wordclock/animations/borg_time.c

/*
 * Description:	Request time strings from a can-master
 * 				and show them in an animation
 * Author: 		hansi
 */

#include <stdio.h>
#include <stdlib.h>
#include <avr/pgmspace.h>
#include "../config.h"
#include "../can/can.h"
#include "../can/lap.h"
#include "../util.h"
#include "../scrolltext/scrolltext.h"

#ifndef TIME_MASTER_ADDR
	#define TIME_MASTER_ADDR 0x00
#endif
#ifndef TIME_UPDATE_TIMEOUT
	#define TIME_UPDATE_TIMEOUT 23
#endif

//hackhack
extern can_addr myaddr;

//send a time request packet via can
void time_request(void)
{
	pdo_message msg;

	//source address
	msg.addr_src = myaddr;
	msg.port_src = PORT_MGT;

	//destination address
	msg.addr_dst = TIME_MASTER_ADDR;
	msg.port_dst = PORT_MGT;

	//time request command
	msg.cmd = FKT_MGT_TIMEREQUEST;

	//set length and transmit
	msg.dlc = 1;
	can_transmit((can_message *)&msg);
}

//update time via can, possibly blocking
uint8_t time_update(void)
{
	uint8_t timeout = TIME_UPDATE_TIMEOUT;

	//set "time-has-been-updated" to false
	lap_time_update = 0;

	//send request
	time_request();

	//wait some time for a reply in 1ms steps
	while((lap_time_update == 0) && (timeout-- > 0))
		wait(1);

	return lap_time_update;
}

//display the time
void time_anim(void)
{
	char timestring[48];

	//update time and return if we had no success
	if(time_update() == 0)
	{
		strcpy_P(timestring, PSTR("</#time animation timeout"));
		scrolltext(timestring);
		return;
	}

	//convert the time to a string
	sprintf_P(timestring, PSTR(">+:p42d50/#%02hi#<;+p42d50/# %02hi#x49y8b255p42d50#:"), lap_time_h, lap_time_m);

	//show the time
	scrolltext(timestring);
}