Sample code for menu Navigation of mobile

[LIST]
[*]At initialization, set state to OFF

[*]Menu Handler code
if KEY=RUN And MOTOR=OFF
[INDENT]Turn motor On
Set state to RUNNING
[/INDENT]
else if KEY=STOP And MOTOR=RUNNING
[INDENT]Turn motor Off
Set state to OFF
[/INDENT]
[/LIST]

typedef enum _APP_STATES {APP_IDLE,  APP_SEND, APP_RECEIVE} APP_STATES;
typedef enum _SEND_STATES {SEND_PROCESS_KEY, SEND_HEADER, SEND_MESSAGE, SEND_TERMINATOR} SEND_STATES;
typedef enum _RECEIVE_STATES {RECEIVE_PROCESS_KEY, RECEIVE_HEADER, RECEIVE_MESSAGE} RECEIVE_STATES;

void main(void)
{
	char key;
	APP_STATES app_state = APP_IDLE;
	SEND_STATES send_state = SEND_PROCESS_KEY;
	RECEIVE_STATES = receive_state = RECEIVE_PROCESS_KEY;

	while(1)
	{
		switch(app_state)
		{
			case APP_IDLE:
				key = GetKey();
				switch(key)
				{
					case 'S':
						app_state = APP_SEND;
						break;
							
					case 'R'
						app_state = APP_RECEIVE;
						break;
				}
				break;
				
			case APP_SEND:
				ProcessSendState();
				break;			

			case APP_RECEIVE:
				ProcessReceiveState();
				break;			
		}				
	}
}


void ProcessSendState(void)
{
	switch(send_state)
	{
		case SEND_PROCESS_KEY:
			key = GetKey();
			switch(key)
			{
				case 'H':	// Send Header
					send_state = SEND_HEADER;
					break;
						
				case 'M'	// Send Nessage
					send_state = SEND_MESSAGE;
					break;

				case 'T'	// Send Terminator
					send_state = SEND_TERMINATOR;
					break;
					
				case 'Q'	// Done sending
					app_state = APP_IDLE;  // Set App stat eto Idle
					break;

			}	
			break;
			
		case SEND_HEADER:
			SendHeader();
			send_state = SEND_PROCESS_KEY;
			break;
			
		case SEND_MESSAGE:
			SendMessage();
			send_state = SEND_PROCESS_KEY;
			break;
			
		case SEND_TERMINATOR	
			SendTerminator();
			send_state = SEND_PROCESS_KEY;
			break;
	}
}