void send_ack(uint8_t seq_num) {
border_packet_t *packet = (border_packet_t *)get_serial_out_buffer(0);
packet->empty = 0;
packet->type = BORDER_PACKET_ACK_TYPE;
packet->seq_num = seq_num;
writepacket((uint8_t *)packet, sizeof (border_packet_t));
}
void flowcontrol_send_over_uart(border_packet_t *packet, int len) {
struct send_slot *slot;
uint8_t args[] = {packet->seq_num};
sem_wait(&(slwin_stat.send_win_not_full));
packet->seq_num = ++slwin_stat.last_frame;
slot = &(slwin_stat.send_win[packet->seq_num % BORDER_SWS]);
memcpy(slot->frame, (uint8_t *)packet, len);
slot->frame_len = len;
if (set_timeout(&slot->timeout, BORDER_SL_TIMEOUT, (void *)args) != 0) {
printf("ERROR: Error invoking timeout timer\n");
return;
}
writepacket((uint8_t *)packet, len);
}
static void sending_slot(void)
{
while (1) {
msg_t m;
msg_receive(&m);
uint8_t seq_num = *((uint8_t *) m.content.ptr);
struct send_slot *slot = &(slwin_stat.send_win[seq_num % BORDER_SWS]);
border_packet_t *tmp = (border_packet_t *)slot->frame;
if (seq_num == tmp->seq_num) {
writepacket(slot->frame, slot->frame_len);
if (set_timeout(&slot->timeout, timex_set(0, BORDER_SL_TIMEOUT), (void *)m.content.ptr) != 0) {
printf("ERROR: Error invoking timeout timer\n");
}
}
}
}