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USB PIC18

 
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Amr_PIC
Guest
USB PIC18
PostPosted: Wed Jun 03, 2009 10:55 am     Reply with quote
Anybody could help me by explaining the last input (toggle) of this USB function:
Code:
usb_put_packet(endpoint,*ptr,len,toggle);

I found this sentence in (pic18_usb.c) documentation:
(Toggle - whether to send data with a DATA0 pid, a DATA1 pid, or toggle from the last DATAx pid)

But I can't understand??

Also I want to know if writing:
Code:
#fuse XTPLL,INTXT, PLL1

Is true to indicate that a crystal (4MHz) will be used with pll for USB and the internal oscillator will be used for CPU.

Thanks a lot for your help. Very Happy Very Happy
Amr_Pic
Guest
Thanks For NO REPLY
PostPosted: Tue Jun 09, 2009 8:43 am     Reply with quote
Thanks For NO REPLY Surprised Surprised Surprised
Amr_PIC
Guest
Thx
PostPosted: Tue Jun 09, 2009 8:44 am     Reply with quote
Sad Sad Sad
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Tue Jun 09, 2009 9:26 am     Reply with quote
The purpose of the toggle bit is fully documented in the USB20 spec, see www.usb.org. The PIC18 manual is rather refering to the meaning of data toggle than giving an explanation.

Regarding Oscillator select fuse bits, the PIC18 manual clarifies that the oscillator modes are mutual exclusive, you can either select XTPLL or INTXT. As far as I understand, INTXT won't work for High Speed USB. But you may want to consult manual chapter 2.3 Oscillator Settings for USB yourself.
Ttelmah
Guest
PostPosted: Tue Jun 09, 2009 12:52 pm     Reply with quote
The syntax to use the external oscillator for USB, and the internal for the CPU, is just:

INTRC,PLL1,USBDIV

The external oscillator block, is _not_ turned off by selecting the internal oscillator for the CPU. Look at the oscillator diagram for the chip, and the names against the oscillator paths in this.

Best Wishes
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