CC1310: RX filter bandwidth in Long range mode

Hi Sverre,

How to read the value of DEMMAFC0? (I get undefined error message from CCS and I can't fine it from the technical reference manual.)Thansk.

Hi Sverre,

To read the RF frequency offset, I make some modification on example code of rfWsnConcentrator as below. However, I always get 0x81 even the reciving frequency changed. to comfirm it, a CC1101 reviever is used as a sniffer, and it shows -9 to +9 accordingly when  rfWsnNode is sending packages with different frequencies.

Could you please guide me through of it? Thanks.

1) Define a function in EasyLink.c

rfc_CMD_READ_RFREG_t RF_cmdReadRfRegRfOffSet ={
.commandNo = 0x0601,
.address = 0x5154,
};

int8_t ReadRfOffSet(void)
{
    int8_t RfOffSet;
    RfOffSet = (int8_t)RF_runImmediateCmd(rfHandle, (uint32_t*)&RF_cmdReadRfRegRfOffSet);
    return RfOffSet;
}

2)  Add this line in EasyLink.h

extern int8_t ReadRfOffSet(void);

3)  Call the function in rxDoneCallback

static void rxDoneCallback(EasyLink_RxPacket * rxPacket, EasyLink_Status status)
{

    /* If we received a packet successfully */
    if (status == EasyLink_Status_Success)
    {
        /* Save the latest RSSI, which is later sent to the receive callback */
        latestRssi = (int8_t)rxPacket->rssi;
        latestRfOffset=ReadRfOffSet();

        /* Signal packet received */
        Event_post(radioOperationEventHandle, RADIO_EVENT_VALID_PACKET_RECEIVED);
    }
}

4)  RF setup

Use 0xd391d391 in CC1310 as the Sync Word to compatible with CC1101

// Parameter summary
// Address: off
// Address0: 0xAA
// Address1: 0xBB
// Frequency: 915.00000 MHz
// Data Format: Serial mode disable
// Deviation: 25.000 kHz
// Packet Length Config: Variable
// Max Packet Length: 128
// Packet Length: 20
// RX Filter BW: 98 kHz
// Symbol Rate: 50.00000 kBaud
// Sync Word Length: 32 Bits 
// TX Power: 14 dBm (requires define CCFG_FORCE_VDDR_HH = 1 in ccfg.c, see CC13xx/CC26xx Technical Reference Manual)
// Whitening: No whitening

HI Sevrre,

I just carried out a test with SmartRF Studio 7 &  CC1310 LauchPad,  the settings for Rx are:

2.5 kbps, SimpleLink Long Range (20 kchip/s, 2-GFSK, conv. FEC r=1/2 K=7, DSSS SF=4, Tx dev.: 5 kHz, Rx BW: 49 kHz)

The Tx is running a modified code of rfEasyLinkTx_CC1310_LAUNCHXL_tirtos_ccs as attached.(by adding 3 lines to rfEasyLinkTxFnx, it increase its tx frequency 1KHz in every tx packages) 

I find that the receiving frequency range is from -17KHz to +29KHz, so I want to do the frequency compensation in production test, my question is apart from set frequency directly (e.g. EasyLink_setFrequency(868000000 + Offset)), any other way to do it? Thanks.

