set_time not working on LPC1768

[janfwesterkamp]

Description

Using the time example from https://os.mbed.com/docs/latest/reference/time.html and updating mbed-os
to the newest version (03196b2) in the mbed online compiler returns the following in the terminal:

Time as seconds since January 1, 1970 = -1
Time as a basic string = Sun Jan 1 00:00:00 1900
Time as a custom formatted string = 12:00 AM

The expected result would have been:

Time as seconds since January 1, 1970 = 1256729737
Time as a basic string = Wed Oct 28 11:35:37 2009
Time as a custom formatted string = 11:35 AM

Also not working is revision 866850a (5.9.0).
The last working revision with the expected result is 35fa909 (5.8)

Issue request type

[ ] Question
[ ] Enhancement
[x] Bug

[0xc0170]

@ARMmbed/team-nxp Please review
[Mirrored to Jira]

[Jossie90]

I stumbled upon this issue when updating to the latest mbed release (5.9.4.). I think it is caused by this commit 6d90c27, where the RTC is was disabled for this device. Adding "RTC" to targets.json solved it for me.

[Mirrored to Jira]

[0xc0170]

RTC should be reenabled (but needs to make RTC testing green first)
[Mirrored to Jira]

[mmahadevan108]

Below PR to reenable RTC on LPC1768
#8009

[Mirrored to Jira]

[kegilbert]

If RTC is disabled it'll default to using a ticker which has a known issue and pending fix (haven't looked closely into this yet, just saw the issue and it sounds like it may be related):
#7849
[Mirrored to Jira]

[adbridge]

Internal Jira reference: https://jira.arm.com/browse/IOTPART-5784

[janfwesterkamp]

With revision c53d51f (5.10.1) it's working now as expected - for me.