Timestamp difference

Wireless Connectivity Ultra-Wideband
1

Need help.
Code:
uint32_t final_tx_time = (pollack_rx_ts + (RESP_RX_TO_FINAL_TX_DLY_UUS * UUS_TO_DWT_TIME)) >> 8;
dwt_setdelayedtrxtime(final_tx_time);
range_tx_ts = (((uint64_t)(final_tx_time & 0xFFFFFFFEUL)) << 8) + TX_ANT_DLY;

                if (transmit(tx_buffer, size_package*KC_IDX+2, DWT_START_TX_DELAYED) == false)
                {
                    dwt_forcetrxoff();
                    dwt_rxreset();
                }
          uint64_t      ttt = get_tx_timestamp_u64();

Supposed, that (range_tx_ts) - (ttt) = 0, but difference is about 144093184. What’s wrong?

2

Your ttt is “now” after you instructed to transmit(), but actual TX did not yet happen, because your set it to transmit in the future at “range_tx_ts”.

if you transmit returning you an error, that means it cannot transmit, because the delay from the previous R-Marker (pollack_rx_ts ) + RESP_RX_TO_FINAL_TX_DLY is too short, or this time has already passed.

This is the basic principle of how DW IC operates, please check a relevant chapter of the User Manual.