Here is the Rx data from SmartRF Studio 7

Offset is from 0xef(-17) to 0x1d(+29), -17KHz to +29KHz

15:24:33.800 | aa 00 6e ef 93 4d 6d 77 d0 d8 1e 6d be b2 d3 f6 30 7f 2d 3f 98 89 03 fe 21 b4 dd 3e 8a 25 2c  |  -26
15:24:34.020 | aa 00 6f f0 c8 b1 4b 1d 5b 07 36 24 6c 9e 0d 58 ac 5c 46 9d eb 0b b5 b8 7a 7c 3d 55 42 79 54  |  -19
15:24:34.243 | aa 00 70 f1 a1 6c 38 d7 08 d0 f3 8d 55 5b 0f bb f1 e8 1a 8f a9 26 d8 24 4d 03 4b d4 0b d6 63  |  -19
15:24:34.460 | aa 00 71 f2 89 4f 85 22 c4 1f be cf ab 66 c4 8b 7a e0 b0 93 d7 cf 7d ea af a8 40 e2 cf 7d 25  |  -19
15:24:34.693 | aa 00 72 f3 42 2d 2d 1b 6d 4d a9 01 eb d5 76 29 29 8b f6 ef c1 30 d1 04 97 6b 70 42 b6 79 36  |  -19
15:24:34.910 | aa 00 73 f4 e8 92 7c 53 17 1a 53 3a 66 8d f9 47 0f 27 17 3f fb 56 c0 91 23 e0 2a 66 a9 d4 2a  |  -19
15:24:35.142 | aa 00 74 f5 b5 32 71 64 10 5a 89 65 83 35 8d f6 ed 25 ab ce 27 ad 5b 68 98 e0 5c 4a 97 8b 73  |  -19
15:24:35.357 | aa 00 75 f6 84 21 e3 45 a4 6b ab d7 c0 ec 82 7a 7d 15 93 a7 7a 2d f8 6d 2c fe f8 fc 78 40 01  |  -19
15:24:35.587 | aa 00 76 f7 15 c7 64 5f a0 6c d2 a1 7c bb 9a e2 70 61 a0 68 fe 53 1d a5 84 bf 18 fc 15 b4 a8  |  -19
15:24:35.800 | aa 00 77 f8 15 90 e6 5d 96 2d b4 a5 75 ca 31 59 34 bb f8 dc 96 d0 1b 09 fd 87 e2 48 83 f1 43  |  -19
15:24:36.330 | aa 00 79 fa f0 dc b2 4b 74 a9 1c ac 5f 5a 55 ea 7f d5 56 7c 2d 26 1b 3e 26 2a dc fd 2a 00 08  |  -19
15:24:36.557 | aa 00 7a fb 57 2f 01 df 42 97 9a ba da 19 52 5c fd 06 4d b9 d7 48 16 bd ff 53 17 1b 50 c9 d4  |  -19
15:24:36.784 | aa 00 7b fc 87 f0 ea 8a a1 d4 cb 82 f2 3b 36 7a 05 4d 79 30 37 00 66 af 12 45 17 58 6a f4 61  |  -19
15:24:36.997 | aa 00 7c fd 3a 78 19 fb 3c 3a 09 63 4a ce b0 2a 77 e0 bd 62 ec dd 4a 80 84 61 d9 a2 27 63 0f  |  -19
15:24:37.222 | aa 00 7d fe e7 22 32 e1 dc ce 64 c9 c0 f7 9d 27 49 b6 6a 2f 4a 9e 67 4b 88 60 7d a2 5d 40 dc  |  -19
15:24:37.446 | aa 00 7e ff 0f 3b b7 f9 ee f5 c2 7a 2f 64 6d 96 8b 3f dd ad 97 24 af ea e2 8c 6c 0b d0 6f ca  |  -19
15:24:37.666 | aa 00 7f 00 39 b6 a8 e5 c1 65 c7 af f5 85 4a 58 2a d2 ec ba 16 29 03 ce 2b b0 38 b2 b7 c3 03  |  -19
15:24:37.890 | aa 00 80 01 bd a2 e9 c1 91 db 75 e3 35 78 f8 1e 76 e9 00 51 c6 b0 99 8e d8 ce 46 60 fe f1 bd  |  -19
15:24:38.110 | aa 00 81 02 42 5a 66 74 46 90 92 6d dc c6 7b 40 64 0d 00 9f e9 3a 1d 3f fa 95 2c 68 4a 46 dd  |  -19
15:24:38.341 | aa 00 82 03 07 80 f6 c9 fa 6a cb cd 63 d2 7d 4c 92 91 f2 d2 45 bc 98 88 c5 8f d9 f9 bf 1a 5c  |  -19
15:24:38.861 | aa 00 84 05 0c d6 e3 93 1c 0e eb 35 9c e7 64 35 d3 55 7f 00 3b b1 f8 04 21 21 13 fb ff c6 58  |  -19
