4.4.4. 测试指南

4.4.4.1. 测试环境

4.4.4.1.1. 硬件

开发板上安装有电池（用于给RTC供电）

4.4.4.1.2. 软件

PC端的串口终端软件，用于PC和开发板进行串口通信
Linux内核原生的rtctest工具
AiTest测试框架，用于长时间的精度测试

4.4.4.1.3. 软件配置

4.4.4.1.3.1. rtctest

在openwrt的根目录下通过make menuconfig可以打开rtctest：

Linux kernel
    Advance setting
        Linux Kernel Tools
            [*] selftests

4.4.4.2. rtctest 测试

rtctest的主要功能是测试RTC的Alarm功能，板子上的rtctest位于 /usr/lib/kselftests/rtc/，进入该目录，直接运行rtctest即可：

[aic@] # cd /usr/lib/kselftests/rtc/
[aic@rtc] # ./rtctest
TAP version 13
1..7
# Starting 7 tests from 2 test cases.
#  RUN           rtc.date_read ...
# rtctest.c:49:date_read:Current RTC date/time is 05/01/1970 21:50:57.
#            OK  rtc.date_read
ok 1 rtc.date_read
#  RUN           rtc.uie_read ...
#            OK  rtc.uie_read
ok 2 rtc.uie_read
#  RUN           rtc.uie_select ...
#            OK  rtc.uie_select
ok 3 rtc.uie_select
#  RUN           rtc.alarm_alm_set ...
# rtctest.c:137:alarm_alm_set:Alarm time now set to 21:51:06.
# rtctest.c:156:alarm_alm_set:data: 1a0
#            OK  rtc.alarm_alm_set
ok 4 rtc.alarm_alm_set
#  RUN           rtc.alarm_wkalm_set ...
# rtctest.c:195:alarm_wkalm_set:Alarm time now set to 05/01/1970 21:51:09.
#            OK  rtc.alarm_wkalm_set
ok 5 rtc.alarm_wkalm_set
#  RUN           rtc.alarm_alm_set_minute ...
# rtctest.c:239:alarm_alm_set_minute:Alarm time now set to 21:52:00.
# rtctest.c:258:alarm_alm_set_minute:data: 1a0
#            OK  rtc.alarm_alm_set_minute
ok 6 rtc.alarm_alm_set_minute
#  RUN           rtc.alarm_wkalm_set_minute ...
# rtctest.c:297:alarm_wkalm_set_minute:Alarm time now set to 05/01/1970 21:53:00.
#            OK  rtc.alarm_wkalm_set_minute
ok 7 rtc.alarm_wkalm_set_minute
# PASSED: 7 / 7 tests passed.
# Totals: pass:7 fail:0 xfail:0 xpass:0 skip:0 error:0

4.4.4.3. RTC 精度测试

测试过程需要用一个脚本来完成测试，测试步骤是：

将PC的本地时间同步到板子上；
每隔100秒去检查下板子上的RTC时间，和PC时间比较，计算一个百万秒的精度值；
重复步骤2，直到完成1百万秒的测试。

以下是测试用例的主干代码，详见AiTest/testcase/rtc/test_mod_rtc_precision.py

def test_case_rtc_precision(self):
    self.assertTrue(self.detectLinux())

    self.sync_localtime_to_target()

    loop = int(self.mega / self.delay)
    loop = 100 * int((loop + 99) / 100)
    self.logger.info(f'Do {loop} loops, {self.delay} sec each loop\n')

    for i in range(0, loop):
        self.logger.info(f"{i}/{loop}. Sleep {self.delay} sec ...")
        time.sleep(self.delay)
        self.check_current_time()