rpi-rgb-led-matrix
rpi-rgb-led-matrix copied to clipboard
hzeller
rpi-rgb-led-matrix with rpi computer module
hey there i'm using rpi computer module does any one test this library with rpi cm3 or it will work ?
Yes Can get 6 parallel chains using compute module Will soon put up the hardware on sale that I have developed for the Compute module
Now, support is there, provided by @arahasya in PR #1055
You have to enable the wide GPIO support in the lib/Makefile by removing the comment on the wide GPIO comment
DEFINES+=-DENABLE_WIDE_GPIO_COMPUTE_MODULE
There is no breakout board yet, you''ve to wire it up manually for now.
You find the mapping on the alternative hardware mappings paragraph: there is a fold-out table at the bottom ("GPIO-pins for each hardware mapping").
Or here:
| regular | adafruit-hat | adafruit-hat-pwm | regular-pi1 | classic | classic-pi1 | compute-module | |
|---|---|---|---|---|---|---|---|
| Parallel chains | 3 | 1 | 1 | 1 | 3 | 1 | 6 |
| ~OE | GPIO 18 | GPIO 4 | GPIO 18 | GPIO 18 | GPIO 27 | GPIO 0 | GPIO 18 |
| Clock | GPIO 17 | GPIO 17 | GPIO 17 | GPIO 17 | GPIO 11 | GPIO 1 | GPIO 16 |
| Strobe | GPIO 4 | GPIO 21 | GPIO 21 | GPIO 4 | GPIO 4 | GPIO 4 | GPIO 17 |
| A | GPIO 22 | GPIO 22 | GPIO 22 | GPIO 22 | GPIO 7 | GPIO 7 | GPIO 2 |
| B | GPIO 23 | GPIO 26 | GPIO 26 | GPIO 23 | GPIO 8 | GPIO 8 | GPIO 3 |
| C | GPIO 24 | GPIO 27 | GPIO 27 | GPIO 24 | GPIO 9 | GPIO 9 | GPIO 4 |
| D | GPIO 25 | GPIO 20 | GPIO 20 | GPIO 25 | GPIO 10 | GPIO 10 | GPIO 5 |
| E | GPIO 15 | GPIO 24 | GPIO 24 | GPIO 15 | - | - | GPIO 6 |
| Chain 1/R1 | GPIO 11 | GPIO 5 | GPIO 5 | GPIO 11 | GPIO 17 | GPIO 17 | GPIO 7 |
| Chain 1/G1 | GPIO 27 | GPIO 13 | GPIO 13 | GPIO 21 | GPIO 18 | GPIO 18 | GPIO 8 |
| Chain 1/B1 | GPIO 7 | GPIO 6 | GPIO 6 | GPIO 7 | GPIO 22 | GPIO 22 | GPIO 9 |
| Chain 1/R2 | GPIO 8 | GPIO 12 | GPIO 12 | GPIO 8 | GPIO 23 | GPIO 23 | GPIO 10 |
| Chain 1/G2 | GPIO 9 | GPIO 16 | GPIO 16 | GPIO 9 | GPIO 24 | GPIO 24 | GPIO 11 |
| Chain 1/B2 | GPIO 10 | GPIO 23 | GPIO 23 | GPIO 10 | GPIO 25 | GPIO 25 | GPIO 12 |
| Chain 2/R1 | GPIO 12 | - | - | - | GPIO 12 | - | GPIO 13 |
| Chain 2/G1 | GPIO 5 | - | - | - | GPIO 5 | - | GPIO 14 |
| Chain 2/B1 | GPIO 6 | - | - | - | GPIO 6 | - | GPIO 15 |
| Chain 2/R2 | GPIO 19 | - | - | - | GPIO 19 | - | GPIO 19 |
| Chain 2/G2 | GPIO 13 | - | - | - | GPIO 13 | - | GPIO 20 |
| Chain 2/B2 | GPIO 20 | - | - | - | GPIO 20 | - | GPIO 21 |
| Chain 3/R1 | GPIO 14 | - | - | - | GPIO 14 | - | GPIO 22 |
| Chain 3/G1 | GPIO 2 | - | - | - | GPIO 2 | - | GPIO 23 |
| Chain 3/B1 | GPIO 3 | - | - | - | GPIO 3 | - | GPIO 24 |
| Chain 3/R2 | GPIO 26 | - | - | - | GPIO 15 | - | GPIO 25 |
| Chain 3/G2 | GPIO 16 | - | - | - | GPIO 26 | - | GPIO 26 |
| Chain 3/B2 | GPIO 21 | - | - | - | GPIO 21 | - | GPIO 27 |
| Chain 4/R1 | - | - | - | - | - | - | GPIO 28 |
