git.scottworley.com Git - tattlekey/blob - client/tattlekey.c

   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 typedef struct {
  11   uint32_t timestamp;
  12   u16_t seq;
  13   u8_t send_count;
  14 } send_t;
  15
  16 enum event_type { BUTTONPRESS, SEND };
  17 typedef struct {
  18   enum event_type type;
  19   union {
  20     struct {
  21       uint32_t timestamp;
  22     } buttonpress;
  23     send_t send;
  24   };
  25 } event_t;
  26
  27 queue_t queue;
  28
  29 uint32_t time_s() { return time_us_64() / 1000000ul; }
  30
  31 /* Often we don't bother checking for failure (full queue) because
  32  *   1. The best thing to do in this unfortunate situation is to blithely
  33  *      continue, dropping some events; continuing is better than stopping.
  34  *   2. Neither interrupt context nor queue-processing context can block
  35  *      until space is available, or even sit around & blink the LED to
  36  *      signal a problem.
  37  * (We also get a bit of type safety by taking event_t* rather than void*.) */
  38 static void queue_try_add_ignoring_errors(queue_t *q, event_t *e) {
  39   queue_try_add(q, e);
  40 }
  41
  42 static void button_pressed() {
  43   /* This runs in interrupt context; don't linger.  */
  44   static uint64_t last_button_press_time = 0;
  45   uint32_t now = time_s();
  46   uint32_t time_since_last_press = now - last_button_press_time;
  47   if (time_since_last_press >= config_minimum_seconds_between_button_presses) {
  48     last_button_press_time = now;
  49     event_t e;
  50     e.type = BUTTONPRESS;
  51     e.buttonpress.timestamp = now;
  52     queue_try_add_ignoring_errors(&queue, &e);
  53   }
  54 }
  55
  56 void service_queue() {
  57   u16_t seq = 0;
  58   while (1) {
  59     event_t e;
  60     queue_remove_blocking(&queue, &e);
  61     switch (e.type) {
  62     case BUTTONPRESS: {
  63       event_t send_e;
  64       send_e.type = SEND;
  65       send_e.send.timestamp = e.buttonpress.timestamp;
  66       send_e.send.seq = seq++;
  67       send_e.send.send_count = 0;
  68       queue_try_add_ignoring_errors(&queue, &send_e);
  69     } break;
  70     case SEND: {
  71       uint32_t now = time_s();
  72       uint32_t ago = now - e.send.timestamp;
  73       send_report(e.send.seq, ago);
  74       e.send.send_count++;
  75       if (e.send.send_count < config_resend_count)
  76         queue_try_add_ignoring_errors(&queue, &e);
  77       /* TODO: Sleep elsewhere. */
  78       signal(e.send.send_count == 1 ? 2 : 1, 100);
  79       sleep_ms(config_resend_interval_ms);
  80     } break;
  81     default:
  82       signal_error_by_blinking();
  83     }
  84   }
  85 }
  86
  87 int main() {
  88   stdio_init_all();
  89   if (cyw43_arch_init_with_country(CYW43_COUNTRY_USA))
  90     signal_error_by_blinking();
  91   cyw43_arch_enable_sta_mode();
  92   signal(3, 100);
  93   if (cyw43_arch_wifi_connect_timeout_ms(config_wifi_ssid, config_wifi_pass,
  94                                          CYW43_AUTH_WPA2_AES_PSK, 90000))
  95     signal_error_by_blinking();
  96   signal(2, 300);
  97
  98   queue_init(&queue, sizeof(event_t), 99);
  99
 100   begin_listening_for_button_press(button_pressed);
 101
 102   service_queue();
 103 }