Address
0x08
Description
The OBSERVE_TX register counts the number of packets that a transmitter has retransmitted or dropped.
Contents
This table is copied from the nRF24L01 product specification (page 55).
| Name |
Bit |
Reset Value |
Type | Description |
| PLOS_CNT | 7:4 | 0000 | R | Count lost packets. The counter is overflow protected to 15, and discontinues at max until reset. The counter is reset by writing to RF_CH. |
| ARC_CNT | 3:0 | 0000 | R | Count retransmitted packets. The counter is reset when transmission of a new packet starts. |
Comments
PLOS_CNT can be used along with a running count of transmission attempts to determine the packet loss rate.
The ARC_CNT value is used to determine when a packet is lost. When ARC_CNT equals the value of ARC set in the SETUP_RETR register, the packet being transmitted is considered lost, PLOS_CNT is incremented, and the MAX_RT interrupt fires (not necessarily in that order).