[EXCLUSIVE] Download Clock Timer

Set the hour, minute, and second for the online countdown timer, and start it. Alternatively, you can set the date and time to count days, hours, minutes, and seconds till (or from) the event. The timer triggered alert will appear, and the pre-selected sound will be played at the set time.

Assuming you are using SMCLK as the clock source for timerB, you will need to pick a fundamental frequency that you can divide with one of the TBCCRx count registers, lets say TBCCR1 for this example. This is tricky considering 1/500kHz = 2us, 1/600kHz = 1.67us and 1/700kHz = 1.43us.

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Fortunately, the FR2355 can operate up to 24Mhz which can provide more granularity for the timer. So if you set the SMCLK to 24Mhz this would provide a timer resolution of 1/24Mhz or 41.67nS. With the timer configured in the UP mode (timer counts from 0 up to = TB0CCR1) you could use the following TB0CCR1 values.

It seems that the value of Timer Interval Load register is set incorrectly for the timer that is used as a source of system clock. With my current setting (Clock.tickPeriod = 50;) of 50 us system clock period and processor clocked at 120Mhz I would expect the interval load value to be (1200000000 / 20000) - 1 = 5999. But when I checked in register viewer in ccs the register is set to 6000. It looks like 1 is not being subtracted from the value to account for timer counting from the interval load value down to (and including) 0.

Hopefully this is closer to what you're looking for. Based on the ti.sysbios.knl.Clock module documentation you can create your own timer and have the system tick based on it. In this way you can specify that you want your timer to count in clock cycles rather than microseconds. Here is an example of the configuration changes that would be needed, in addition to the C code to call Clock_tick():

Per the title google clock app timer doesn't go off unless the screen is unlocked and the app is open, any suggested solutions? I've tried; turning off app sleeping, restarting the phone, and reinstalling the app, none of these solved the issue.

I'd like to see some sample code (or a link to it) that utilizes a timer fed by an external clock, not the system clock, to generate an output pulse. All ST's sample code that I've seen so far uses the system clock. Here's what I'm trying to do:

I am trying to use the clock module as a timer to build a metronome. To test things out I set the timer to 1000s ms and each time the event occurs I play a sound (the sound mp3 file is about 100ms long)

What I find is that when I compared to my computer's seconds clock, there is a lag in time. In other words, the AI2's clock timer seems to get out of phase with the computer's clock after about 50s.

I modified an old (unpublished) extension that I almost forgot.

Run this app (timer with a metronome sound) against a chronometer. It shouldn't lose a single millisecond (even if it's been running for hours).

I want to play a sound every 250ms. I have a timer that fires every 250ms. I verified that it was counting 4 every 1second so the timer is firing correctly. Now I want to play a sound every 250 ms so I get 4 beats every second. It is the same sound and is in .wav format. I have uploaded the source file to the sound component and set the source file at the start.

The problem is the interval between sounds is not uniform. It stutters. If I set the timer so that it plays a sound every 1second, it seems to sound correct.

The sound file is only 50ms long. There is seems to be some internal delay that is causing non-unformity when I play at intervals less than 1000msec. The shorter the duration, the worse it is.

I have set the minimum interval to be 10ms.

I have the timer working correctly but the sound appears to be non-uniform when bpm is set to 120 i.e. 2 beats per second.

I have a fast counter at 100ms marking time and the audio file is 50ms

I have attached the aia file. I could not upload the audio file which is .wav format but you can substitute any sound you want.

Thanks for your help.

If I understand you right, for each metronome bpm setting, I need to source the corresponding ogg file and use Taifun player to loop which will operate independently of the timer interrupt? And the sounds in each ogg file should be spaced just right so that timing is correct?

This assumes that I have a prepopulated list of metronome settings and corresponding ogg files.

If I want any arbitrary integer value between 60 and 120, I have to generate and store 61 different ogg files?

