EasyHID and USB for Newbies??

[sean-h]

Hi rocky

When you call hidWriteEx(VendorID, ProductID, BufferOut(0)), what you are doing is sending a packet as such out to the USB port.
So you can define the length of that buffer in your VB vode at the top of the code:
Private Const BufferInSize = 64
Private Const BufferOutSize = 64

and in your PBP code:

USBBufferSizeMax con 64 ' maximum buffer size
USBBufferSizeTX con 64 ' input
USBBufferSizeRX con 64 ' output

I think min is 8 bytes and max 64.

So just change these variables to cut down the amount of bytes you want to send.

BufferOut(0) is a report ID and data starts at BufferOut(1)

Regards

Sean.

Hi Sean,

If i want to write a byte to the microncontroller can i say BufferOut(2)=%10011111 (" for example)
In your code above:
BufferOut(1) = 68 'Ascii Value for D
BufferOut(2) = 65 'Ascii Value for A
BufferOut(3) = 84 'Ascii Value for T
BufferOut(4) = 65 'Ascii Value for A
hidWriteEx VendorID, ProductID, BufferOut(0)
and to send the info,
are you sending BufferOut(2), BufferOut(3)....and so on?
if i wanna send the values in bufferout(2) would the code look like this below?
hidWriteEx(VendorID, ProductID, BufferOut(0),BufferOut(2) )


Thanks much

[rocky79]

Thanks Sean for the explanation, but there is still something i don't understand.
Question#1:
On the microcontroller side: How can i send the results of a 12 bits A2d Signal from the microcontroller to visual basic.net since USBBufferout is defined as a byte.
Question#2
on the Visual basic.net side when your ready to send data back to the controller:
do you just include all the 64 bufferout bufferout(1) bufferout(2)....bufferout(63)
HidWriteEx, VendorId, ProductID, BufferOut(0), BufferOut(1)....BufferOut(63)
Or is there a shorter way to do it.

Thanks Sean

[rocky79]

Question#2:
On the visual studio.net side: In this code below that i got from EasyHid how do you fill in where it says: put your code here?
I would appreciate Any examples:

Public Sub OnPlugged(ByVal pHandle As Integer)
If hidGetVendorID(pHandle) = VendorID And hidGetProductID(pHandle) = ProductID Then
' ** YOUR CODE HERE **
End If
End Sub

'************************************************* ****************
' a HID device has been unplugged...
'************************************************* ****************
Public Sub OnUnplugged(ByVal pHandle As Integer)
If hidGetVendorID(pHandle) = VendorID And hidGetProductID(pHandle) = ProductID Then
' ** YOUR CODE HERE **
End If
End Sub

'************************************************* ****************
' controller changed notification - called
' after ALL HID devices are plugged or unplugged
'************************************************* ****************
Public Sub OnChanged()
Dim DeviceHandle As Integer

' get the handle of the device we are interested in, then set
' its read notify flag to true - this ensures you get a read
' notification message when there is some data to read...
DeviceHandle = hidGetHandle(VendorID, ProductID)
hidSetReadNotify(DeviceHandle, True)
End Sub

'************************************************* ****************
' on read event...
'************************************************* ****************
Public Sub OnRead(ByVal pHandle As Integer)

' read the data (don't forget, pass the whole array)...
If hidRead(pHandle, BufferIn(0)) Then
' ** YOUR CODE HERE **
' first byte is the report ID, e.g. BufferIn(0)
' the other bytes are the data from the microcontrolller...
End If
End Sub

'************************************************* ****************
' this is how you write some data...
'************************************************* ****************
Public Sub WriteSomeData()
BufferOut(0) = 0 ' first byte is always the report ID
BufferOut(1) = 10 ' first data item, etc etc

' write the data (don't forget, pass the whole array)...
hidWriteEx(VendorID, ProductID, BufferOut(0))
End Sub
End Class

[sean-h]

Hi Rocky

I got compile errors in VB2005 so sticking with VB6, does it compile okay with ,net your end?

The two main routines to worry about and get you going are receive and transmit Data Routines.

Please scroll up on this post as I have given some VB examples already on what you have just asked.

Regards

Sean.

[rocky79]

sean,
Sorry for the late reply, my computer crashed so i was crippled for the past week. I will try your code as soon as i get things back in place.
thank you much

[scorpion]

Hi
I was wondering what I might be doing wrong...
I used HIDMaker to make an input device. Im using the standard HID descriptors, so I am not writting any PC side software.
Everything is working well, but I have two analog inputs. They are both set to words so i can use the 10bit a/d. but when I look at the input on the computer its only 8 bit. and if i right justify the results i am only getting a change of 3.... which is what i would expect if it was only sending 8 bits.

hrm........
if i do some math (invert one input) i can offset the output to 10 bits, so is my a/d conversion 8 bits?

I have used 10 bit inputs on other projects with other pics and I have never ran into this problem before.

I have everything set up.

DEFINE adc_bits 10
TRISA = 255
TRISB = 255
ADCON0 = 0
ADCON1 = %00001101

does anyone have any idea what im doing wrong?

[PJALM]

USB can only send bytes not words so divide your word into 2 bytes to send to the pc (Byte.HiByte & Byte.LowByte), on the PC side simply convert these 2 bytes back to a Long variable and everything should be fine.

I hope this helps.

