I tested it on F2 (the same ADC as F4) with disabled DEBUGASSERT and it
looks fine.
You can try increasing the ADC_MAX_CHANNELS_NODMA value in stm32_adc.c and
see if it works as expected.
I think this assertion is only correct when we use an external trigger (eg.
TIM trigger). In the case of software triggering data overrun should not
occur.
Note that for F4, if DMA is disabled, ADC_CR1_SCAN bit is set to 0. This
means one trigger will start conversion on one channel.
For a similar effect on F3 we have to set ADC_CFGR1_DISCEN=1 and
ADC_CFGR1_DISCNUM=1, which is currently not supported.
wt., 15 gru 2020 o 11:52 Fotis Panagiotopoulos <f.j.pa...@gmail.com>
napisał(a):
> Hi,
>
> this is similar to what I want to achieve. However as I see, it is only
> supported on STM32F3's.
>
> On the F4's:
> static const uint8_t g_chanlist1[];
>
> must have a size of 1. Else an assertion fails. So I can only configure one
> pin.
>
> Is there any way to change this one pin to some other from my application?
>
> As I get it, throughout the whole lifetime of the firmware, from boot to
> shutdown, only one pin can ever be used, the one declared during the driver
> initialization. Correct?
>
>
>
> Στις Δευ, 14 Δεκ 2020 στις 9:05 μ.μ., ο/η raiden00pl <raiden0...@gmail.com
> >
> έγραψε:
>
> > Hi,
> >
> > I want to achieve the following sequence:
> > > 1. Select the desired pin.
> > > 2. Trigger a single conversion, and wait for it to finish.
> > > 3. Read the result.
> >
> >
> > This is not possible because the channel configuration cannot be changed
> at
> > runtime.
> > But you can achieve similar functionality just by disable DMA conversion
> > and use software triggers.
> > Then each software trigger will start conversion on the next pin in the
> > configured sequence.
> >
> > A simple example.
> >
> > You have a channel sequence set up like this:
> >
> > /* Identifying number of each ADC channel */
> > >
> > > static const uint8_t g_chanlist1[3] =
> > > {
> > > 9,
> > > 15,
> > > 8
> > > };
> >
> >
> > Then in the application you trigger the conversion (software trigger) and
> > read the data from a single channel:
> >
> > /* Start convertion on the first configured channel (ADC channel
> 9)
> > > */
> > >
> > > ret = ioctl(fd, ANIOC_TRIGGER, 0);
> > >
> > > /* Read data from the first convertion (channel 9) */
> > >
> > > nbytes = read(fd, sample, sizeof(struct adc_msg_s));
> > >
> > > /* Start convertion on the second configured channel (ADC channel
> > > 15) */
> > >
> > > ret = ioctl(fd, ANIOC_TRIGGER, 0);
> > >
> > > /* Read data from the second convertion (channel 15) */
> > >
> > > nbytes = read(fd, sample, sizeof(struct adc_msg_s));
> > >
> > > /* Start convertion on the third configured channel (ADC channel
> 8)
> > > */
> > >
> > > ret = ioctl(fd, ANIOC_TRIGGER, 0);
> > >
> > > /* Read data from the third convertion (channel 8) */
> > >
> > > nbytes = read(fd, sample, sizeof(struct adc_msg_s));
> > >
> > > /* The next trigger will start from the beginning (ADC channel 9)
> > */
> > >
> >
> >
> >
> > pon., 14 gru 2020 o 17:29 Fotis Panagiotopoulos <f.j.pa...@gmail.com>
> > napisał(a):
> >
> > > Hi,
> > >
> > > anyone on this?
> > >
> > > As I see, it is impossible to set multiple channels on STM32F4xx.
> > > To have multiple ADC channels configured for an STM32, it is required
> to
> > > have DMA enabled for the ADC, which seems not to be supported on
> STM32F4.
> > >
> > > Is that correct? So the F4s can use only one pin in ADC?
> > >
> > > Στις Πέμ, 10 Δεκ 2020 στις 4:04 μ.μ., ο/η Fotis Panagiotopoulos <
> > > f.j.pa...@gmail.com> έγραψε:
> > >
> > > > Hi everybody!
> > > >
> > > > I am trying to use the ADC on an STM32F427.
> > > > I am able to properly register the driver and access the ADC device.
> > > >
> > > > However, I am really confused on the proper use of the driver.
> > > > I have 8 ADC-capable pins on my board that I want to read.
> > > >
> > > > I want to achieve the following sequence:
> > > > 1. Select the desired pin.
> > > > 2. Trigger a single conversion, and wait for it to finish.
> > > > 3. Read the result.
> > > >
> > > > What is the correct way to achieve this?
> > > >
> > >
> >
>
