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1 #include "pico/cyw43_arch.h"
2 #include "pico/stdlib.h"
3 #include "pico/util/queue.h"
4
5 #include "blink.h"
6 #include "button.h"
7 #include "config.h"
8 #include "net.h"
9
10 enum event_type { BUTTONPRESS };
11 typedef struct {
12 enum event_type type;
13 union {
14 struct {
15 uint32_t timestamp;
16 } buttonpress;
17 };
18 } event_t;
19
20 queue_t queue;
21
22 uint32_t time_s() { return time_us_64() / 1000000ul; }
23
24 /* Often we don't bother checking for failure (full queue) because
25 * 1. The best thing to do in this unfortunate situation is to blithely
26 * continue, dropping some events; continuing is better than stopping.
27 * 2. Neither interrupt context nor queue-processing context can block
28 * until space is available, or even sit around & blink the LED to
29 * signal a problem.
30 * (We also get a bit of type safety by taking event_t* rather than void*.) */
31 static void queue_try_add_ignoring_errors(queue_t *q, event_t *e) {
32 queue_try_add(q, e);
33 }
34
35 static void button_pressed() {
36 /* This runs in interrupt context; don't linger. */
37 static uint64_t last_button_press_time = 0;
38 uint32_t now = time_s();
39 uint32_t time_since_last_press = now - last_button_press_time;
40 if (time_since_last_press >= config_minimum_seconds_between_button_presses) {
41 last_button_press_time = now;
42 event_t e;
43 e.type = BUTTONPRESS;
44 e.buttonpress.timestamp = now;
45 queue_try_add_ignoring_errors(&queue, &e);
46 }
47 }
48
49 int main() {
50 stdio_init_all();
51 if (cyw43_arch_init_with_country(CYW43_COUNTRY_USA))
52 signal_error_by_blinking();
53 cyw43_arch_enable_sta_mode();
54 signal(3, 100);
55 if (cyw43_arch_wifi_connect_timeout_ms(config_wifi_ssid, config_wifi_pass,
56 CYW43_AUTH_WPA2_AES_PSK, 90000))
57 signal_error_by_blinking();
58 signal(2, 300);
59
60 queue_init(&queue, sizeof(event_t), 99);
61
62 begin_listening_for_button_press(button_pressed);
63
64 u16_t seq = 0;
65 while (1) {
66 event_t e;
67 queue_remove_blocking(&queue, &e);
68 switch (e.type) {
69 case BUTTONPRESS:
70 seq++;
71 for (int i = 0; i < config_resend_count; i++) {
72 uint32_t now = time_s();
73 uint32_t ago = now - e.buttonpress.timestamp;
74 send_report(seq, ago);
75 signal(i == 0 ? 2 : 1, 100);
76 sleep_ms(config_resend_interval_ms);
77 }
78 break;
79 default:
80 signal_error_by_blinking();
81 }
82 }
83 }