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4"Display
Posted: Sun Oct 04, 2020 9:16 am
by OE6EMF
Hi Colin! I have been using your software successfully for two months with the 6 "display in connection with a loudspeaker microphone and an HMC8038 6GHz RF switch from analog devices! But with the 4" display you should please help me. The display runs but the PTT does not work with the same configuration as the 6 "display. So i2c is activated in the Raspberry software and checked with sudo i2c detect - y 11! Ports on the display are also correctly plugged in. Unfortunately, the combination is missing. .. No ptt with pull resistor or relay voltage for hmc8038 on my pins. Maybe you can please help me with my problem! LG Thomas
Re: 4"Display
Posted: Sun Oct 04, 2020 11:13 am
by g4eml
Hello Thomas,
As you have found the normal Raspberry Pi GPIO cannot be used when using the Pimoroni Hyperpixel4 4" display.
You need to use an MCP23017 module attached to the Hyperpixel4 i2c port. wired up as detailed here
https://wiki.microwavers.org.uk/Langsto ... c_expander
The MCP23017 needs to be configured as device address 20 by grounding the A0, A1 and A2 pins. On some modules this is done by default, on others you may have to add jumpers.
You can check the device is recognised by using the command 'sudo i2cdetect -y 11'
You should see the following:-
Code: Select all
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- UU -- -- -- -- -- -- -- -- -- -- --
20: 20 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
Device 20 is the MCP23017 module.
Device 14 is the touch screen controller in the 4" display.
If device 20 is present on bus 11 then it will be automatically detected and used by the Langstone program. PTT input is on PA0, Key input is on PA1, Tx Output is on PA7, Band select bits are on PB0-7.
If you are seeing the device but it is still not working then let me know and I will try to help some more.
73 Colin G4EML
Re: 4"Display
Posted: Sun Oct 04, 2020 7:17 pm
by OE6EMF
Hi Colin! Thanks for the reminder!
Hardware configuration was still missing as you described! PTT and GHz switches work now perfectly!
LG Thomas OE6EMF
Re: 4"Display
Posted: Mon Oct 05, 2020 12:15 am
by g4eml
Glad you got it working.
I have added the extra instructions to the wiki.
73
Colin G4EML
Re: 4"Display
Posted: Wed Oct 07, 2020 7:26 pm
by OE6EMF
Hello Colin!
Very nice!
Thank you for your help!
Best regards, keep it up!
Thomas
Re: 4"Display
Posted: Sun Nov 08, 2020 9:39 pm
by OE6EMF
Soon!
73 de OE6EMF
Re: 4"Display
Posted: Sat Nov 14, 2020 8:49 pm
by OE6EMF
First pictures of the Langstone TRX backside!
73 de OE6EMF Thomas
Re: 4"Display
Posted: Wed Jan 20, 2021 5:59 pm
by OE6EMF
Good evening Colin for your information, the problem was with the display! Everything works perfectly with the new display, thank you!
Greetings from cold Austria!
Re: 4"Display
Posted: Sat Jan 23, 2021 9:36 pm
by OE6EMF
Now ready to use!
73!
Re: 4"Display
Posted: Sun Jan 24, 2021 9:04 am
by G4FKK
Very nice Thomas! Where did you get the panels made?
73, Martin - G4FKK