CC1200: RX bit rate and other settings?

If the established network is of newer data (last 15 years or so) the datarate is most likely set by a crystal and therefore the tolerance should be tight. I would suspect other settings. 

Would you be able to post how you have set up the radio now? 

If you have used SmartRF Studio to try to receive the packets on the network, please post a screendump of the SmartRF Studio window so I can see how the bi errors look like. 

Hi Ter

Thank you very much for your reply. Truthfully right now its a little bit of a mess as I have been trying to (unsuccessfully) tweak settings. I will have this ready with (hopefully) your next reply. Both sides are crystal controlled. One is based on a 25MHz crystal while the TI solution is 40MHz. While the absolute values will be tight I wondered if they are unable to reach the same values, perhaps the steps are too large, This could go for the actual RF frequency as well. 

Many others have the ability to change this setting(at least in OOK mode, not sure if this setting is for the 2GFSK). Are there any settings like this? I go have a good go at it then post my best attempt. Please note the data is whitened with a different algorithm that TI use. I can't see anyway to change that either. 

Kind regards

"unable to reach the same values": Not sure what exactly you are referring to here. 

To be able to help you I would need more data since at this point I have no knowledge of how you are trying to set up the radio. 

Hello Ter

Thank you again for your reply and I understand. I will try and provide you with everything. I don't appear to be able to paste in screen grabs, but will paste in what I can.

My settings

Frequency = 433.42Mhz

Symbol rate = 25 kbps

Bit Rate = 25 kbps

Deviation = 15 kHz

Preamable 0xAA.....

Sync Word AAAAAAAB

Preamble count = 3 bytes

What I receive

I only get a message when I should. However it of course looks wrong. I know the other end is data whitened, however I would expect the first nibble of the data to be consistent at least - I could be wrong on that point, but from my understanding that should be the case. 

07:45:10.065 | aa aa aa aa aa aa aa aa aa aa aa aa aa a9 99 99 99 95 56 aa a6 aa 56 aa aa aa aa aa aa aa aa a9 6a aa 69 6a aa aa a5 9a a9 95 65 66 96 55 aa 65 5a 6a 66 69 a9 96 66 5a 5a 9a 96 5a aa aa aa a9 69 9a 5a 54 b6 bf b9 eb 51 bb c3 56 e4 a2 56 b2 8e 68 eb ff f5 f6 a5 f1 d8 8a 56 db 52 b5 5b 6d 2d 72 8d 5a | -36 CRC error

07:45:10.990 | aa aa aa aa aa aa aa aa aa aa aa aa a9 99 99 99 95 56 aa a6 aa 56 aa aa aa aa aa aa aa aa a9 6a aa 69 6a aa aa a5 9a a9 95 65 66 96 55 aa 65 5a 6a 66 69 a9 96 66 5a 5a 9a 96 5a aa aa aa a9 69 9a 5a 54 cd ff 7e 56 d7 5f eb ed 55 92 3b 0e c6 1a 35 5f 88 e9 1a aa 6a 51 58 aa 83 d4 77 4a a1 62 d4 f6 a5 | -37 CRC error

07:45:12.268 | aa aa aa aa aa aa aa aa aa aa aa aa a9 99 99 99 95 56 aa a6 aa 56 aa aa aa aa aa aa aa aa a9 6a aa 69 6a aa aa a5 9a a9 95 65 66 96 55 aa 65 5a 6a 66 69 a9 96 66 5a 5a 9a 96 5a aa aa aa a9 69 9a 5a 54 bf 1f d2 aa bb 65 75 ac ed a9 21 b5 0e ea e2 eb d3 a6 5b b9 f5 92 94 95 ac a8 c8 29 ad 05 52 cd 94 | -30 CRC error

07:45:13.435 | aa aa aa aa aa aa aa aa aa aa aa aa aa 66 66 66 65 55 aa a9 aa 95 aa aa aa aa aa aa aa aa aa 5a aa 9a 5a aa aa a9 66 aa 65 59 59 a5 95 6a 99 56 9a 99 9a 6a 65 99 96 96 a6 a5 96 aa aa aa aa 5a 66 96 95 26 37 ee 37 a6 d2 be 5b 68 53 55 4a d5 34 5a 4b 55 45 48 cd 69 66 ad ab 6a af 68 ab ad 4a a9 4c 66 | -30 CRC error

07:45:14.557 | aa aa aa aa aa aa aa aa aa aa aa aa aa 66 66 66 65 55 aa a9 aa 95 aa aa aa aa aa aa aa aa aa 5a aa 9a 5a aa aa a9 66 aa 65 59 59 a5 95 6a 99 56 9a 99 9a 6a 65 99 96 96 a6 a5 96 aa aa aa aa 5a 66 96 95 1e ef ff fa b6 b6 9a ec a8 d6 b5 5d 55 36 a6 cd a8 96 d6 ac 9f 2b 6c dd a1 2a 2a b5 7c a2 24 8b aa | -30 CRC error

