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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2020/09/04 17:46:10 UTC

[GitHub] [incubator-nuttx] xiaoxiang781216 commented on a change in pull request #1705: nRF52: refactor system timer handling; support tickless and nontickless using RTC/systick

xiaoxiang781216 commented on a change in pull request #1705:
URL: https://github.com/apache/incubator-nuttx/pull/1705#discussion_r483765306



##########
File path: arch/arm/src/nrf52/Make.defs
##########
@@ -89,7 +89,7 @@ ifeq ($(CONFIG_ARCH_CHIP_NRF52832),y)
 CHIP_CSRCS += nrf52832_errdata.c
 endif
 
-CHIP_CSRCS += nrf52_timerisr.c
+CHIP_CSRCS += nrf52_systimer.c

Review comment:
       need rename the comment "arch/arm/src/nrf52/nrf52_timerisr.c" to "arch/arm/src/nrf52/nrf52_systimer.c"

##########
File path: arch/arm/src/nrf52/nrf52_rtc_lowerhalf.h
##########
@@ -0,0 +1,58 @@
+/****************************************************************************
+ * arch/arm/src/nrf52/nrf52_rtc_lowerhalf.h
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_NRF52_NRF52_RTC_LOWERHALF_H
+#define __ARCH_ARM_SRC_NRF52_NRF52_RTC_LOWERHALF_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <nrf52_rtc.h>
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nrf52_rtc_initialize
+ *
+ * Description:
+ *   Bind the configuration timer to a timer lower half instance and
+ *   register the timer drivers at 'devpath'
+ *
+ * Input Parameters:
+ *   devpath - The full path to the timer device.  This should be of the
+ *     form /dev/timer0
+ *   timer - the timer's number.
+ *   timer_drvr - Pointer where to store resulting timer_lowerhalf_s*
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; A negated errno value is returned
+ *   to indicate the nature of any failure.
+ *
+ ****************************************************************************/
+
+int nrf52_rtc_initialize(FAR const char *devpath, uint8_t timer,
+                         FAR struct timer_lowerhalf_s **timer_drvr);

Review comment:
       Does NFR52 RTC will clear the count when the count value equal comparison value? If the anwser isn't, it's better to export RTC through oneshot_lowerhalf_s interface, because the timestamp implemented through arch_timer(timer_lowerhalf_s) will be drift in the long run.




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