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 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 }