| Chain 4/G1 | - | - | - | - | - | - | GPIO 29 |
| Chain 4/B1 | - | - | - | - | - | - | GPIO 30 |
| Chain 4/R2 | - | - | - | - | - | - | GPIO 31 |
| Chain 4/G2 | - | - | - | - | - | - | GPIO 32 |
| Chain 4/B2 | - | - | - | - | - | - | GPIO 33 |
| Chain 5/R1 | - | - | - | - | - | - | GPIO 34 |
| Chain 5/G1 | - | - | - | - | - | - | GPIO 35 |
| Chain 5/B1 | - | - | - | - | - | - | GPIO 36 |
| Chain 5/R2 | - | - | - | - | - | - | GPIO 37 |
| Chain 5/G2 | - | - | - | - | - | - | GPIO 38 |
| Chain 5/B2 | - | - | - | - | - | - | GPIO 39 |
| Chain 6/R1 | - | - | - | - | - | - | GPIO 40 |
| Chain 6/G1 | - | - | - | - | - | - | GPIO 41 |
| Chain 6/B1 | - | - | - | - | - | - | GPIO 42 |
| Chain 6/R2 | - | - | - | - | - | - | GPIO 43 |
| Chain 6/G2 | - | - | - | - | - | - | GPIO 44 |
| Chain 6/B2 | - | - | - | - | - | - | GPIO 45 |
Finally received the active-6 PCB. Will populate soon. Need to slightly change the pin out from what is given above. Hopefully everything works out :) @hzeller
Hi @hzeller, Is there a reason for keeping GPIO0 and GPIO1 out of the hardware mapping with the CM3+ module? I would like to free up GPIO14 and GPIO15 as TXD0 and RXD0 if possible
Well it is technically possible to use GPIO 0 and GPIO 1 But I have used GPIO 31 for LAN_RESET which
But if you have a bulk requirement I can make that custom hardware for you.
Hi @hzeller, I did try to use your lib with rpi cm3 with 3 parallel chains and it work perfectly I wanna ask what do i have to add or change to have 6 parallel chains?
First, you have to enable the wide GPIO by enabling ENABLE_WIDE_GPIO_COMPUTE_MODULE in the Makefile. Remove the comment character in front of line 138 in lib/Makefile. And recompile.
Then, you can use the --led-gpio-mapping=compute-module flag to enable the compute module mappin.. In the fold-out table in the alternative hardware mappings section, you see the mapping of GPIO pins to LED panels (also see above in one of the comments: there is the table as well).
Then you can use --led-parallel=6 and use all chains. I have not been able to test that yet, but @arahasya has made a board and tested it I believe.
Hi Henner, I have realised I made a mistake in the active-6 board. I used the 3rd buffer line of OE CLK and LAT for the 3 extra chains. Should have buffered separately for each chain. Will rectify it.
Hi @arahasya, I made a post in the discourse forum about this topic, but I'd yet to come across this thread, where I've noticed you've developed an active 6 board already :)
Do you have a link to this board? Are you selling it? Curious to hear back from you as I am trying to develop (or potentially buy) the same thing 👌
Hi @arahasya, I have the same question : are you selling this board? Or willing to share the design? I'm too trying to connect 6 chains
