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Forum Index : Microcontroller and PC projects : Q: Possibility of WaveShare Pico-Eval-Board running MMBasic
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| andrewq Newbie  Joined: 18/10/2022 Location: AustraliaPosts: 7 |
Hello, very new guy here. I have very recently followed the development of the Micromite through to the most recent Picomite VGA reading up 2 years worth of backissue of Silicon Chip magazine. I have scrounged everything I can possibly find on the Web on this device and am quite excited. And hence, here I am :-) In the March 2022 issue, it describes a Raspberry Pico 3.5 LCD touchscreen Backpack that includes running an MMBasic demo. Ref Link It seems WaveShare has a Pico-Eval-Board (SKU: 20159) with a (somewhat) similar 3.5 LCD (LI9488/XPT2046).Product Link My question: Can MMBasic as demonstrated on the RPico Backpack (Silicon Chip, March 2022) also work on the Waveshare Pico-Eval-Board with no or little modification? Many thanks. Edited 2022-10-19 13:36 by andrewq |
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panky Guru  Joined: 02/10/2012 Location: AustraliaPosts: 1101 |
Andrew, MMBasic (the core interpreter) should run with a standard Paspberry Pi Pico RP2040 module plugged in, however the LCD, RTC, SD card etc. are on different pins than that of the Silicon Chip Backpack. You should sit down with the PicoMite User Manual (see https://www.geoffg.net/picomite.html ) and compare with the schematic and pinout of the Waveshare board. The PicoMite can have pins defined to different functions so you would need to carefully look at the PicoMite User Manual to see how to define the different configurations to match the Waveshare hardware. It may not be possible to fully utilise all the features of the Waveshare board but at least LCD and Touch should be 'do-able' - no guarantees as I do not have a Waveshare board to test. Doug. PS. Welcome to the forum. ... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it! |
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| circuit Senior Member  Joined: 10/01/2016 Location: United KingdomPosts: 245 |
This board; https://www.waveshare.com/pico-restouch-lcd-3.5.htm, works very well with Micromite. I have three working, touch, SD-card and screen all functioning. I imagine the board that you propose will also work; it seems simply to have a few more added devices. The board that I have linked to has appeared in a few posts on this forum. |
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| darthvader Regular Member  Joined: 31/01/2020 Location: FrancePosts: 76 |
I use this one , just use this options after you burn the firmware : OPTION RESET OPTION SYSTEM SPI GP10,GP11,GP12 OPTION SDCARD GP22, GP5, GP18, GP19 OPTION LCDPANEL ILI9488W, LANDSCAPE,GP8,GP15,GP9,GP13 OPTION TOUCH GP16,GP17 GUI CALIBRATE 0, 3946, 211, -1287, 853 Cheers. Theory is when we know everything but nothing work ... Practice is when everything work but no one know why ;) |
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| andrewq Newbie Joined: 18/10/2022 Location: AustraliaPosts: 7 |
