diff options
| -rw-r--r-- | snake.c | 35 |
1 files changed, 21 insertions, 14 deletions
@@ -20,10 +20,11 @@ typedef enum _dir_t { } dir_t; -static volatile uint8_t dir; -static volatile bool start = false; +static volatile uint8_t kbdir; +static volatile bool start; static volatile uint16_t lfsr = 0xace1; +static uint8_t dir; static point_t tail = {7, 4}; #define HISTORY_MAX 128 @@ -88,7 +89,7 @@ static void reset(void) { rand_q(); - dir = EAST; + kbdir = dir = EAST; tail = (point_t){7, 4}; history_len = 0; history_pos = 0; @@ -98,6 +99,10 @@ static void reset(void) { move(EAST, true); } +static void set_led(uint8_t x, uint8_t y, uint8_t val) { + LedSignSet(13-x, 8-y, val); +} + void kbd_handle(uint16_t code, bool make) { if (!make) return; @@ -108,19 +113,19 @@ void kbd_handle(uint16_t code, bool make) { break; case KBD_CODE_UP: - dir = NORTH; + kbdir = NORTH; break; case KBD_CODE_LEFT: - dir = WEST; + kbdir = WEST; break; case KBD_CODE_DOWN: - dir = SOUTH; + kbdir = SOUTH; break; case KBD_CODE_RIGHT: - dir = EAST; + kbdir = EAST; } } @@ -155,24 +160,27 @@ static bool point_used(const point_t *p, bool head) { } static bool step(void) { + if (kbdir != rev(dir)) + dir = kbdir; + uint8_t d = dir; rand_mix(d); - LedSignSet(tail.x, tail.y, 0); + set_led(tail.x, tail.y, 0); int i; point_t pt = tail; - LedSignSet(pt.x, pt.y, 0); + set_led(pt.x, pt.y, 0); for (i = 0; i < history_len; i++) { go(&pt, get_dir(i)); - LedSignSet(pt.x, pt.y, 2); + set_led(pt.x, pt.y, 2); } go(&pt, d); - LedSignSet(pt.x, pt.y, 3); + set_led(pt.x, pt.y, 3); if (point_used(&pt, true)) return false; @@ -189,7 +197,7 @@ static bool step(void) { if (point_used(&pt, false)) return false; - LedSignSet(q.x, q.y, 7); + set_led(q.x, q.y, 7); return true; } @@ -203,9 +211,8 @@ int main() { kbd_send(KBD_CMD_RESET); while(true) { - while (!start) {} start = false; - + while (!start) {} reset(); while (step()) |