S_IDLE
#define V_IDLE(x) ((x) << S_IDLE)
static k_status status = S_IDLE;
status = S_IDLE;
else if (status == S_IDLE) { /* pen is newly near the tablet */
static k_status status = S_IDLE;
status = S_IDLE;
else if (status == S_IDLE) { /* pen is newly near the tablet */