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244 lines
8.2 KiB
Markdown
244 lines
8.2 KiB
Markdown
RTC Testing
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===========
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WARNING: Makesure that the battery is mounted on board prior to this testing.
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I have used [CR1220](https://www.amazon.com/gp/product/B0797NRXZY/) battery in
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my testing
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in each of these instructions:
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* /dev/rtc points to /dev/rtc0
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* /dev/rtc0 -> onboard BQ battery backed RTC (Does not loose time across poweroff)
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* /dev/rtc1 -> AM62 RTC (looses time when system is powered off)
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Display onboard RTC
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===================
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```
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$ sudo hwclock --verbose --show -f /dev/rtc0
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hwclock from util-linux 2.36.1
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System Time: 1665556049.094290
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Using the rtc interface to the clock.
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Last drift adjustment done at 1665555801 seconds after 1969
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Last calibration done at 1665555801 seconds after 1969
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Hardware clock is on UTC time
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Assuming hardware clock is kept in UTC time.
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Waiting for clock tick...
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ioctl(4, RTC_UIE_ON, 0): Invalid argument
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Waiting in loop for time from /dev/rtc0 to change
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...got clock tick
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Time read from Hardware Clock: 2022/10/12 06:27:30
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Hw clock time : 2022/10/12 06:27:30 = 1665556050 seconds since 1969
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Time since last adjustment is 249 seconds
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Calculated Hardware Clock drift is 0.000000 seconds
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2022-10-12 06:27:29.008229+00:00
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```
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Display on SoC RTC
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==================
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```
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$ sudo hwclock --verbose --show -f /dev/rtc1
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hwclock from util-linux 2.36.1
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System Time: 1665556066.184848
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Using the rtc interface to the clock.
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Last drift adjustment done at 1665555801 seconds after 1969
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Last calibration done at 1665555801 seconds after 1969
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Hardware clock is on UTC time
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Assuming hardware clock is kept in UTC time.
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Waiting for clock tick...
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...got clock tick
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Time read from Hardware Clock: 1970/01/01 00:44:49
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Hw clock time : 1970/01/01 00:44:49 = 2689 seconds since 1969
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Time since last adjustment is -1665553112 seconds
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Calculated Hardware Clock drift is 0.000000 seconds
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1970-01-01 00:44:48.492336+00:00
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```
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Set time on onboard RTC
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=======================
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```
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debian@BeagleBone:~$ sudo hwclock --verbose -w -f /dev/rtc0
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hwclock from util-linux 2.36.1
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System Time: 1665556128.512718
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Using the rtc interface to the clock.
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Last drift adjustment done at 1665556125 seconds after 1969
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Last calibration done at 1665556125 seconds after 1969
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Hardware clock is on UTC time
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Assuming hardware clock is kept in UTC time.
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RTC type: 'bq32k'
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Using delay: 0.000000 seconds
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missed it - 1665556128.514482 is too far past 1665556128.000000 (0.514482 > 0.001000)
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1665556129.000000 is close enough to 1665556129.000000 (0.000000 < 0.002000)
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Set RTC to 1665556129 (1665556128 + 1; refsystime = 1665556128.000000)
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Setting Hardware Clock to 06:28:49 = 1665556129 seconds since 1969
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ioctl(RTC_SET_TIME) was successful.
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Not adjusting drift factor because the --update-drift option was not used.
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New /etc/adjtime data:
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0.000000 1665556128 0.000000
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1665556128
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UTC
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```
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Set time on SoC RTC
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=======================
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```
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debian@BeagleBone:~$ sudo hwclock --verbose -w -f /dev/rtc1
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hwclock from util-linux 2.36.1
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System Time: 1665556125.096508
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Using the rtc interface to the clock.
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Last drift adjustment done at 1665555801 seconds after 1969
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Last calibration done at 1665555801 seconds after 1969
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Hardware clock is on UTC time
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Assuming hardware clock is kept in UTC time.
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RTC type: 'rtc-ti-k3'
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Using delay: 0.000000 seconds
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missed it - 1665556125.098251 is too far past 1665556125.000000 (0.098251 > 0.001000)
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1665556126.000000 is close enough to 1665556126.000000 (0.000000 < 0.002000)
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Set RTC to 1665556126 (1665556125 + 1; refsystime = 1665556125.000000)
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Setting Hardware Clock to 06:28:46 = 1665556126 seconds since 1969
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ioctl(RTC_SET_TIME) was successful.
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Not adjusting drift factor because the --update-drift option was not used.
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New /etc/adjtime data:
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0.000000 1665556125 0.000000
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1665556125
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UTC
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```
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Test time change
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================
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```
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$ sudo hwclock --verbose -w -f /dev/rtc0;sleep 10;date;sudo hwclock --verbose --show -f /dev/rtc0
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System Time: 1665556269.204641
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Using the rtc interface to the clock.
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Last drift adjustment done at 1665556128 seconds after 1969
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Last calibration done at 1665556128 seconds after 1969
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Hardware clock is on UTC time
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Assuming hardware clock is kept in UTC time.
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RTC type: 'bq32k'
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Using delay: 0.000000 seconds
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missed it - 1665556269.206367 is too far past 1665556269.000000 (0.206367 > 0.001000)
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1665556270.000000 is close enough to 1665556270.000000 (0.000000 < 0.002000)
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Set RTC to 1665556270 (1665556269 + 1; refsystime = 1665556269.000000)
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Setting Hardware Clock to 06:31:10 = 1665556270 seconds since 1969
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ioctl(RTC_SET_TIME) was successful.
