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Usb with PIC
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lucky



Joined: 12 Sep 2003
Posts: 46
Location: South Coast - England

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FT232BM USB IC
PostPosted: Mon Oct 18, 2004 9:10 am     Reply with quote
FTDI FT232BM USB IC for �8. Simple to use, Cheep & very good. Just converts USB to RS232 then use the PIC as tho it was RS232. Cool [/url]
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Lucky
www.mpic3.com - MPIC3 player project, Forum, Downloads, Online Shop
birumher



Joined: 28 Apr 2004
Posts: 10

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PostPosted: Tue Oct 19, 2004 6:03 am     Reply with quote
I have used USBMOD2 from
http://www.ravar.net/R_ProductUSBs.htm
its using FT8U245AM chip. Maybe its little bit expensive but very easy to implement...

Here is CCS code I have used for first try...
PortB is DATA port ...
The code is for 16F877 but works fine with 18F452 if you change pin adresses...

Code:

#bit RXF = 7.2 // PORTC 2
#bit TXE = 7.1//PORTC 1
#bit WR = 7.0// PORTC 0
#bit RD = 8.3//PORTD 3
#byte B = 6 //PORT B


void main() {
   byte k;
   set_tris_b(0);
   set_tris_c(0b11111110);
   k = 65;
   RXF = 1;
   DELAY_MS(100);
   while (TRUE) {
      DELAY_MS(1);
      RXF = 1;
      WR = 1;
      RXF = 0;
      output_b(k); //WRITE to USB
      DELAY_MS(1);
      WR = 0;
      k += 1;
   }
}
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