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Forum Index : Microcontroller and PC projects : uM2: PCB for 44-pin,40-pin TFT and USB
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| matherp Guru  Joined: 11/12/2012 Location: United KingdomPosts: 10406 |
I've now got loadable drivers for the SSD1963, SSD1289, and S6D0164 TFT displays running very quickly using the 44-pin uM2. Peter Carnegie has created SD card routines for the uM2, and I have demonstrated that these can co-exist happily. We have also seen that the PIC16F1455 provides an ideal USB interface for minimal cost. Given all this, I have designed a simple board that integrates all these components and brings out pins in an Arduino compatible format to allow easy expansion. I think this should be possible to fit into a PCB about 100 x 60mm The board is designed to be powered either by the USB cable or a DC input. This is link selectable for simplicity. The PIC16F1455 is always powered from the USB cable so will not reset with the uM2 or when the DC input is disconnected. This should make the USB connection much easier to manage. I'd appreciate any feedback on the concept and circuit design. 2015-08-20_121838_MM44.pdf |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 950 |
Hi Peter, your concept is very interesting! Isn't it a problem for the Micromite with your level-shifter with no power on the Micromite and 5V VBUS on the 16F1455??? - I think it would be better to use a second 3.3V regulator for the 16F1455 (powered by VBUS) without any level-shifters for TX and RX... ...see the attached picture by Chris Roper: 
Frank |
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| Chris Roper Senior Member  Joined: 19/05/2015 Location: South AfricaPosts: 280 |
On my own board I have taken it one step further from the drawing I posted by including a Jumper to switch between 5V and 3V3 operation. 3V3 is best when it is dedicated to the MicroMite but in my case it is part of a more generic board that can accept any DIP Packaged device and I wanted the ability to have it all USB powered. But I would definitely recommend the regulator with the Micromite and in that configuration you can use the PIC16LF1455 as well. Cheers Chris http://caroper.blogspot.com/ |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10406 |
Chris and Frank Thanks for the great input - I've made the change as you suggest changed version with a couple of minor bug fixes attached 2015-08-21_075154_MM44.pdf I'll start on the layout later today |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 950 |
Hi Peter, I think it is much better so. Frank |
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| JTR0701 Regular Member  Joined: 10/07/2013 Location: AustraliaPosts: 71 |
Might I very strongly suggest that you connect the unused pins of the 16F1455 to MCLR and the two ICSP of the PIC32MX. You never know where the possibilities might lead down the track. Remember, both devices are fully programmable and the connections can serve many purposes. For example, the DTR signal could be used as a device RESET and new firmware in the 1455 could provide a USB keyboard interface or a PIC32 programmer. I still have a 16F1455 in front of me that is both a USB-232 bridge and a programmer and I may (or may not) get around to finalizing something or someone else may step in. It seems a shame to be to not keep open the possibilities as to how functional this board may prove to be. |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 4071 |
What excellent ideas! John |
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| Chris Roper Senior Member Joined: 19/05/2015 Location: South AfricaPosts: 280 |
I would very much like to see that code and hex file if you are able to share. I was also thinking of extra things the 1455 could do but the Microchip USB code is so critical on timing that adding anything else tends to break it. In my case I was hoping to add a logic probe function and maybe other functions useful for a development board. Cheers Chris http://caroper.blogspot.com/ |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10406 |
Great ideas - thanks. I've wired up three 1455 pins to the ICSP port as suggested, I've also added a jumper to another port that can be read in software to allow the mode (programmer or VCP) to be set. Board size is 100mm x 62mm New schematic and first cut layout attached: 2015-08-22_082341_MM44.pdf 2015-08-22_082402_M44layout.pdf 
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MicroBlocks Guru Joined: 12/05/2012 Location: ThailandPosts: 2209 |
Looks fine. Some feedback i can give is that some of the islands for the resistors and capacitors will make it a bit difficult to solder the components as the traces connected to those islands are thick and will conduct heat away. This only valid when hand soldering. The islands i mean are the ones for R3, R11, R18, C1, C5, C10, C15 and C18 (maybe i missed one). Best practice is to keep the thick traces for the power traces but branch of a thinner trace to the island. Any particular reason to use a DIP for the 1455. a ssop is cheaper and i guess it makes routing The blue side) a bit easier and will allow for a better ground copper fill. Microblocks. Build with logic. |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10406 |
I haven't included a ICSP port for the 1455 so it needs programming separately. The DIP format allows it to be socketed during development so it can be removed/replaced. I've never had an issue soldering with 1oz copper but your point certainly sounds like good practice. Thanks for the feedback |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10406 |
One final version before I go to copper. 
