I started from a basic application which read serial port, but it's not working as it's supposed to work. I tested my code in Linux machine, it's work flowless, but in windows, it's not reading serial port.
In Linux, when I run the code, it listens until i close the program. Whatever I sent from serial port, It directly print to the terminal. But in windows, it just waits and doesn't read anything. I also set my buffer to smaller but that's also didn't work. Then it's idle without reading anything.
On the other hand, I want to measure the time elapsed during writing and reading. But when I try with my code it returns ms which seems wrong. I created 16kb of data with a for-loop. I suppose to take more than 1sec but my code returns 0ms.
I think, I don't know how to make it properly. Also i need this kind of stuff also for reading. You should check whether your open call is successful. Then you should also check for errors in your code. Some variables that are worth mentioning here are the byte mac[] , the IPAddress timeSrvr , and the byte messageBuffer[48].
The byte array mac[] contains the MAC address that will be assigned for the ethernet shield. This is a unique identifier for the shield in the network. The server IP we will use is After populating the setup function, we will create code inside loop to display the current date and time on the serial monitor.
To make our code easy to manage, we will create functions to help us in the process of requesting, parsing, and displaying time data from the NTP server. The function digitalClockDisplay and its helper function printDigits uses the Time library functions hour , minute , second , day , month , and year to get parts of the time data and send it to the serial monitor for display. To communicate with the NTP server, we first need to send a request packet.
We will initialize all 48 bytes to zero by using the function memset. Then, we will assign values to selected indices of the array to complete a request packet.
The helper function sendRequest handles the creation of the request packet and sends it to the NTP server. After sending the request, we wait for a response to arrive. The response can be longer than 48 bytes but we will only need the first 48 bytes. As for our code, if no response arrives after milliseconds, our function will print an error message to the serial monitor and terminate with return 0;.
This function returns the number of bytes received and is waiting to be read. The response packet contains a timestamp at byte 40 to This timestamp is the number of seconds elapsed since NTP epoch 01 January To get the current UTC time, we just need to subtract the seconds elapsed since the NTP epoch from the timestamp received.
The Time library uses this value to calculate the hours, minutes, seconds, day, month, and year in UTC to be displayed to the serial monitor. If you are looking for non-intrusive software-based serial port monitoring solution to view serial protocol packets, this Free Serial Port Analyser is exactly what you need. This COM port monitoring tool requires no additional hardware and allows you to facilitate serial application development, debug protocol errors, view and test device failures.
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