Thank you all for the suggestions. I will definitely try out the pins and reading up a bit more. There is so much to catch up on. I am more a software guy, than hardware. The last project I did (i.e. realtime clock, assembly language reading via RS232, Intel386), was in the 1990s. Hard to believe how far we have come. I have only took notice of the CMM2 after reading a stack of Silicon Chip borrowed from the lib a week ago. I guess I have been missing out. Anyway, I went ahead and placed the order for a Picomite VGA kit, an LCDbackpack picomite kit, a CMM2 kit and a Waveshare LCD backpack. I got the kits from Silicon Chip site. Also, placed an order for the COREH7421 direct from Waveshare. This is about 3x the cost before the chip shortage, but still do-able without the wife protesting. I will be headed to Jaycar next to get a good SMD soldering kit and accessories. My greatest concern, unbelievably, is not being able to put the kit together due to bad eyesight and shaky hands. I will report back once I get going with the kits. I will definitely have more questions, and hopefully something useful to share in return. Edited 2022-10-21 15:33 by andrewq |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
It sounds like you'll be having fun...  The CMM2 has been like rocking horse poo for some time now. The silicon got swapped for unobtainium. :( The PicoMite VGA is highly recommended though, if not as powerful. I'd recommend that you get one of the little cheap SMD soldering practice kits from ebay or AliExpress. They are very good for testing your skills and giving you some practice before putting "real" components at risk. Welcome to the forum! :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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Rickard5 Guru Joined: 31/03/2022 Location: United StatesPosts: 463 |
I really Love mine, for the $-Easy Ratio you just can't beat it but one thing I did when I put pins on the Pico that goes in the waveshare if you look I only put the used pins pins pointing down in to the LCD and the unused pins Pins pointing up, it's easiest to do this if you use a breadboard as a jig when soldering the pins in place   I may be Vulgar, but , while I'm poor, I'm Industrious, Honest, and trustworthy! I Know my Place |
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NPHighview Senior Member Joined: 02/09/2020 Location: United StatesPosts: 200 |
Andrew - I've been playing with the WaveShare Pico-Eval-Board quite a bit recently, using a PicoW and the spectacular new firmware. Here is an analog clock program that uses NTP to get the time (correct it for your timezone), uses the on-board speaker to "tick" every second, automatically dims or brightens the display with ambient light, and shows a random color on the built-in NeoPixel every second. Enjoy! Rem Analog LCD Clock using  WaveShare 3.5" Pico-Eval-Board ("P-E-B") Rem May 12, 2023  S.F. Johnson Rem Uses features of the Waveshare P-E-B including Rem   Display Brightness based on LDR Light Dependent Resistor on GP26 Rem   Tick sound using On-board Speaker. . . . . . . . . . . . on GP14 Rem   Color-changing LED using On-board NeoPixel . . . . . . . on GP4 Rem Depends on LCD in "Rotated" Portrait mode: Rem   OPTION LCDPANEL ILI9488W, RPORTRAIT,GP8,GP15,GP9,GP13 Rem Depends on being initialized with the local WiFi, or Date$ and Time$ Rem being set manually (which will not survive a reset cycle) Const Bright% = &H0F     ' Control the brightness of the NeoPixel Const Back  = RGB(BLACK)  ' Color of Background Const Fore  = RGB(WHITE)  ' Color of Foreground / Tic Marks Const Textc  = RGB(LightGray) ' Color of text on LCD display Const HCtr  = MM.HRes/2   ' Horizontal center of LCD display & clock Const VCtr  = MM.VRes/2   ' Vertical center of LCD display and clock Const x    = HCtr     ' Shorthand for horizontal center Const y    = VCtr     ' Shorthand for vertical center Const Smajor = 3       ' Width of Seconds divisible by 5 Const Sminor = 3       ' Width of Seconds not divisible by 5 Const Smajc  = Fore     ' Color of Major tic marks Const Sminc  = Back     ' Color of Minor tic marks Const Souter = Int(Min(x-1, y-1)) ' Outer Dia. of Clock Face Const Sc   = RGB(RED)   ' Color of Second Hand Const Sinner = Souter-28   ' Inner Dia. of Tics divisible by 5 Const Smid  = Souter-14   ' Inner Dia. of Tics not divisible by 5 Const Mw   = 3       ' Width of Minute Hand Const Mc   = RGB(CYAN)   ' Color of Minute Hand Const Minner = 0       ' Inner Dia. of Minute Hand Const Mouter = Sinner-5   ' Outer Dia. of Minute Hand Const Hw   = 5       ' Width of Hour Hand Const Hc   = RGB(CYAN)   ' Color of Hour Hand Const Hinner = 0       ' Inner DIa. of Hour Hand Const Houter = Mouter-40   ' Outer Dia. of Hour Hand Option BASE 0 Colour Back, Fore      ' Set default colors Font 1, 3          ' Set default font Dim C% As INTEGER      ' Create value for NeoPixel SetPin GP4,  DOUT      ' NeoPixel connected to GPIO 4 - bitbang it SetPin GP14, DOUT      ' Beeper / Buzzer connected to GP14. PWM it SetPin GP26, AIN       ' Light-Dependent Resistor (LDR) on GP26 On Error Skip WEB ntp -7          ' Pick up time for Pacific time - change for locale CLS Back           ' Clear the LCD screen Hrs$ = Mid$(Time$,1,2) : Min$ = Mid$(Time$,4,2) : Sec$ = Mid$(Time$,7,2) OldHrs$  = Hrs$ : OldMin$  = Min$ : OldSec$  = Sec$ DrawClockFace : UpdateHands : UpdateText Backlight 50 SYNC 1000000 Do  SYNC  Hrs$ = Mid$(Time$,1,2) : Min$ = Mid$(Time$,4,2) : Sec$ = Mid$(Time$,7,2)  UpdateClick : UpdateSecond : UpdateLDR  If OldMin$ <> Min$ Then UpdateText : UpdateHands  If OldHour$ <> Hrs$ Then   On Error Skip   WEB ntp -7     ' Re-synch every hour  End If  OldHour$ = Hrs$ : OldMin$ = Min$ : OldSec$ = Sec$ Loop CLS Option HEARTBEAT ON Sub UpdateText  Local String DateString$  H12 = Val(Hrs$) Mod 12 : H24 = Val(Hrs$)  ' Prep for AM/PM test  If H12=H24 Then   Text x, 20, "  "+ Str$(H12) +":"+Mid$(Time$,4,2)+" AM  ", "CM", 3, 1, Textc, Back  Else   Text x, 20, "  "+ Str$(H12) +":"+Mid$(Time$,4,2)+" PM  ", "CM", 3, 1, Textc, Back  EndIf  DateString$ = " "+Day$(NOW)+" "+Right$(Date$,4)+"-"+Mid$(Date$,4,2)+"-"+Left$(Date$,2) + " "  Text x, MM.VRes-20, DateString$, "CM", 3, 1, Textc, Back End Sub Sub UpdateLDR ' ambient light detector  Local Float LDRVal  Local Integer BLight  Local String LDRStr$, BRTStr$  LDRVal = Pin(GP26)  BLight = Int(Min(50+15*LDRVal, 100))  Backlight BLight End Sub Sub UpdateHands ' Adjust position for hours, minutes  Circle x, y, Mouter+1, 1, 1, Back, Back ' Clear the inner face  H = 30*(Val(Hrs$) Mod 12) + Val(Min$)/2 ' Hour hand interpolates  a1 = H - Hw : a2 = H + Hw  Arc x, y, Hinner, Houter, a1, a2, Hc  M = Int(MinsToDeg(Val(Min$)))      ' Minute hand doesn't interpolate  a1 = M - Mw : a2 = M + Mw  Arc x, y, Minner, Mouter, a1, a2, Mc  Circle x, y, 4, ,,HC, HC         ' Dot at the center End Sub Sub UpdateClick  C%=RGB(Int(Bright%*Rnd),Int(Bright%*Rnd),Int(Bright%*Rnd))  Bitbang ws2812 o, GP4, 1, C% ' Set the NeoPixel to a random color  Pin(GP14) = 1 - Pin(GP14)   ' Toggle the buzzer to make a "Tick" sound End Sub Sub UpdateSecond  ' Erase old second position  S = Int(SecsToDeg(Val(OldSec$)))  If S Mod 30 = 0 Then   a1 = S-Smajor : a2 = S+Smajor   If S = 0 Then    Arc x, y, Sinner, Souter, a1, a2, RGB(Yellow)   Else    Arc x, y, Sinner, Souter, a1, a2, Smajc   EndIf  Else   a1 = S-Sminor : a2 = S+Sminor   Arc x, y, Smid, Souter, a1, a2, Sminc  EndIf  ' Draw new second position  S = Int(SecsToDeg(Val(Sec$)))  If S Mod 30 = 0 Then   a1 = S - Smajor : a2 = S + Smajor   