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;
}
}
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;
}
}
}
U8 chb_get_rand()
{
if (radio_id == CHB_AT86RF230)
{
// part ID AT86RF230 does not support true random number generation
char buf[50];
// nothing to be done here. print warning & return.
strcpy_P(buf, chb_err_not_supported);
Serial.print(buf);
return 0;
}
else if ((radio_id == CHB_AT86RF212) || (radio_id == CHB_AT86RF231))
{
U8 i, rnd, tmp;
rnd = tmp = 0;
for (i=0; i<4; i++)
{
tmp = chb_reg_read(PHY_RSSI);
tmp >>= 5;
tmp &= 0x03;
rnd |= tmp << (i*2);
chb_delay_us(5);
}
return rnd;
}
void chb_sleep(U8 enb)
{
if (enb)
{
// first we need to go to TRX OFF state
chb_set_state(TRX_OFF);
// then we need to make SLP_TR pin an input. this enables the external
// pullup on that pin. we do this so that we won't need to go through
// a voltage divider which drains current. we want to avoid that when
// we sleep
CHB_SLPTR_DDIR &= ~(_BV(CHB_SLPTR_PIN));
}
else
{
// make sure the SLPTR pin is low first
CHB_SLPTR_PORT &= ~(_BV(CHB_SLPTR_PIN));
// make the SLPTR pin an output
CHB_SLPTR_DDIR |= _BV(CHB_SLPTR_PIN);
// 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_channel(U8 channel)
{
U8 state;
chb_reg_read_mod_write(PHY_CC_CCA, channel, 0x1f);
// add a delay to allow the PLL to lock if in active mode.
state = chb_get_state();
if ((state == RX_ON) || (state == PLL_ON))
{
chb_delay_us(TIME_PLL_LOCK);
}
return ((chb_reg_read(PHY_CC_CCA) & 0x1f) == channel) ? RADIO_SUCCESS : RADIO_TIMED_OUT;
}
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;
}
U8 chb_set_channel(U8 channel)
{
U8 state;
#if (CHB_CHINA == 1)
// this if for China only which uses a 780 MHz frequency band
if ((chb_reg_read(TRX_CTRL2) & 0x3f) != 0x1c)
{
chb_reg_read_mod_write(TRX_CTRL2, 0x1c, 0x3f);
}
if (channel > 3)
{
channel = 0;
}
channel = (channel << 1) + 11;
chb_reg_read_mod_write(CC_CTRL_1, 0x4, 0x7); // set 769 MHz base frequency for China
chb_reg_write(CC_CTRL_0, channel); // set the center frequency for the channel
#else
//if (channel == 0)
//{
// // Channel 0 is for European use only. make sure we are using channel page 2,
// // channel 0 settings for 100 kbps
// if ((chb_reg_read(TRX_CTRL_2) & 0x3f) != 0x08)
// {
// chb_reg_read_mod_write(TRX_CTRL_2, 0x08, 0x3f);
// }
//}
//else if (channel > 10)
//{
// // if the channel is out of bounds for page 2, then default to channel 1 and
// // assume we're on the US frequency of 915 MHz
// channel = 1;
// if ((chb_reg_read(TRX_CTRL_2) & 0x3f) != 0x0c)
// {
// chb_reg_read_mod_write(TRX_CTRL_2, 0x0c, 0x3f);
// }
//}
//else
//{
// // Channels 1-10 are for US frequencies of 915 MHz
// if ((chb_reg_read(TRX_CTRL_2) & 0x3f) != 0x0c)
// {
// chb_reg_read_mod_write(TRX_CTRL_2, 0x0c, 0x3f);
// }
//}
chb_reg_read_mod_write(PHY_CC_CCA, channel, 0x1f);
#endif
// add a delay to allow the PLL to lock if in active mode.