07:45:15.572 | aa aa aa aa aa aa aa aa aa aa aa aa aa 66 66 66 65 55 aa a9 aa 95 aa aa aa aa aa aa aa aa aa 5a aa 9a 5a aa aa a9 66 aa 65 59 59 a5 95 6a 99 56 9a 99 9a 6a 65 99 96 96 a6 a5 96 aa aa aa aa 5a 66 96 95 3e d7 ff ae ff 5a 6d be 6f 4d d5 54 ab 4d 56 4b 55 69 2a d8 92 4a 25 cb d6 a7 ed aa 46 eb 52 ab 65 | -30 CRC error

07:45:16.588 | aa aa aa aa aa aa aa aa aa aa aa aa a9 99 99 99 95 56 aa a6 aa 56 aa aa aa aa aa aa aa aa a9 6a aa 69 6a aa aa a5 9a a9 95 65 66 96 55 aa 65 5a 6a 66 69 a9 96 66 5a 5a 9a 96 5a aa aa aa a9 69 9a 5a 54 bf 5b 5b 3a aa ba aa e1 55 10 ad 35 df 0d 2a 9b 55 6a 8b 52 1a ae d5 1b 76 63 29 ae b6 b1 c8 a6 55 | -30 CRC error

07:45:17.962 | aa aa aa aa aa aa aa aa aa aa aa aa aa 99 99 99 99 55 6a aa 6a a5 6a aa aa aa aa aa aa aa aa 96 aa a6 96 aa aa aa 59 aa 99 56 56 69 65 5a a6 55 a6 a6 66 9a 99 66 65 a5 a9 a9 65 aa aa aa aa 96 99 a5 a5 4f d7 5b 33 d7 23 ae b2 b5 70 4d 3d ad ed 59 aa be a5 e5 42 55 11 71 b6 d6 ca b1 98 dc 89 49 ae 1c | -28 CRC error

My registers

IOCFG2 06

SYNC3 aa

SYNC2 aa

SYNC1 aa

SYNC0 ab

SYNC_CFG1 a8

DEVIATION_M 89

MODCFG_DEV_E 0a

DCFILT_CFG 5d

PREAMBLE_CFG0 8a

IQIC cb

CHAN_BW 87

MDMCFG1 40

MDMCFG0 05

SYMBOL_RATE2 84

SYMBOL_RATE1 7a

SYMBOL_RATE0 e1

AGC_CS_THR ec

AGC_CFG1 51

AGC_CFG0 87

FIFO_CFG 00

FS_CFG 14

PKT_CFG2 00

PA_CFG0 54

PKT_LEN 64

IF_MIX_CFG 1c

FREQOFF_CFG 22

FREQ2 56

FREQ1 af

FREQ0 1a

IF_ADC1 ee

IF_ADC0 10

FS_DIG1 07

FS_DIG0 af

FS_CAL1 40

FS_CAL0 0e

FS_DIVTWO 03

FS_DSM0 33

FS_DVC0 17

FS_PFD 00

FS_PRE 6e

FS_REG_DIV_CML 1c

FS_SPARE ac

FS_VCO0 b5

XOSC5 0e

XOSC1 03

PARTNUMBER 20

PARTVERSION 11

MODEM_STATUS1 10

The sync word in your network is not a good sync word seen from the CC1200 side. Minimum would be to tun on strict sync (SYNCC_CFG0.STRICKT_SYNC_CHECK = 0x10) to be able to detect the start of the packet.

Have you set AGC_REF according to your RX BW?

Looking at what you receive and based on the sync word: Does the old network use manchester coding?

Hi Ter

Thank you again. 

I have set "02 : Strict sync word check level 1" (I have tried all modes, it is now locking on in about 80% of cases to something. There is more consistency). During this I found out that my Sync bits where upside down, so the Preamble is actually 0x55... (instead of 0xAA...) And Sync is now 55,55,55,54 (unless it is this way even setting 1 will not work). 

As my RX Filter BW is 60Khz I have set the AGC_REF from the default of 0x36 to 0x27

On your question on Manchester encoding. I understand it is not, but I do have a doubt here. I have experimented with it and the data does not look right in that mode either. I think the first step is of course to get the consistency up. For the same packet I should see the same bytes. 

I ask here about settings for absolute levels in the RF chain for bit 1 and bit 0, also about RF bitrate tolerances. 

Here is what I picked up...