If S = 0 Then    Arc x, y, Sinner, Souter, a1, a2, RGB(Yellow)   Else    Arc x, y, Sinner, Souter, a1, a2, Smajc   EndIf   Arc x, y, Sinner, Souter, a1, a2, Sc  Else   a1 = S - Sminor : a2 = S + Sminor   Arc x, y, Smid, Souter, a1, a2, Sc  EndIf End Sub Function HrsToDeg(hrs%) As Float  HrsToDeg = 30*(hrs% Mod 12) End Function Function MinsToDeg(mins%) As Float  MinsToDeg = 6*mins% End Function Function SecsToDeg(secs%) As Float  SecsToDeg = 6*secs% End Function Sub DrawClockFace  For m = 0 To 354 Step 6  ' 360 degrees / 60 minutes >= 6   If m Mod 30 = 0 Then   ' Major tic mark    a1 = m - Smajor : a2 = m + Smajor    If m = 0 Then     Arc x, y, Sinner, Souter, a1, a2, RGB(Yellow)    Else     Arc x, y, Sinner, Souter, a1, a2, Smajc    EndIf   Else           ' Minor tic mark    a1 = m - Sminor : a2 = m + Sminor    Arc x, y, Smid, Souter, a1, a2, Sminc   EndIf  Next m End Sub Edited 2023-05-14 09:35 by NPHighview Live in the Future. It's Just Starting Now! |
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| NPHighview Senior Member Joined: 02/09/2020 Location: United StatesPosts: 200 |
Hmmm - an interesting difference between the Pico and PicoW firmware, or my initialization for the WaveShare Pico-Eval-Board (P-E-B). Any thoughts? I have a Pico and a PicoW, and have two of the P-E-Bs. * The Pico will initialize, calibrate, and use the WaveShare touch capabilities just fine on both P-E-B assemblies. * The PicoW, though it uses most of the other peripherals just fine, fails to initialize the touch circuitry correctly on both. When I run GUI TEST TOUCH, the LCD display goes white, targets are *not* displayed, and it doesn't respond to me touching the screen. I have to exit the test with a Ctrl-C, which returns control to the terminal session, but does not clear the screen. Subsequent program execution (of the clock code, above) runs normally, not requiring a restart. Here is my OPTION LIST for the Pico (which works with the P-E-B touch, in either Portrait or Landscape mode): OPTION SYSTEM SPI GP10,GP11,GP12 OPTION COLOURCODE ON OPTION POWER PWM ON OPTION CPUSPEED (KHz) 200000 OPTION LCDPANEL ILI9488W, RLANDSCAPE,GP8,GP15,GP9,GP13 OPTION GUI CONTROLS 26 OPTION TOUCH GP16,GP17 GUI CALIBRATE 0, 237, 3908, 1259, -865 OPTION SDCARD GP22, GP5, GP18, GP19 Here is my OPTION LIST for the PicoW (which doesn't work in either Portrait or Landscape): [OPTION SYSTEM SPI GP10,GP11,GP12 OPTION COLOURCODE ON OPTION POWER PWM ON OPTION AUTORUN 4 OPTION HEARTBEAT OFF OPTION CPUSPEED (KHz) 200000 OPTION LCDPANEL ILI9488W, RPORTRAIT,GP8,GP15,GP9,GP13 OPTION DISPLAY 50, 132 OPTION WIFI MelodyGarden, ******** OPTION TOUCH GP16,GP17 GUI CALIBRATE 0, 3946, 211, -1287, 853 OPTION SDCARD GP22, GP5, GP18, GP19 and other info about the PicoW: Program:  6K ( 6%) Program (187 lines)  74K (94%) Free Saved Variables:  16K (100%) Free RAM:  6K ( 5%) 51 Variables  0K ( 0%) General 100K (95%) Free I found this when trying to enhance my analog clock program, above. Edited 2023-05-16 09:46 by NPHighview Live in the Future. It's Just Starting Now! |
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| NPHighview Senior Member Joined: 02/09/2020 Location: United StatesPosts: 200 |
