-size:16px;"> 4.Click Manual input to send, enter the content to be sent in the HEX format input or character format input box, click Send to see the sent content and the returned content in the display area, as shown in the following figure. </span>  ---