08:26:58.047 | cc cc cc ca ab 55 53 55 2b 55 55 55 55 55 55 55 55 54 b5 55 34 b5 55 55 52 cc b4 d2 b5 34 b4 b3 53 33 4d 4c d2 ca ad 2b 2b 54 ad 35 4d 35 55 55 55 55 2a ac d3 34 3d 3f f5 b5 45 97 eb fb 5e a7 d5 e8 7a b9 8e 7d 78 e7 fd f5 fd ef 77 e5 ff bd bf 7d e5 f5 bb e9 fa fe fb 9c 3f f5 8c 77 23 e4 fd dd 6a d7 3b f1 ed 5e fb dd 7a ff 76 b1 12 aa ad b5 e5 ca 6c a9 59 12 8c 69 bf 53 55 ac 50 59 57 c9 51 92 52 91 54 88 a2 9c fa a1 42 8e a6 24 a0 6a d2 25 1a 48 c6 d5 57 96 09 47 51 dd 75 55 57 54 8c 6d d1 6d 03 12 fa d6 ad a5 51 04 d5 eb 6a 6c b4 2c da 42 94 75 6b 5a f5 3b 14 a5 a7 4a b5 b6 d6 7a 5a aa d0 29 b5 2d 52 2a c9 4c eb 35 5d c5 aa 54 a2 a3 67 ea 5a 9a 25 ac 2a d4 df ca 7a b5 f6 ae a4 b5 33 f5 6a 8c a4 29 a5 55 de db 50 aa 91 29 5d 12 35 59 55 d4 6a ae d1 b2 | -41 CRC error

08:26:59.114 | cc cc cc ca ab 55 53 55 2b 55 55 55 55 55 55 55 55 54 b5 55 34 b5 55 55 52 cc b4 d2 b5 34 b4 b3 53 33 4d 4c d2 ca ad 2b 2b 54 ad 35 4d 35 55 55 55 55 2a ac d3 34 5e de ae f2 af 75 72 e3 57 6d b9 5b 2b 55 5a 91 55 56 b5 a9 2a 56 aa a7 76 6a d6 b4 95 95 b9 75 35 55 65 4e 59 53 5b aa aa aa b5 51 68 a8 e4 d3 36 ae d1 d5 5a 5a b5 56 b5 6a a9 12 ab 5e 9a 4a 69 94 8d 45 67 4b 2c a2 a7 2b 67 eb 55 11 52 a5 49 29 c6 a4 bd a9 55 58 29 2a aa a9 65 d3 52 35 1a aa d9 1b 29 93 4d 35 55 6b 4c ed ab 25 66 16 d5 a5 4e 48 1a 2d ab 0f 57 55 85 31 82 2c d6 4d 51 aa d2 48 7a b6 d6 d9 29 0a 6d 2e ad 6b 58 aa de 55 6e b5 6c cb 79 28 a9 55 ac 35 31 bf 55 b1 55 6e 92 4a 1c ae ed 1a a5 2d 3b ff 5f 3b bb ef 5b 3d 55 5a f6 ea 30 b9 55 9f c7 c9 5c d7 ac 4b ca c7 d0 ab 54 2a b5 95 | -42 CRC error

08:27:00.200 | cc cc cc ca ab 55 53 55 2b 55 55 55 55 55 55 55 55 54 b5 55 34 b5 55 55 52 cc b4 d2 b5 34 b4 b3 53 33 4d 4c d2 ca ad 2b 2b 54 ad 35 4d 35 55 55 55 55 2a ac d3 34 7f bd e9 7b dd 5d 35 f9 6b 56 b6 b6 af d5 a5 29 36 e5 52 2a a8 55 52 b3 42 c9 6b a5 5b 3a aa b7 eb 4d ae ab 2d 55 49 0a 92 a4 9a aa 6a b2 b9 35 a6 ad c2 5c ad 75 44 1a ea b6 50 b3 2a d5 d5 55 65 8d ad a5 ea 9e 99 52 be 89 84 35 54 aa c4 a5 42 ad 62 5d 2a a5 6a ab 6a d0 97 05 25 53 41 55 d5 56 eb 6b 76 7a ad 6f 3d ad 64 ba 92 ec 71 a5 59 05 5a 5a d5 2d 42 ba d5 95 2a 62 aa c4 54 d5 2c 11 2d fa cf 9f 57 55 b5 a8 a9 01 58 ca 45 ea d5 ae ca bd fb ef 5e d8 cd cb f5 97 ba 45 ba e8 ed 55 31 34 35 f6 b1 27 f5 aa 77 2f 36 68 95 bb d7 34 d2 a9 3a ea cf 5b d7 17 2a fa 88 ca 0d 52 a8 52 ca 11 42 9d df a3 | -42 CRC error

