[OZAPRS] IO PCB audio pTT etc
Glen English VK1XX
glenlist at pacificmedia.com.au
Wed Jan 31 08:00:09 AEDT 2018
Hi Matt
I'll update the makefile to deal with the A17
or you can...
have a look in the make file, you'll see the options for the different
cores and their flags
-mcpu=cortex-a17 -mfpu=neon-vfpv4
cortex a17 has the full vfpv4 (32 registers instead of the 16 VFPV4-D16
that rhe A5 has)
vfpv4 is soooo much faster than vfpv3.....
I migrated out of AVRs about 5 years ago. all STM32 now for me but
ATTINY 8 pin DIL still a useful beast in a few situations.
On 30/01/2018 10:03 PM, Matthew Cook wrote:
> All Good ! I'm running on a Asus Tinkerboard with an Rockchip RK3288
> (ARM Cortex-A17) which is no slouch and has onboard audio (in and out!)
>
> I like having the four serial ports at my disposal (*grin*).
>
> I've run out of Pi3's and won't be ordering any more.
>
> I'm amazed that more of these boards don't have some form of LVD and
> shutdown inbuild into kernel, it's not that hard.
>
> I should be able to do same with the Tinker as you do with Odroid.
>
> I'm thinking of putting one of these in a solar site with 25W HF
> transceiver in the country, hence needing to have LVD. I could do
> same with a ATtiny84 or ATtiny1634 (<<- current favourite AVR)
>
> 73
>
> Matt
> VK5ZM
>
>
> On 30 January 2018 at 20:54, Glen English VK1XX
> <glenlist at pacificmedia.com.au <mailto:glenlist at pacificmedia.com.au>>
> wrote:
>
> Hi Matt
>
> Note for PIs, only PI3 will run the decoder decently. any sh1t
> will run the encoder.
>
> How fast can you get the PI off if an interrupt via GPIO comes in ?
>
> In ODROID we have a root process sitting on the IRQ. a shellscript
> shutdown is generated within a time slice or so....
>
> I have a TINY-13 DIL8 atmel on the board to program up to do
> challenge duties for the host. send a pulse, get one back etc
> within 3 seconds etc etc or pull power, and also it has a analog
> pin for looking at the input volts and starting a shutdown on
> another gpio pin.
>
> just need to have enough energy on board to keep the computer up
> for just long enough to complete a shutdown, in reality probably
> only needs to SYNC and UNMOUNT etc then die. if user files are
> left hanging the FS will deal with that next boot.
> the ups function adds quite a bit to the board, doign it proper.y.
> I'll have a think about it otherwise I'll just provide an opto
> input to accept a closure which will trigger the fast shutdown.
>
> Actually there are a few Raspbian crash-shutdown type SD card
> flavors (apart from just booting with the system partitions RO and
> using a USB key for /tmp log and application data.)
>
> this is how I do it
>
> send SIGTERM to the guzzling application
>
> ps kill etc
>
> #sync fs
> echo s > /proc/sysrq-trigger
>
> #remount in RO
> echo u > /proc/sysrq-trigger
>
> echo 1 > /proc/sys/kernel/sysrq or sysctl -w kernel.sysrq=1
>
> echo o > /proc/sysrq-trigger
>
> or really quick and dirty
>
> shutdown -F -h -n now
>
>
>
> On 30/01/2018 5:04 PM, Matthew Cook wrote:
>
> Glen,
>
> I'd also suggest the following;
>
> * pull the TX/RX of the FT230 into a RS232 driver to allow
> radio control
> * Have some form of H/W monostable watchdog for the Pi (mostly
> likely dump power)
> * It would also be a good idea to have some form of UPS function
> where it shutsdown the Pi or disables the radio (relay?)
> when the
> supply volts are 10.5V or less (programmable ?)
>
> 73
>
> Matt
> VK5ZM
>
> On 30 January 2018 at 15:36, Glen English VK1XX
> <glenlist at pacificmedia.com.au
> <mailto:glenlist at pacificmedia.com.au>
> <mailto:glenlist at pacificmedia.com.au
> <mailto:glenlist at pacificmedia.com.au>>> wrote:
>
> Today I have done a schematic for a board to plug into
> either Pi
> or Odroid, OR any platform with a USB for the usual
> requirements-
> audio I/O , PTT, a uart and some spare pins for GPSPPS etc
>
> Before I finalize it, are there any requests ?
>
> Currently :
>
> 40 pin header for direct connection of IO to Odroid or RPi for
> GPS/UART/PTT/RX mute / IO
>
> On board USB audio device (PCM2903) for TX/RX audio (two
> channels
> so can suit IQ radio)
>
> On board USB UART (FT230) for generating RTS for
> generating PTT,
> and gives you a 3.3V serial port
>
> On board 8-30V in to 5V DCDC converter. quiet.
>
> HW watchdog on PTT
>
> Some IO for ? (2 x analog in, 2 x uart 1 x I2C)
>
> should be buildable for $30 or less. all easy SMT sizes.
>
> the idea is you can plug USB audio , USB uart for any
> platform,
> or you can use the built in expansion header IO for PTT
> etc direct
> on a suitable board. IE good for PC or good for Odroid/PI.
>
> green pluggable header for radio interface.
>
>
>
>
>
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