[CXRD-17] Added bootup buzzer signal using User-Alerts

- defined "croxel inc" morse code in user_alert structure
- user user-alerts to play "croxel inc" morse code on bootup

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

Author: cx-anuj-pathak

app/CMakeLists.txt

@@ -9,4 +9,5 @@ target_include_directories(app PRIVATE
 
 target_sources(app PRIVATE
 	src/main.c
+	src/buzzer.c
 )

app/boards/croxel_cx1825.overlay

@@ -0,0 +1,14 @@
+/ {
+        aliases {
+                buzzer-pwm = &buzzer;
+        };
+
+        pwmbuzzer {
+                compatible = "pwm-leds";
+                status = "okay";
+
+                buzzer: buzzer_pwm {
+                        pwms = <&pwm0 0 PWM_HZ(4000) PWM_POLARITY_NORMAL>;
+                };
+        };
+};

app/prj.conf

@@ -1 +1,2 @@
 CONFIG_LOG=y
+CONFIG_PWM=y

app/src/buzzer.c

@@ -0,0 +1,68 @@
+#include <zephyr/kernel.h>
+#include <zephyr/logging/log.h>
+#include <zephyr/drivers/pwm.h>
+#include <user_alerts/user_alerts.h>
+
+LOG_MODULE_REGISTER(buzzer);
+
+#define MORSE_DI_FREQ      4400
+#define MORSE_DA_FREQ      3600
+#define MORSE_TIME_MS      100
+#define MORSE_SPACE        {.freq = 0, .ms = MORSE_TIME_MS}
+#define MORSE_DI           {.freq = MORSE_DI_FREQ, .ms = 1 * MORSE_TIME_MS}, MORSE_SPACE
+#define MORSE_DA           {.freq = MORSE_DA_FREQ, .ms = 3 * MORSE_TIME_MS}, MORSE_SPACE
+#define MORSE_LETTER_SPACE MORSE_SPACE, MORSE_SPACE, MORSE_SPACE
+#define MORSE_WORD_SPACE   MORSE_LETTER_SPACE, MORSE_LETTER_SPACE, MORSE_SPACE
+
+static const struct buzzer_alert_step _bootup_buzzer_beep_steps[] = {
+    MORSE_DA, MORSE_DI, MORSE_DA, MORSE_DI, MORSE_LETTER_SPACE, /* c */
+    MORSE_DI, MORSE_DA, MORSE_DI, MORSE_LETTER_SPACE,           /* r */
+    MORSE_DA, MORSE_DA, MORSE_DA, MORSE_LETTER_SPACE,           /* o */
+    MORSE_DA, MORSE_DI, MORSE_DI, MORSE_DA, MORSE_LETTER_SPACE, /* x */
+    MORSE_DI, MORSE_LETTER_SPACE,                               /* e */
+    MORSE_DI, MORSE_DA, MORSE_DI, MORSE_DI, MORSE_LETTER_SPACE, /* l */
+    MORSE_WORD_SPACE,                                           /*   */
+    MORSE_DI, MORSE_DI, MORSE_LETTER_SPACE,                     /* i */
+    MORSE_DA, MORSE_DI, MORSE_LETTER_SPACE,                     /* n */
+    MORSE_DA, MORSE_DI, MORSE_DA, MORSE_DI, MORSE_LETTER_SPACE, /* c */
+    MORSE_WORD_SPACE,                                           /*   */
+    MORSE_WORD_SPACE,                                           /*   */
+};
+
+static const struct user_alerts_pattern _bootup_buzzer_beeps = {
+    .steps = _bootup_buzzer_beep_steps,
+    .steps_count = ARRAY_SIZE(_bootup_buzzer_beep_steps),
+    .loop_count = 2,
+};
+
+int pwm_user_alerts_step_exec(const struct user_alerts_channel *ch, const void *step)
+{
+    int err;
+    const struct buzzer_alert_step *b_step = step;
+    const struct pwm_dt_spec *pwm = ch->io;
+
+    err = (b_step && b_step->freq)
+              ? pwm_set_dt(pwm, PWM_HZ(b_step->freq), PWM_HZ(b_step->freq) / 2)
+              : pwm_set_dt(pwm, PWM_HZ(4000), 0);
+    return err;
+}
+
+static const struct pwm_dt_spec _buzzer_ch_pwm = PWM_DT_SPEC_GET(DT_ALIAS(buzzer_pwm));
+static struct user_alerts_channel _buzzer_ch = {
+    .step_size = sizeof(_bootup_buzzer_beep_steps[0]),
+    .io = &_buzzer_ch_pwm,
+    .exec = pwm_user_alerts_step_exec,
+    .cur_step_idx = 0,
+    .cur_loop_idx = 0,
+    /*".timer" wil be init using api */
+    .pattern = NULL,
+};
+
+int play_bootup_buzzer_beeps(void)
+{
+    user_alerts_channel_init_timer(&_buzzer_ch);
+    user_alerts_channel_play(&_buzzer_ch, &_bootup_buzzer_beeps, true);
+    return 0;
+}
+
+SYS_INIT(play_bootup_buzzer_beeps, APPLICATION, 99);