Hi, I want to send a constant carrier during production testing of a product. First I call sd_softdevice_disable(); then I do the following:
//Restart radio
NRF_PPI->CHENCLR = PPI_CHENCLR_CH0_Msk | PPI_CHENCLR_CH1_Msk;
NRF_RADIO->SHORTS = 0;
NRF_RADIO->EVENTS_DISABLED = 0;
NRF_RADIO->TASKS_DISABLE = 1;
while (NRF_RADIO->EVENTS_DISABLED == 0)
{
// Do nothing
}
NRF_RADIO->EVENTS_DISABLED = 0;
NRF_RADIO->TASKS_RXEN = 0;
NRF_RADIO->TASKS_TXEN = 0;
NRF_RADIO->PREFIX0 &= ~RADIO_PREFIX0_AP0_Msk;
NRF_RADIO->PREFIX0 |= (0x71764129 >> 24) & RADIO_PREFIX0_AP0_Msk;
NRF_RADIO->BASE0 = 0x71764129 << 8;
NRF_RADIO->RXADDRESSES = RADIO_RXADDRESSES_ADDR0_Enabled << RADIO_RXADDRESSES_ADDR0_Pos;
NRF_RADIO->TXADDRESS = (0x00 << RADIO_TXADDRESS_TXADDRESS_Pos) & RADIO_TXADDRESS_TXADDRESS_Msk;
// Configure CRC calculation
NRF_RADIO->CRCCNF = (1 << RADIO_CRCCNF_SKIPADDR_Pos) |
(RADIO_CRCCNF_LEN_Three << RADIO_CRCCNF_LEN_Pos);
NRF_RADIO->PCNF0 = (0 << RADIO_PCNF0_S1LEN_Pos) |
(1 << RADIO_PCNF0_S0LEN_Pos) |
(8 << RADIO_PCNF0_LFLEN_Pos);
NRF_RADIO->PCNF1 = (RADIO_PCNF1_WHITEEN_Disabled << RADIO_PCNF1_WHITEEN_Pos) |
(RADIO_PCNF1_ENDIAN_Little << RADIO_PCNF1_ENDIAN_Pos) |
(3 << RADIO_PCNF1_BALEN_Pos) |
(0 << RADIO_PCNF1_STATLEN_Pos) |
(37 << RADIO_PCNF1_MAXLEN_Pos);
NRF_RADIO->TEST = 0;
NRF_RADIO->CRCPOLY = m_crc_poly;
NRF_RADIO->CRCINIT = m_crc_init;
NRF_RADIO->FREQUENCY = frequency; // Actual frequency (MHz): 2400 + register value
NRF_RADIO->PACKETPTR = (uint32_t)&package[0]; // Setting packet pointer will start the radio
NRF_RADIO->EVENTS_READY = 0;
NRF_RADIO->TXPOWER = RADIO_TXPOWER_TXPOWER_Pos4dBm<<RADIO_TXPOWER_TXPOWER_Pos;
NRF_RADIO->TEST = (RADIO_TEST_PLLLOCK_Enabled << RADIO_TEST_PLLLOCK_Pos) | (RADIO_TEST_CONSTCARRIER_Enabled << RADIO_TEST_CONSTCARRIER_Pos);
NRF_RADIO->MODE=RADIO_MODE_MODE_Ble_1Mbit<<RADIO_MODE_MODE_Pos;
// Shortcut between READY event and START task
NRF_RADIO->SHORTS = 1 << RADIO_SHORTS_READY_START_Pos;
// Shortcut will start radio in Tx mode when it is ready
NRF_RADIO->TASKS_TXEN = 1;
//Just wait here, the test jigg will cut power to the unit
while(1);
I have tried a lot of different settings but every time I just get modulated data. When I compare with a unit loaded with DTM firmware and send a constant carrier I can see that the DTM unit sends a much smaller spectrum but my code sends a gaussian distrubited spectrum which i assume is data beeing modulated.
How do I configure the radio to only send carrier?