08:27:01.604 | cc cc cc ca ab 55 53 55 2b 55 55 55 55 55 55 55 55 54 b5 55 34 b5 55 55 52 cc b4 d2 b5 34 b4 b3 53 33 4d 4c d2 ca ad 2b 2b 54 ad 35 4d 35 55 55 55 55 2a ac d3 34 3f 5e b3 7b 69 ff 7d ad 6b 53 5f 75 6b 52 a9 97 6e d5 ad 6a 2a 8d bb 50 a5 42 55 59 4d 96 b6 92 54 e4 94 b7 55 a9 78 b5 2b 44 aa ac 2a aa 6a 86 d4 5b a4 50 95 45 65 ab d5 bc db 7a cb 7f 7d 6b ba ba d5 6a 36 b8 5e b2 b9 52 dd 5b 75 ab 56 8d 2a b1 22 2a fd 5b aa de c0 a7 ea fd ea a5 36 95 69 53 74 b6 cd 6d 71 6d 52 e5 36 ae 15 c3 6b 55 57 55 fa a6 fb 5e b2 da 6e bf 54 ab 62 80 aa aa ab d4 99 d3 4b af ed 54 a2 ae 55 d4 d1 54 a9 55 a9 55 4a ea d4 cd 56 12 5e 52 5a d1 aa d7 26 cd b5 ac ab 9b 55 b5 4b 4d 55 34 b2 91 b6 18 b4 44 ba b5 49 54 b7 56 a7 96 ea ab 25 49 d5 7b 8b 55 a5 5a a5 ca ca 56 64 76 | -42 CRC error

08:27:02.886 | aa b3 4c d1 eb 7f 76 6f e1 28 ba c4 ac b0 5a 92 aa aa b0 aa d1 fb 45 ac 94 ab 47 16 a3 28 a9 54 6d e5 47 56 a5 d1 2b 48 aa 04 72 f4 53 2e d5 22 d5 62 ac de 4a aa bb 49 3b 25 42 d6 a1 4a aa a3 52 9a ad 6d 55 45 4a 95 55 4a 48 aa aa 6b 6b 4b aa b5 62 ae bd 53 dd 6b 44 85 ab 6c a8 96 ad 21 b4 a7 2a 94 ad 48 55 52 aa d4 8b 56 c5 a9 29 75 49 55 6a 9a 21 01 54 ee ec 53 d2 56 1a d5 b9 4a b5 a6 1a ab 49 a7 56 b6 cb 5b 5a 6e f0 b4 aa 55 68 28 ac 9d 56 a3 26 d2 5d b3 cc d5 54 82 94 ab 29 21 a8 a3 75 54 f9 83 6d 79 7d 57 6a a6 d2 7a ad 5a aa b2 95 2a a3 d2 54 1b 34 2d 14 54 48 d5 b5 95 51 6b 38 c9 97 55 55 4b 6a ac ad 89 34 6e 53 94 55 56 b5 b1 a9 d4 aa b4 4c 4e 44 e9 89 f6 b9 9f b3 eb eb 0b 6d 52 2e 9a c7 2d 2a 82 a9 32 60 aa fd de 9f b5 48 d0 2e 74 d3 56 b5 31 | -42 CRC error

08:27:03.934 | cc cc cc ca ab 55 53 55 2b 55 55 55 55 55 55 55 55 54 b5 55 34 b5 55 55 52 cc b4 d2 b5 34 b4 b3 53 33 4d 4c d2 ca ad 2b 2b 54 ad 35 4d 35 55 55 55 55 2a ac d3 34 3b fb 5a b7 46 ea d5 2c 29 a2 9d 35 cd a9 52 15 2b ba ba 64 d8 ab d4 ab b6 84 2a a6 2c d2 c4 d0 52 d1 46 52 a9 55 6a 5a 51 76 55 0b 6a 2a a7 7f f5 6c 5e ed ab 0a 89 65 ad 4b 52 d5 9b 37 57 c0 a6 da ed 52 ab 6e a5 1a a5 3a 8a 57 4a 85 54 97 34 ed 2b 62 ba 9b 9f 28 6a d6 aa 9a d6 da 7d eb a5 2c 52 a1 64 5a aa 85 50 ab c8 19 2a 3a 92 6a 35 52 ac 4d ad 19 da a9 b6 ef 85 97 a5 49 4a b4 b2 91 aa ab 1d 62 ba a4 92 6a a2 2b 4d a0 ae 89 8b f8 d5 86 d1 55 a2 56 4d 4a b3 94 55 76 b5 31 55 a4 d4 2d a3 5a ad 4f 65 a2 52 d4 ad 62 b6 ea d7 5c b5 99 57 ea 5d 7d b6 2e 2c d2 98 a2 a9 31 ab 19 53 07 a6 b6 52 b4 | -42 CRC error

My registers are:

