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1. On the host, activate the Cortex-M cross-development environment:

   Code Block
   bash-3.2$$ . ./ACTIVATE.sh -bash-3.2$$

2. Create a simple "Hello, world" C application:

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   [host] $ cd /tmp [host] $ vi test.c #include <stdio.h> int main(int argc, char *argv[]) { printf("Hello, i.MX RTxxxx\n"); return 0; }

3. Build the application for the Cortex-M target:

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   [host] $ ${CROSS_COMPILE_APPS}gcc -o test test.c

4. If you have no uuencode installed in your system, then install it:

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   [host] $ sudo apt-get install sharutils

5. Encode the application binary into an ASCII-only presentation so that the file can be transmitted over a serial line:

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   [host] $ uuencode test < test > test.encoded

   The uudecode application on the target (in order to convert the ASCII-only file back into the application binary) is provided with busybox by default in the rootfs project.

6. On the host, make sure that the serial port you use for the target console is configured for 115200 bps:

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   [host] $ stty -F /dev/ttyACM0 115200 raw -echo -echoe -echoctl -echok

7. If you have no picocom installed in your system, the install it:

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   [host] $ sudo apt-get install picocom

8. Start the target console:

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   [host] $ picocom -b 115200 /dev/ttyACM0

   From the target, run the following to read a file from the serial console:

   Code Block
   ~ # cat > /test.encoded < /dev/ttyLP0

9. On the host, exit the target console (Ctrl-A and then Ctrl-X in picocom).

10. On the host, send the encoded ASCII file to the serial port used for the target console:

    Code Block
    [host] $ cat /tmp/test.encoded > /dev/ttyACM0

11. When the transfer command finishes, enter the target console again:

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    [host] $ picocom -b 115200 /dev/ttyACM0

12. Type Ctrl-C to interrupt the cat command:

    Code Block
    ^C / #

13. Run uudecode to convert the ASCII file back to the binary file:

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    ~ # uudecode /test.encoded -o /test

14. Change mode to allow running the application binary:

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    ~ # chmod a+x /test

15. Finally, run the application:

    Code Block
    ~ # /test Hello, i.MX RTxxxx ~ #