更新CPU工程ITU驱动：修复原ITU驱动中断内2毫秒延时导致的CPU频繁被占用的问题。

amt630hv160-freertos-beta/ArkmicroFiles/libcpu-amt630hv160/source/itu.c

@@ -63,6 +63,8 @@
 #define ITUFRAME_MAX_WIDTH					VIN_WIDTH
 #define ITUFRAME_MAX_HEIGHT					VIN_HEIGHT
 
+#define ITU_TIMEOUT_TIMER                   TIMER_ID3
+
 typedef struct {
 	uint32_t yaddr;
 	uint32_t uvaddr;
@@ -76,6 +78,7 @@ static SemaphoreHandle_t itu_mutex = NULL;
 static void *itu_buf = NULL;
 static int itu_enable = 0;
 static int itu_take_video = 0;
+static unsigned int itu_int_status = 0;
 
 
 static unsigned int itu_get_frame_yadde(unsigned int itu_id)
@@ -105,38 +108,49 @@ static unsigned int itu_get_frame_uvadde(unsigned int itu_id)
 static void itu_interupt_handler(void *param)
 {
 	unsigned int status = readl(itubase + ITU_INT_STATUS);
-	unsigned int height = 0, wide = 0;
+
+    writel(0x0, itubase + ITU_INT_EN);
+    itu_int_status = status;
+    vTimerEnable(ITU_TIMEOUT_TIMER);
+}
+
+static void itu_timeout_callback(void *param)
+{
+    unsigned int height = 0, wide = 0;
 	unsigned int totheight = 0, totwide = 0;
 	unsigned int curr_handle_frame_id = 0;
 
-	mdelay(2);
+    writel(0x2, itubase + ITU_INT_EN);
 
-	//clear inter
-	writel(status & 0xf0, itubase + ITU_INT_STATUS);
+    //clear inter
+	writel(itu_int_status & 0xf0, itubase + ITU_INT_STATUS);
 
-	if ((status >> 4) & 0x1) {
-		unsigned int val;
-		val = readl(itubase + ITU_DET_REG3) ;
-		height = (val >> 12) & 0xFFF;
-		wide = val & 0xFFF;
+    if ((itu_int_status >> 4) & 0x1) {
+        unsigned int val;
+        val = readl(itubase + ITU_DET_REG3) ;
+        height = (val >> 12) & 0xFFF;
+        wide = val & 0xFFF;
 
-		val = readl(itubase + ITU_DET_REG2) ;
-		totheight = (val >> 12) & 0xFFF;
-		totwide = val & 0xFFF;
-		printf(">>>>height = %d, wide= %d, totheight = %d, totwide= %d\n", height, wide, totheight, totwide);
-	}
+        val = readl(itubase + ITU_DET_REG2) ;
+        totheight = (val >> 12) & 0xFFF;
+        totwide = val & 0xFFF;
+        printf(">>>>height = %d, wide= %d, totheight = %d, totwide= %d\n", height, wide, totheight, totwide);
+    }
 
-	if ((status >> 6) & 0x1) {
-		unsigned int itu_dis_id = 1;
+    if ((itu_int_status >> 6) & 0x1) {
+        unsigned int itu_dis_id = 1;
 
-		curr_handle_frame_id = readl(itubase + ITU_WR_STATUS) & 0x3;
-		if (curr_handle_frame_id != 0)
-			itu_dis_id = curr_handle_frame_id - 1;
-		else
-			itu_dis_id = 3;
+        curr_handle_frame_id = readl(itubase + ITU_WR_STATUS) & 0x3;
+        if (curr_handle_frame_id != 0)
+            itu_dis_id = curr_handle_frame_id - 1;
+        else
+            itu_dis_id = 3;
 
-		xTaskNotifyFromISR(itu_task, itu_dis_id, eSetValueWithOverwrite, 0);
-	}
+        xTaskNotifyFromISR(itu_task, itu_dis_id, eSetValueWithOverwrite, 0);
+    }
+
+    vTimerClrInt(ITU_TIMEOUT_TIMER);
+    vTimerDisable(ITU_TIMEOUT_TIMER);
 }
 
 void itu_clear_addr_for_hwuse(void)
@@ -519,6 +533,11 @@ int itu_init(void)
 		printf("create itu display task fail.\n");
 		return -1;
 	}
+
+	request_irq(TIMER3_IRQn, 0, itu_timeout_callback, NULL);
+    vTimerInit(ITU_TIMEOUT_TIMER, 1, 0, 500);
+
 	request_irq(ITU_IRQn, 0, itu_interupt_handler, NULL);
+
 	return 0;
 }