void dccthread_yield(void)
{
if(is_it_manager_running) return;
is_it_manager_running=1;
blockInterrupts();
int old_index = send_to_the_end();
#ifdef DEBUG
printf("Swapping %d -> Manager\n", thread_ready_queue[old_index]->id);
#endif
swapcontext(&(thread_ready_queue[old_index]->context), &manager);
}
/// @details
/// This call provides direct access to the RFM12B registers. If you're careful
/// to avoid configuring the wireless module in a way which stops the driver
/// from functioning, this can be used to adjust some settings.
/// See the RFM12B wireless module documentation.
static uint16_t rf12_xfer (uint16_t cmd) {
blockInterrupts();
// writing can take place at full speed, even 8 MHz works
bitClear(SS_PORT, cs_pin);
uint16_t res = rf12_byte(cmd >> 8) << 8;
res |= rf12_byte(cmd);
bitSet(SS_PORT, cs_pin);
allowInterrupts();
return res;
}
/// @details
/// Requests RFM12 state from RF module and reads back a waiting data byte if there is
/// any.
/// One of two commands accessing SPI, so interrupts disabled in here
/// @param *data Pointer to byte where to write the received data to (if any)
static uint16_t rf12_xferState (uint8_t *data) {
blockInterrupts();
// writing can take place at full speed, even 8 MHz works
bitClear(SS_PORT, cs_pin);
uint16_t res = rf12_byte(0x00) << 8;
res |= rf12_byte(0x00);
if (res & RF_FIFO_BIT && rxstate == TXRECV) {
// slow down to under 2.5 MHz
#if F_CPU > 10000000
bitSet(SPCR, SPR0);
#endif
*data = rf12_byte(0x00);
#if F_CPU > 10000000
bitClear(SPCR, SPR0);
#endif
}
bitSet(SS_PORT, cs_pin);
allowInterrupts();
return res;
}
