添加cpu时钟周期延时

driver/src/hal/clock.c

@@ -65,6 +65,26 @@ void IRAM_ATTR iot_delay_us_cpu_cycle(uint32_t us)
     }
 }
 
+void IRAM_ATTR iot_delay_cpu_cycle(uint32_t c)
+{
+    uint64_t start, now;
+    uint64_t cycle = c;
+
+    start = cpu_get_mcycle();
+
+    while(1) {
+        now = cpu_get_mcycle();
+        if (now >= start) {
+            if((now - start) > cycle)
+                break;
+        } else {
+            if(((uint64_t)(-1) - start + now) > cycle)
+                break;
+         }
+    }
+}
+
+
 void system_cpu_sleep(bool_t tick)
 {
     clk_sys_sleep(tick);

inc/driver/iot_clock.h

@@ -36,6 +36,8 @@ void iot_delay_us(uint32_t us);
  */
 void iot_delay_us_cpu_cycle(uint32_t us);
 
+void iot_delay_cpu_cycle(uint32_t c);
+
 void system_cpu_sleep();
 
 void system_cpu_wakeup();