pref: 修改蜂鸣器为非阻塞形式

app/by_buzzer.c

@@ -3,8 +3,10 @@
 #include <string.h>
 #include "zf_common_headfile.h"
 
-#define BUZZER_QUEUE_LENGTH 40
+#define BUZZER_TIME         (100) // 蜂鸣器音节长度
+#define BUZZER_QUEUE_LENGTH (40)
 
+uint32_t time_out   = 0;
 uint16_t queue_long = 0;
 uint32_t a[40]      = {0};
 
@@ -59,9 +61,15 @@ void by_buzzer_add(uint16_t tone)
 void by_buzzer_run(void)
 {
     if (queue_long != 0) {
-        pwm_init(BUZZER_PIN, a[0], 5000);
-        queue_pop_element();
-        system_delay_ms(100);
+
+        if (0 == time_out) {
+            pwm_init(BUZZER_PIN, a[0], 5000);
+            queue_pop_element();
+            time_out = BUZZER_TIME;
+        } else {
+            time_out--;
+        }
+    } else {
         pwm_set_duty(BUZZER_PIN, 0);
     }
 }