15:24:39.087 | aa 00 85 06 99 a9 0d 32 da 63 78 93 6c 8e d1 00 19 ee 09 66 e4 5f 3e 89 e6 7e f9 8c ea 17 2d  |  -19
15:24:39.311 | aa 00 86 07 c8 52 f0 2d 82 9c f6 61 20 57 d2 fb 4b 40 ed 75 ac a4 42 b5 02 42 df d3 05 ff 1b  |  -19
15:24:39.529 | aa 00 87 08 fe 4c 98 1b 23 58 f7 2b b4 f5 5e bc d6 4a ab 21 32 3e 75 6d 4d 9f c7 79 a5 16 9b  |  -19
15:24:39.758 | aa 00 88 09 91 cb 18 b0 d6 d8 8b 65 08 6f 27 4b a7 ca 7d 1b f5 d6 b9 5f 98 9e a2 bf f4 78 4f  |  -19
15:24:39.981 | aa 00 89 0a 46 f2 aa 07 81 7c a6 fa e9 d2 40 f5 70 2f 37 e4 d3 33 8a 56 74 91 b6 0c f6 78 ac  |  -19
15:24:40.197 | aa 00 8a 0b 9b c7 94 c1 5d f0 44 a1 cd a7 7f df af 53 ed a3 53 32 de 4e b1 4a bf 45 4c 13 58  |  -19
15:24:40.421 | aa 00 8b 0c c3 e6 cb d1 37 23 4d f5 61 25 a1 5c 6e e7 59 b8 a1 73 cc 47 a7 0e d6 e1 b9 25 52  |  -19
15:24:40.647 | aa 00 8c 0d 74 f6 58 13 78 fe 37 41 c2 25 31 fe ca ac f9 0f 5c d2 ed dc 37 49 13 ba 67 5c d5  |  -19
15:24:40.871 | aa 00 8d 0e 62 dd 7d a0 e5 d0 6f 1e 8c d8 28 6c 34 65 fa 34 10 9b 84 91 8e 01 f3 a3 e7 ee fc  |  -19
15:24:41.397 | aa 00 8f 10 2c 7a bd 69 04 ad cc 02 78 42 76 ed 7f cb bd f8 b2 36 79 50 aa fe 16 87 16 13 13  |  -19
15:24:41.677 | aa 00 90 11 9e 8a 36 7b 7b 04 8f 56 d3 e0 33 aa d6 20 b6 09 99 1c 65 78 b5 e9 48 b9 9f 87 db  |  -19
15:24:41.841 | aa 00 91 12 c5 cc 86 6b 6e 14 e2 3b 4e a6 aa 72 ec e5 83 33 b4 3b 6c e9 db c5 03 cf f7 be 7d  |  -19
15:24:42.061 | aa 00 92 13 5a ad 63 af 32 4e 0d 9f 61 42 e0 ff 1d 75 47 93 47 53 72 f5 8c aa d1 66 3e 5d 4f  |  -19
15:24:42.289 | aa 00 93 14 f0 ce 4f b1 d3 09 67 ef d3 b1 df da 71 ab e7 1e 5f 8c 9c 93 dd c3 b9 49 d6 86 1d  |  -19
15:24:42.511 | aa 00 94 15 b9 7d 01 63 19 31 f5 f1 03 33 9f 6d 23 0c 33 f6 96 e8 b1 f0 8c 01 e2 48 a5 cd 10  |  -19
15:24:42.733 | aa 00 95 16 09 e6 88 94 45 bd d0 50 e9 ff a9 d3 e2 c3 c3 7f 98 78 42 cb c6 91 f5 ce 1d ed 51  |  -19
15:24:42.957 | aa 00 96 17 98 08 2f 04 9d e4 4a f5 d9 b5 76 74 d8 4f a1 2f 67 50 8b 7e aa 0d 45 2f fc 3d 6b  |  -19
15:24:43.184 | aa 00 97 18 89 67 20 36 ad 0d ce 1b 0b 96 9b 53 6e fc aa 27 5f 3a 16 dd 8a 73 af c3 d1 e2 72  |  -20
15:24:43.397 | aa 00 98 19 2d 85 ca 0a 49 89 89 1f dd 74 a5 23 cb 14 b2 84 fa 2b 23 c1 f6 d7 41 b6 44 c3 e7  |  -19
15:24:43.932 | aa 00 9a 1b 8c da eb 7c 41 af 2e 2d 66 48 27 93 a3 1f 06 0a 6b c6 da 67 1e d8 17 c4 de a0 c8  |  -27
15:24:44.153 | aa 00 9b 1c 31 8b 94 45 5b 4e 72 a0 79 d6 2c 42 5d f4 95 d0 2d c5 89 bd ba e2 a9 53 a1 4d d3  |  -28
15:24:44.372 | aa 00 9c 1d 24 16 64 6c c6 d0 2d ac a8 b7 36 6a a6 9e 35 20 31 9a cc 29 ea 71 86 0e 04 c0 90  |  -28

