Difference: RealTimeClock (1 vs. 6)

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Intro

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Most MCUs integrate a real time clock as peripheral. STM32 MCUs are no different. Many designs have its own 32.768 kHz quartz for precise timing, about 10 ppm without trimming.

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Most MCUs integrate a real time clock as peripheral. STM32 MCUs are no different. Many designs have their own 32.768 kHz quartz for precise timing, about 10 ppm without trimming.

Contents

Revision 52022-12-04 - PeterSchmid

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 Intro 
 
Most MCUs integrate a real time clock as peripheral. STM32 MCUs are no different. Many designs have its own 32.768 kHz quartz for precise timing, about 10 ppm without trimming.






 Contents 
 
 
  RTC Words
   How to Use 
  Set the current date and time
   Set Alarms
 
 






 

 RTC Words
 Epoch is 1.1.1970 (Unix time stamp). But valid dates are from 1.1.2000 to 31.12.2099 because of the STM32 RTC peripheral.
-<
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+time@          (  -- u )      Returns the unix time stamp. 
time!          ( u --  )      Sets the real time clock.
.time          ( -- )         Prints the current date and time (YYYY-MM-DDTHH:MM:SS ISO 8601).
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+time@          (  -- u )      Return the unix time stamp. 
time!          ( u --  )      Set the real time clock.
.time          ( -- )         Print the current date and time (YYYY-MM-DDTHH:MM:SS ISO 8601).

clktime        ( -- u )       hour*10000 + minute*100 + second
clkdate        ( -- u )       Year*10000 + Month*100 + Day
time&date      ( -- n1 n2 n3 n4 n5 n6 )  Return the current time and date.
                              n1 second {0...59}, n2 minute {0...59}, n3 hour {0...23}, 
                              n4 day {1...31} n5 month {1...12}, n6 year (e.g. 1991) *
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+date                          Prints date unix style Mon Jan  1 01:57:52 2000
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+date                          Print date unix style Mon Jan  1 01:57:52 2000
 wait-alarm     ( -- )         Wait for an alarm
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+alarm!         (h m s -- )    Sets the alarm, invalid parameters e.g. -1 mask the parameter
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+alarm!         (h m s -- )    Set the alarm, invalid parameters e.g. -1 mask the parameter

ms             ( u -- )       Wait at least u millisecond (osDelay) *

*) part of ansification.fs
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+ How to set the current date and time?
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+ How to Use 

 Set the current date and time
 Copy the current time stamp from a Unix machine (GNU/Linux box) or from https://www.unixtimestamp.com/:
 Launch! ok.
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 --   Peter Schmid  - 2020-10-11

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Real Time Clock

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Epoch is 1.1.1970 (Unix time stamp). But valid dates are from 1.1.2000 to 31.12.2099 because of the STM32WB RTC peripheral.

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Epoch is 1.1.1970 (Unix time stamp). But valid dates are from 1.1.2000 to 31.12.2099 because of the STM32 RTC peripheral.

time@          (  -- u )      Returns the unix time stamp.

Revision 32021-01-28 - PeterSchmid

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Real Time Clock

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Peter Schmid - 2020-10-11

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Comments

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This work by Peter Schmid is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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Real Time Clock

Epoch is 1.1.1970 (Unix time stamp). But valid dates are from 1.1.2000 to 31.12.2099 because of the STM32WB RTC peripheral.

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time! ( -- u ) Returns the unix time stamp. time@ ( u -- ) Sets the real time clock.

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time@ ( -- u ) Returns the unix time stamp. time! ( u -- ) Sets the real time clock.

.time ( -- ) Prints the current date and time (YYYY-MM-DDTHH:MM:SS ISO 8601).

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date

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date Prints date unix style Mon Jan 1 01:57:52 2000

wait-alarm ( -- ) Wait for an alarm alarm! (h m s -- ) Sets the alarm, invalid parameters e.g. -1 mask the parameter

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How to set the current date and time?

Copy the current time stamp from a Unix machine (GNU/Linux box) or from https://www.unixtimestamp.com/:

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Sun Oct 11 15:36:02 2020

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Set Alarms

Wake me at 06:00

6 0 0 alarm! wait-alarm .( Get Up!)[RET] Get Up! ok.

If you want an alarm every second:

-1 -1 -1 alarm![RET]  ok.

for every minute:

-1 -1 0 alarm![RET]  ok.

Stop the alarms:

0 0 0 alarm![RET]  ok.

: count-down ( -- )
 -1 -1 -1 alarm!  \ an alarm every second
  10 0 do
    cr 10 i - .
    wait-alarm  
  loop
  cr ." 0 Launch!"
;

count-down[RET]
10 
9 
8 
7 
6 
5 
4 
3 
2 
1 
0 Launch! ok.

Peter Schmid - 2020-10-11

Comments

Revision 12020-10-11 - PeterSchmid

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Added:

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META TOPICPARENT	name="WebHome"

Real Time Clock

Epoch is 1.1.1970 (Unix time stamp). But valid dates are from 1.1.2000 to 31.12.2099 because of the STM32WB RTC peripheral.

time!          (  -- u )      Returns the unix time stamp. 
time@          ( u --  )      Sets the real time clock.
.time          ( -- )         Prints the current date and time (YYYY-MM-DDTHH:MM:SS ISO 8601).

date

How to set the current date and time?

Copy the current time stamp from a Unix machine (GNU/Linux box) or from https://www.unixtimestamp.com/:

$ date +%s
1602430522

Paste the time stamp in the Mecrisp-Cube console:

 ok.
1602430522 time![RET]  ok.
.time[RET] 2020-10-11T15:35:27 ok.
date[RET] 
Sun Oct 11 15:36:02 2020

-- Peter Schmid - 2020-10-11

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