IOCFG2 06

SYNC3 55

SYNC2 55

SYNC1 55

SYNC0 54

SYNC_CFG1 a8

SYNC_CFG0 02

DEVIATION_M 89

MODCFG_DEV_E 0a

DCFILT_CFG 5d

PREAMBLE_CFG0 8a

IQIC cb

CHAN_BW 87

MDMCFG1 40

MDMCFG0 05

SYMBOL_RATE2 84

SYMBOL_RATE1 7a

SYMBOL_RATE0 e1

AGC_REF 27

AGC_CS_THR ec

AGC_CFG1 51

AGC_CFG0 87

FIFO_CFG 00

FS_CFG 14

PKT_CFG2 00

PA_CFG0 54

PKT_LEN fe

IF_MIX_CFG 1c

FREQOFF_CFG 22

FREQ2 56

FREQ1 af

FREQ0 1a

IF_ADC1 ee

IF_ADC0 10

FS_DIG1 07

FS_DIG0 af

FS_CAL1 40

FS_CAL0 0e

FS_DIVTWO 03

FS_DSM0 33

FS_DVC0 17

FS_PFD 00

FS_PRE 6e

FS_REG_DIV_CML 1c

FS_SPARE ac

FS_VCO0 b5

XOSC5 0e

XOSC1 03

PARTNUMBER 20

PARTVERSION 11

MODEM_STATUS1 10

Kind regards

Bryce

Meaning that you don't have full overview over the settings used in the original network? 

Hello Ter

Just to clarify, I do have a full overview, but the program used by the other manufacturers setting program is a bit buggy. Manchester encoding is set to off, however after looking at the RF data, I do have a doubt about it. 

Kind regards

Ok, I will wait until you have double checked all settings. When you are sure that what is shown in the GUI of the setup program is the same as you have on the air, could you post a screenshot of the setup? 

Hello Ter

I'm sorry for any confusion. The settings I have given are the setting I believe they are. There was a bug in their setup tool (the other IC manufacture) with another setting. An therefore I have lost some confidence with it. However the settings are what I have given you (assuming the tool is working correctly). I'm just trying to give you as much information as possible, without giving you settings that would be confusing or side-track this. The "old" network has never had to be interfaced to another manufacturers IC before, so this has never come up. 

Can we please proceed as is? At the very least Manchester coding or not, the data should be consistent. Its more of a secondary point, or next stage problem, I would think? I don't think there are any other settings relevant to the TI solution. If I haven't given you something in the RX chain that may be needed then please let me know. I know that I am using data whitening for example, but again the data should at least be consistent. I think the first step is to at least get consistent RX data. Though, thanks to you, we have made great progress in that area already. 

Kind regards

How many bytes preamble do you have, would you be able to use PQT? The issue with your sync word is that it's easy to find a false sync since what you are looking for is just one bit differently from preamble. Adding PQT could help to avoid some false syncs.  

A false sync will cause the bit/ byte sync to slide some and  hence you are not seeing the exact same every time. 

Hello Ter

Thank you, I understand your concerns and why I am seeing what I am seeing. We currently have a pre-amble of 8 bytes. I am unsure of how I adjust the PQT. I had not heard of this until you mentioned it. 

To keep you in the loop, as it may be important now. The final goal is to make this a wake on radio solution. I thought it is best to get it working in the easiest form first and then try and implement this. Therefore we may be able to, or have to, make a global change to increase the pre-amble (for battery life reasons). Though unfortunately we would not be able to change the sync-byte. 

Kind regards

Bryce

See PQT gating under "Byte Synchronization, Sync Word Detection" in https://www.ti.com/lit/ug/swru346b/swru346b.pdf

Hello Ter

Thank you for this, during my implementation of this I think I have discovered a bug in SmartRF Studio 7 which is at least masking any other issues. I have been using it as follows...

I go to the Packet TX tab and setup things like my Sync Byte and me Preamble. I then click on the Packet RX tab and receive the packet. What is happening is that by doing this the Premable is always reset to 0xAAAA... You can see this in the byte PREMABLE_CFG1. It appear to be impossible to actually use the SmartRF Studio 7 GUI to receive any other preamble than 0xAAAA... 

If I manually set... PREMABLE_CFG1 to 0x15 in the Register view (after I've clicked on the Receive tab) and before I click "Start" then I get consistent data (please see below)

I understand I have not implemented your PQT changes at this point. I though it would be wise to ask you at this stage. For all I know their are other bugs that are changing other setting. 

After this is resolved and I've looked at PQT, my next question after all this is: Am I able to change the Data Whitening equation? I could not see how to do this.

