task-02

previous task

Task 2: Custom shell handlers

Task 2.1: A simple echo command handler

Extend the echo() function in main.c to print the first argument to the command handler

int cmd_handler(int argc, char **argv);

Any parameters following the shell command in the RIOT shell are accessible from the argv variable. argc contains the number of parameters used to call this shell command plus one for the name of the command.

Your function must return 0 if it runs successfully and or anything else if an error occurs.

Shell commands need to be added manually to the shell on initialization

#include "shell.h"

static const shell_command_t shell_commands[] = {
    { "command name", "command description", cmd_handler },
    { NULL, NULL, NULL }
};

/* ... */
    shell_run(commands, line_buf, SHELL_DEFAULT_BUFSIZE)
/* ... */

Please note, that the list of shell commands must be terminated with an empty entry.

Task 2.2: Control the hardware

1. Include the led.h file to get access to the LED0_TOGGLE macro.
2. Write a command handler toggle in main.c that toggles the primary LED on the board using the LED0_TOGGLE macro.

Read the Doc

next task