[CXRD-17] Added User-Alerts subsystem

- added capability to send predefined patterns of signals to the user
 using output devices e.g. buzzer/leds

Signed-off-by: Anuj Pathak <[email protected]>

include/user_alerts/user_alerts.h

@@ -0,0 +1,58 @@
+#include <stdint.h>
+#include <stdbool.h>
+#include <zephyr/kernel.h>
+
+struct alert_step {
+	uint16_t ms;
+	/* extends alert info here */
+};
+
+struct buzzer_alert_step {
+	uint16_t ms;
+	uint16_t freq;
+};
+
+struct mono_led_alert_step {
+	uint16_t ms;
+	uint8_t duty;
+};
+
+struct bi_led_alert_step {
+	uint16_t ms;
+	uint8_t duty_1;
+	uint8_t duty_2;
+};
+
+struct rgb_led_alert_step {
+	uint16_t ms;
+	uint8_t r;
+	uint8_t g;
+	uint8_t b;
+	uint8_t _rsv;
+};
+
+struct user_alerts_pattern {
+	const void *steps;
+	uint16_t steps_count;
+	uint16_t loop_count;
+};
+
+struct user_alerts_channel;
+typedef int (*user_alerts_step_exec)(const struct user_alerts_channel *ch, const void *step);
+
+struct user_alerts_channel {
+	uint8_t step_size;
+	const void *io;
+	user_alerts_step_exec exec;
+	uint16_t cur_step_idx;
+	uint16_t cur_loop_idx;
+	struct k_timer timer;
+	const struct user_alerts_pattern *pattern;
+};
+
+int user_alerts_channel_init_timer(struct user_alerts_channel *ch);
+
+int user_alerts_channel_play(struct user_alerts_channel *ch, const struct user_alerts_pattern *pattern,
+			  bool force);
+
+int user_alerts_channel_stop(struct user_alerts_channel *ch, bool force);

subsys/CMakeLists.txt

@@ -0,0 +1 @@
+add_subdirectory_ifdef(CONFIG_USER_ALERTS user_alerts)

subsys/Kconfig

@@ -0,0 +1 @@
+rsource "user_alerts/Kconfig"

subsys/user_alerts/CMakeLists.txt

@@ -0,0 +1,4 @@
+zephyr_library()
+zephyr_library_sources(
+	user_alerts.c
+)

subsys/user_alerts/Kconfig

@@ -0,0 +1,14 @@
+config USER_ALERTS
+	bool "enable user alert subsystem"
+	default y
+	help
+	  this will enable capability to signal specific pattern on any output device
+	  such as buzzer, led etc to alter user
+
+if USER_ALERTS
+
+config USER_ALERTS_CHANNEL_QUEUE_SIZE
+	int "define maximum number of pending commands"
+	default 4
+
+endif

subsys/user_alerts/user_alerts.c

@@ -0,0 +1,79 @@
+#include <zephyr/kernel.h>
+#include <user_alerts/user_alerts.h>
+
+K_MSGQ_DEFINE(user_alerts_q, sizeof(const struct user_alerts_channel *), CONFIG_USER_ALERTS_CHANNEL_QUEUE_SIZE, 1);
+
+void ch_timer_period_irq(struct k_timer *timer)
+{
+    struct user_alerts_channel *ch = k_timer_user_data_get(timer);
+    k_msgq_put(&user_alerts_q, &ch, K_NO_WAIT);
+}
+
+int user_alerts_channel_init_timer(struct user_alerts_channel *ch)
+{
+    if (!ch) {
+        return -EINVAL;
+    }
+    if (k_timer_remaining_ticks(&ch->timer) > 0) {
+        k_timer_stop(&ch->timer);
+    }
+    k_timer_init(&ch->timer, ch_timer_period_irq, NULL);
+    k_timer_user_data_set(&ch->timer, ch);
+    return 0;
+}
+
+int user_alerts_channel_stop(struct user_alerts_channel *ch, bool force)
+{
+    if (!ch) {
+        return -EINVAL;
+    }
+    ch->pattern = NULL;
+    return 0;
+}
+
+int user_alerts_channel_play(struct user_alerts_channel *ch, const struct user_alerts_pattern *pattern,
+                          bool force)
+{
+    if (!ch && !pattern && !ch->exec) {
+        return -EINVAL;
+    }
+    if (ch->pattern && (force == false)) {
+        return -EAGAIN;
+    }
+    ch->cur_step_idx = 0;
+    ch->cur_loop_idx = 0;
+    ch->pattern = pattern;
+    return k_msgq_put(&user_alerts_q, &ch, K_MSEC(1));
+}
+
+static void beeper_thread_loop(void)
+{
+    struct user_alerts_channel *ch;
+    while (true) {
+        k_msgq_get(&user_alerts_q, &ch, K_FOREVER);
+        if (ch->pattern) {
+            if ((ch->pattern->loop_count == 0) ||
+                (ch->cur_loop_idx < ch->pattern->loop_count)) {
+                const void *step = ((uint8_t *)ch->pattern->steps) + (ch->step_size * ch->cur_step_idx);
+                ch->exec(ch, step);
+                k_timer_start(&ch->timer, K_MSEC(((struct alert_step *)step)->ms),
+                              K_NO_WAIT);
+                ch->cur_step_idx++;
+                if (ch->cur_step_idx >= ch->pattern->steps_count) {
+                    ch->cur_step_idx = 0;
+                    ch->cur_loop_idx++;
+                }
+            } else {
+                ch->exec(ch, NULL);
+                ch->pattern = NULL;
+                k_timer_stop(&ch->timer);
+            }
+        } else {
+            ch->exec(ch, NULL);
+            k_timer_stop(&ch->timer);
+        }
+    }
+}
+
+K_THREAD_DEFINE(beeper_thread_id, 1024, beeper_thread_loop, NULL, NULL, NULL, K_IDLE_PRIO + 1, 0,
+                0);