On 02/02/21 10:04, Chenyi Qiang wrote:
#define DR6_FIXED_1 0xfffe0ff0 -#define DR6_INIT 0xffff0ff0 +/* + * DR6_ACTIVE_LOW is actual the result of DR6_FIXED_1 | ACTIVE_LOW_BITS. + * We can regard all the current FIXED_1 bits as active_low bits even + * though in no case they will be turned into 0. But if they are defined + * in the future, it will require no code change. + * At the same time, it can be served as the init/reset value for DR6. + */ +#define DR6_ACTIVE_LOW 0xffff0ff0 #define DR6_VOLATILE 0x0001e00f
Committed with some changes in the wording of the comment. Also, DR6_FIXED_1 is (DR6_ACTIVE_LOW & ~DR6_VOLATILE). Paolo
