On Tue, Oct 08, 2019 at 09:32:05AM +0000, Shuming [范書銘] wrote:

> +		if (first_bit == 0 || first_bit == 2 ||
> +			first_bit == 4 || first_bit == 6) {


> +		} else {
> +		}

This would be more idiomatically written as a switch statement, as would
the equivalent stuff on the TX side.