I am not as familiar with timer interrupts and the player so I am learning by building a metronome which I can use for my music practice. Sure, I can download one among many out there but it is more satisfying to use one that I built (with help from the community, of course

I was testing it with a few values of BPM to see how the timer and the player works. While looping with a discrete set of ogg files is a good idea if you have a few values (and is a useful tool to have in my toolbox), for arbitrary integer inputs within a range this method would not be practical.

The STM32H743 datasheet says nothing about clocking the timers. Reference manual has a chapter dedicated to each timer's counter clocking. For each type of timer the only clock is so called "Internal Clock" CK_INT . What is it? Opened my project's CubeMX Clock Configuration and I don't find such label there. Trying to guess which clock could be used to run timers, I'd assume one of those: APB1 Timer clocks or APB2 timer clocks .

Thank you Jan - this was a good pointer to find the answer. Although the way to find it in that chapter was also not straight forward. I expected to find something like a table showing what clock drives what peripheral. Nothing of the sort, even in the chapter 8.5.10 called "Peripheral allocation" there is no really specific peripheral allocation given. But I found it indirectly browsing through the description of all the RCC clock registers until I found the bit for TIM6 .

But how exactly clocks for *timers* are generated, is somewhat convoluted, it's not straightforwardly equal to the respective APB bus frequency. See System clock generation subchapter of RCC chapter, rcc_timx_ker_ck and rcc_timy_ker_ck (for timers on APB1 and APB2, respectively); observe the Core and bus clock generation figure and Ratio between clock timer and pclk table, and then check the description of RCC_D2CFGR.DD2PPREx and RCC_CFGR.TIMPRE bits referenced there.

Indeed, I also failed to see any use of the kernel clocking to gate RCC bus clocking. I am using CubeMX for clock generation. All I need is to know which clock bus is driving each peripheral. This allows to configure clock bus' prescaler, get proper bus output frequency (for ex. APB1 output), then configure Timer peripheral counter prescaler and ARR, and hence get proper output timing. So this "clock bus + kernel gating" staff is not even in the CubeMX picture. If CubeMX clocking configuration does not care about peripheral kernel gating, I conclude we developers don't need it...

Very similar clock configuration tool for similar Cortex-M7 MCU by Microchip MPLAB Harmony shows rcc clocking for each named peripheral on the same clock configuration diagram. By checking the activation box for a given peripheral I allow it's clocking (activation) from the clearly shown clock bus. And I do configuration of that clock bus the same way as in CubeMX... easy, no research of a datasheet required .. (yet they have other much more severe problems than this)...

My 1 second interrupt is working (I commute a GPIO to measure the period) but there is a WEIRD problem with the Timer 5 ! I put a waveform generator on the timer input and I can count something but there is /100 ratio on the value ! If I put 1Khz, I read 10 Hz...

Write your own, making sure FLASH latency and VOS settings are appropriate for the frequencies used. If a minimal code, which does not rely on Cube, setting up clocks and TIM1, still won't work, post it.

I first noticed the alarm icon was not available in my control panel. I checked the settings and it's not available to add to the control panel. I've looked in the app library and used the search bar to locate the clock app (the default app) and the app is not available using either of those searches. I've restarted my phone and still no app. To clarify, the clock time shows up on my lock screen, but I can't find the default clock app that contains the alarm, timer, and stopwatch functions. I've had this phone (14 pro) for less than a month. The other thing I've noticed is that my background photo disappears and becomes a black background. I've restarted the phone twice now and both times cannot find the clock app and the background photo is the one I selected. Shortly after the restart the photo disappears to the black screen. Any thoughts or suggestions would be greatly appreciated?

Thanks for the info- I thought the app was a default and not one able to be downloaded. This thread states the clock app cannot be deleted on iOS 14 and later. However, I was able to access and restore the app via this link provided on another thread:

The clock drifts after few seconds as if some error in the clock is adding at every interrupt. at the timer configuration setting it shows /* Actual period: 0.01 seconds. Actual duty: 50%. */ so there is no timer count error. for testing I set up a stop watch to check the error after 2 minutes I was able to make out the error as the GPT clock starts to lag. after continuous operation the timer starts to lag and clearly the errors are in seconds. 2351a5e196