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Forum Index : Microcontroller and PC projects : Getting Started with SnadPic
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| Phil23 Guru  Joined: 27/03/2016 Location: AustraliaPosts: 1664 |
Hi all, Continuing from my long winded post about the SnadPic, the screen and the fact that I ordered one with an 8Meg crystal, changed the crystal, waited 5 weeks for the programmer to arrive, etc, etc. I've finally got to the point where I've added a pin header & tried to program it. Software Detected the Pic as being present & programed it successfully. What next? Should the on-board USB port be automatically able to connect to MMbasic? OR do I need to connect an external USB interface like a CP2102 to it. At the moment it doesn't do anything when I plug it into the USB port; as in no com port appears in device manager. I'm assuming the crystal is working Ok, but is there a way I can verify that by looking for a waveform somewhere? Thanks Phil. |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3662 |
Well, what exact software did you flash in? Probably there's no USB support. Check voltage levels of any CP2102-type device but also you can figure the uart pins from the MMBasic manual as I recall. John |
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| Phil23 Guru Joined: 27/03/2016 Location: AustraliaPosts: 1664 |
Flashed it with MMbasic 5.1. Actually have a 2nd one here that I ordered with the correct crystal on it & I can see the 20Meg crystal running on the scope, which is not the case with the original one that I changed the crystal on. It still has the 32k Crystal installed & I can see it running. Might need to check the board again. Someone else mentioned in the previous post I made that a few caps might need changing too. Not sure if I'm actually seeing a very weak signal at the chip or not on the first one; bit rugged working in the lounge room to be 100$ sure. The 2nd one definitely has a very strong signal from the rock though. Appears in device manager though as two devices, 
Not a Com port, but then it only is loaded with the supplied bootloader. Have not flashed it yet. Phil. |
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palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1804 |
You probably need the Silicon Chip driver for the USB port. Paul. Edit.... Just checked my SnadPic shows up in Device Manager as Silicon Chip Serial Port. The Driver is available on Geoff's web site. Paul "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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plover Guru Joined: 18/04/2013 Location: AustraliaPosts: 302 |
Phil23 Regarding your Device Manager entry under Human Interfaces Devices If you want to track down more details on a device that does not reveal itself easily the following. Double click on the item > Details Tab > First or second line, this will look a bit confusing perhaps. I don't have a windows machine running just now so following is from memory and a note I have here. I have had a refresher course in some Windows work involving checking out devices with no clear naming. The line you are looking for holds something like the following, the order is important, the VEN entry first then the DEV entry: [quote]..VEN8086DEV3B64..[/quote] This is a real example of a USB device, I write down the two sets of four hex characters 8086:3B64 then I google this. In this case the top hit gave me the following line, from which I could guess it had nothing to do with my USB analogue to Digital converter I was using for VHS tape digitising. [qoute]8086 3b64 = Intel Management Engine Interface (MEI) Driver ...[/quote] |
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| Phil23 Guru Joined: 27/03/2016 Location: AustraliaPosts: 1664 |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 5913 |
Phil, Run the attached program and see what info it gives when you insert and remove the device. It is intended for 'working' devices but there may be some useful info. 2016-05-12_222203_USBactivity.zip Jim VK7JH MMedit MMBasic Help |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 5913 |
More info. The device should be powered externally and power applied before connecting the USB. Every time you do a rest of the device, the USB will disconnect and reconnect. This upsets most terminal programs. It is easier to work with an external USB-TTL adapter which stays active during reboots. If you are using Windows10, the Microsoft drivers work well. All other versions of Windows need the Silicon Chip driver. The output from my USBactivity program when the device is plugged in for the first time (no driver loaded) Once the driver has loaded (without any intervention from me) the device is recognized much quicker If I try to power the device from USB - no responce. If you are using the SC driver, you will only get the 'WM_DEVICECHANGE 7' messages Jim VK7JH MMedit MMBasic Help |
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