RF_Scan_868_BW49KHz.zip

Thanks Siri, by the way, could please get me some helps on how to read the value of DEMMAFC?

Hi

The problem is your ReadRfOffSet function:

int8_t ReadRfOffSet(void)
{
    int8_t RfOffSet;
    RfOffSet = (int8_t)RF_runImmediateCmd(rfHandle, (uint32_t*)&RF_cmdReadRfRegRfOffSet);
    return RfOffSet;
}

When you return RfOffSet you retun RF_Stat. what you want to retun is cmdReadRfRegRfOffSet.value

BR

Siri

Thanks Siri for your reply, Could please show me how to do it in detail?

Hi Siri,

Thanks again for the reply,  Could you please show me how to get the value of it?

Best regards,

Jack

Thanks Siri,

Yes, it's what I need.  just one more question: is it possible to read the LQI?

BR

Jack

Hi Siri,

Thanks for your help, now I can read the DEMMAFC0 value.

However, when I do the calculation, the result doesn't match the real frequency offset. for example, when the frequency=+22KHz, the DEMMAFC0 value=34, according to Sverre's formulation (see post above) , the frequency offset=34/64*5000=2656.25Hz

Could you please tell me what is wrong?

BR,

Jack

Hi Siri,

Thanks a lot for your reply. it seems that something is wrong with RF offset reading.

I do the test again and capture the Rx data as below.The datat show that the Rx frequency ragne is -26KHz to +21KHz,  the Rx BW=26KHz+21KHz=47KHz which meet RF settings (-24.5KHz to +24.5KHz in theory ). but the RF offset bytes are jumping, and value doesn't make sense.

The attached Tx code run on CC1310 LaunchPad to send RF packages to the air, it increases the RF frequency 1 KHz every package. The Rx code run on CC1310 LaunchPad to receive the RF packages and read the RSSI and RF offset and send to uart port.

Could you please help me to find out what is wrong?

Thank you,

Jack

FrqScan_868MHz_LRM2K5_TX.zip

FrqScan_868MHz_LRM2K5_RX_TO_UART.zip

// Parameter summary
// Address: off
// Address0: 0xAA
// Address1: 0xBB
// Frequency: 868.00000 MHz
// Data Format: Serial mode disable
// Deviation: 5.000 kHz
// Packet Length Config: Variable
// Max Packet Length: 128
// Packet Length: 20
// RX Filter BW: 49 kHz
// Symbol Rate: 19.99969 kBaud
// Sync Word Length: 32 Bits
// TX Power: 14 dBm (requires define CCFG_FORCE_VDDR_HH = 1 in ccfg.c, see CC13xx/CC26xx Technical Reference Manual)
// Whitening: No whitening

The 3th byte is the real frequency setting 0xE6= -26 (Frq= -26KHz); the second last byte is RSSI, and the last byte is DEMMAFC0=0xFE

