feat(tick): add lv_delay

src/tick/lv_tick.c

@@ -80,11 +80,34 @@ uint32_t lv_tick_elaps(uint32_t prev_tick)
     return prev_tick;
 }
 
+void lv_delay_ms(uint32_t ms)
+{
+    if(state.delay_cb) {
+        state.delay_cb(ms);
+    }
+    else {
+        uint32_t t = lv_tick_get();
+        while(lv_tick_elaps(t) < ms) {
+            /*Do something to no call `lv_tick_elaps` too often as it might interfere with interrupts*/
+            volatile uint32_t i;
+            volatile uint32_t x = ms;
+            for(i = 0; i < 100; i++) {
+                x = x * 3;
+            }
+        }
+    }
+}
+
 void lv_tick_set_cb(lv_tick_get_cb_t cb)
 {
     state.tick_get_cb = cb;
 }
 
+void lv_delay_set_cb(lv_delay_cb_t cb)
+{
+    state.delay_cb = cb;
+}
+
 /**********************
  *   STATIC FUNCTIONS
  **********************/

src/tick/lv_tick.h

@@ -30,10 +30,13 @@ extern "C" {
  **********************/
 typedef uint32_t (*lv_tick_get_cb_t)(void);
 
+typedef void (*lv_delay_cb_t)(uint32_t ms);
+
 typedef struct {
     uint32_t sys_time;
     volatile uint8_t sys_irq_flag;
     lv_tick_get_cb_t tick_get_cb;
+    lv_delay_cb_t delay_cb;
 } lv_tick_state_t;
 
 /**********************
@@ -42,29 +45,43 @@ typedef struct {
 
 /**
  * You have to call this function periodically
- * @param tick_period the call period of this function in milliseconds
+ * @param tick_period   the call period of this function in milliseconds
  */
 LV_ATTRIBUTE_TICK_INC void lv_tick_inc(uint32_t tick_period);
 
 /**
  * Get the elapsed milliseconds since start up
- * @return the elapsed milliseconds
+ * @return          the elapsed milliseconds
  */
 uint32_t lv_tick_get(void);
 
 /**
  * Get the elapsed milliseconds since a previous time stamp
- * @param prev_tick a previous time stamp (return value of lv_tick_get() )
- * @return the elapsed milliseconds since 'prev_tick'
+ * @param prev_tick     a previous time stamp (return value of lv_tick_get() )
+ * @return              the elapsed milliseconds since 'prev_tick'
  */
 uint32_t lv_tick_elaps(uint32_t prev_tick);
 
+/**
+ * Delay for the given milliseconds.
+ * By default it's a blocking delay, but with `lv_delay_set_cb()`
+ * a custom delay function can be set too
+ * @param ms        the number of milliseconds to delay
+ */
+void lv_delay_ms(uint32_t ms);
+
 /**
  * Set the custom callback for 'lv_tick_get'
- * @param cb call this callback on 'lv_tick_get'
+ * @param cb        call this callback on 'lv_tick_get'
  */
 void lv_tick_set_cb(lv_tick_get_cb_t cb);
 
+/**
+ * Set a custom callback for 'lv_dalay_ms'
+ * @param cb        call this callback in 'lv_dalay_ms'
+ */
+void lv_delay_set_cb(lv_delay_cb_t cb);
+
 /**********************
  *      MACROS
  **********************/