Raspberry Pi UART program in C using termios receives garbage (Rx and Tx are connected directly)

Question

I have a simple program written in C which uses termios to send a basic string to the Raspberry Pi UART and attempts to read and output the response. The Rx and Tx pins on t

Answer 1

int wcount = write(fd, &str, strlen(str));
int rcount = read(fd, &buffer, sizeof(buffer));

In these lines, buffer/str are already pointers. You are passing a pointer to a pointer.

The lines should be:

int wcount = write(fd, str, strlen(str));
int rcount = read(fd, buffer, sizeof(buffer));