[R x] DC 65 E6 1F E2 79 39 8B 4A 82 A3 4D A0 EA 93 E4 01 17 0D 8E 1F 20 6E 1A F2 08 F0 8B 1C B8 D4 FE
[R x] DC 66 E7 71 1D BE 33 07 3B C8 3B 0D 2E DE 4A 64 8F 63 73 6B FF C9 B3 1C 17 17 BA E5 13 1C D6 FE
[R x] DC 67 E8 47 3D 71 72 30 1B 30 B8 19 58 75 C8 DF 73 99 0F 62 29 29 35 E0 A3 A8 2E 0F 60 09 D7 FE
[R x] DC 68 E9 FC E0 EB 51 A6 16 92 B7 59 8B A9 BF CC 52 BA BA FA AF 69 4B C0 86 74 B2 3B 85 6A DD DA
[R x] DC 69 EA DF 11 2E 14 58 F1 2B CA 21 BD 54 A1 E5 04 E3 9E 98 40 CD E8 55 7B 07 57 F6 BD 7B DE E4
[R x] DC 6A EB 75 3C C9 03 06 43 BE D1 F0 DE 95 3E 2F 4A F0 0A CB 20 94 AF F6 3B E7 2A E8 6E 2B DE F0
[R x] DC 6B EC 7B E7 78 3A 86 61 7B 0D F9 0D F1 0E BD 3E E1 05 49 D7 9C C9 04 75 75 49 5D 5B 41 DE FA
[R x] DC 6C ED AC 21 8D 3C C7 1C A2 F5 64 8C 39 4D 32 88 FE A4 B6 AA C7 78 E6 7A 91 B7 87 9B 3F DE F6
[R x] DC 6E EF 4C 2C A8 79 28 69 90 DA A5 26 EB 7D 96 06 5C 91 6D 53 BA CC 54 F1 8B 37 0D 05 41 DE F0
[R x] DC 6F F0 8A 64 36 7C 4C BE 69 BE 7C 87 F6 DC CA A9 57 BD 09 EB 5D 23 87 1F EC BB 2E 0E 79 DD 04
[R x] DC 70 F1 5C 24 45 43 82 DB 56 03 7E E9 3A ED B9 29 7B 2C 00 4A E1 DC 23 3A 6A 57 50 50 0A DE F4
[R x] DC 71 F2 2D 3C 23 4B B7 AF C2 D2 DD C9 9F 19 DB 47 D3 5D 57 69 57 9F 3E A4 40 32 5D 0C BD DE FE
[R x] DC 72 F3 BF 7F CC B1 C9 93 BF 41 16 3D 72 C5 13 46 49 95 5A 6E EC 66 CF 5D C2 0E 7D 4D 2E DD 08
[R x] DC 73 F4 2E 79 8C 05 CC 44 EA 67 7A 2A 86 A0 72 67 0C 73 9D 69 8C 50 F4 F6 3D 60 99 1D F4 DD 02
[R x] DC 74 F5 B4 DE 62 E3 0E 99 10 30 70 37 1C BB B9 1A B1 3F C2 C5 47 34 F2 4B A0 20 A0 79 7D DD F2
[R x] DC 75 F6 2B C3 24 42 DB EF 93 EF 76 83 81 5C A2 EF 19 04 FE 7B 76 F6 FE EF DD 60 8A 04 BC DD F6
[R x] DC 76 F7 56 8D 66 88 00 65 8C B6 EB 17 7B 92 DE 50 17 63 5B 05 9B 9B C0 64 0E 9D 20 7C 84 DD 00
[R x] DC 77 F8 DE AB 1A 64 0F CB AF 66 8D 1B 63 86 DB EF D0 23 BC 18 0B 1C 92 11 59 D6 77 EE B1 DD FC
[R x] DC 79 FA 9C 31 97 1C EF 21 E9 D7 99 26 78 20 68 24 40 6D B5 27 3D 9B 3D 0E A5 75 C0 F7 E8 DD F8
[R x] DC 7A FB 5B 69 68 9D A6 44 F8 A3 8D 69 16 20 EF 29 E8 08 F8 6F F9 47 3F AC B0 90 9F 85 94 DD F4
[R x] DC 7B FC D5 3F 41 E4 DE E6 29 D8 0E 40 0C 7B F0 75 35 8C E1 7B 7A 15 6B 43 F1 79 62 A5 72 DD FE
[R x] DC 7C FD C1 0C D1 A3 42 E1 D8 D6 BF B9 07 18 4B 3D 0B 7B 0F DD FE 73 E6 34 64 21 B8 39 E1 DD F0
[R x] DC 7D FE 97 2B BC 86 9B 3B 14 09 7E F6 E4 B2 F6 79 B8 B5 D6 53 2C 7B E3 38 29 2E 77 6B DF DD FA
[R x] DC 7E FF D8 E9 82 4A 55 56 C4 37 26 A9 15 6E 01 96 9D 50 7C BE F5 08 26 99 A9 54 63 1F 6E DD F6
[R x] DC 7F 00 0B 39 24 93 C2 EB 8A 98 15 3E C3 2C 59 EE 8C 2A 44 D8 3A 88 48 22 76 67 B3 28 B9 DD 02
[R x] DC 80 01 88 2A 85 7C 1B B6 69 AA 6E D6 B2 A0 4E FA F1 3E 2D A4 31 95 BE D6 F5 33 53 3B F4 DD 0C
