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Forum Index : Microcontroller and PC projects : olimex
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stanleyella Guru  Joined: 25/06/2022 Location: United KingdomPosts: 2455 |
power and no hdmi display. board led lit and pico heart beat flashing.It did work, I must have broke it. no hdmi out. was working fine. doh |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2455 |
it worked fine then got problems with usb to ttl. win says it's faulty/ this is why I use strip board, they all work consistently humph. I think I use the pico 2 with dunno..answers on a postcard to blue peter/bbc.co |
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| JanVolk Senior Member  Joined: 28/01/2023 Location: NetherlandsPosts: 230 |
Stanleyella, My board was badly soldered at the bottom and repaired. Running clear_flash can also help. You can also load the standard firmware and test with LEDs whether the HDMI pins on the Raspberry Pi print still work well on a breadboard. Greetings, Jan. |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2455 |
it was working, now no hdmi though pico reflashes and option list works. I think I broke it running it from usb to ttl for power mot using the usb power for olimex board. oh well Edited 2025-05-24 07:31 by stanleyella |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2455 |
I flashed on olimex > option list PicoMiteHDMI MMBasic RP2350A Edition V6.00.02RC24 OPTION AUTORUN ON OPTION FLASH SIZE 4194304 OPTION KEYBOARD UK OPTION RESOLUTION 640x480 @ 252000KHz OPTION DISPLAY 30, 53 OPTION HDMI PINS 1, 3, 7, 5 OPTION SDCARD GP22, GP6, GP7, GP4 OPTION AUDIO GP26,GP27', ON PWM CHANNEL 5 > it works hdmi display ok but usb version and usb to ttl and no input to mmcc so using above and mmcc win works via usb cable. mmcc connects but no keyboard response with usb firmware. all strange...if not broken etc. was fine till I messed with it. the version above no cpuspeed for hdmi. olimex reset don't work Edited 2025-05-25 05:02 by stanleyella |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7646 |
The Olimex board itself doesn't have all that much on it. Most of it is passive. Are you sure the Pico is ok? I think there's a program/run switch too. Check that. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| dddns Guru Joined: 20/09/2024 Location: GermanyPosts: 412 |
And measure the Vbus and Vsys voltage if its 5V |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7646 |
When you are using the switcher on the Pico there is a wide voltage tolerance. I've run a RP2040 quite happily from pair of partially used AA cells. :) I think 2V7 is the bottom limit. This doesn't apply to systems using any sort of linear regulator, where the input voltage has to be high enough to overcome the regulator drop-out voltage plus a bit for regulation. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| dddns Guru Joined: 20/09/2024 Location: GermanyPosts: 412 |
maybe the voltage regulation circuit has become defect while shortening.. |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2455 |
Mick and dddns, I can use > option list PicoMiteHDMI MMBasic RP2350A Edition V6.00.02RC24 OPTION FLASH SIZE 4194304 OPTION KEYBOARD UK OPTION RESOLUTION 640x480 @ 252000KHz OPTION HDMI PINS 1, 3, 7, 5 OPTION SDCARD GP22, GP6, GP7, GP4 OPTION AUDIO GP26,GP27', ON PWM CHANNEL 5 this works fine, plays wav from sd card. it's the usb hdmi I can't get working as it's strange characters when I type in win to mmcc. still this is ok as I don't use a kb or mouse. thinking trying usb to ttl to the pico sockets not the olimex board. mmcc works usb lead to pc. must say it's a neat board for a beginner with a tv. |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2482 |
That usually means the baud-rate is wrong. As USB versions use a USB / TTL converter, after a re-flash the Pico will default to 115200 baud. Make sure MMCC is also set to 115200 baud. You don't get this problem with the non-USB version as then it is a "virtual serial" link, there is no actual TTL being used so the baud-rate doesn't matter. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7646 |
I'll be honest, from what I've seen I'm not a lover of that Olimex board at all. Yes, it works (after a fashion) and it's fairly cheap, but that's where it ends. It's certainly not ideal for MMBasic. It would probably work out slightly cheaper to team up with four others and buy some of matherp's HDMIUSB Reference design boards. It's £13 + £3.90 carriage for the Olimex and about £20 each (fully assembled apart from the Pico) for the much nicer board, but that includes a proper audio filter, the USB hub and a RTC. It will also fit a standard enclosure if you don't want bits all over the bench. You still have to buy the Pico extra anyway. Of course, if you can solder a Pico to that board you could also build an even cheaper design as the soldering skills are the same. It starts to make the Olimex look expensive when you can buy 5 100mm x 100mm PCBs for about £4 including carriage. There's only the Adafruit (or similar) DVI breakout board extra, as those sockets are a bit of a pain to solder. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2455 |
