void chb_reset()
{
CHB_RST_DISABLE();
CHB_SLPTR_DISABLE();
// wait a bit while transceiver wakes up
chb_delay_us(TIME_P_ON_TO_CLKM_AVAIL);
// reset the device
CHB_RST_ENABLE();
chb_delay_us(TIME_RST_PULSE_WIDTH);
CHB_RST_DISABLE();
// check that we have the part number that we're expecting
while (1)
{
// if you're stuck in this loop, that means that you're not reading
// the version and part number register correctly. possible that version number
// changes. if so, update version num in header file
if ((chb_reg_read(VERSION_NUM) == CHB_AT86RF212_VER_NUM) && (chb_reg_read(PART_NUM) == CHB_AT86RF212_PART_NUM))
{
break;
}
}
}
error_t chb_reset()
{
CHB_RST_DISABLE();
CHB_SLPTR_DISABLE();
// wait a bit while transceiver wakes up
chb_delay_us(TIME_P_ON_TO_CLKM_AVAIL);
// reset the device
CHB_RST_ENABLE();
chb_delay_us(TIME_RST_PULSE_WIDTH);
CHB_RST_DISABLE();
// check that we have the part number that we're expecting
// if you're stuck here, that means that you're not reading
// the version and part number register correctly. possible that version number
// changes. if so, update version num in header file
if ((chb_reg_read(VERSION_NUM) == CHB_AT86RF212_VER_NUM) && (chb_reg_read(PART_NUM) == CHB_AT86RF212_PART_NUM))
{
return ERROR_NONE;
}
else
{
return ERROR_DEVICENOTINITIALISED;
}
}
U8 chb_tx(U8 *hdr, U8 *data, U8 len)
{
U8 state = chb_get_state();
pcb_t *pcb = chb_get_pcb();
if ((state == BUSY_TX) || (state == BUSY_TX_ARET))
{
return RADIO_WRONG_STATE;
}
// TODO: check why we need to transition to the off state before we go to tx_aret_on
chb_set_state(TRX_OFF);
chb_set_state(TX_ARET_ON);
// TODO: try and start the frame transmission by writing TX_START command instead of toggling
// sleep pin...i just feel like it's kind of weird...
// write frame to buffer. first write header into buffer (add 1 for len byte), then data.
chb_frame_write(hdr, CHB_HDR_SZ + 1, data, len);
// TEST - check data in buffer
//{
// U8 i, len, tmp[30];
//
// len = 1 + CHB_HDR_SZ + len;
// chb_sram_read(0, len, tmp);
// for (i=0; i<len; i++)
// {
// printf("%02X ", tmp[i]);
// }
// printf("\n");
// state = chb_get_state();
// printf("State = %02X.\n", state);
//}
//TEST
//Do frame transmission. Toggle the SLP_TR pin to initiate the frame transmission.
CHB_SLPTR_ENABLE();
CHB_SLPTR_DISABLE();
// wait for the transmission to end, signalled by the TRX END flag
while (!pcb->tx_end);
pcb->tx_end = false;
// check the status of the transmission
return chb_get_status();
}
void chb_sleep(U8 enb)
{
if (enb)
{
// first we need to go to TRX OFF state
chb_set_state(TRX_OFF);
// set the SLPTR pin
CHB_SLPTR_ENABLE();
}
else
{
// make sure the SLPTR pin is low first
CHB_SLPTR_DISABLE();
// we need to allow some time for the PLL to lock
chb_delay_us(TIME_SLEEP_TO_TRX_OFF);
// Turn the transceiver back on
chb_set_state(RX_STATE);
}
}
U8 chb_set_state(U8 state)
{
U8 curr_state, delay;
// if we're sleeping then don't allow transition
if (gpioGetValue(CHB_SLPTRPORT, CHB_SLPTRPIN))
{
return RADIO_WRONG_STATE;
}
// if we're in a transition state, wait for the state to become stable
curr_state = chb_get_state();
if ((curr_state == BUSY_TX_ARET) || (curr_state == BUSY_RX_AACK) || (curr_state == BUSY_RX) || (curr_state == BUSY_TX))
{
while (chb_get_state() == curr_state);
}
// At this point it is clear that the requested new_state is:
// TRX_OFF, RX_ON, PLL_ON, RX_AACK_ON or TX_ARET_ON.
// we need to handle some special cases before we transition to the new state
switch (state)
{
case TRX_OFF:
/* Go to TRX_OFF from any state. */
CHB_SLPTR_DISABLE();
chb_reg_read_mod_write(TRX_STATE, CMD_FORCE_TRX_OFF, 0x1f);
chb_delay_us(TIME_ALL_STATES_TRX_OFF);
break;
case TX_ARET_ON:
if (curr_state == RX_AACK_ON)
{
/* First do intermediate state transition to PLL_ON, then to TX_ARET_ON. */
chb_reg_read_mod_write(TRX_STATE, CMD_PLL_ON, 0x1f);
chb_delay_us(TIME_RX_ON_PLL_ON);
}
break;
case RX_AACK_ON:
if (curr_state == TX_ARET_ON)
{
/* First do intermediate state transition to RX_ON, then to RX_AACK_ON. */
chb_reg_read_mod_write(TRX_STATE, CMD_PLL_ON, 0x1f);
chb_delay_us(TIME_RX_ON_PLL_ON);
}
break;
}
/* Now we're okay to transition to any new state. */
chb_reg_read_mod_write(TRX_STATE, state, 0x1f);
/* When the PLL is active most states can be reached in 1us. However, from */
/* TRX_OFF the PLL needs time to activate. */
delay = (curr_state == TRX_OFF) ? TIME_TRX_OFF_PLL_ON : TIME_RX_ON_PLL_ON;
chb_delay_us(delay);
if (chb_get_state() == state)
{
return RADIO_SUCCESS;
}
return RADIO_TIMED_OUT;
}