Add files for handling commands.

src/commands.c

@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <avr/io.h>
+
+#include "include/commands.h"
+
+cmd_t command = {
+	.buf = {0},
+	.index = 0
+};
+
+void cmd_collect(char c)
+{
+	command.buf[command.index] = c;
+	printf("%c", command.buf[command.index]);	
+	command.index++;
+
+
+	if (c == 0x3) {
+		/* React on Ctl-C */
+		command.index = 0;
+		printf("\r\n");
+	}
+		
+
+	if (c == 0xD) {
+		printf("\n\r");
+
+		/* Null-terminate the string */
+		command.buf[command.index-1] = '\0';
+		cmd_handle(&command);
+		command.index = 0;
+	}
+}
+
+void cmd_handle(cmd_t *command)
+{
+	printf("\n\r");
+
+	char *tok1 = strtok(command->buf, " ");
+	char *tok2 = strtok(NULL, " ");
+	char *tok3 = strtok(NULL, " ");
+
+	if (0 == strcmp(tok1, "set"))
+		cmd_handle_set(tok2, tok3);
+}
+
+void cmd_handle_set(char *op1, char *op2) 
+{
+	int val;
+
+	if (0 == strcmp(op1, "t0_top")) {
+		val = atoi(op2);
+		if (val) {
+			OCR0A = val;
+			printf("Setting Timer0 TOP to %i\r\n", val);
+		}
+		 else
+		 	printf("No valid value for t0_top given\n\r");
+	}
+}

src/include/commands.h

@@ -0,0 +1,8 @@
+typedef struct {
+    char buf[100];
+    int index;
+} cmd_t;
+
+void cmd_collect(char c);
+void cmd_handle(cmd_t *command);
+void cmd_handle_set(char *op1, char *op2);