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[tattlekey] / client / tattlekey.c
1 #include "pico/cyw43_arch.h"
2 #include "pico/stdlib.h"
3 #include "pico/util/pheap.h"
4 #include "pico/util/queue.h"
5
6 #include "blink.h"
7 #include "button.h"
8 #include "config.h"
9 #include "net.h"
10 #include "press.h"
11
12 enum event_type { NEW_BUTTON_PRESS, RESEND_TIME };
13 typedef struct {
14 enum event_type type;
15 union {
16 struct {
17 uint32_t timestamp;
18 } buttonpress;
19 };
20 } event_t;
21
22 queue_t queue;
23
24 uint32_t time_s() { return time_us_64() / 1000000ul; }
25
26 /* Often we don't bother checking for failure (full queue) because
27 * 1. The best thing to do in this unfortunate situation is to blithely
28 * continue, dropping some events; continuing is better than stopping.
29 * 2. Neither interrupt context nor queue-processing context can block
30 * until space is available, or even sit around & blink the LED to
31 * signal a problem.
32 * (We also get a bit of type safety by taking event_t* rather than void*.) */
33 static void queue_try_add_ignoring_errors(queue_t *q, event_t *e) {
34 queue_try_add(q, e);
35 }
36
37 static void button_pressed() {
38 /* This runs in interrupt context; don't linger. */
39 static uint64_t last_button_press_time = 0;
40 uint32_t now = time_s();
41 uint32_t time_since_last_press = now - last_button_press_time;
42 if (time_since_last_press >= config_minimum_seconds_between_button_presses) {
43 last_button_press_time = now;
44 event_t e;
45 e.type = NEW_BUTTON_PRESS;
46 e.buttonpress.timestamp = now;
47 queue_try_add_ignoring_errors(&queue, &e);
48 }
49 }
50
51 static void time_to_send(uint _) {
52 /* This runs in interrupt context; don't linger. */
53 event_t e;
54 e.type = RESEND_TIME;
55 queue_try_add_ignoring_errors(&queue, &e);
56 }
57
58 void set_resend_alarm(int alarm, uint32_t now, uint32_t next_act_time) {
59 uint32_t sleep_duration = next_act_time - now;
60 if (hardware_alarm_set_target(alarm,
61 make_timeout_time_ms(sleep_duration * 1000)))
62 signal_error_by_blinking();
63 }
64
65 void service_sleeps(int alarm, press_pile_t *pp) {
66 hardware_alarm_cancel(alarm);
67
68 while (1) {
69 uint32_t now = time_s();
70 int32_t act_time = next_scheduled_send(pp);
71 if (act_time == -1)
72 return;
73 if (act_time > now) {
74 set_resend_alarm(alarm, now, act_time);
75 return;
76 }
77 press_t press;
78 if (!get_press_due_for_resend(pp, now, &press))
79 signal_error_by_blinking();
80 uint32_t ago = now - press.timestamp;
81 send_report_packet(press.seq, ago);
82 press.send_count++;
83 if (press.send_count < config_resend_count) {
84 add_press(pp, &press);
85 }
86 }
87 }
88
89 void service_queue() {
90 int alarm = hardware_alarm_claim_unused(true);
91 if (alarm == -1)
92 signal_error_by_blinking();
93 hardware_alarm_set_callback(alarm, time_to_send);
94
95 press_pile_t *pp = create_press_pile();
96 u16_t seq = 0;
97 while (1) {
98 service_sleeps(alarm, pp);
99
100 event_t e;
101 queue_remove_blocking(&queue, &e);
102 switch (e.type) {
103 case NEW_BUTTON_PRESS: {
104 add_press(pp, &(press_t){e.buttonpress.timestamp, seq++, 0});
105 } break;
106 case RESEND_TIME: {
107 /* OK, we're awake. Cool. Thanks! (We actually do the sends in the
108 * service_sleeps() call at the top of the loop.) */
109 } break;
110 default:
111 signal_error_by_blinking();
112 }
113 }
114 }
115
116 int main() {
117 stdio_init_all();
118 if (cyw43_arch_init_with_country(CYW43_COUNTRY_USA))
119 signal_error_by_blinking();
120 cyw43_arch_enable_sta_mode();
121 signal(3, 100);
122 if (cyw43_arch_wifi_connect_timeout_ms(config_wifi_ssid, config_wifi_pass,
123 CYW43_AUTH_WPA2_AES_PSK, 90000))
124 signal_error_by_blinking();
125 signal(2, 300);
126
127 queue_init(&queue, sizeof(event_t), 99);
128
129 begin_listening_for_button_press(button_pressed);
130
131 service_queue();
132 }