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This is going to be a strange request. I must warn that I am new to embedded programming and therefore what is obvious to you may not be to me. I am trying to implement a real time clock program with the data then being transmitted on CAN. I am getting some warning when I compile my code and cannot understand what I need to do. Any help would be appreciated. I will be posting my code in parts as I cannot exceed a certain character limit.
Why do you want to use floating point? Don't you think normal integers can manage to figure out if you have stepped past 24 hours - and how many days past? Floating point doesn't make your life easier. It makes it harder, since floating point implies rounding errors.
If you do call the function at least every 24 hours, then you can skip the division, since a comparison and optionally a subtract will do.
Agreed. Well for right now I just want to make sure that I am able to successfully keep track of time and account for a day rollover. After making the necessary changes I currently find that from 18:59:59 there is a sudden jump to 19:44. Here is what I got on the CAN network: 2944.019787 1 Statistic: D 1 R 0 XD 0 XR 0 E 0 O 0 B 0.20% 2944.798350 1 CAN_ID Rx d 6 18 59 06 10 20 08 2945.019787 1 Statistic: D 1 R 0 XD 0 XR 0 E 0 O 0 B 0.20% 2945.798605 1 CAN_ID Rx d 6 18 59 06 10 20 08 2946.019787 1 Statistic: D 1 R 0 XD 0 XR 0 E 0 O 0 B 0.19% 2946.798860 1 CAN_ID Rx d 6 18 59 06 10 20 08 2947.019787 1 Statistic: D 1 R 0 XD 0 XR 0 E 0 O 0 B 0.20% 2947.799115 1 CAN_ID Rx d 6 18 59 06 10 20 08 2948.019787 1 Statistic: D 1 R 0 XD 0 XR 0 E 0 O 0 B 0.20% 2948.799430 1 CAN_ID Rx d 6 19 44 06 10 20 08 2949.019787 1 Statistic: D 1 R 0 XD 0 XR 0 E 0 O 0 B 0.20% 2949.799705 1 CAN_ID Rx d 6 19 44 06 10 20 08 2950.019787 1 Statistic: D 1 R 0 XD 0 XR 0 E 0 O 0 B 0.20% 2950.800020 1 CAN_ID Rx d 6 19 44 06 10 20 08
So, if you ask a question here directly whenever you get stuck - exactly how will you learn how to find errors in your code? Exactly what do _you_ do right now, to figure out where you go wrong? Are you single-stepping in the debugger? Are you looking at the intermediaries?
"[...] account for a day rollover."
But you are not.
What use do you have of the time.daysb variable, when you always start with the value zero?
time.daysb = 0; if (time.daysa > time.daysb) { current_day = current_day + 1; } time.daysb = time.daysa;
After your counter reaches past 86400 - what do you think will happen on every call to the function?
What Per is saying is true. Seems like you are new to programming. It is ok to be a little ambitious in the beginning but be prepared to fight it out. Keep checking your code. Usually you will notice something wrong every 2-3 times. Also see if you can do some debugging when the code is running.
Try initializing time.daysb to 0 outside the function. Otherwise it will always be 0 and on a rollover time.days will always be greater. Also try ending the if-else ladder with just an else. Better way to end execution of the ladder.