I did some testing and the SSD1963 controller doesn't like it when D8-D15 are connected even though it is set to 8-bit mode. To solve this I have had to add shorting links to only connect D8-D15 when required to use the S6D0164 display. This controller doesn't mind when D0-D7 are made if it is in 8-bit mode. In addition, I have added a header to allow the board to also be used as a backpack for the ILI9143 and ILI9163 SPI displays. This has only increased the board width very slightly (from 61 to 67mm). This left a small amount of unused beard real-estate so I have used the extra space to add two additional I2C headers. The board is just slightly bigger than a 4.3" SSD1963 display and hidden completely behind a 5" or 7" display. 2015-08-23_181125_MM44.pdf 2015-08-23_181144_M44layout.pdf |
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| JTR0701 Regular Member Joined: 10/07/2013 Location: AustraliaPosts: 71 |
Hi Chris, At this time neither the code or I are ready for show time. Some things to be done and hard decisions that I cannot put off forever though I seem determined to try. I did mention the existence of this work here some time ago but the response was as such that I didn't feel I needed to give any priority to it... My code is written completely in assembler with my own stack and programmer design so I don't know anything about the timing issues with the microchip stack. A little surprised that you are finding it so finicky. Anyway I check in on this forum every few days so if there is any developments I can post and keep posted. Cheers for now. - Jim |
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| JTR0701 Regular Member Joined: 10/07/2013 Location: AustraliaPosts: 71 |
Yeah, smart thinking about including the extra signal. Of course, I thought of it myself but I didn't want to sound to pushy when it is not me having to layout the board. 
All round there really have been a big step ups in the work going on here since I first stumbled on this little corner of the web. |
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centrex Guru Joined: 13/11/2011 Location: AustraliaPosts: 320 |
Hi Matherp The PDF of the board layout a couple of posts ago does not appear to be the same as the picture you have shown. No extra I2C or 14pin header. Cliff Cliff |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10406 |
Ooops - latest version (checked this time  ) attached
2015-08-30_102505_backpack44.pdf 2015-08-30_102527_backpack44layout.pdf |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10406 |
Just received the PCBs. The picture shows one on the back of a 4.3" SSD1963 display. Now to build it up and test it. 
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2948 |
Nice looking board there matherp |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10406 |
Here it is populated - all works perfectly
Power is selectable between USB and external via the red link. There is separate regulation for the PIC16F1455 which provides the USB console interface (MCP1702-33) and the main 3.3V regulator (TC1264). The data pins and control pins to the display use the portC pins on the MX170 allowing very fast operation nearly equivalent to the MX470 (CLS takes 25msec on a 4.3" display) PWM control of the display backlight works perfectly using the onboard npn -transistor/Pchannel-mosfet combination. Changes for next version: Connect 5V pin on Arduino header when using USB power (currently only supplied when using external power Make holes for the heatsink leg bigger re-allocate pins on the PIC16F1455 to match TZ's default to allow the PIC32 to be programmed via the PIC16F1455 using pic32prog 
Latest compatible loadable driver for the SSD1963 is: sub mm.startup CPU 48 Display.Open(42,1,4.3) 'reset on pin 42, landscape, 4.3" display pwm 1,500,50 'set up the backlight end sub '**********Append this code and below onto the end of your MMBasic program*********** ' ' Author: Peter Mather 2015 ' ' Initialise the Display Driver for SSD1963 controlled TFT LCD Panel in 8-bit databus, 24-bit mode ' i.e. RGB888. This is optimised for the 44-pin uM2 and uses defined pinout except for the reset pin ' It achieves performance approaching that of the uM+ by heavily optimising bus I/O ' ' Display.Open initialises the loadable CFunction driver so that you can use all of the ' MMBasic graphic commands in your program. ' ' RST% is pin number of Reset signal ' Orient% PORTRAIT=0,RPORTRAIT=1,LANDSCAPE=2,RLANDSCAPE=3 ' Size% is display size in Inches eg 4 inch, 5 etc ' ' After Calling Display.Open, any of the usual MM Graphic commands may be used ' in your MMBasic program, eg BOX, TEXT, LINE, CIRCLE etc ' ' Note: you must use pins 25,26,27,36,37,38,2,3 for the data pins DB0-DB7 ' you must use pin 4 for RS and pin 5 for WR ' Tie CS Low and tie RD high ' ' Ver 1.02 2015-08-19 Initial Release ' '********************************************************************************** sub Display.Open(RST%,Orient%,Size!) as integer LOCAL DisplayMetrics%(2) LOCAL CFuncAddr% LOCAL Retrn% DisplayMetrics%(0)=Orient% DisplayMetrics%(1)=Size! DisplayMetrics%(2)=1 'sets the display type CFuncAddr%=PEEK(CFUNADDR SSD1963_V44) Retrn%=SSD1963_V44(CFuncAddr%,RST%,DisplayMetrics%()) END SUB ' File SSD1963_V44.bas written 15-Sep-2015 11:56:02 ' CFunction SSD1963_V44 0000001C 'write_command_data 27BDFFF8 AFA60010 AFA70014 27A20010 AFA20000 308400FF 34840200 3C02BF88 AC446230 24030200 AC436234 AC436238 18A0000D 8FA40000 00001821 24060200 24870004 AFA70000 80840000 34840300 AC446230 AC466234 AC466238 24630001 1465FFF7 8FA40000 03E00008 27BD0008 'main 27BDFF98 AFBF0064 AFB60060 AFB5005C AFB40058 AFB30054 AFB20050 AFB1004C AFB00048 0080A821 00A0B021 00C09821 24020019 AFA20028 2402001A AFA2002C 2402001B AFA20030 24020024 AFA20034 24020025 AFA20038 24020026 AFA2003C 24020002 AFA20040 24020003 AFA20044 27B20028 27B40048 3C109D00 8E510000 8E020010 02202021 24050008 0040F809 00003021 8E020010 02202021 24050065 0040F809 00003021 8E02001C 02202021 0040F809 24050005 26520004 5654FFF0 8E510000 3C109D00 8E020010 24040004 24050008 0040F809 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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2948 |
Very neat  |
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