(true)MIDI USB Board

[Synthex]

PCB Layout in DipTrace format later in this topic.

[dmitri]

I thought both your CDC and MIDI firmwares had fuses settings included in the .hex. Am I wrong? I used a JDM programmer. I couldn't make WinPic800 to recognise my JDM programmer and Icprog doesn't yet list PIC18F2550 (tried setting it to PIC18F4550 but for some reason it only writes first 1000h words) so I used PICPgm which worked well.

Fuses are settings in the .hex and JDM programmer is good.
I use WinPic800 with a GTP-USB Plus.

Could you test this one ?

Same result. The weird thing is when I program/read the chip in circuit and after programming/reading complete Windows finds MegaDrum USB and installs drivers and it works! But once I reconnect USB cable without ISCP Windows says it found an unknown malfunctioning device. I'm lost.

[Synthex]

Same result. The weird thing is when I program/read the chip in circuit and after programming/reading complete Windows finds MegaDrum USB and installs drivers and it works! But once I reconnect USB cable without ISCP Windows says it found an unknown malfunctioning device. I'm lost.

Very Strange !
It works but only with the ICSP connector ?

[dmitri]

Not only this but also a certain voltages on pins 26,27,28:

26 -> -0.6V
27 -> -0.017V
28 -> +4.7V

And after I disconnect ISCP cable it still works. But once I reconnect USB cable after this it stops working:(

[Synthex]

Not only this but also a certain voltages on pins 26,27,28:

26 -> -0.6V
27 -> -0.017V
28 -> +4.7V

And after I disconnect ISCP cable it still works. But once I reconnect USB cable after this it stops working:(

Do you change fuses settings ?

[dmitri]

Not only this but also a certain voltages on pins 26,27,28:

26 -> -0.6V
27 -> -0.017V
28 -> +4.7V

And after I disconnect ISCP cable it still works. But once I reconnect USB cable after this it stops working:(

Do you change fuses settings ?

Only one bit - LVP. Otherwise I'm not able to do in circuit programming. But I tried without modifying any fuses at all and result was still the same.

[Synthex]

Only one bit - LVP. Otherwise I'm not able to do in circuit programming. But I tried without modifying any fuses at all and result was still the same.

I have tried the test by activating the LVP, and it is not working.
In fact, i use RB7, RB6 and RB5 to control a bicolor LED to display the activity and status of the USB bus.
I can send you a new version by enabling LVP and disabling the led control.

But, with no LVP, it must work ...

[dmitri]

Only one bit - LVP. Otherwise I'm not able to do in circuit programming. But I tried without modifying any fuses at all and result was still the same.

I have tried the test by activating the LVP, and it is not working.
In fact, i use RB7, RB6 and RB5 to control a bicolor LED to display the activity and status of the USB bus.
I can send you a new version by enabling LVP and disabling the led control.

But, with no LVP, it must work ...

Yes, please, post the version without led control and with LVP enabled.

[lond]

Hi!

Can you change the ICSP pin-out so it follows Microchip standard 6-pin connector for In-Circuit Serial Programming (ICSP)?
The pin-out is listed in table below:

Pin Function
1 _MCLR/Vpp (programming voltage)
2 Vcc(+5V)
3 Gnd
4 Data
5 Clock
6 LVP (low-voltage programming mode control)

I use a PICKit 2 Starter Kit-programmer to flash my PIC's.

[Synthex]

Yes, please, post the version without led control and with LVP enabled.

Here is this version.