11:27:38.223 | cc | 52428 | ca ab 55 53 55 2b 55 55 55 55 55 55 55 55 54 b5 54 d3 55 2a d2 b2 ab 34 d5 32 d5 2a d4 aa ad 32 ad 2a ad 33 2b 33 4d 4b 55 4a ad 55 55 55 54 cc d2 ab 2c 35 54 ad a9 64 ab 5a ad 09 6e 95 55 ac bd 55 41 45 a9 5b 75 55 55 56 d5 2a d6 ab 57 51 d6 aa a9 5b ba d5 75 5a a5 55 8c a5 2a b4 e4 55 56 f5 b6 b5 59 12 95 12 a9 29 55 15 1a 93 6a a6 d6 55 55 d1 4a 95 aa 5a ba ab 6d 14 da ad 5b 6d aa d2 3d 35 4d 54 a9 41 5c 9a 94 ab 4c a5 67 d2 9a ab 55 2a 55 6a 5a 7a 9b 2d 36 b5 22 aa ae ad b5 54 b5 57 27 55 29 51 2a 41 2a a8 25 25 75 05 6a a4 aa 4d 94 ad bd ab 53 53 5b b0 53 b6 e4 ab 54 d4 aa a9 51 6d a9 55 a8 6d | -28 CRC error

11:27:39.491 | cc | 52428 | ca ab 55 53 55 2b 55 55 55 55 55 55 55 55 54 b5 54 d3 55 2a d2 b2 ab 34 d5 32 d5 2a d4 aa ad 32 ad 2a ad 33 2b 33 4d 4b 55 4a ad 55 55 55 54 cc d2 ab 2c 52 b2 92 56 d5 54 ea 12 86 6d 6a aa ab 49 50 a9 56 53 54 15 a5 4a 2a aa aa 55 42 a5 4a a8 a5 69 52 95 65 66 8a aa 57 d4 89 14 ec d4 ab 76 b5 55 d9 b6 b9 b5 57 6d ab 75 55 ad 2a da ba 96 ae a0 ad 0b 36 a5 59 51 55 b5 6a a9 55 6b a5 29 50 55 bb 99 4a aa 86 a5 95 54 aa da c2 b5 5b 55 55 db 54 e5 47 25 69 d2 c5 55 ab 2a aa cb 95 2b 45 b4 af 6b 51 aa ab 6a a2 d5 69 a5 55 53 15 45 46 a9 ab 51 a9 52 b5 35 6a f6 aa eb 5a 54 ab ab 5b 52 aa aa d5 ad 4a aa aa | -30 CRC error

11:27:40.779 | cc | 52428 | ca ab 55 53 55 2b 55 55 55 55 55 55 55 55 54 b5 54 d3 55 2a d2 b2 ab 34 d5 32 d5 2a d4 aa ad 32 ad 2a ad 33 2b 33 4d 4b 55 4a ad 55 55 55 54 cc d2 ab 2c 74 aa 2a 49 55 b4 95 6a ad 56 5d 4c aa 55 6a d6 aa b5 5a d5 56 95 4a b5 95 15 95 55 69 14 94 aa 56 a9 6a a0 a5 56 b5 6e a9 aa d2 d2 da ca ca 6a aa ac aa 97 52 a6 5b 6d 6a a5 29 5b 55 5a 52 aa 8a aa aa aa a8 94 d5 54 94 2b 4a b5 0a d6 eb 4a 6a ab a4 aa 95 55 2d 25 ac b5 5d aa ac da 56 a8 b5 5d 55 6a aa a2 41 14 a4 2a a5 4a 0a 50 aa a5 54 6a 9a b5 14 a9 5a ab a9 6b 4a d5 07 55 56 aa ba ac 6a d5 65 6a a4 aa ba ac 54 d6 db 6a 51 55 52 a5 09 53 2b 55 45 | -30 CRC error

11:27:41.792 | cc | 52428 | ca ab 55 53 55 2b 55 55 55 55 55 55 55 55 54 b5 54 d3 55 2a d2 b2 ab 34 d5 32 d5 2a d4 aa ad 32 ad 2a ad 33 2b 33 4d 4b 55 4a ad 55 55 55 54 cc d2 ab 2c 35 4b ac 48 52 ed 55 55 9b 6a 8a aa a4 92 5a 15 aa a9 4b 48 ac ab 51 6a ca aa cd 56 d5 29 ad 56 b3 52 a4 9d 54 55 54 b9 56 a8 52 95 aa 95 55 2f 59 5b 25 6f 4a ee b5 56 a8 a5 29 55 ea ae a9 f6 aa be b6 ad a9 6a a3 56 da b6 6d dd 7e eb b5 af da ea ee 7a b6 d5 75 57 5d b7 6c 54 b5 95 aa 95 55 7b 9c aa aa da d6 35 6b b5 79 49 96 d7 75 6a d9 47 a2 c4 ea d5 69 aa d5 97 55 55 75 72 d5 35 96 a5 29 6e d5 4b 6d ad 55 5a ae cd d3 4b aa ab 56 55 51 4d 6a d5 6a | -30 CRC error