[luisfe]

Hello. I'm making a program who include easyhid for the 18f4550 but I have some questions:
I want to pass 10 decimal 2 digit variables and 11 bit variables from the PIC to the PC, then something simmilar in return. Do the usb buffers support this just declaring de proper variables?
Or I need some kind of conversion or trick?
Thank you for your help.
Luis

[towlerg]

USB doesn't really work like that. The buffer is just a string of bytes, the significance is determined by your application. For instance the first byte could be the status of a LED or the first digit of a number.

George

[rocky79]

Hi Rocky

I got compile errors in VB2005 so sticking with VB6, does it compile okay with ,net your end?

The two main routines to worry about and get you going are receive and transmit Data Routines.

Please scroll up on this post as I have given some VB examples already on what you have just asked.

Regards

Sean.

Sean,
I am just wondering if you know any good graphical widgets for Visual basic 6.0. Like meters, gauges, level indicators and so forth.

Thanks

[mister_e]

http://www.picbasic.co.uk/forum/show...light=softwire

Seems to have change now.. maybe there's still some free version for VB6 somewhere

Ask them

[sjohansson]

Hi.
Im using EasyHID and a 18f4550 to communicate with VB6.
I use MicroCode Studio Plus and PicBasic 2.46. I download my programs using Microchip USB bootloader. And this works just fine.
Now I want to write a program that counts how long time an input pin is activated. Typical time will be in range form about 1ms - 120ms.
Normaly I would use "Pulsin" but what I understand the USB commands must be polled every 1ms or so. Is there another way to solve it in Basic?
Maybe to use the timers in 4550? If so, how shall that basic code be written?
Im not skilled enough to write the code in asm so it would be great if it is possible to do it in PicBasic.

Thanks in advance.

/Stefan.

[sean-h]

Thanks Sean for the explanation, but there is still something i don't understand.
Question#1:
On the microcontroller side: How can i send the results of a 12 bits A2d Signal from the microcontroller to visual basic.net since USBBufferout is defined as a byte.

A byte is only 8 bits so you will have to store your result in a variable defined as a Word (16bits)
Now you will need to split the word and send the highbyte and lowbyte out as two bytes.
In your VB program you will then need to take the 2 bytes and joing them back as a word.

Question#2
on the Visual basic.net side when your ready to send data back to the controller:
do you just include all the 64 bufferout bufferout(1) bufferout(2)....bufferout(63)
HidWriteEx, VendorId, ProductID, BufferOut(0), BufferOut(1)....BufferOut(63)
Or is there a shorter way to do it.

Re-read what I wrote above regards data being sent from VB. when you call HidWriteEx, VendorId, ProductID, BufferOut(0) you are telling the USB port to send all the data in the BufferOut.
So if you have defined your BufferOut as being 64 bytes long then when you call HidWriteEx it will send all 64 bytes, if you defined your BufferOut as being 8bytes long then it will send 8 bytes.

So simply load all the buffers up with the bytes you want and call HidWriteEx when you want to send.

Regards

Sean.

[Demon]

Hi rocky
...
USBBufferSizeMax con 64 ' maximum buffer size
USBBufferSizeTX con 64 ' input
USBBufferSizeRX con 64 ' output

I think min is 8 bytes and max 64.
...
Sean.

Nope, 1 to 64 bytes for both input and output buffers according to EasyHID help files under Configuration Details.

Robert

[bigbear]

Is there somewhere that I can see a list of the assembly codes for a PIC such as the 18F4550? From what I understand there are not a huge list of them. It has been a while since I did assembler, but I would like to have the ability to combine PBP and assembler.

[Demon]

You'll have better luck getting an answer to an Assembler-related question if you start a new thread in the General forum:
http://www.picbasic.co.uk/forum/forumdisplay.php?f=7

This thread is about EasyHID and interfacing via USB.

Robert

[mister_e]

Is there somewhere that I can see a list of the assembly codes for a PIC such as the 18F4550? From what I understand there are not a huge list of them. It has been a while since I did assembler, but I would like to have the ability to combine PBP and assembler.

you can mix both of them using ASM and ENDASM. You can have the asm list if you open the .COD file or the .LST file

[Demon]

Ok, I've reread this thread hoping to find a hint why the device is not recognized by windows.

I had it working using HIDMaker FS, but I'm trying to use EasyHID since the resulting code is MUCH more compact. Here's what I've done so far:

- generated code with EasyHID, 1 byte to PC, 30 bytes to PIC.
- modified generated PBP program to include an LCD, that works great.
- move MCHID.dll to VB6 working folder.
- compiled the generated VB code using VB6.
- started up the executable.
- reset the PIC and that's when the error appears in Windows.

Can the generated VB6 code work without doing any input or output? I was trying to just get a skeleton VB6 program working first, and then add 1 feature at a time.

Robert

[mister_e]

Sure the VB program can work without any in/out.

[Demon]

Well that's good news.

One thing that I find strange is that I don't get the same number of generated files between each software. I would have expected that both would have to override the same number of files.

EasyHID:
- DESCProject.ASM
- USBDESC.ASM
- Project.ASM
- Project.PBP

HIDMaker:
- descript.ASM
- usb18.ASM
- usb18.INC
- usb18mem.ASM
- usbdesc.ASM
- Project.BAS

Is that normal?

Robert