[R x] DC 81 02 F6 17 93 ED 49 F0 26 C0 1E FA E7 1E D5 43 B2 B8 79 A3 86 44 99 61 BC 08 E8 A5 05 DD 08
[R x] DC 82 03 94 A2 25 AF 66 80 71 5E 9E 0A 09 37 8C 1C D6 C9 EE CA 42 3A 0D 51 BA 16 96 BE E5 DD FA
[R x] DC 84 05 1B 53 63 63 2A 1D 02 4F 99 B9 83 4A AF 1A 15 C1 E6 99 75 1F 8B 5C E6 21 18 84 F2 DD 0E
[R x] DC 85 06 51 1A DF 7F 21 B7 F0 FB 32 F5 61 33 4E 99 20 14 78 7D 4B 62 C9 3E 6D 40 0C AB 78 DD 0A
[R x] DC 86 07 19 E8 82 A6 F2 65 40 C5 9F 83 43 FA C9 00 F4 C0 18 26 50 FB 4E B8 64 C4 20 97 88 DD FA
[R x] DC 87 08 D8 37 5B 72 AC C6 82 3D DB 16 1F 38 8D 4E 13 B9 68 55 F4 D0 F2 FA CD 57 A9 E3 98 DD 08
[R x] DC 88 09 E4 3C 7C 93 68 1B C7 D4 C9 B5 AA F5 87 43 B6 AF E4 B2 1A 8E 86 0D 99 39 D1 AB 4E DD F6
[R x] DC 89 0A 02 18 20 28 0C C4 03 76 33 6D F3 7C 69 4E B1 25 6B 05 3C 02 9B 45 0E D3 9C 40 1C DD 00
[R x] DC 8A 0B B0 D1 8A CF D1 6D 32 DA 90 C8 D3 F3 B1 46 19 42 84 28 51 27 01 73 E8 0A AB 9F A8 DD 0A
[R x] DC 8B 0C 21 05 B3 7C 84 06 3B 9A 8C FA 07 AD 69 DF A5 64 5B BE 6F FE 10 DC 40 53 C1 A6 F4 DD FA
[R x] DC 8C 0D 0B 5A A1 0B 8E 75 96 04 47 E0 18 3B AE D9 D7 77 8F A2 32 20 A8 EC 2F 89 08 02 38 DD 10
[R x] DC 8D 0E 22 B6 96 95 B4 0C AF AD 5A A8 FF 47 F1 F7 D8 09 AC 20 D9 12 F8 A9 30 7F 11 E9 8F DD 00
[R x] DC 8F 10 0E CD C9 68 15 03 1F 3C A8 CC 80 11 BE B7 ED B8 F0 B5 40 5A D7 40 E5 8D 22 48 58 DD 16
[R x] DC 90 11 79 E2 62 86 15 B0 13 6D 1C 0E 7E 7B BD 01 37 46 10 E0 8D D0 AB C0 88 DB 04 A1 A1 DD 10
[R x] DC 91 12 89 5A 44 34 81 44 06 DF A0 A9 A6 A0 6D EB C5 9D 54 74 65 3E 8A 61 23 BF A5 ED 34 DD 1C
[R x] DC 92 13 F7 9F 21 E5 AE 33 42 7F AC 4A FC 3B 27 D1 BA DA 00 31 AC F7 E4 3B 42 D3 25 D1 67 DD 28
[R x] DC 93 14 56 55 7E 04 A8 D3 1D BD 07 EE 8C D3 F4 8B FC F2 21 3F 87 F1 CE 79 EB E3 E6 6F 06 D6 02
[R x] DC 94 15 D8 CA 11 83 37 10 9C 5C 10 D5 4D D2 0F A1 58 07 50 A0 BE 5C 06 0C 45 BF CE 5B 3A D4 04

The 3th byte is the real frequency setting 0x15= +21 (Frq= +21KHz); the last byte is DEMMAFC0=0x04

Hi Siri,

Thank you for your help. I run the test again with 50 kbps, 2-GFSK, 25 kHz deviation, all good.

So I will do test with GFSK mode to get freuency offset in production, and use LRM in operation. Now the question is how to change the RF settings in run mode without change the parameters in smartrf_settings.c and re-flash the chip again?'

Best regards,

Jack

Hi Jack

You will need to do an RF_open with the genfsk settings and then before changing config. you do an RF_close. You then do another RF_open with the new settings:

rfHandle = RF_open(&rfObject, &RF_prop, (RF_RadioSetup*)&RF_cmdPropRadioDivSetup_genfsk, &rfParams);
.
.
.
RF_close(rfHandle);

rfHandle = RF_open(&rfObject, &RF_prop, (RF_RadioSetup*)&RF_cmdPropRadioDivSetup_SLR, &rfParams);

Siri