Reading a serial port in c

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Error reading hex value from serial port. I've got the program on the microcontroller working flawlessly with minicom at 8N1. The program on the microcontroller send out a short text string, and then will listen on the serial port and repeat back any thing you type on it This is declared in the middle of the code, so it isn't actually C code not C89 code at least.

It's a pointer not pointing anywhere, so dereferencing it is bad news for you. Since you're reading only 1 char at a time. Assuming the compiler even left this code in, it would take very little time to run. Page 1 of 2 1 2 Last Jump to page:. Similar Threads reading and writing-serial port. Replies: 4 Last Post: , PM. Replies: 2 Last Post: , AM. Serial port reading By gargamel in forum C Programming. Replies: 1 Last Post: , PM. Replies: 4 Last Post: , AM. All times are GMT After this you have to set the values using SetCommTimeouts function.

Writing data to the opened serial port is accomplished by the WriteFile function. Microcontroller Interface. The Controller waits for a character to be received and lights up the corresponding LED. The code for interfacing MSP is available in the Github repo. We have also included code for.

The connection setup is similar to the MSP Here is the screen shot of the Program writing into serial port of Windows 7 Computer. Please note that i have changed the names of the C files in the latest release. Here is the screen shot of the Program writing into serial port of Windows 10Computer. One way to do that is to use polling where the ReadFile continuously reads from the serial port and checks for any received characters.

Other way is to setup an event and let windows notify us when a character is received. We are going to use the second method here, following are the steps. Create an Event for a particular action like character reception, change in modem lines etc using SetCommMask function. Ask windows to wait for the event set by SetCommMask function using WaitCommEvent and notify us when the condition happens.

Call ReadFile to read the received data from the Serial port. Functions used are. SetCommMask is used to set the events to be monitored for a communication device. Codes running on Windows 7 PC.

Codes running on Windows 10 PC. Check out our next section,.