client: Respond to button press

[tattlekey] / client / tattlekey.c

diff --git a/client/tattlekey.c b/client/tattlekey.c
index ec7710789fbf6efcc65e8cc7b085fe3f597a8f8a..30f92a4d4e3cb804a86af133a4c058a3908acfd7 100644 (file)
--- a/client/tattlekey.c
+++ b/client/tattlekey.c
@@ -2,9 +2,34 @@
 #include "pico/stdlib.h"
 
 #include "blink.h"
+#include "button.h"
 #include "config.h"
 #include "net.h"
 
+static u16_t seq = 0;
+
+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 */
+  }
+}
+
 int main() {
   stdio_init_all();
   if (cyw43_arch_init_with_country(CYW43_COUNTRY_USA))
@@ -16,9 +41,7 @@ int main() {
                                          CYW43_AUTH_WPA2_AES_PSK, 10000))
     signal_error_by_blinking();
   signal(3, 200);
+  begin_listening_for_button_press(button_pressed);
 
-  for (int i = 0;; i++) {
-    send_report(i, 0);
-    signal(4, 200);
-  }
+  wait_forever();
 }