Thanks Ian,
i noted that even with Hydrabus, it is really using the SUMP protocol
for the LA part that interfaces with sigrok.
As sigrok is pretty new to me, i'm not too sure if there are other
protocols which pretty much covers both analog and digital channels.
one of those firmware like fx2lafw and the host/client side libsigrok
seem to such functionality but i've not delve into it much yet.
The attractive part about stm32 devices isn't so much that they are
'advanced', but they have quite a number of peripherals built into the SOC.
e.g. for stm32f103 the 'lower end' of the series, it has
http://www.st.com/en/microcontrollers/stm32f103cb.html
2 x 12 bits adc (1 msps each, can be interleaved to do 2 msps, multiple
of channels, for less samp per sec). but 12 bits is a good thing
Then it has on the soc dma (which allows better utilization of io
bandwidth, doing loops on a 72mhz mcu in flash ram won't be very fast,
dma relieves various bottlenecks).
it has several (2) sets of SPI, UART, I2C as peripherals.
USB 2.0 full speed is a built-in pheripheral in the soc
a rtc(real time clock) on soc
and the most of the various ports can be configured as gpios as a
'lowest common denominator'. the gpios hooked up to dma would work
pretty much as a digital signal recorder - logic analyzer, storing the
samples in sram on chip (but stm32f103cb has only got 20k)
because of the multitude of peripherals, an stm32 could work as a
multi-function device e.g. as both a LA or/and oscilloscope (not
necessarily concurrently, the higher end series probably can do just
that, lower end ones may run short of dma channels/streams).
the SPI, UART, I2C peripherals could in turn funnel data via USB to the
host, this works much like the FTDI usb-serial / other protocol dongles.
e.g. the hardware handles SPI, that becomes simply 2 stream of data -
MOSI and MISO and say if the SPI is hooked up to a LCD display (another
controller/mcu), these bytes could be funneled back to sigrok. And
sigrok would play a role more like a protocol analyzer e.g. displaying
what commands are send to the lcd and what comes back.
While in general the firmware would normally run on the mcu. i'd imagine
that we could have the firmware run in an emulator on the desktop the
data gets funneled between the emulator - via sigrok (middleman) - via
usb - sigrok firmware on mcu - LCD. this makes it a 'protocol analyzer'
in that sense.
the LCD commands and responses gets displayed in sigrok. this is pretty
round about but it may literally be useful in situations e.g. when
debugging firmware in the emulator on the pc.
Cheers,
Andrew
On 06/04/2018 02:49 AM, Ian wrote:
I have a bus pirate about to release with 16 million samples per
channel LA with a theoretical 100msps speed (but we'll be around
72msps). I'd be interested in doing whatever to get updated support
into the release as I'm developing a uni level text book that would
make use of sigrok.
The SUMP protocol is really insufficient for this, the sample counter
only goes to 0xFFFF so only a fraction of the sample space is available.
Please let me know if advance hardware would be helpful.
Cheers,
Ian, in Shenzhen, China
Sent from a mobile device, please excuse my brevity.
On Jun 4, 2018, at 00:39, andrew goh via sigrok-devel
<sigrok-devel@lists.sourceforge.net
<mailto:sigrok-devel@lists.sourceforge.net>> wrote:
Thanks Aleksander!
found some links:
https://hydrabus.com/hydrabus-1-0-specifications/
https://github.com/hydrabus/hydrabus
https://github.com/hydrabus/hydrafw
Hydrabus Board is actually based on stm32
On 06/04/2018 12:14 AM, Aleksander Alekseev wrote:
Hello Andrew,
Take a look on HydraBus project and corresponding firmware,
HydraFW. If I'm not mistaken it claims to be compatible with
BusPirate protocol. However last time I checked BusPirate support
in Sigrok was broken. Check the bug tracker.
As a side note assembled HydraBus is overpriced, better order PCB
on JLCPCB and solder it manualy. Or try to run HydraFW on some
development board from eBay.
Sorry I'm in an airport right now thus I can't give direct links.
On Sun., 3 Jun. 2018, 17:32 andrew goh via sigrok-devel, <
sigrok-devel@lists.sourceforge.net
<mailto:sigrok-devel@lists.sourceforge.net>> wrote:
hi all,
i'm a newbie, novice to sigrok, just hope to get some pointers.
there are many stm32 based development boards (e.g. the
discovery and
nucleo series from ST itself), and there are many others
which can be
purchased on ebay etc for a rather low cost. e.g. if one
search for
stm32f103 on ebay one could come across boards like blue pill
or maple
mini that goes as low as $2. these devices based on arm
cortex-m3 runs
at 72mhz has 2 adc which could push an envelop of about 2msps
sampling
speeds and gpios in the 10s of mhz. then the higher end
devices e.g. m4
stm32f407 runs at 168mhz has adcs that run up to 7msps and
gpio sampling
speeds faster than the m3 series and the larger ve-zg devices
has decent
amount of ram e.g. 64k-192k sram. and stm32 f3 series has adc
that can
push 18msps quad interleaved. hence despite a only an on
chip-full
speed usb 2.0, they can work as oscilloscopes or logic
analyzers by
storing the adc samples to ram and later transmit that over
usb. it
won't be those 100msps speeds but may be still useful for the
lower mhz
analysis
if i want to turn these boards to interface with sigrok /
pulseview etc.
where do i start looking for info?
are there any 'standard' sigrok protocols for oscilloscopes
and logic
analyzers where i can just build the firmware on the stm32
soc so that
they'd 'just work' without changes at sigrok end?
thanks in advance.
andrew
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