DAC driver for STM32 *almost* done

Post by **Giovanni** » Sat May 02, 2015 1:58 pm

Hi,

I finally merged the DAC driver code in 3.0, the driver has been modified in order to support the dual mode (but the dual mode is not yet complete). The timer code has been removed from the driver so it is much simpler, the triggering can be done with the GPT, PWM and ICU drivers, this opens to interesting combinations.

I also plan to add a simple API to write a value on the DAC manually when the driver is in "ready" state.

Those interested could give it a try and help with debug. So far there is a demo for the F4 only.

Giovanni

Post by **Giovanni** » Sun May 03, 2015 2:14 pm

Direct write and dual mode implemented, demo for dual mode added.

The driver needs testing, waiting for feedback

Giovanni

neums · Post by **neums** » Fri May 08, 2015 2:44 pm

Hello,
can you provide a running example project for the DAC driver?

Thanks. :-)

Post by **Giovanni** » Fri May 08, 2015 3:08 pm

Hi,

There are two demos under /testhal/STM32/STM32F4xx/DAC. The driver is still experimental, not much tested.

Giovanni

rew · Post by **rew** » Fri May 22, 2015 7:05 pm

Giovanni, Great work. I'm a short on time right now, but I'm looking forward to testing this!

Plan:
* First test on STM32F4.
* Then test on STM32F072.

Is it expected to work on '072, or are you aware of essential differences?

Post by **Giovanni** » Fri May 22, 2015 8:12 pm

It should work on all platforms but I tried on F3 and F4 only, let me know if there are difficulties.

It is derived by the contributed DAC driver but I decided to move the triggering outside the driver, there is no need to limit it to one timer.

Giovanni

erfan · Post by **erfan** » Sat May 30, 2015 4:35 pm

hi, I just tried DAC test. it was awesome. great work

can you tell me how to increase DAC frequency? Is there any documentation regarding DAC configuration? I want to generate 600KHz waveform.

Thanks,

rew · Post by **rew** » Sat May 30, 2015 4:45 pm

Ran into a small bug in the main chibios stuff. Whether it's related to the problems I'm seeing I don't know yet....

http://prive.bitwizard.nl/dma_redir_patch.diff

UPDATE: DAC seems to work on stm32F072....
I'm using the direct output function:

Code: Select all

    dacPutChannelX (&DACD1, 0, t);
    t += 300; 
    if (t > 0xfff) t -= 0x1000;

Post by **Giovanni** » Sat May 30, 2015 5:34 pm

erfan wrote:can you tell me how to increase DAC frequency? Is there any documentation regarding DAC configuration? I want to generate 600KHz waveform.

Hi,

You have to program the GPT, the DAC is synchronized with that.

Giovanni

Post by **Giovanni** » Sat May 30, 2015 5:35 pm

rew wrote:Ran into a small bug in the main chibios stuff. Whether it's related to the problems I'm seeing I don't know yet....

http://prive.bitwizard.nl/dma_redir_patch.diff

UPDATE: DAC seems to work on stm32F072....
I'm using the direct output function:
Code: Select all
    dacPutChannelX (&DACD1, 0, t);
    t += 300; 
    if (t > 0xfff) t -= 0x1000;

Hi,

That bug was in the new code, thanks for the patch, committed.

Giovanni

ChibiOS Free Embedded RTOS

DAC driver for STM32 almost done

DAC driver for STM32 almost done

Re: DAC driver for STM32 almost done

Re: DAC driver for STM32 almost done

Re: DAC driver for STM32 almost done

Re: DAC driver for STM32 almost done

Re: DAC driver for STM32 almost done

Re: DAC driver for STM32 almost done

Re: DAC driver for STM32 almost done

Re: DAC driver for STM32 almost done

Re: DAC driver for STM32 almost done