data_phase
enum data_phase data_phase;
data_phase = none;
data_phase = out;
data_phase = in;
if (data_phase == out) {
if (count && data_phase == in)
uint8_t data_phase; /* Data-In or Data-Out */
uint8_t data_phase; /* Data-In or Data-Out */
uint8_t data_phase; /* Data-In or Data-Out */