- #Can you use a usb virtual port with ezusb how to
- #Can you use a usb virtual port with ezusb serial
- #Can you use a usb virtual port with ezusb update
- #Can you use a usb virtual port with ezusb software
- #Can you use a usb virtual port with ezusb code
#Can you use a usb virtual port with ezusb serial
#Can you use a usb virtual port with ezusb how to
(We could have taken COM1 itself but that will be little bit confusing so we will stick to COM3 first, once we know how to do it we can access any port in similar manner). My requirement is very simple I want to access COM3 in my Kubuntu guest installed under Virtual Box Virtual Machine. My computer has four serial port COM1, COM2, COM3 & COM4. Even though the names are different they refer to the same Interrupt and IO ports and that’s how we map these names. As my example involves both operating systems it might create some confusion, as a rule of thumb what will call COM1 in windows will be /dev/ttyS0, COM2 will be /dev/ttyS1 and so on. In windows like operating systems serial ports are named like COM1, COM2 and so on while in Linux they are named like /dev/ttyS0, /dev/ttyS1 and so on.
![can you use a usb virtual port with ezusb can you use a usb virtual port with ezusb](https://venturebeat.com/wp-content/uploads/2015/09/Screen-Shot-2015-09-09-at-1.17.50-PM.png)
Before jumping into action we will just find little more information about serial ports The problem is, it can be done in more then one way and that’s where user might get confused that’s why I am writing this post. Virtual Box does provide this feature and its quite easy to configure as well. So I installed Kubuntu as Guest OS on my Windows Host and I wanted to access the host serial port for debugging purposes. I hate to manage two computers for two reasons first is it makes workplace really messy with extra wires and Second is I always need some space to keep items like Power Supplies, Oscilloscopes, Programmers, Debuggers etc. I have Windows XP as primary Operating System, however, I need to work on Linux for lot of hobby projects.
#Can you use a usb virtual port with ezusb software
I could use level translation I guess.As an Embedded Software Engineer serial port access is very critical requirement for me irrespective off which OS I am using and how I am using it (I mean with or without virtualization). The only other thing I can think of is an ARM running very fast, but none have USB host and 5V tolerant inputs. The architecture is great, interrupt latency is very low and with GPIOs and virtual ports you can make it this happen in under 1us! It's very possible to do this on an XMEGA running at 32MHz. It's basically a demux, take one or two inputs and output one of 2 or 4 words. If the Parallel Master Port could be a slave port it would probably work.
![can you use a usb virtual port with ezusb can you use a usb virtual port with ezusb](https://rion-sv.com/rionstation/RionStation_en/images/57550_Links_JPG/050/55750_050_020_020_100.jpg)
I hadn't thought of the latency issue with PIC32. PIC32 loses out on latency due to an instruction cache but probably wins out by nature of the higher clock speeds available and the shadow registers available on higher spec parts. You'll most likely need a prioritised interrupt controller so that, for example, a low speed UART interrupt doesn't mess up your timing.
#Can you use a usb virtual port with ezusb update
That 2us GPIO update requirement rules out PIC24 at 16MHz where interrupt latency (10 cycles minimum I think) will kill it. Yikes! Those timing restrictions make things really difficult. Some STM32 parts look suitable and while the STM32 HAL stuff isn't well documented, the fact that there is any documentation at all puts it in the lead on that front.Įxternal USB host ICs are an option but tend to be either large, expensive, difficult to hand solder or all three.
#Can you use a usb virtual port with ezusb code
On the plus side it is 5V tolerant and there is some example code doing what I need. Maybe I could hand optimize in assembler.
![can you use a usb virtual port with ezusb can you use a usb virtual port with ezusb](https://venturebeat.com/wp-content/uploads/2020/01/IMG_9740-e1578499253269.jpg)
Other options include a PIC24FJ64GB002 with USB OTG, but Microchip's free XC16 compiler lacks optimizations and the maximum 16 MIPS it provides is borderline for what I'm doing. Unfortunately only HID mouse is listed under USB Host middleware, and while there is a generic USB host package the documentation is 404 (. I understand LUFA supports it, has anyone tested host functionality? The AT90USB647 looks ideal because it can be run at 5V which is useful to me, but the ASF does not have any USB support for it. I want to read a USB joystick using USB Host/OTG on an MCU.