state = chb_get_state();
if ((state == RX_ON) || (state == PLL_ON))
{
chb_delay_us(TIME_PLL_LOCK_TIME);
}
return ((chb_reg_read(PHY_CC_CCA) & 0x1f) == channel) ? RADIO_SUCCESS : RADIO_TIMED_OUT;
}
static void chb_radio_init()
{
U8 ieee_addr[8];
U8 part_num;
// disable intps while we config the radio
chb_reg_write(IRQ_MASK, 0);
// force transceiver off while we configure the intps
chb_reg_read_mod_write(TRX_STATE, CMD_FORCE_TRX_OFF, 0x1F);
chb_delay_us(TIME_P_ON_TO_TRX_OFF);
// set radio cfg parameters
// **note** uncomment if these will be set to something other than default
//chb_reg_read_mod_write(XAH_CTRL_0, CHB_MAX_FRAME_RETRIES << CHB_MAX_FRAME_RETRIES_POS, 0xF << CHB_MAX_FRAME_RETRIES_POS);
//chb_reg_read_mod_write(XAH_CTRL_0, CHB_MAX_CSMA_RETRIES << CHB_MAX_CSMA_RETIRES_POS, 0x7 << CHB_MAX_CSMA_RETIRES_POS);
//chb_reg_read_mod_write(CSMA_SEED_1, CHB_MIN_BE << CHB_MIN_BE_POS, 0x3 << CHB_MIN_BE_POS);
//chb_reg_read_mod_write(CSMA_SEED_1, CHB_CSMA_SEED1 << CHB_CSMA_SEED1_POS, 0x7 << CHB_CSMA_SEED1_POS);
//chb_ret_write(CSMA_SEED0, CHB_CSMA_SEED0);
//chb_reg_read_mod_write(PHY_CC_CCA, CHB_CCA_MODE << CHB_CCA_MODE_POS,0x3 << CHB_CCA_MODE_POS);
//chb_reg_write(CCA_THRES, CHB_CCA_ED_THRES);
//chb_reg_read_mod_write(PHY_TX_PWR, CHB_TX_PWR, 0xf);
// identify device
part_num = chb_reg_read(PART_NUM);
switch (part_num)
{
case CHB_AT86RF230:
// set default channel
chb_set_channel(CHB_2_4GHZ_DEFAULT_CHANNEL);
#if (CHIBI_PROMISCUOUS == 0)
// set autocrc mode
chb_reg_read_mod_write(PHY_TX_PWR, 1 << CHB_AUTO_CRC_POS, 1 << CHB_AUTO_CRC_POS);
#endif
break;
case CHB_AT86RF231:
// set default channel
chb_set_channel(CHB_2_4GHZ_DEFAULT_CHANNEL);
#if (CHIBI_PROMISCUOUS == 0)
// set autocrc mode
chb_reg_read_mod_write(PHY_TX_PWR, 1 << CHB_AUTO_CRC_POS, 1 << CHB_AUTO_CRC_POS);
#endif
break;
case CHB_AT86RF212:
// set mode to OQPSK or BPSK depending on setting
chb_set_mode(CHB_INIT_MODE);
// set default channel and tx power to max
chb_set_channel(CHB_900MHZ_DEFAULT_CHANNEL);
chb_reg_read_mod_write(PHY_TX_PWR, CHB_900MHZ_TX_PWR, 0xf);
#if (CHIBI_PROMISCUOUS == 0)
// set autocrc mode
chb_reg_read_mod_write(TRX_CTRL1, 1 << CHB_AUTO_CRC_POS, 1 << CHB_AUTO_CRC_POS);
#endif
break;
default:
Serial.print("ERROR: Unknown radio detected.\n");
break;
}
// set transceiver's fsm state
chb_set_state(RX_STATE);
// set pan ID
chb_reg_write16(PAN_ID_0, CHB_PAN_ID);
// set short addr
// NOTE: Possibly get this from EEPROM
chb_reg_write16(SHORT_ADDR_0, chb_get_short_addr());
// set long addr
// NOTE: Possibly get this from EEPROM
chb_get_ieee_addr(ieee_addr);
chb_reg_write64(IEEE_ADDR_0, ieee_addr);
// do a read of the interrupt register to clear the interrupt bits
chb_reg_read(IRQ_STATUS);
// re-enable intps while we config the radio
chb_reg_write(IRQ_MASK, 0x8);
// enable mcu intp pin on INT6 for rising edge
CFG_CHB_INTP();
if (chb_get_state() != RX_STATE)
{
// ERROR occurred initializing the radio. Print out error message.
char buf[50];
// grab the error message from flash & print it out
strcpy_P(buf, chb_err_init);
Serial.print(buf);
}
}