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18F4550 USB

 
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vtrx



Joined: 11 Oct 2017
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18F4550 USB
PostPosted: Sat Jul 06, 2019 8:24 pm     Reply with quote
What is the difference between 'while(!usb_put_packet...' and 'usb_put_packet...' ?
PCM programmer



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PostPosted: Sun Jul 07, 2019 2:54 am     Reply with quote
Quote:
while(!usb_put_packet...

It means:
Stay in the while() loop until the PIC successfully sends a USB packet.
If the PIC sent the packet OK, then exit the while() loop.
vtrx



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PostPosted: Mon Jul 08, 2019 9:32 am     Reply with quote
Is there any advantage or performance in using one or other?
temtronic



Joined: 01 Jul 2010
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PostPosted: Mon Jul 08, 2019 9:58 am     Reply with quote
well....
IF the PIC stays in the while loop unitl the USB packet is sent, it could stay there FOREVER should the USB hardware or 'other computer' crashes. There's probably 100 or more scenarios that will keep the PIC 'twiddling thumbs' with a bad USB connection.....

Jay
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