RE: Odd behavior in tx radio and rx radio pairs

ovrebekk — Thu, 29 Jun 2017 07:06:14 GMT

Right.. And some bits are masked out because of the PCNF0 settings. I am glad to hear you found the issue :)

RE: Odd behavior in tx radio and rx radio pairs

radioschmadio — Wed, 28 Jun 2017 18:52:27 GMT

Nevermind, I am an idiot, thats S0, length, and S1. DUH.

RE: Odd behavior in tx radio and rx radio pairs

radioschmadio — Wed, 28 Jun 2017 14:53:31 GMT

So if I send 0x8164D6 the receiver gets 0x812402, no errors flagged.

0xFFFFD6 receives as 0xFF3F02

0xFFFFFFFF receives as 0xFF3F03FF

0x12347856 receives as 0x12340056

0x4225BB receives as 0x422503

0x4217FFFF receives as 0x421703FF

RE: Odd behavior in tx radio and rx radio pairs

radioschmadio — Wed, 28 Jun 2017 14:29:31 GMT

Does the prefix / base have something to do with it?

RE: Odd behavior in tx radio and rx radio pairs

radioschmadio — Wed, 28 Jun 2017 14:15:03 GMT

void hal_radio_config(void) {

NVIC_DisableIRQ(RADIO_IRQn);

// cycle radio power
NRF_RADIO->POWER = RADIO_POWER_POWER_Disabled << RADIO_POWER_POWER_Pos;
NRF_RADIO->POWER = RADIO_POWER_POWER_Enabled << RADIO_POWER_POWER_Pos;

NRF_RADIO->TXPOWER=0x00; //set lowest tx power
NRF_RADIO->SHORTS = 0x000000000;

//length on air of S0, S1, and LFLEN
NRF_RADIO->PCNF0 =   (((1UL) << RADIO_PCNF0_S0LEN_Pos) & RADIO_PCNF0_S0LEN_Msk)
                   | (((2UL) << RADIO_PCNF0_S1LEN_Pos) & RADIO_PCNF0_S1LEN_Msk)
                   | (((6UL) << RADIO_PCNF0_LFLEN_Pos) & RADIO_PCNF0_LFLEN_Msk);

//little endian, base address length (3 + 1 = 4), static length = 0, max length, enable payload	
NRF_RADIO->PCNF1 =   (((RADIO_PCNF1_ENDIAN_Little)        << RADIO_PCNF1_ENDIAN_Pos) & RADIO_PCNF1_ENDIAN_Msk)
                   | (((3UL)                              << RADIO_PCNF1_BALEN_Pos)  & RADIO_PCNF1_BALEN_Msk)
                   | (((0UL)                              << RADIO_PCNF1_STATLEN_Pos)& RADIO_PCNF1_STATLEN_Msk)
                   | ((((uint32_t)DD_MAX_PAYLOAD_LENGTH)  << RADIO_PCNF1_MAXLEN_Pos) & RADIO_PCNF1_MAXLEN_Msk)
                   | ((RADIO_PCNF1_WHITEEN_Enabled << RADIO_PCNF1_WHITEEN_Pos) & RADIO_PCNF1_WHITEEN_Msk);

/* The CRC polynomial is fixed, and is set here. */
/* The CRC initial value may change, and is set by */
/* higher level modules as needed. */
NRF_RADIO->CRCPOLY = (uint32_t)CRC_POLYNOMIAL_INIT_SETTINGS;
NRF_RADIO->CRCCNF = (((RADIO_CRCCNF_SKIPADDR_Skip) << RADIO_CRCCNF_SKIPADDR_Pos) & RADIO_CRCCNF_SKIPADDR_Msk)
                  | (((RADIO_CRCCNF_LEN_Three)      << RADIO_CRCCNF_LEN_Pos)       & RADIO_CRCCNF_LEN_Msk);

	//enable reception on logical address, what does this mean?
NRF_RADIO->RXADDRESSES  = ( (RADIO_RXADDRESSES_ADDR0_Enabled) << RADIO_RXADDRESSES_ADDR0_Pos);

	//set BLE mode
NRF_RADIO->MODE    = ((RADIO_MODE_MODE_Ble_1Mbit) << RADIO_MODE_MODE_Pos) & RADIO_MODE_MODE_Msk;

	//interframe space in us between end tx and begin tx
NRF_RADIO->TIFS = 150;

	//something with access address?
NRF_RADIO->PREFIX0 = access_address[3];
NRF_RADIO->BASE0   = ( (((uint32_t)access_address[2]) << 24) 
                     | (((uint32_t)access_address[1]) << 16)
                     | (((uint32_t)access_address[0]) << 8) );
											 
/* set dev match address */									 
NRF_RADIO->DAB[0] = 0x4ae67dbe;  // 32 least significant
NRF_RADIO->DAP[0] = 0x1172; //16 most significant
NRF_RADIO->DACNF = (0x1) | (0x100); //enable addrress0

//Initial value for CRC calculation.
NRF_RADIO->CRCINIT = ((uint32_t)seed[0]) | ((uint32_t)seed[1])<<8 | ((uint32_t)seed[2])<<16;
	
NRF_RADIO->DATAWHITEIV=37;
	
NRF_RADIO->FREQUENCY = CHANNEL_IDX_TO_FREQ_OFFS(37); // ERIC
	
NVIC_EnableIRQ(RADIO_IRQn);

}

Snippet that actually sends

	NRF_RADIO->EVENTS_DISABLED = 0;
NRF_RADIO->TASKS_DISABLE = 1;
while(!NRF_RADIO->EVENTS_DISABLED);     //wait for radio to be disabled

NRF_RADIO->EVENTS_READY=0;					 //clear flag
NRF_RADIO->TASKS_TXEN=1;						 //enable radio in TX mode
while(!NRF_RADIO->EVENTS_READY);     //wait for radio to be in tx mode

NRF_RADIO->PACKETPTR = (uint32_t)&thisdata;

NRF_RADIO->EVENTS_END = 0;					 //clear flag
NRF_RADIO->TASKS_START = 1;  		     //its ready start task
while(!NRF_RADIO->EVENTS_END); 	     //wait for radio to send

//clear event
NRF_RADIO->EVENTS_DISABLED = 0;
NRF_RADIO->EVENTS_END = 0;
NRF_RADIO->EVENTS_READY=0;

RE: Odd behavior in tx radio and rx radio pairs

ovrebekk — Wed, 28 Jun 2017 09:12:21 GMT

Have you tried to use a phone to receive the adv packet, to see if the issue is the same (or if the packet can even be received) ?

If you have an Android phone the nRF Connect app from Nordic allows you to see the raw data from an advertiser.

Are you able to share the code you used to transmit the adv packet?
Then I can take a look and see if there is something there that could explain the issue.

Best regards