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CC1125 long packet receive

hi, Ti experts.

the receive session has problem is RX_FIFO_OVERFLOW.

transmission is good following the data sheet SWRU295E.

reception is always occurred OVERFLOW error.

i cannot read the FIFO buffer because RXFIFO_LAST Pointer  alway 0, also FIRST. and then i met error status.

settling is

IFCFG2=0x06;

SYNC_CFG1=0x07;

SYNC_CFG0=0x17;

FIFO_CFG=0x7F,

PKT_CFG2=0x04;

PKT_CFG1=0x45;

PKT_CFG0=0x40;

PKT_LEN=0xFF;

how to receive the long packet has 1024 data Bytes .