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Forum Index : Microcontroller and PC projects : CMM2 wave board wire-up to motherboard and ESP8266 Console.
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KeepIS Guru  Joined: 13/10/2014 Location: AustraliaPosts: 1882 |
I had a waveshare board test setup for a while and just finished soldering up a motherboard. Plugged the waveshare module in and - it worked, however there was a video problem. The colour scale had an abrupt jump about 60% through the brightness scale, mostly noticeable in the RED segment, checked the circuit and found I had accidently installed a 120 ohm instead of a 240 ohm in one leg of the RED channel. Interestingly, my lash up test wiring produced LESS horizontal instability than the board design layout. This instability is only noticeable with a graphic with a lot of vertical bars, something like TassyJims test screen pattern, and only on Mode 1. Mode 1,12 is the worst, and Mode 1,16 is slightly worse that Mode 1,8. I've designed RF boards and equipment, so when I lashed up the CMM2, I was careful with lead length and correct shielding and grounding. Anyway, it's normally not noticeable and still likely the monitor not handling it correctly, I'll get the old analogue storage CRO out and have a look when I get a chance. This bring me to the ESP8266. Having the USB to serial micro pluggable allows me to unplug the PIC16F1455 chip, plug two links into the empty USB-CON socket to allow for either plugging the ESP8266 into the USB port or into the ICSP header. In the photo you can see the test setup with ESP8266 plugged into the ICSP header. This ESP8266 thing is amazing, I don't know why I didn't get one years ago, it's connected to WI-FI on my home network and it's as fast on file upload / download as the USB to serial interface, and I'm running at 230400 baud. Sent a 280kb file back and forward and it never missed beat. I added TCP IP code to my windows MM-Series setup and configuration application and the speed of connection etc is impressive, I found that I had to add a keep-live timer to stop the link from dropping with periods of inactivity, must look into that later, might be a setting or something available as I've not had much time to read up on the EPS device, just enough to get it programmed and going.  I'm going to put this in a slightly larger case with a Power Bank, HDMI out and WiFi or USB console switch built in. Mike. NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
You can try different video cables. That can make a difference to the stability. If the instability becomes an issue, the ultimate fix is to replace the 8MHz crystal with a 8MHz oscillator module. That does make a big difference. I fitted mine dead bug style directly onto the Waveshare module but if you have the SC supplied board, there is provision for the oscillator on the motherboard. You still have to remove the crystal. Jim VK7JH MMedit |
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| KeepIS Guru Joined: 13/10/2014 Location: AustraliaPosts: 1882 |
Yes I saw the spot for the Xtal and cap, may have to look into it. I just finished looking at the Video signal on both a Digital scope and my old KIKUSUI Analogue digital storage scope, locked the Video to the H-Sync and had a good look at the staircase and video patterns, all look clean and stable, tried 3 different types of cable with no difference. Game modes are fine so it's not a real problem. Don't notice it in the editor etc on Mode 1,8. Mike. NANO Inverter: Full download - Only Hex Ver 8.1Ks |
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