Goertzel Board Demo for P2 Rev B
cgracey
Posts: 14,133
Here is something to try out your P2 Eval RevB with the accessory boards. (Note that I'm using a RevA board, but I have a RevB glob-top chip installed.)
This demo uses the Goertzel board to input finger movements above its square pattern, then it outputs a 256-sample persistent trail via HDMI at 640x480.
The Goertzel board connects to P40..P47, while the HDMI board connects to P8..P15. Those placements can be changed in the top few lines of the source file:
I think the Goertzel board's square pattern needs to be modified to be circular, since it couples unevenly and is very persnickety.
Here is a video of it operating and a picture of the setup:
This demo uses the Goertzel board to input finger movements above its square pattern, then it outputs a 256-sample persistent trail via HDMI at 640x480.
The Goertzel board connects to P40..P47, while the HDMI board connects to P8..P15. Those placements can be changed in the top few lines of the source file:
'********************************************
'* Use Goertzel board to drive HDMI board *
'********************************************
CON gtzl_base = 48 'must be a multiple of 8
hdmi_base = 8 'must be a multiple of 8
hdmi_color = %110 'rgb enables for luma8 mode (%000 = orange)
freq = 250_000_000.0 'system clock frequency must be 250 MHz for HDMI
buffer = $400 'sample buffer start (1 KB)
bitmap = $800 'bitmap buffer start (300 KB)
DAT org
hubset ##%1_000001_0000011000_1111_10_00 'config PLL, 20MHz/2*25*1 = 250MHz
waitx ##20_000_000 / 200 'allow crystal+PLL 5ms to stabilize
hubset ##%1_000001_0000011000_1111_10_11 'switch to PLL
setq ##($7FFFF - @end_of_pgm)/4 'clear hub RAM
wrlong #0,##@end_of_pgm
coginit #1,##@pgm_gtzl 'launch Goertzel
coginit #0,##@pgm_hdmi 'launch HDMI
'**************
'* Goertzel *
'**************
CON gtzl_freq = 1_200_000.0 'goertzel frequency is multiple of both 50 and 60 Hz
cycles = 1200 'number of cycles to measure
shifts = 12 'right-shifts for acc's
DAT org
pgm_gtzl wrpin adcmode,#gtzl_base+7 'init ADC pin
cogid x 'init DAC pins for this cog's DAC channels
setnib dacmode,x,#2
wrpin dacmode,#3<<6+gtzl_base
dirh #3<<6+gtzl_base
setxfrq xfreq 'set streamer NCO frequency
mov ptra,##buffer
rdfast #$100*2*2/64,ptra 'set rdfast to wrap of $100-sample circular buffer of (x,y) words
' Make sine and cosine tables in LUT bytes 3 and 2
mov z,#$1FF 'make 512-sample sin/cos table in LUT
sincos shl z,#32-9 'get angle into top 9 bits of z
qrotate #127,z 'rotate (127,0) by z
shr z,#32-9 'restore z
getqx x 'get x
getqy y 'get y
rolbyte y,x,#0 'make 0:0:y:x
rolword y,y,#0 'make y:x:y:x
wrlut y,z 'write sin:cos:sin:cos into LUT
djnf z,#sincos 'loop until 512 samples
' Take Goertzel measurements and plot in bitmap
loop xcont dds_d,dds_s 'issue Goertzel command
getxacc x 'get prior Goertzel acc's, cos first
mov y,0 '..then sin
cmpsub calwait,#1 wc 'initially calibrate
if_c mov xcal,x
if_c mov ycal,y
sub x,xcal 'get calibrated/shifted x
sar x,#shifts
sub y,ycal 'get calibrated/shifted y
sar y,#shifts
add x,#640/2 'constrain x to 0..639
fges x,#0
fles x,##640-1
add y,#480/2 'constrain y to 0..479
fges y,#0
fles y,#480-1
wrword x,ptra++ 'enter (x,y) into circular buffer
wrword y,ptra++
cmp ptra,##buffer+$400 wz
if_z mov ptra,##buffer
rflong z 'skip over new (x,y), so it gets plotted last
mov z,#0 'plot oldest to newest sample into bitmap, dark to light
plot rfword x 'get (x,y) sample from circular buffer
rfword y
mul y,##640 'get pixel address into y
add y,##bitmap + 640-1
sub y,x
wrbyte z,y 'plot pixel (z is the intensity 0..$FF)
incmod z,#$FF wc
if_nc jmp #plot
jmp #loop 'loop
' Data
adcmode long %0000_0000_000_100111_0000000_00_00000_0 'ADC mode
dacmode long %0000_0000_000_10110_00000000_01_00000_0 'DAC mode, cog DAC channels
xfreq long round(gtzl_freq/freq * 65536.0 * 32768.0) 'streamer frequency value
dds_d long %1111_1110_0000_1111<<16 + gtzl_base<<17 + cycles 'Goertzel mode, input from pin +4..7
dds_s long %0000_1000_000_000000000 'input from pin +3
calwait long 100 'initial calibration cycles
x res 1
y res 1
z res 1
xcal res 1
ycal res 1
'*********************************
'* HDMI 640 x 480 x 8bpp luma8 *
'*********************************
DAT org
pgm_hdmi setcmod #$100 'enable HDMI mode
drvl #7<<6 + hdmi_base 'enable HDMI pins
wrpin ##%001001<<8,#7<<6 + hdmi_base 'set 1 mA drive on HDMI pins
setxfrq ##$0CCCCCCC+1 'set streamer freq to 1/10th clk (25 MHz)
rdfast ##640*480/64,##bitmap 'set rdfast to wrap on 300KB bitmap
' Field loop
field mov hsync0,sync_000 'vsync off
mov hsync1,sync_001
callpa #10,#blank 'top blanks
mov i,#480 'set visible lines
line call #hsync 'do horizontal sync
xcont m_rf,#hdmi_color 'do visible line
djnz i,#line 'another line?
