TDOA Delayed Tx 实现以及验证

在博文:https://www.cnblogs.com/tuzhuke/p/11638221.html 中描述了delayed tx实现方法，这里贴出全部delayed tx 代码以及对应验证代码

1 delayed tx 代码

static uint32 final_tx_time;
static uint64 final_tx_ts;
void BPhero_Distance_Sync_Node(void)
{
    int address = 0;
    msg_f_send.destAddr[0] = 0xFF;
    msg_f_send.destAddr[1] = 0xFF;

    final_tx_time = dwt_readsystimestamphi32() +0x100000;
    dwt_setdelayedtrxtime(final_tx_time);

    final_tx_ts = (((uint64)(final_tx_time & 0xFFFFFFFE)) << 8) + TX_ANT_DLY;

    final_msg_set_ts(&msg_f_send.messageData[FIRST_TX],  final_tx_ts);// 2 3 4 5 6

    msg_f_send.seqNum = sync_seqnum;
    msg_f_send.messageData[0]='S';
    msg_f_send.messageData[1]=0;

    dwt_writetxdata(psduLength, (uint8 *)&msg_f_send, 0) ; // write the frame data
    dwt_writetxfctrl(psduLength, 0);
    dwt_starttx(DWT_START_TX_DELAYED);
    while (!(dwt_read32bitreg(SYS_STATUS_ID) & SYS_STATUS_TXFRS))
    { };

     /* Clear TX frame sent event. */
    dwt_write32bitreg(SYS_STATUS_ID, SYS_STATUS_TXFRS);

   // dwt_forcetrxoff();
    if(++sync_seqnum == 256)
        sync_seqnum = 0;
}

2 delayed tx验证方法

            h32_timestamp= final_tx_ts>>8;
            l8_timestamp = final_tx_ts&0xFF;
            sprintf(lcd_display_str, "%X%X",h32_timestamp,l8_timestamp);
            OLED_ShowString(0,4,(uint8_t *)lcd_display_str);

            last_tx_ts = get_tx_timestamp_u64();

            h32_timestamp= last_tx_ts>>8;
            l8_timestamp = last_tx_ts&0xFF;
            sprintf(lcd_display_str, "%X%X",h32_timestamp,l8_timestamp);
            OLED_ShowString(0,6,(uint8_t *)lcd_display_str);

验证方法是把delayed tx timestamp打印出来，同时打印发送tx_timestamp，比较二者是否一致。

上述代码将两个时间放在液晶上显示，观察到两个数据完全一样，说明delayed tx code 没有问题

3其它问题：

64bit 显示有如下问题，中间需要加变量，具体原因没有去深入查资料，有明白的同学可以留言指导

last_rx_ts= 0x123456789A;
sprintf(lcd_display_str, "%X%X",last_rx_ts>>32,last_rx_ts);

液晶上显示120

last_rx_ts= 0x123456789A;
sprintf(lcd_display_str, "%X%X",last_rx_ts，last_rx_ts>>32);

液晶上显示3456789A12

更多内容参考蓝点无限论坛bphero.com.cn

TDOA Delayed Tx 实现以及验证

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