查看SX126x的源代码

== Syncword ==

* reset val: 0x14 0x24
* sx126x_set_syncword(dev, 0x12), set syncword = 0x12 0x12
* 中间几次读取，都是 0x12 0x12
* 在 setup_v0(), sx126x_set_lora_modulation_params(d, d->sf, d->bw, d->cr, d->ldro) 执行后，syncword 变为 0x14 0x12！此与官方驱动的 set_sync_word() 实现一致：

<source lang=cpp>
    sx126x_read_reg(dev, SX126X_REG_LR_SYNCWORD, buffer, 2);

    /* reset val: 0x14 0x24 */
    buffer[0] = (buffer[0] & ~0xF0) + (syncword & 0xF0);
    buffer[1] = (buffer[1] & ~0xF0) + ((syncword & 0x0F) << 4);

    sx126x_write_reg(dev, SX126X_REG_LR_SYNCWORD, buffer, 2);
</source>


如 sx127x 作接收最好用 reset val 的 sync_word，注释掉：set_sync_word(0x1212);

* sx127x:  syncword 只一个字节，默认 0x12，LoraWAN 设为 0x34
* 对应 sx126x 的两字节 syncword：默认 0x1424，LoraWAN 设为 0x3444

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