Some new information: Just for the heck of it, on the PicoW, I tried swapping the Chip Select and IRQ line declarations in the OPTION TOUCH command (i.e. OPTION TOUCH GP17, GP16) instead of the way that it looks like it should be from the schematic on the WaveShare site (i.e. OPTION TOUCH GP16, GP17, which works on the Pico). Running GUI TEST TOUCH command results in a Error: Touch not calibrated error message. This time, when I do a GUI CALIBRATE command, the LCD goes black, the first target is displayed in the upper left corner, and the text "Touch Target and Hold" is displayed. However, touching does nothing. I can terminate the calibration process with a Ctrl-C keypress. As I mentioned above, all works well with the non-W Pico. Live in the Future. It's Just Starting Now! |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9129 |
Out of interest please try this WebMite.zip |
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| NPHighview Senior Member Joined: 02/09/2020 Location: United StatesPosts: 200 |
Thank you, Peter - Progress. The new firmware installed painlessly (i.e. didn't erase settings or flash - nice!). I swapped TP-IRQ and TP-CS back ("OPTION TOUCH GP16,GP17"), then ran GUI CALIBRATE. This time, all four targets appeared in succession, and I got the response: Done. No errors Deviation X = 2, Y = -5 (pixels) Running GUI TEST TOUCH, however, shows a white screen, no response to touch, but terminated without complaint when I pressed the spacebar on the keyboard. Despite this, touch works just fine in simple code: CLS Do If Touch(x)<>-1 Then Pixel Touch(x),Touch(y),RGB(255*Rnd,255*Rnd,255*Rnd) Loop If you don't already have one, I'd be honored if I could purchase a WaveShare P-E-B for you. Live in the Future. It's Just Starting Now! |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9129 |
One more try - don't understand why the Pico-W is so sensitive on that particular board - power supply or something? WebMiteV5.07.07.zip Edited 2023-05-18 03:12 by matherp |
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| NPHighview Senior Member Joined: 02/09/2020 Location: United StatesPosts: 200 |
No joy - same behavior as above. That would be my guess, too. I'll get my DVM and report VBUS and VSYS voltages after doing a round of errands. Thank you! - Steve Live in the Future. It's Just Starting Now! |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
Ah, it's one of those systems that uses shift registers to simulate SPI with a parallel display, isn't it? Nasty. Looks like a standard Touch chip though. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| NPHighview Senior Member Joined: 02/09/2020 Location: United StatesPosts: 200 |
OK - I've had a chance to measure voltages under various conditions with Peter's 2023-05-18 03:12 interim software on the PicoW; I don't see anything obvious, except that my Analog Clock program is a heavy load.  I've ordered another PicoW to see if it behaves the same. - Steve Live in the Future. It's Just Starting Now! |
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| NPHighview Senior Member Joined: 02/09/2020 Location: United StatesPosts: 200 |
Peter - Thanks for the test software iteration. I dug up my USB tester accessory, and re-compared the PicoW (with 2023-05-17 test firmware) and Pico (with 5.07.07 release firmware). Current draw is consistently higher on the PicoW (the WiFi chip, I'm sure), but still well within the 2A limit for pin 36. I've ordered another PicoW to see how it performs. The huge current draw from earlier was caused by me toggling GP14 once every second, which left the NPN transistor drawing current through the buzzer with no current limiting resistor. I've changed that to only pulse it for a fraction of a second, enough to hear, but not enough to strain it as much as before.   Live in the Future. It's Just Starting Now! |
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