A reset button seems to fix it. My guess is that this is because, by this time, you've switched the direction of the endpoint, and hence you are trying to read a write pipe. In avrdude stkv2. I'm not convinced of the logic of this anyway, the protocol is well defined, and my guess is that if there are problems then the getsync routine should do the job of removing spurious data.
I know virtually nothing about USB and so don't really understand why this kind of code is there The AVRDude code uses a logic layer for serial data, and thus uses the interface a byte at a time. The same layer is redirected to libusb calls for USB programmers, so perhaps some additional tweaking is needed. Ok, here's a very quick patch against avrdude trunk It basically disables the "drain" functionality for any USB device.
Again, I've only looked at this on OSX, someone will need to verify that is doesn't do any damage on Linux, and also see if it helps on Windows. Sadly not - I haven't been able to write a single line of code for quite a while now due to an influx of University assignments. If you don't have time for that, let me know and I'll write it up. Having said that, I can't really see why the function you've found to be problematic is needed at all anyway as you say, since USB devices shouldn't send any junk data - and if they do get into an undefined state the best fix is a USB bus reset.
PS: Please don't mistake my lack of time for lack of interest - I'm very excited about getting this fixed, but at the moment passing my subjects is my top priority. Lee, you rock. This fixed my avrdude issues on I'm thinking about adding this one to the avrdude homebrew formula on github.
I hate to resurrect an old thread, but is a version of avrdude with this patch available for Win7 64bit? AVRStudio works fine with avrisp, and I've installed the 1. I was hoping this would fix the unit and allow AVRDude usage. Skip to main content. Log in or register to post comments. Go To Last Post. Level: New Member. Posts: 2 View posts. Posted by AngusOne : Mon. Nov 1, - AM. Fivestar widget 1 2 3 4 5. Level: Raving Lunatic. Posts: View posts. Posted by abcminiuser : Tue.
Nov 2, - AM. Log in or register to post comments Top. Posted by AngusOne : Tue. Thank you! Level: Hangaround. Posted by GordonFreeman : Mon.
Mar 21, - PM. Kind of an old topic, but I'm wondering if there's any update on this? Posted by abcminiuser : Mon. Hm, that's too bad. Thanks anyway! Posts: 6 View posts. Posted by essele : Tue. Apr 19, - PM. Hi, I'm having what seems to be the same problem on OSX Anyway, I should get a chance to work on it over the next couple of days and will repost.
Regards, Lee. Level: Posting Freak. Posted by kscharf : Tue. Depending on what type of cable you plug in, it will decide whether it should act as a host or a device. If you use an A-to-mini-B cable to plug it into your computer, it knows it should act as a device and does so.
On the other hand, if you use the other supplied cable that is mini-A-to-A, it knows it should act in host mode, it will behave like one. This is a chip with all of the necessary hardware built-in to be either a USB host or device, so the name lets you know that.
In 8-bit AVRs, flash is designed for code storage and must be erased in large chunks. If you want to erase a byte to write a new value in its place in flash, you must erase many of the neighboring bytes as well.
The idea is to put your code and large constants into flash because they will only change when you change the firmware. You can put program configuration values that must be saved across power cycles into the EEPROM and not worry about erasing other nearby bytes when you change them.
Aside from the microcontroller, the board also has a small joystick, a temperature sensor, two LEDs which can each be green or red , two buttons one is for resetting, the other one is a bootloader entry button which can also be used for your own purposes , and two external memory chips. It comes programmed with a demo application that acts as a mouse and USB disk when plugged into your computer. The demos seem to work great. Just like I said in my last microcontroller development board review, the demo apps are exciting and all, but the real value in these boards comes when you write your own programs.
This can be quite complicated in this case because the most impressive built-in peripheral is the USB controller. USB is a monster of an interface to use for a simple program.
Remember when I said earlier that AVRs are straightforward to program? Well, the USB controller is an exception.
It handles talking to the USB controller for you, so all you have to do is work with a higher-level API instead of talking directly with the USB registers in the microcontroller. We will, however, use the USB capability of the chip to flash your new compiled program using the bootloader.
Here goes nothing! As of the date of this review, the latest version of Eclipse is Indigo 3. Extract the contents of the zip archive to a location of your choice. This will make it easy to create cross-compiled AVR projects in Eclipse. Now, install the AVR development tools. Install the Windows AVR development tools. This will include gcc, binutils, avr-libc, and avrdude. They are packaged together and called WinAVR note: when accessing this site, I occasionally get redirected to another site because of the webring they are using — if that happens, just click the back button in your browser.
Go ahead and download the latest version of WinAVR and install it. Make sure during the installation you check any boxes asking to add WinAVR binaries to your path.
We will use this to program the new device. Linux can be picky about the permissions of USB devices, so you will probably need to add a udev rule. The purpose of this last command is to get udev to reread its list of rules. After doing this, the permissions for the USB device should be correct the next time you plug it in.
Open up Eclipse. A window will pop up. You can leave them both on if you want, but I tend to remove the Debug configuration because it breaks some of the optimizations that avr-libc depends on the delay functions, for instance. Click Next, and then you will be asked to name the microcontroller and clock frequency. Finally, click Finish. The code will be very similar to some of my earlier microcontroller programming examples. They behave just like they are separate LEDs.
So in effect, you have four LEDs available, although each pair of green and red LEDs overlap with each other and look kind of strange when they are both on at the same time.
Anyway, this is all we need to know to get a simple program running. Name your file main. This command actually builds all open projects, but since this is the only project we have open, it will work. Anyway, you should have a. I want to share a quick note about this code before we get to the rest of the flashing. Any bits that are 0 are unaffected.
The code generates results identical to but is more efficient than :. If all went well, you are ready to test your newly-created firmware project. Connect the board to your computer. Alternatively, you could also just hold down the HWB button while plugging the board into your computer. Open up Flip you installed it already, right? A dialog box will come up—click Open. All of the buttons in the Flip window should be enabled now.
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