mirror of
git://projects.qi-hardware.com/antorcha.git
synced 2024-12-23 18:42:25 +02:00
115 lines
2.2 KiB
C
115 lines
2.2 KiB
C
/*
|
|
* fw/dispatch.c - Wireless protocol dispatcher
|
|
*
|
|
* Written 2012 by Werner Almesberger
|
|
* Copyright 2012 Werner Almesberger
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
|
|
#include <stddef.h>
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
#include "version.h"
|
|
#include "rf.h"
|
|
#include "proto.h"
|
|
#include "dispatch.h"
|
|
|
|
|
|
static uint8_t seq; /* last sequence number seen */
|
|
static uint8_t type; /* type currently being processed */
|
|
static uint8_t limit; /* last limit seen */
|
|
static const struct handler *curr_proto = NULL;
|
|
|
|
|
|
static void send_ack(const uint8_t *buf)
|
|
{
|
|
uint8_t ack[3] = { buf[0]+1, buf[1], 0 };
|
|
|
|
rf_send(ack, sizeof(ack));
|
|
}
|
|
|
|
|
|
static bool answer_ping(const uint8_t *buf)
|
|
{
|
|
char num[6]; /* let's hope we won't need more than 9999 versions */
|
|
char *num_end = num+sizeof(num);
|
|
int date_len = strlen(build_date);
|
|
int num_len;
|
|
uint8_t pong[3] = { PONG, 0, 0 };
|
|
uint8_t tmp[3+6+date_len+1];
|
|
char *s;
|
|
int n;
|
|
|
|
if (buf[1])
|
|
return 0;
|
|
s = num_end-1;
|
|
*s = ' ';
|
|
for (n = build_number; n; n /= 10)
|
|
*--s = '0'+n % 10;
|
|
*--s = '#';
|
|
num_len = num_end-s;
|
|
memcpy(tmp, pong, 3);
|
|
memcpy(tmp+3, s, num_len);
|
|
memcpy(tmp+3+num_len, build_date, date_len);
|
|
rf_send(tmp, 3+num_len+date_len);
|
|
return 1;
|
|
}
|
|
|
|
|
|
bool dispatch(const uint8_t *buf, uint8_t len, const struct handler **protos)
|
|
{
|
|
if (len == 3 && buf[0] == PING)
|
|
return answer_ping(buf);
|
|
|
|
if (len != 64+3)
|
|
return 0;
|
|
|
|
if (!buf[1]) {
|
|
while (*protos) {
|
|
if ((*protos)->type == buf[0])
|
|
break;
|
|
protos++;
|
|
}
|
|
if (!*protos)
|
|
return 0;
|
|
if (!(*protos)->first(buf+3))
|
|
return 0;
|
|
curr_proto = *protos;
|
|
type = buf[0];
|
|
seq = 1;
|
|
limit = buf[2];
|
|
send_ack(buf);
|
|
return 1;
|
|
}
|
|
|
|
if (!curr_proto)
|
|
return 0;
|
|
if (buf[0] != type)
|
|
return 0;
|
|
if (buf[2] != limit)
|
|
return 0;
|
|
if (buf[1] > limit)
|
|
return 0;
|
|
|
|
if (buf[1]+1 == seq) {
|
|
send_ack(buf);
|
|
return 0;
|
|
}
|
|
if (buf[1] != seq)
|
|
return 0;
|
|
|
|
if (!curr_proto->more(seq, limit, buf+3))
|
|
return 0;
|
|
seq++;
|
|
send_ack(buf);
|
|
return 1;
|
|
|
|
}
|