client: Respond to button press

[tattlekey] / client / tattlekey.c

#include "pico/cyw43_arch.h"
#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))
    signal_error_by_blinking();
  signal(1, 200);
  cyw43_arch_enable_sta_mode();
  signal(2, 200);
  if (cyw43_arch_wifi_connect_timeout_ms(wifi_ssid, wifi_pass,
                                         CYW43_AUTH_WPA2_AES_PSK, 10000))
    signal_error_by_blinking();
  signal(3, 200);
  begin_listening_for_button_press(button_pressed);

  wait_forever();
}