strange as I got another pico2 usb hdmi but on vero and defaults to 115200. note it's v6,00.02b0 and I can't find the download. it has OPTION CPUSPEED (KHz) 315000 but that's not allowed with hdmi now and the same graphic program seems slower on olimex I had similar problems with usb keyboard and weird chars cos the kb always turned numlock on To show all toolbars, select 'Show full menus' in Setup menu Connected to COM3 at 115200 > option list PicoMiteHDMI MMBasic USB RP2350A Edition V6.00.02b0 OPTION SERIAL CONSOLE COM2,GP8,GP9 OPTION AUTORUN ON OPTION FLASH SIZE 4194304 OPTION COLOURCODE ON OPTION KEYBOARD UK, 0, 0, 600, 150 OPTION CPUSPEED (KHz) 315000 OPTION DISPLAY 30, 53 OPTION SDCARD GP22, GP6, GP7, GP4 OPTION AUDIO GP0,GP1', ON PWM CHANNEL 0 > |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2455 |
I'll order new usb to ttl boards... usb c ones my hdmi usb and vga usb boards are powered from the usb to ttl adapter no probs. Edited 2025-05-26 01:02 by stanleyella |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2455 |
Mick your right I guess but I'm as vero as you are pcb  as not used olimex I think I broke the usb to ttl by using it for powering olimex, forgot it needed own power point is a new user won't need a soldering iron. why don't I learn if it's not broke don't "fix" it?? Edited 2025-05-26 03:03 by stanleyella |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7646 |
Well, I've done you a vero design now. It even fits into a case. :) Try just plugging the USB-ttl adapter in by itself. Then check that (a) it's LED lights up and (b) there is 5V between its GND pin and 5V pin. There should also be 3,3V from the internal regulator on the 3V3 pin. If you aren't getting the voltages then look for a "large" SMD packege on the board. It will probably be marked 05 or something like that. It's a fuse. You should see 5V on both ends. If you don't then it's blown. It is possible to replace them but it's hardly worth it. I wouldn't recommend shorting it out as it protects the USB port of your computer... And I've managed to squish my Adafruuit-similar DVI breakout board down to the same size now. It's a bit different as pin 18 is fed via a diode so external devices won't try to power the Pico and pin 19 has a 10K pullup to +5 with a breakable link. Resistors are now 0603 size. There are two 5V pins, one at each end. I can get 15 to a 100x100 mm board now. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2455 |
Mick the 3.3v and 5v are not to be used but I've used them no prob so dunno. on vero I used a hdmi breakout with smd resistors. wiring vga not hard but hdmi. l8r same hdmi breakout?  Edited 2025-05-26 04:19 by stanleyella |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7646 |
You may not be using them but it will show if the chip is getting power and if its regulator is working (in which case it's unlikely to be faulty as it's on the same bit of silicon). The 3V3 output on these is pretty limited. You can't really do a lot with it. I recognised the Adafruit board. :) For VGA you connect 6 wires plus GND. For DVI/HDMI you connect 8 wires plus GND and 5V. It's hardly a big step. :) Neither connector is vero friendly. Incidentally, the fixing centres of the Adafruit board are the same as a D9 socket (or VGA). I did a design where the video socket is mounted upside-down on a little carrier board. That plugs into a row of male headers that go to the HSTX pins. The VGA and the HDMI both have their own resistors on board, so you can just swap the video module, change the firmware and you have a different machine! Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2455 |
Mick why all this when olimex so simple... on mmb when audio link explained. if just trying pico mmb first time want simple option, know what I mean? no soldering like arduino sorry but feel hardware shouldn't hold one back. I got some wavw share board I wish I never bought. never been mentioned on the forum since they were the rage you wouldn't fix a duff optimex, too tiny Edited 2025-05-26 05:02 by stanleyella |
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| dddns Guru Joined: 20/09/2024 Location: GermanyPosts: 412 |
I like this board more and more. They got some nice modules for UEXT tub connector e.g. this RTC But of cause it need to checked if it's pin compatible with PicoMite |
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