ChibiOS Free Embedded RTOS

Hi,

Is FPU handling enabled in the makefile? by default it is disabled.

Giovanni

FPU was set to "no".

The noise disappeared!! Thanks!!!

But one last question: should i use "softfp" or "hard" ?

The program is meant to handle a heavy load of floating point functions such as <math.h> sin ...

Ok, software tests have been made.

I added another sine wave generator modulating the amplitude of the first sine wave, this resulted in heavy latency.

I also made the orange LED turn on whenever the Half Transfer interrupt is fired and turn off when the Transfer Complete interrupt occurs.

The ...

Hi,

No clear idea, I thought it could be garbage picked up the DMA, you need to understand if the cause is SW, HW or measurement first.

Giovanni

Hi Giovanni,

I tested the program on another brand new STM32F4 Discovery Board and the problem still occurs, in my opinion it's not an hardware ...

Hi,

The HAL I2S driver is initialized like all others, clocks are enabled and DMAs allocated in the start function, I don't understand what you mean with non standard.

Giovanni

Hi, sorry

I just meant the driver is not initialized by calling the i2sStart() function, that configuration is passed ...

Hi,

Extending the buffer should be fine, it is zeroed by startup files so you don't even need to clear it.

Have you tried the I2S driver in HAL? I never tested it in that scenario.

Giovanni

Hi Giovanni, never tested I2S driver myself, given my unexperience i can barely understand what you are ...

Hi,

It looks like the DMA is reading beyond your buffer and outputting random data, could you try putting a zeroed zone after the I2S buffer? that would confirm that it is DMA-related.

Giovanni

Hi Giovanni, thanks for the interest towards my problem here.

As for now, it's quite difficult for ...

So i removed the functions you told me weren't supposed to be there, updated the repository (added the build folder with the .bin and .hex files) so you can check the thing out without building the whole project yourself.

I set the buffer size to 64 (to lower down the noise to a more clear audible ...

Not sure how often the I2C is involved, but could see some issues in that area:
1. You don't need to use chSysLock() and chSysUnlock() - in simplistic terms they're roughly equivalent to disabling interrupts.
2. i2cStart() is usually a one-time operation during initialisation (along with the pin ...

Hi all, i'm fresh new to this forum and relatively new to embedded programming (learning it by myself)

It's been a few months now that i'm stuck on a noise coming out of the jack plug whenever the STM32 Discovery Board is powered on and connected (via the audio jack) to my audio interface, even if ...