11:27:43.014 | cc | 52428 | ca ab 55 53 55 2b 55 55 55 55 55 55 55 55 54 b5 54 d3 55 2a d2 b2 ab 34 d5 32 d5 2a d4 aa ad 32 ad 2a ad 33 2b 33 4d 4b 55 4a ad 55 55 55 54 cc d2 ab 2c 29 95 29 6b 34 aa 15 a5 a2 a5 5a 6c a8 aa 5a ad 28 92 95 45 4d 56 59 96 e5 55 55 aa a5 7a ad 6d 6b 53 ad aa ab db 6a eb 5a ba dc d6 ae d1 a5 eb 4d 55 d5 ab ab 55 fb 5d 2a b6 52 ba d5 2f 6a a5 b5 b5 7d 6a ab aa f3 15 b5 f5 56 2b 57 b6 af bb 6e f6 a0 55 9a bb 75 6e b5 ab 4d d5 76 ca aa aa ea a2 aa b5 56 b5 5c 55 6d 55 d5 2e ea a1 0a b6 aa 57 6e a5 5a b1 55 4a aa 54 52 aa aa 95 5a 4a 55 5b ea b6 6e 53 2a d5 5a d5 52 3a 97 59 57 56 a8 d5 55 ca 4a 55 4b | -30 CRC error

11:27:44.002 | cc | 52428 | ca ab 55 53 55 2b 55 55 55 55 55 55 55 55 54 b5 54 d3 55 2a d2 b2 ab 34 d5 32 d5 2a d4 aa ad 32 ad 2a ad 33 2b 33 4d 4b 55 4a ad 55 55 55 54 cc d2 ab 2c 22 a9 52 41 50 aa d5 5a 6b 72 ba ae 8a 54 94 96 a2 ad b4 55 aa aa 80 aa ab 49 55 aa e9 8a aa aa 95 55 f5 20 aa ad 68 51 55 55 2d 57 55 55 bd 59 52 ab 44 4e b5 15 55 aa aa 9a 96 95 5a d2 8e d4 d2 52 a5 b5 52 4a b6 aa a5 4d 55 a1 55 81 52 95 59 15 51 4a a8 9a 4a 94 55 29 15 45 2b b3 51 15 69 69 61 5d 56 aa 53 5b 50 aa ce d5 55 54 2a d6 ad b6 a6 b2 a4 8a ae ad ad b4 ca ad 55 6a 96 a2 ba 55 59 5e a5 5a 97 6e aa ad 4b aa 96 95 79 2a da 55 aa 95 6a 6a a5 | -31 CRC error

11:27:45.367 | cc | 52428 | ca ab 55 53 55 2b 55 55 55 55 55 55 55 55 54 b5 54 d3 55 2a d2 b2 ab 34 d5 32 d5 2a d4 aa ad 32 ad 2a ad 33 2b 33 4d 4b 55 4a ad 55 55 55 54 cc d2 ab 2c 32 54 b4 01 52 6a 96 aa eb 56 ce 55 b2 ab 56 d5 55 55 6d 75 ab 47 56 a9 55 4a b9 75 55 0a d5 a9 28 aa 94 8a 95 35 15 55 55 72 95 14 a6 ae aa ce aa ad 5a aa ac aa d5 2a d4 0a 56 aa 96 8a 6a a8 d4 aa ad aa 96 ca aa 95 55 6a 95 76 f0 2c d5 e5 6a ea a5 4a 51 53 4a c6 94 54 95 54 55 aa a2 a6 6b 4b 4e ca ab b6 a5 57 54 4a a4 ae d5 69 4a 48 aa b5 a4 62 aa 2a 55 55 ad 55 29 2a a3 52 d4 a9 10 aa 55 09 db d8 75 69 4a 8d 55 55 b5 55 49 56 ad 12 65 43 a6 b5 4a | -30 CRC error

