CC1310's preamble

feng gu

Prodigy 180 points

Other Parts Discussed in Thread: CC1125, CC1310

i want to know ,CC1310's preamble can changle to 0xcc or 0x33 ,like cc1125.

i found the register ,the preamble can only user 0x55 and 0xaa

over 8 years ago

0 TER over 8 years ago

TI__Guru**** 317180 points

for 0x33 preamble you can add this to the override list:

(uint32_t) 0x33330043

For 0xCC preamble you can add this to the override list:

(uint32_t) 0xCCCC0043

0 feng gu over 8 years ago in reply to TER

Prodigy 180 points

like this

0 TER over 8 years ago in reply to feng gu

TI__Guru**** 317180 points

Note quite. The (uint32_t)0xFFFFFFFF is a end of overrides marker so you have to add new overrides before this.

0 will wang43 over 8 years ago in reply to TER

Expert 1205 points

tx side setting like this:

    ADI_HALFREG_OVERRIDE(0,61,0xF,0xD),
    // override_phy_agc_reflevel_0x1a.xml
    HW_REG_OVERRIDE(0x6088,0x001A),
    // TX power override
    ADI_REG_OVERRIDE(0,12,0xF8),
    (uint32_t)0x33330043,
    (uint32_t)0xFFFFFFFF,

and RX side don't modify anything. But they also can communicate with each other.

0 will wang43 over 8 years ago in reply to TER

Expert 1205 points

If add (uint32_t)0x33330043 before (uint32_t)0xFFFFFFFF means setting Preamble to 0x3333 on tx side, and RX side remain original setting(0xaaaa or 0x5555 preamble).then i guess they cannot be communicate successfully because of different preamble, but in fact they also can communicate with each other. So, I wonder if setting like this is correct or not?
Looking forward for your reply,tks.

0 TER over 8 years ago in reply to will wang43

TI__Guru**** 317180 points

Note that the radio does not check the type of preamble. Both CC1125 and CC1310 uses the preamble to settle the AGC. In other words the radios just needs a few 1<->0 transitions before the sync word. The transitions doesn't need to follow a specific pattern.

The exception is if you use PQT.

0 will wang43 over 8 years ago in reply to TER

Expert 1205 points

hi TER:
Got it,thanks a lot!

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CC1310's preamble