does dmx work on attiny chips

[chrisbooth1957]

i am trying to get the dmx to work using an attiny 84 ,,, there only appears to be the software option wicth is in itself not a problem but it default to ports not on the chip i am trying to use and they are greyed out so i am unable to use pins that are actuly on my chip

[Benj]

Hello,

The ATTINY84 device does not have a hardware UART, this is why it is not showing up in the channel property list for the DMX component.

I would advise a hardware UART for reliable communications so if possible I would choose a microcontroller with a hardware UART peripheral available.

DevHelper.jpg (67.42 KiB) Viewed 5961 times

I'll investigate why the pins are not becoming available to edit when in software mode.

[Benj]

I believe I have now fixed the problem where the software pins were not editable.

Simply copy the attached components into your "Flowcode 7/components" directory and restart Flowcode to load in the changes.

DMX512Slave.fcpx

(11.07 KiB) Downloaded 282 times

DMX512Master.fcpx

(11.01 KiB) Downloaded 263 times

Let us know how you get on.

[chrisbooth1957]

thank you that fixed it as you sugested looking at using the 2313 or 4313 as they have hardware

[chrisbooth1957]

i am not sure if i understand how the dmxslave should work . i am asuming it should wait and time out without a dmx signel if so it does not it just hanges there choice what times i set for the time out

second issue i am asuming a need to set the datachannes to 512 to recice all 512 channeles . when i do this it returnes them to 256 .. . i am using a atmega328 so has lots of ram but this appears to be a very waistfull way of doing this

what i am trying to do is control 4 relays using dmx and have the address set using 9 dip swicthes , i only need to recive 4 channels but i am unable to select the channes to recive using flowcode so i asume will need to recive the full 512 and then just read the 4 channes i need

[Benj]

Hello,

Please can you post your program and that will help me investigate the problems you are reporting.

[chrisbooth1957]

what i am trying to do is read the dip swicthes and then do something with the 9 bit dmx address (512) one problem is i can set the DMX slave to recive 512 channels it says the max is 512 but when i enter that is changes it to 256

it would be a lot better if i was able to change the dmx start address and number of channes recived in the main flowcode component macro as it is i will need to read the full 512 channes when i only need 3 as i dont know wicth 3 untill the dip swiches are read . it is normal to want to change the address of a fixture on the fly

i have tried changing the proccosor to a larger device as i dont think this one will have enough ram to read 512 channels and that does not fix the problem

not shown there but i have added some leds before and after the dmx call and it hanges waiting for the dmx to time out ) i remove the dmx call and the leds flash so the loop workes

not sure how difecult it would be to add the channes recived to the recive data chain macro ? that would make it a lot more usable , my sugestion would be start address and number of chanels then it would not matter that you appear to only be able to recive 256 channels as i have never come accross a fixture than needs more than 192 channels