11:27:46.438 | cc | 52428 | ca ab 55 53 55 2b 55 55 55 55 55 55 55 55 54 b5 54 d3 55 2a d2 b2 ab 34 d5 32 d5 2a d4 aa ad 32 ad 2a ad 33 2b 33 4d 4b 55 4a ad 55 55 55 54 cc d2 ab 2c 75 5a aa 54 55 5e 56 94 d9 52 aa 4a cf 29 4d 68 0a 48 9d 2e b2 56 b7 5a aa aa d5 ae d5 d9 55 6a 15 55 6a 92 aa aa aa 64 29 68 56 80 2a b2 92 aa a6 c4 b3 56 b5 4a 68 a5 4a 95 2a 15 4d 6b aa a5 2a b5 85 53 50 aa ad a4 ad 45 55 24 d3 a6 2a a9 59 4a 2a 9a b4 5b 52 a9 54 8c aa 6a ec d5 b5 6e 96 3b df 76 55 55 55 e5 6b 5a ba f7 2e aa 56 9a aa 95 49 aa ab 5a ac ad 75 6b 55 aa a5 3b 74 bb 5a ed 2a b1 b5 55 ad 2d 55 ad 6b 55 55 ed 55 fa 5b 4a eb 55 ae fb 2a | -31 CRC error

Kind regards

PREMABLE_CFG1 is only used in TX in his case. Since if you haven't turned on PQT the chip doesn't look for a given preamble or a given number of preamble.

Is this the only change you have done from a device that receive random data to a device that receive what you want? 

Hello Ter

Initially yes, this was the only change. This setting makes a huge difference. I also found bugs with the register MDMCFG1. This controls if the data is inverted(which I ended up needing). I think there are other bugs in this program but I haven't managed to narrow it down yet. Once I got the data consistent it wasn't too hard to get the device to receive and decode the data correctly. I've just finished testing and I can say that it now picks up every packet correctly. 

So, now I go into the "RX Sniff mode" tab. I then click "Start Packet RX". I can get one packet then it appears to stop receiving more packets until I stop and start it up again. I also can't see the packet that I received.  Do I need to click on something to reset it each time? Can I see the packet that is received? I can't see anything about this in the "Help" section. 

Thanks again

It's not clear if you selected the correct tab?

Hello Ter

I was not looking at the correct tab! Unfortunately this didn't help me. I've been trying to work out why but I haven't got very far.

I get everything working and can see it all in Packet RX, everything is working great. Then I click on the RX Sniff Mode(and Packets) and 95% of the time I don't see any packets. (Perhaps one). I then go back and click on Packet RX and it doesn't work. 

I suspect this is another bug in this program and it is changing a register somewhere, but I can't work out which register it is. 

Kind regards

Bryce

When doing sniff mode the preamble has to be long enough compared to the sleep periods. Have you take this into consideration? See  for details on sniff mode.

Hi Ter

Good point, but unfortunately I was already aware of this. When it does work it instantly gets a packet (almost as soon as I switch tabs) then then nothing... No matter how long I wait. I then click the RX packet tab again(which was working) and this now no longer works. I'm absolutely convinced this is a bug in this program(to be fair I have found 2 already). Can I ask what registers are affected by moving between RX Packet mode and sniff mode? If I understand what is changing then perhaps I can go through each register and see why it is failing. 

Thanks again

Bryce

Hi Ter

That document does list the registers that might change! I will try and look through each one and see what is going wrong. 

Kind regard

Bryce

Hi Ter

I've WinMerged my way through it and I've found the one bit that makes or breaks it is "TERM_ON_BAD_PACKET_EN" in the register RFEND_CFG0. Setting this makes it work while if I clear it, it doesn't.  I think what is happening is that if the device does not see a packet it likes it comes out of receive mode permanently. Obviously in any RF network there would be corrupted traffic from time to time, so I guess there must be a setting for this. 

I'm not 100% if by disabling this I have in effect disabled wake on radio, and hence that is why it is working. 

Thanks again

Bryce

Hello Ter

Firstly thank you for all your help so far.

I'm just wondering if you have any thoughts?

Thanks

Bryce

Not sure why you are seeing this, on my end it looks like the sniff mode tab works as a normal packet rx tab.

Does this also happen if you are using one of the default settings?

Hi Ter

Unfortunately I only have one board and this is listening to the third party device.  I don't really have a way of getting a default link going. It appears that there is either a bug in the SmartRF Studio and/or I am using the chip incorrectly. Or the chip doesn't work as I think. Does it come out of sniff mode if the packet has(what it considers an error?).

At this point the only was I can independently move forward is to attempt to measure the current draw of the unit. That way I can determine if it is actually going into sleep mode. However I don't have a practical way of achieving this.

Kind regards

Bryce 

Hi Ter

I was just thinking. This is going to be rather hard to figure out remotely. I'm happy to ship you some hardware(just a keyfob). That way we can have the same hardware setup. I'll of course send you my files for configuration. How does that sound?

Kind regards

Bryce

This depends on the volume potential of the project since taking custom hardware into the lab always takes a few hours. 

Hi Ter

Is there a way we can talk privately? As, of course, this starts to get a little confidential. 

Kind regards

Bryce

You can send me a friend request and after that it's possible to send private messages. 

Hi Ter

Thank you I have done this. 

Kind regards

Bryce

I have accepted the request.