NRF51 with PTR5518 range problems

[tanja]

Hi friends,

I'm using a NRF51 IC with this 4.0BLE Modul PTR5518 and i have big problems with Range. As a protocoll i use gazell. In air it is possible do get some correct signals up to 6-7 m but that it don't work properly anymore. If you have a human body in between it is a disaster, you only get good signals with a range <1m. Can i somehow approve this? Please help me if you can. I'm very desperate.

Thank you in advance. Tanja

[tanja]

Here the gazell setup code, maybe there is a mistake??

//The Gazell pipe on which the communication between host and device is carried out. Must be between 1 and 6.
#define GAZELL_DATA_PIPE                                                                                                                                    (1)

//THE PAIRING PIPE MUST ALWAYS BE PIPE 0, or else the concept won't work!!!
#define GAZELL_PAIRING_PIPE                                                                                                                               (0)

//Not used on the remote, but kept here for consistency
#define GAZELL_PAIRING_DATA_STORAGE_ADDRESS                                                                  (0x0003FC00)

//Please read the Flash module description and the documentation of flash_segment_t/struct flash_segment before
//changing the values of any defines that begin with 'GAZELL_PAIRING_FLASH_'.

#define GAZELL_PAIRING_FLASH_NUMBER_OF_FIELDS                                               (16)

#define GAZELL_PAIRING_FLASH_0_RELATIVE_ADDRESS_DIRTY_BITS    (4)

#define GAZELL_PAIRING_FLASH_0_RELATIVE_ADDRESS_FIELDS                             (8)

#define GAZELL_PAIRING_FLASH_1_RELATIVE_ADDRESS_DIRTY_BITS    (72)

#define GAZELL_PAIRING_FLASH_1_RELATIVE_ADDRESS_FIELDS                             (76)

#define GAZELL_PAIRING_PROCEDURE_TIMEOUT_MS                                                                 (60)

#define GAZELL_MINIMUM_INTERVAL_BETWEEN_PAIR_AND_UNPAIR_MS        (2000)

#define GAZELL_MAX_NUM_STORED_PACKETS                                                                               (8)

#define GAZELL_DEVICE_DUMMY_PACKET_SEND_INTERVAL_10MS                       (5)

#define GAZELL_CHANNEL_TABLE                                                                                                                        2, 8, 12, 18, 22, 28, 32, 38, 42, 48, 52, 58, 62, 68, 80

#define GAZELL_BAUDRATE_KBITPS                                                                                                                    (250)


void Gazell_Init(void)
{
#if (GAZELL_MODE_DEVICE == GAZELL_MODE)
                flash_segment_t flashSegmentPairingID0 = {
                               .bitsPerField = 32,
                               .numberOfFields = GAZELL_PAIRING_FLASH_NUMBER_OF_FIELDS,
                               .relativeAddressOfFirstDirtyBit = GAZELL_PAIRING_FLASH_0_RELATIVE_ADDRESS_DIRTY_BITS,
                               .relativeAddressOfFirstField = GAZELL_PAIRING_FLASH_0_RELATIVE_ADDRESS_FIELDS
                };
                flash_segment_t flashSegmentPairingID1 = {
                               .bitsPerField = 32,
                               .numberOfFields = GAZELL_PAIRING_FLASH_NUMBER_OF_FIELDS,
                               .relativeAddressOfFirstDirtyBit = GAZELL_PAIRING_FLASH_1_RELATIVE_ADDRESS_DIRTY_BITS,
                               .relativeAddressOfFirstField = GAZELL_PAIRING_FLASH_1_RELATIVE_ADDRESS_FIELDS
                };

                flashSegmentNumberParingID0 = Flash_RegisterSegment(flashSegmentPairingID0);
                flashSegmentNumberParingID1 = Flash_RegisterSegment(flashSegmentPairingID1);

                pairID[0] = Flash_ReadData(flashSegmentNumberParingID0);
                pairID[1] = Flash_ReadData(flashSegmentNumberParingID1);

                nrf_gzll_init(NRF_GZLL_MODE_DEVICE);
                nrf_gzll_set_max_tx_attempts(50);
                if((pairID[0] != 0) && pairID[1] != 0)
                {
                               nrf_gzll_set_base_address_1(GenerateValidBaseAddressFromChipID(pairID));
                               isPaired = TRUE;
                }
#elif (GAZELL_MODE_HOST == GAZELL_MODE)
                pairID[0] = NRF_FICR->DEVICEID[0];
                pairID[1] = NRF_FICR->DEVICEID[1];
                nrf_gzll_init(NRF_GZLL_MODE_HOST);
                nrf_gzll_set_base_address_1(GenerateValidBaseAddressFromChipID(pairID));
#else
#error GAZELL_MODE is undefined or it has some unknown value.
#endif
                nrf_gzll_set_tx_power(NRF_GZLL_TX_POWER_4_DBM);
#if (250 == GAZELL_BAUDRATE_KBITPS)
                nrf_gzll_set_datarate(NRF_GZLL_DATARATE_250KBIT);
                nrf_gzll_set_timeslot_period(2700);
#elif (1000 == GAZELL_BAUDRATE_KBITPS)
                nrf_gzll_set_datarate(NRF_GZLL_DATARATE_1MBIT);
                nrf_gzll_set_timeslot_period(900);
#elif (2000 == GAZELL_BAUDRATE_KBITPS)
#else
#error Wrong baudrate selected. Possible values are 2000, 1000 or 250.
#endif
         nrf_gzll_set_device_channel_selection_policy(NRF_GZLL_DEVICE_CHANNEL_SELECTION_POLICY_USE_CURRENT);
                generateAndSetChannelTable();
                nrf_gzll_set_timeslots_per_channel(5);
                nrf_gzll_set_timeslots_per_channel_when_device_out_of_sync(1);
                nrf_gzll_enable();
}