Revision 91
binary shenanigans to reduce code
| lab4/mouse.c | ||
|---|---|---|
| 39 | 39 |
|
| 40 | 40 |
/// This does not run if: I was expecting the first one but what I get is definitely not the first byte |
| 41 | 41 |
if((byte & FIRST_BYTE_ID) || counter_mouse_ih){
|
| 42 |
packet_mouse_ih[counter_mouse_ih] = byte; |
|
| 43 |
counter_mouse_ih++; |
|
| 42 |
packet_mouse_ih[counter_mouse_ih++] = byte; |
|
| 44 | 43 |
} |
| 45 | 44 |
} |
| 46 | 45 |
|
| lab4/state_machine.c | ||
|---|---|---|
| 7 | 7 |
#include "utils.h" |
| 8 | 8 |
|
| 9 | 9 |
struct mouse_ev* mouse_get_event(struct packet *pp) {
|
| 10 |
|
|
| 11 | 10 |
static struct mouse_ev event; |
| 12 |
static struct packet last; // compare consecutive events |
|
| 13 |
static int aux = 1; // first iteration |
|
| 11 |
static uint8_t last = 0; |
|
| 14 | 12 |
|
| 15 | 13 |
if (pp == NULL) |
| 16 | 14 |
return &event; |
| 17 | 15 |
|
| 18 |
// current packet |
|
| 19 |
uint8_t lb_press = pp->bytes[0] & LEFT_BUTTON; |
|
| 20 |
uint8_t rb_press = pp->bytes[0] & RIGHT_BUTTON; |
|
| 21 |
uint8_t mb_press = pp->bytes[0] & MIDDLE_BUTTON; |
|
| 16 |
// current button presses |
|
| 17 |
uint8_t button_presses = pp->bytes[0] & (LEFT_BUTTON | RIGHT_BUTTON | MIDDLE_BUTTON); |
|
| 22 | 18 |
int16_t delta_x = pp->delta_x; |
| 23 | 19 |
int16_t delta_y = pp->delta_y; |
| 24 | 20 |
|
| 25 |
if (aux) { // first event detected
|
|
| 26 |
if (lb_press && (rb_press | mb_press) == 0 && delta_x == 0 && delta_y == 0) |
|
| 27 |
event.type = LB_PRESSED; |
|
| 28 |
else if (rb_press && (lb_press | mb_press) == 0 && delta_x == 0 && delta_y == 0) |
|
| 29 |
event.type = RB_PRESSED; |
|
| 30 |
else if ((delta_x || delta_y) && (lb_press | rb_press | mb_press) == 0) {
|
|
| 31 |
event.type = MOUSE_MOV; |
|
| 32 |
event.delta_x = delta_x; |
|
| 33 |
event.delta_y = delta_y; |
|
| 34 |
} else |
|
| 35 |
event.type = BUTTON_EV; |
|
| 36 |
aux = 0; |
|
| 37 |
} else {
|
|
| 38 |
// last packet |
|
| 39 |
uint8_t last_lb_press = last.bytes[0] & LEFT_BUTTON; |
|
| 40 |
uint8_t last_rb_press = last.bytes[0] & RIGHT_BUTTON; |
|
| 41 |
uint8_t last_mb_press = last.bytes[0] & MIDDLE_BUTTON; |
|
| 21 |
if ((button_presses ^ last) == LEFT_BUTTON && !(last & LEFT_BUTTON)) {
|
|
| 22 |
event.type = LB_PRESSED; |
|
| 23 |
last |= LEFT_BUTTON; |
|
| 42 | 24 |
|
| 43 |
if (lb_press && (rb_press | mb_press) == 0 && delta_x == 0 && delta_y == 0 && last_lb_press == 0) |
|
| 44 |
event.type = LB_PRESSED; |
|
| 45 |
else if (rb_press && (lb_press | mb_press) == 0 && delta_x == 0 && delta_y == 0 && last_rb_press == 0) |
|
| 46 |
event.type = RB_PRESSED; |
|
| 47 |
else if ((lb_press | rb_press | mb_press) == 0 && delta_x == 0 && delta_y == 0 && last_lb_press) |
|
| 48 |
event.type = LB_RELEASED; |
|
| 49 |
else if ((lb_press | rb_press | mb_press) == 0 && delta_x == 0 && delta_y == 0 && last_rb_press) |
|
| 50 |
event.type = RB_RELEASED; |
|
| 51 |
else if ((delta_x || delta_y) && (lb_press | rb_press | mb_press) == (last_lb_press | last_rb_press | last_mb_press)) {
|
|
| 52 |
event.type = MOUSE_MOV; |
|
| 53 |
event.delta_x = delta_x; |
|
| 54 |
event.delta_y = delta_y; |
|
| 55 |
} else |
|
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event.type = BUTTON_EV; |
|
| 57 |
} |
|
| 25 |
} else if ((button_presses ^ last) == RIGHT_BUTTON && !(last & RIGHT_BUTTON)) {
|
|
| 26 |
event.type = RB_PRESSED; |
|
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last |= RIGHT_BUTTON; |
|
| 58 | 28 |
|
| 59 |
// update last packet for comparison |
|
| 60 |
last = *pp; |
|
| 29 |
} else if ((button_presses ^ last) == LEFT_BUTTON && (last & LEFT_BUTTON)) {
|
|
| 30 |
event.type = LB_RELEASED; |
|
| 31 |
last &= ~LEFT_BUTTON; |
|
| 61 | 32 |
|
| 33 |
} else if ((button_presses ^ last) == RIGHT_BUTTON && (last & RIGHT_BUTTON)) {
|
|
| 34 |
event.type = RB_RELEASED; |
|
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last &= ~RIGHT_BUTTON; |
|
| 36 |
|
|
| 37 |
} else if ((delta_x || delta_y) && (button_presses == last)) {
|
|
| 38 |
event.type = MOUSE_MOV; |
|
| 39 |
|
|
| 40 |
} else |
|
| 41 |
event.type = BUTTON_EV; |
|
| 42 |
|
|
| 43 |
event.delta_x = delta_x; |
|
| 44 |
event.delta_y = delta_y; |
|
| 62 | 45 |
return &event; |
| 63 | 46 |
} |
| 64 | 47 |
|
| ... | ... | |
| 89 | 72 |
x_length += event->delta_x; |
| 90 | 73 |
y_length += event->delta_y; |
| 91 | 74 |
} else if (event->type == LB_RELEASED) {
|
| 92 |
if (x_length == 0 || y_length == 0) {
|
|
| 75 |
if (y_length < x_length || x_length < x_len) {
|
|
| 93 | 76 |
state = INITIAL; |
| 94 |
break; |
|
| 95 |
} |
|
| 96 |
|
|
| 97 |
int slope = y_length / x_length; |
|
| 98 |
|
|
| 99 |
if (slope <= 1 || x_length < x_len) {
|
|
| 100 |
state = INITIAL; |
|
| 101 | 77 |
x_length = 0; |
| 102 | 78 |
y_length = 0; |
| 103 | 79 |
break; |
| ... | ... | |
| 139 | 115 |
state = INITIAL; |
| 140 | 116 |
break; |
| 141 | 117 |
} |
| 142 |
int slope = y_length / x_length; |
|
| 143 | 118 |
|
| 144 |
if (slope >= -1 || x_length < x_len) {
|
|
| 119 |
if (y_length > -x_length || x_length < x_len) {
|
|
| 145 | 120 |
state = INITIAL; |
| 146 | 121 |
x_length = 0; |
| 147 | 122 |
y_length = 0; |
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