callpa #33,#blank 'bottom blanks
mov hsync0,sync_222 'vsync on
mov hsync1,sync_223
callpa #2,#blank 'vertical sync blanks
jmp #field 'loop
' Subroutines
blank call #hsync 'blank lines
xcont m_vi,hsync0
_ret_ djnz pa,#blank
hsync xcont m_bs,hsync0 'horizontal sync
xzero m_sn,hsync1
_ret_ xcont m_bv,hsync0
' Data
sync_000 long %1101010100_1101010100_1101010100_10 '
sync_001 long %1101010100_1101010100_0010101011_10 ' hsync
sync_222 long %0101010100_0101010100_0101010100_10 'vsync
sync_223 long %0101010100_0101010100_1010101011_10 'vsync + hsync
m_bs long $70810000 + hdmi_base<<17 + 16 'before sync
m_sn long $70810000 + hdmi_base<<17 + 96 'sync
m_bv long $70810000 + hdmi_base<<17 + 48 'before visible
m_vi long $70810000 + hdmi_base<<17 + 640 'visible
m_rf long $B0820000 + hdmi_base<<17 + 640 'visible rfbyte luma8
i res 1
hsync0 res 1
hsync1 res 1
end_of_pgm
I think the Goertzel board's square pattern needs to be modified to be circular, since it couples unevenly and is very persnickety.
Here is a video of it operating and a picture of the setup:
1152 x 2048 - 717K
Comments
Currently I have it connected to my monitor through a DVI connection. The monitor has a hard time syncing to the signal; random horizontal red lines, alternating vertical dark/red bars, and blank-then-resync.
Rogloh, when will you release your driver?
Here's my results:
* LG DVI monitor - Works, but red horizontal lines (random) and vertical alternating red/black bars plus sync problems (blanks, then reappears)
* Phillips HDTV - Just blank screen
* Vizio HTDT - Works pretty well; very rare horizontal red lines
I don't know if my numbers of pre- and post-visible blank lines are correct, either.
You should see just one little cyan squiggle that moves around with your finger.
It works when I uncomment that line. It seems 1mA is not enough to drive my monitor. When I run without that line my other DVI input stops working.
I changed the smartpin mode to "1.5 kohm" and now I can see the picture AND use my other DVI input at the same time...
and this: should be this:
I say it might not matter because I have these wrong in a code I posted (HDMI_Test1c) and it worked anyway...
It might also be that the current steering is too slow to change states much in 4ns. I was kind of surprised it worked. The resistive drive mode is much faster. We could also use the bit DAC mode.
Thanks. I changed the code in the top post to reflect this. I also changed 1mA drive to 1k-ohm drive.
Just changed hdmi base to 48 and gtzl base to 0.
It seems very sensitive, will probably take some training to control with precision...
It is very neat though.
We need more of a four-piece-annular-ring approach, instead of the big four-piece square.
It will be good for us to learn the best/safest setting to use for DVI/HDMI signalling levels. I had troubles with your earlier BIT DAC settings Chip and in my testing simply disabled this line below and ran directly at 3.3V, but I'm not sure that is advisable. I wonder what I should use in the driver? When I did some quick computation it seemed the current levels would be pretty low compared to what CML would normally drive but perhaps the differential signal swing is more important anyway.
I'd quite like to know what to put in the code I hope to release today...
' wrpin ##%10110_0011_0000_10_00000_0, a '123 ohm BITDAC for pins
Typed in from the PDF, which I will link below ----
Minimum differential voltage swings are 150mV
A TDMS signal generator with the ability to change amplitude is employed for this test. Any Sink-supported 27 MHz video format is generated that repeats the RGB gray ramp signals from 0 to 255 during each video period.
Testing starts from 170MV Vdiff on all pairs and the differential swing is reduced in steps of 20MV until the Sink device reports error. If the minimum Vdiff to which the Sink responds without error is < 150mV, the device has passed the test. The Test stops when minimum Vdiff reaches 70mV.
Another important element of this test is that it is performed at two different Vicm (common-mode voltage) settings, which are 3.0 and 3.3V. The CTS ask for the signal to be tested with a differential swing of 1.2V.
[later]
4. Differential Impedance
Differential transmission lines used in achieving fast data rates are very sensitive to impedance matching. Consequently, impedance characterization is a very crucial test in compliance testing of HDMI. The through-connection impedance has a limit of 15% variance to its 100 Ω specification. The impedance at termination needs to be tighter as the margins are only 10% of its characteristic value of 100 Ω.
This test is performed with the Sink device switched off. The measurement distance to DUT input connector is first measured. This is best determined using a TDR method where the impedance curve rises sharply to >200 ‰ denoting the distance to the connector.
Next, differential impedance values, ZDIFF, are determined for each pair from the input connector until the point where the impedance curve stabilizes to termination impedance. The other non-tested pairs are terminated to 50 Ω. ZDIFF values should fall within 85 Ω to 115 Ω for a device to pass the test.
https://download.tek.com/document/61W_17974_6_HR_Letter_0.pdf
Put the goertzel board on base pin 48 to match what the code is (the photo below shows the goertzel board on a different base pin)
You would have to create an array of input nodes to discern multiple fingers. It can be done.
That's good to know. Maybe that's why there's been some compatibility issues.