About gregstm

gregstm · 2023-01-08

I'm waiting for a STM32L4 LQFP48 micro that also includes a DFSDM to become available, it's not urgent and I've got plenty of other things to do. But I have noticed there are a lot of QFN48 parts available. Maybe ST could make an adapter as described...

gregstm · 2022-09-27

Just in case others have missed this feature (like I did). You can generate DMA at 32768Hz and even 65536Hz rates with the LSE if you use the "TIM15 input capture 1 is connected to LSE" option and set the timer to "input capture" mode and capture one...

gregstm · 2022-09-01

If I'm interested in the availability of STM32L4 chips that come in a LQFP64 package and also has a DFSDM interface, I use the "View all STM32L4 series products" and select the appropriate filters. I then get a list of 17 different micro variations. ...

gregstm · 2022-06-09

Yes, I have tried contacting the local ST sales reps here in Australia - no response.Sorry, I've resisted asking this question for a fair while because I know many have greater need. But I thought I would ask this question just in case there is a sec...

gregstm · 2022-03-18

I'm using some extremely efficient 603 size Leds that are very bright even at 70 microamps current. Can I use the LCD Driver (eg. of the STM32L476, 8x40 driver ) to drive a modest 8x12 or 8x16 Led display? (I have created a little dot matrix display ...

gregstm · 2024-11-02

Use a simulator and step through your code at the assembly level, counting the cycles (there should a cycle count visible) - that way you will get to see the "overhead" of the loop. If you want to handcraft a loop with precise timing, you could consi...

gregstm · 2024-10-24

"... It's gone away for the moment ..." - never a good sign. Sympathies. I can't help you with your specific problem, but can make some general comments. I have had occasional trouble with Keil doing large integer calculations, I've had to break a la...

gregstm · 2024-09-15

When you play a 5KHz tone, the FFT indicates a 2.5KHz tone - out by a factor of two (if you feed it 6KHz do you get 3KHz?). It is probably some simple error that is producing the factor 2 error. Perhaps try feeding the FFT with a simple mathematicall...

gregstm · 2024-08-14

Not sure if these things will help, but here are things you could try (for your timing test):- make sure all your instructions are 32 bit wide (eg. use ldrb.w, eor.w add.w - not sure if you can force the "mul" command to be 32 bits wide, but you cou...

gregstm · 2024-07-26

When I generate table data, I tend to use an assembly language routine, not really for speed, just because I find it neater/easier to layout the data (I only use the routine to initialise an array at startup anyway). I just cut and paste it from the ...

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QFN48 to LQFP48 adapter thought

How did I miss this? 32KHz/64KHz DMA using LSE

Is there an easier way to search for micro availability (at distributors) based on peripheral requirements?

My kingdom for some samples! (STM32L4 + LQFP48 + DFSDM)

Can LCD Driver be used to drive ultra-low-power Led dot matrix display?

Re: Unexpected timing with nops

Re: Fragility of Keil printf() for doubles on Cortex-M0(+) platforms

Re: Perform fft on stm32f411

Re: Instruction Timings not matching ARM Cortex-M4 Manual

Re: Generating a sine wave using STM32G4