[GitHub] [incubator-nuttx] gustavonihei commented on a change in pull request #4587: xtensa/esp32-s2: Adds freerun timer wrapper

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gustavonihei commented on a change in pull request #4587:
URL: https://github.com/apache/incubator-nuttx/pull/4587#discussion_r713888594



##########
File path: arch/xtensa/src/esp32s2/esp32s2_freerun.c
##########
@@ -0,0 +1,354 @@
+/****************************************************************************
+ * arch/xtensa/src/esp32s2/esp32s2_freerun.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <assert.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/irq.h>
+#include <nuttx/clock.h>
+
+#include "esp32s2_freerun.h"
+#include "esp32s2_clockconfig.h"
+#include "esp32s2_gpio.h"
+
+#ifdef CONFIG_ESP32S2_FREERUN
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define MAX_TIMERS 4
+#define MAX_US_RESOLUTION 819 /* MAX_US = (PREmax * USEC_PER_SEC) / CLKmin */ 
+#define TIMER_WIDTH 64
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: esp32s2_freerun_handler
+ *
+ * Description:
+ *   Timer interrupt callback.  When the freerun timer counter overflows,
+ *   this interrupt will occur.  It will just increment an overflow counter.
+ *
+ * Input Parameters:
+ *   irq              - IRQ associated to that interrupt.
+ *   arg              - An opaque argument provided when the interrupt
+ *                      was registered.
+ *
+ * Returned Value:
+ *   OK
+ *
+ ****************************************************************************/
+
+#ifndef CONFIG_CLOCK_TIMEKEEPING
+static int esp32s2_freerun_handler(int irq, void *context, void *arg)
+{
+  struct esp32s2_freerun_s *freerun =
+    (struct esp32s2_freerun_s *) arg;

Review comment:
       ```suggestion
     struct esp32s2_freerun_s *freerun = (struct esp32s2_freerun_s *) arg;
   ```
   nit: These two lines may be merged into a single one.




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