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1 /* tattlekey: A one-key UDP keyboard

3 *

4 * This program is free software: you can redistribute it and/or modify

5 * it under the terms of the GNU General Public License as published by

6 * the Free Software Foundation, either version 3 of the License, or

7 * (at your option) any later version.

8 *

9 * This program is distributed in the hope that it will be useful,

10 * but WITHOUT ANY WARRANTY; without even the implied warranty of

11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

12 * GNU General Public License for more details.

13 *

14 * You should have received a copy of the GNU General Public License

15 * along with this program. If not, see <https://www.gnu.org/licenses/>.

16 */

18 #include "pico/cyw43_arch.h"

19 #include "pico/stdlib.h"

20 #include "pico/util/pheap.h"

21 #include "pico/util/queue.h"

23 #include "blink.h"

24 #include "button.h"

25 #include "config.h"

26 #include "net.h"

27 #include "press.h"

29 enum event_type { NEW_BUTTON_PRESS, RESEND_TIME };

30 typedef struct {

31 enum event_type type;

32 union {

33 struct {

34 uint32_t timestamp;

35 } buttonpress;

36 };

37 } event_t;

39 queue_t queue;

 uint32_t time_s() { return time_us_64() / 1000000ul; }

43 /* Often we don't bother checking for failure (full queue) because

44 * 1. The best thing to do in this unfortunate situation is to blithely

45 * continue, dropping some events; continuing is better than stopping.

46 * 2. Neither interrupt context nor queue-processing context can block

47 * until space is available, or even sit around & blink the LED to

48 * signal a problem.

49 * (We also get a bit of type safety by taking event_t* rather than void*.) */

 static void queue_try_add_ignoring_errors(queue_t *q, event_t *e) {

51 queue_try_add(q, e);

52 }

54 static void button_pressed() {

55 /* This runs in interrupt context; don't linger. */

56 static uint64_t last_button_press_time = 0;

57 uint32_t now = time_s();

58 uint32_t time_since_last_press = now - last_button_press_time;

59 if (time_since_last_press >= config_minimum_seconds_between_button_presses) {

60 last_button_press_time = now;

61 event_t e;

62 e.type = NEW_BUTTON_PRESS;

63 e.buttonpress.timestamp = now;

64 queue_try_add_ignoring_errors(&queue, &e);

65 }

66 }

68 static void time_to_send(uint _) {

69 /* This runs in interrupt context; don't linger. */

70 event_t e;

71 e.type = RESEND_TIME;

72 queue_try_add_ignoring_errors(&queue, &e);

73 }

 void set_resend_alarm(int alarm, uint32_t now, uint32_t next_act_time) {

76 uint32_t sleep_duration = next_act_time - now;

   if (hardware_alarm_set_target(alarm,

                                 make_timeout_time_ms(sleep_duration * 1000)))

79 signal_error_by_blinking();

80 }

 void service_sleeps(int alarm, press_pile_t *pp) {

83 hardware_alarm_cancel(alarm);

85 while (1) {

86 uint32_t now = time_s();

     int32_t act_time = next_scheduled_send(pp);

     if (act_time == -1)

89 return;

90 if (act_time > now) {

       set_resend_alarm(alarm, now, act_time);

92 return;

93 }

94 press_t press;

     if (!get_press_due_for_resend(pp, now, &press))

96 signal_error_by_blinking();

97 u32_t ago = now - press.timestamp;

     send_report_packet(press.seq, ago);

99 press.send_count++;

     if (press.send_count < config_resend_count) {

101 add_press(pp, &press);

102 }

103 }

104 }

105

106 void service_queue() {

   int alarm = hardware_alarm_claim_unused(true);

   if (alarm == -1)

109 signal_error_by_blinking();

110 hardware_alarm_set_callback(alarm, time_to_send);

111

112 press_pile_t *pp = create_press_pile();

113 u16_t seq = 0;

114 while (1) {

115 service_sleeps(alarm, pp);

116

117 event_t e;

118 queue_remove_blocking(&queue, &e);

119 switch (e.type) {

120 case NEW_BUTTON_PRESS: {

       add_press(pp, &(press_t){e.buttonpress.timestamp, seq++, 0});

       if (seq == 0)

123 new_epoch();

124 } break;

125 case RESEND_TIME: {

126 /* OK, we're awake. Cool. Thanks! (We actually do the sends in the

127 * service_sleeps() call at the top of the loop.) */

128 } break;

129 default:

130 signal_error_by_blinking();

131 }

132 }

133 }

134

135 int main() {

136 stdio_init_all();

   if (cyw43_arch_init_with_country(CYW43_COUNTRY_USA))

138 signal_error_by_blinking();

139 cyw43_arch_enable_sta_mode();

   signal(3, 100);

   if (cyw43_arch_wifi_connect_timeout_ms(config_wifi_ssid, config_wifi_pass,

142 CYW43_AUTH_WPA2_AES_PSK, 90000))

143 signal_error_by_blinking();

   signal(2, 300);

145

   queue_init(&queue, sizeof(event_t), 99);

147

148 begin_listening_for_button_press(button_pressed);

149

150 service_queue();

151 }