X-Git-Url: http://git.scottworley.com/tattlekey/blobdiff_plain/d1521eda56a4768dbf481aa6cf9e75c5a5a7e7f1..38d971ac5039ae385ceed19e9f02722b60913f15:/client/tattlekey.c

diff --git a/client/tattlekey.c b/client/tattlekey.c
index 30f92a4..3a1f7b7 100644
--- a/client/tattlekey.c
+++ b/client/tattlekey.c
@@ -1,32 +1,25 @@
 #include "pico/cyw43_arch.h"
 #include "pico/stdlib.h"
+#include "pico/util/queue.h"
 
 #include "blink.h"
 #include "button.h"
 #include "config.h"
 #include "net.h"
 
-static u16_t seq = 0;
+queue_t queue;
 
 static void button_pressed() {
-  /* TODO: This is interrupt context.  We need to get out of interrupt context
-   * quickly; we should not be doing significant work here, & definitely
-   * shouldn't be sleeping here.  We signal errors with blinking the LED, which
-   * involves sleeping, so this all has to move. */
-  send_report(seq++, 0);
-  signal(4, 200);
-}
-
-static void wait_forever() {
-  /* pico-examples/gpio/hello_gpio_irq/hello_gpio_irq.c implements wait-forever
-   * as "while (1);", but
-   * https://www.raspberrypi.com/documentation/pico-sdk/high_level.html#gaf469c6d691230e9d1008
-   * says sleeping uses less power, so we sleep.  */
-  while (1) {
-    /* https://www.raspberrypi.com/documentation/pico-sdk/hardware.html#rpip7ce2cdc1662dce59296b
-     * says the maximum sleep is 2^32 - 1 microseconds (~71.58 minutes), so we
-     * sleep in chunks. */
-    sleep_ms(1 << 31); /* 35.79 minutes */
+  /* This runs in interrupt context; don't linger.  */
+  static uint64_t last_button_press_time = 0;
+  uint64_t now = time_us_64();
+  uint64_t time_since_last_press = now - last_button_press_time;
+  if (time_since_last_press > minimum_microseconds_between_button_presses) {
+    last_button_press_time = now;
+    char zero = '\0';
+    /* We don't check for failure (full queue) here because there's not much to
+     * be done about it. */
+    queue_try_add(&queue, &zero);
   }
 }
 
@@ -34,14 +27,22 @@ int main() {
   stdio_init_all();
   if (cyw43_arch_init_with_country(CYW43_COUNTRY_USA))
     signal_error_by_blinking();
-  signal(1, 200);
   cyw43_arch_enable_sta_mode();
-  signal(2, 200);
+  signal(3, 100);
   if (cyw43_arch_wifi_connect_timeout_ms(wifi_ssid, wifi_pass,
-                                         CYW43_AUTH_WPA2_AES_PSK, 10000))
+                                         CYW43_AUTH_WPA2_AES_PSK, 90000))
     signal_error_by_blinking();
-  signal(3, 200);
+  signal(2, 300);
+
+  queue_init(&queue, 1, 99);
+
   begin_listening_for_button_press(button_pressed);
 
-  wait_forever();
+  u16_t seq = 0;
+  while (1) {
+    char _;
+    queue_remove_blocking(&queue, &_);
+    send_report(seq++, 0);
+    signal(2, 100);
+  }
 }