register setting problem on NRF52833!

[Armin_B]

based on nRF SDK 16 radio (peripheral)  example, in radio_config file, i set registers of TXPOWER, FREQUENCY, MODE, PCNF0, PCNF1 (and ADDR and CRC related registers) and also some DFE related registers including: DFEMODE,  CTEINLINECONF, DFECTRL1, DFEPACKET.

in the application i print the actual register values before executing radio_config() function and also after that; to check what are actual register values before and after configuration. the result i get shows that only MODE, PCNF0 and PCNF1  (and also ADDR and CRC related register) are correctly set, and other registers like TXPOWER, FREQUENCY and all of DFE related registers (DFEMODE,  CTEINLINECONF, DFECTRL1, DFEPACKET)  are left unchanged!

note that i have configured the AOA mode for RX.

where i  went wrong?

[awneil]

Are you using a SoftDevice?

Note that the SoftDevice locks access to certain registers, so you cannot access them directly - you have to go via the appropriate API ...

[Armin_B]

this is the function that set RADIO registers:

void radio_configure()
{
// Radio config
NRF_RADIO->TXPOWER = (RADIO_TXPOWER_TXPOWER_Pos4dBm << RADIO_TXPOWER_TXPOWER_Pos);
NRF_RADIO->FREQUENCY = 7UL; // Frequency bin 2, 2402MHz
NRF_RADIO->MODE = (RADIO_MODE_MODE_Ble_1Mbit << RADIO_MODE_MODE_Pos);

// Radio address config
NRF_RADIO->PREFIX0 =
((uint32_t)swap_bits(0xC3) << 24) // Prefix byte of address 3 converted to nRF24L series format
| ((uint32_t)swap_bits(0xC2) << 16) // Prefix byte of address 2 converted to nRF24L series format
| ((uint32_t)swap_bits(0xC1) << 8) // Prefix byte of address 1 converted to nRF24L series format
| ((uint32_t)swap_bits(0xC0) << 0); // Prefix byte of address 0 converted to nRF24L series format

NRF_RADIO->PREFIX1 =
((uint32_t)swap_bits(0xC7) << 24) // Prefix byte of address 7 converted to nRF24L series format
| ((uint32_t)swap_bits(0xC6) << 16) // Prefix byte of address 6 converted to nRF24L series format
| ((uint32_t)swap_bits(0xC4) << 0); // Prefix byte of address 4 converted to nRF24L series format

NRF_RADIO->BASE0 = bytewise_bitswap(0x01234567UL); // Base address for prefix 0 converted to nRF24L series format
NRF_RADIO->BASE1 = bytewise_bitswap(0x89ABCDEFUL); // Base address for prefix 1-7 converted to nRF24L series format

NRF_RADIO->TXADDRESS = 0x00UL; // Set device address 0 to use when transmitting
NRF_RADIO->RXADDRESSES = 0x01UL; // Enable device address 0 to use to select which addresses to receive

// Packet configuration
NRF_RADIO->PCNF0 = (PACKET_S1_FIELD_SIZE << RADIO_PCNF0_S1LEN_Pos) |
(PACKET_S0_FIELD_SIZE << RADIO_PCNF0_S0LEN_Pos) |
(PACKET_LENGTH_FIELD_SIZE << RADIO_PCNF0_LFLEN_Pos); //lint !e845 "The right argument to operator '|' is certain to be 0"

// Packet configuration
NRF_RADIO->PCNF1 = (RADIO_PCNF1_WHITEEN_Disabled << RADIO_PCNF1_WHITEEN_Pos) |
(RADIO_PCNF1_ENDIAN_Big << RADIO_PCNF1_ENDIAN_Pos) |
(PACKET_BASE_ADDRESS_LENGTH << RADIO_PCNF1_BALEN_Pos) |
(PACKET_STATIC_LENGTH << RADIO_PCNF1_STATLEN_Pos) |
(PACKET_PAYLOAD_MAXSIZE << RADIO_PCNF1_MAXLEN_Pos); //lint !e845 "The right argument to operator '|' is certain to be 0"

// CRC Config
NRF_RADIO->CRCCNF = (RADIO_CRCCNF_LEN_Two << RADIO_CRCCNF_LEN_Pos); // Number of checksum bits
if ((NRF_RADIO->CRCCNF & RADIO_CRCCNF_LEN_Msk) == (RADIO_CRCCNF_LEN_Two << RADIO_CRCCNF_LEN_Pos))
{
NRF_RADIO->CRCINIT = 0xFFFFUL; // Initial value
NRF_RADIO->CRCPOLY = 0x11021UL; // CRC poly: x^16 + x^12^x^5 + 1
}
else if ((NRF_RADIO->CRCCNF & RADIO_CRCCNF_LEN_Msk) == (RADIO_CRCCNF_LEN_One << RADIO_CRCCNF_LEN_Pos))
{
NRF_RADIO->CRCINIT = 0xFFUL; // Initial value
NRF_RADIO->CRCPOLY = 0x107UL; // CRC poly: x^8 + x^2^x^1 + 1
}

// ------------- DFE Config (Direction Finding Mode) --------------- //
//@ tarnsmitter
NRF_RADIO->DFEMODE = (RADIO_DFEMODE_DFEOPMODE_AoA << RADIO_DFEMODE_DFEOPMODE_Pos); // set DFEMODE as AOA

/**
* @brief configuring the radio in DFE mode with this settings:
* CTEINLINECTRLEN = 1 >>>> inline configuration enabled
* CTEINFOINS1 = NotInS1 >>>> CTEinfo settings for ADV PDU case
*/

NRF_RADIO->CTEINLINECONF = (RADIO_CTEINLINECONF_CTEINLINECTRLEN_Enabled << RADIO_CTEINLINECONF_CTEINLINECTRLEN_Pos)|
(RADIO_CTEINLINECONF_CTEINFOINS1_NotInS1 << RADIO_CTEINLINECONF_CTEINFOINS1_Pos)|
(RADIO_CTEINLINECONF_CTEINLINERXMODE2US_125ns << RADIO_CTEINLINECONF_CTEINLINERXMODE2US_Pos); // set sample spacing equal to 125ns

NRF_RADIO->DFECTRL1 = ((uint32_t)CTE_LENGTH_IN_8US << RADIO_DFECTRL1_NUMBEROF8US_Pos)| // set CTE time length for TX
(RADIO_DFECTRL1_TSWITCHSPACING_4us << RADIO_DFECTRL1_TSWITCHSPACING_Pos)|
(RADIO_DFECTRL1_TSAMPLESPACINGREF_125ns << RADIO_DFECTRL1_TSAMPLESPACINGREF_Pos); //set switch time between atennas equal to 4us

NRF_RADIO->DFEPACKET.MAXCNT = (IQ_SAMP_BUFFER_SIZE << RADIO_DFEPACKET_MAXCNT_MAXCNT_Pos);

}

[awneil]