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Not adjusting drift factor because the --update-drift option was not used.
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New /etc/adjtime data:
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0.000000 1665556269 0.000000
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1665556269
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UTC
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Wed Oct 12 06:31:20 UTC 2022
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hwclock from util-linux 2.36.1
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System Time: 1665556280.081153
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Using the rtc interface to the clock.
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Last drift adjustment done at 1665556269 seconds after 1969
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Last calibration done at 1665556269 seconds after 1969
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Hardware clock is on UTC time
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Assuming hardware clock is kept in UTC time.
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Waiting for clock tick...
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ioctl(4, RTC_UIE_ON, 0): Invalid argument
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Waiting in loop for time from /dev/rtc0 to change
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...got clock tick
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Time read from Hardware Clock: 2022/10/12 06:31:21
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Hw clock time : 2022/10/12 06:31:21 = 1665556281 seconds since 1969
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Time since last adjustment is 12 seconds
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Calculated Hardware Clock drift is 0.000000 seconds
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2022-10-12 06:31:20.077303+00:00
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```
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Testing with Linux kernel selftest tools
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========================================
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```
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cd linux/tools/testing/selftests/rtc
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make -j6 CROSS_COMPILE=aarch64-none-linux-gnu- ARCH=arm64'
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```
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this generates two binaries:
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* rtctest
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* setdate
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NOTE: current drivers/rtc/rtc-bq32k.c driver does'nt yet support IRQs, so alarm tests will fail. but /dev/rtc1 does support alarms
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```
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debian@BeagleBone:~$ sudo ./rtctest /dev/rtc1
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TAP version 13
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1..7
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# Starting 7 tests from 2 test cases.
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# RUN rtc.date_read ...
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# rtctest.c:47:date_read:Current RTC date/time is 12/10/2022 06:35:26.
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# OK rtc.date_read
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ok 1 rtc.date_read
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# RUN rtc.uie_read ...
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# OK rtc.uie_read
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ok 2 rtc.uie_read
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# RUN rtc.uie_select ...
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# OK rtc.uie_select
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ok 3 rtc.uie_select
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# RUN rtc.alarm_alm_set ...
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# rtctest.c:136:alarm_alm_set:Alarm time now set to 06:35:35.
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# rtctest.c:156:alarm_alm_set:data: 1a0
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# OK rtc.alarm_alm_set
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ok 4 rtc.alarm_alm_set
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# RUN rtc.alarm_wkalm_set ...
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# rtctest.c:192:alarm_wkalm_set:Alarm time now set to 12/10/2022 06:35:38.
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# OK rtc.alarm_wkalm_set
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ok 5 rtc.alarm_wkalm_set
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# RUN rtc.alarm_alm_set_minute ...
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# rtctest.c:238:alarm_alm_set_minute:Alarm time now set to 06:36:00.
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# rtctest.c:258:alarm_alm_set_minute:data: 1a0
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# OK rtc.alarm_alm_set_minute
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ok 6 rtc.alarm_alm_set_minute
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# RUN rtc.alarm_wkalm_set_minute ...
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# rtctest.c:294:alarm_wkalm_set_minute:Alarm time now set to 12/10/2022 06:37:00.
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# OK rtc.alarm_wkalm_set_minute
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ok 7 rtc.alarm_wkalm_set_minute
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# PASSED: 7 / 7 tests passed.
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# Totals: pass:7 fail:0 xfail:0 xpass:0 skip:0 error:0
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```
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```
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debian@BeagleBone:~$ sudo ./rtctest /dev/rtc0
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TAP version 13
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1..7
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# Starting 7 tests from 2 test cases.
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# RUN rtc.date_read ...
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# rtctest.c:47:date_read:Current RTC date/time is 12/10/2022 06:37:59.
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# OK rtc.date_read
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ok 1 rtc.date_read
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# RUN rtc.uie_read ...
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# rtctest.c:60:uie_read:skip update IRQs not supported.
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# OK rtc.uie_read
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ok 2 rtc.uie_read
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# RUN rtc.uie_select ...
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# rtctest.c:85:uie_select:skip update IRQs not supported.
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# OK rtc.uie_select
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ok 3 rtc.uie_select
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# RUN rtc.alarm_alm_set ...
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# rtctest.c:129:alarm_alm_set:skip alarms are not supported.
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# OK rtc.alarm_alm_set
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ok 4 rtc.alarm_alm_set
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# RUN rtc.alarm_wkalm_set ...
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# rtctest.c:185:alarm_wkalm_set:skip alarms are not supported.
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# OK rtc.alarm_wkalm_set
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ok 5 rtc.alarm_wkalm_set
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# RUN rtc.alarm_alm_set_minute ...
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# rtctest.c:231:alarm_alm_set_minute:skip alarms are not supported.
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# OK rtc.alarm_alm_set_minute
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ok 6 rtc.alarm_alm_set_minute
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# RUN rtc.alarm_wkalm_set_minute ...
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# rtctest.c:287:alarm_wkalm_set_minute:skip alarms are not supported.
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# OK rtc.alarm_wkalm_set_minute
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ok 7 rtc.alarm_wkalm_set_minute
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# PASSED: 7 / 7 tests passed.
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# Totals: pass:7 fail:0 xfail:0 xpass:0 skip:0 error:0
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```
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