Re: unkown Device ID .....

[donvukovic]

I have ported the PIC boot code to a PIC16f1823 device, using the alternate USART pins RC4/RC5.

I am also trying to use the POWER OFF circuit suggested at the bottom of:
http://tinypicbootload.sourceforge.net/hardware_connection.html

I have modified the PIC code to use the alternate pins and wired up the transistors for the POWER OFF circuit.

On my logic analyzer I see the RTS turn the power off, the serial $C1 come from a USB serial port, the $37, $42 come from the PIC.

https://dl.dropboxusercontent.com/u/74667085/tinyboot/logic%201.png
https://dl.dropboxusercontent.com/u/74667085/tinyboot/logic%202.png

The PC app sees:

Check Device...
send: C1
receive: 00, 37

It would seem that the POWER OFF is being seen as a $00 byte by the USB serial port.

Has anyone tried the POWER OFF circuit ?
Is there a way to clear the Rx buffer in the PC App before the $C1 is sent out ?

Thank You for your assistance.

Don

[Dan]

hi,donvukovic

Please try the following.

Form1.cs line 2203
// send "ask" to PIC
if (!checkVirtualPIC.Checked)
{
serBuffer[0] = 0xC1;
serialPort.Write(serBuffer, 0, 1);
ADD--------------------------------------------------
serialPort.DiscardInBuffer();

---

                }

[donvukovic]

Thank You Dan,

It works !

Don