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USB errors

 
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YvetteBaker



Joined: 25 Mar 2020
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USB errors
PostPosted: Wed Mar 25, 2020 3:16 am     Reply with quote
Hello !

I try to use the USB with a dsPIC33EP256MU806 uC. I would like to use CDC communication, with the own library of CCS. I need to send 8192 bytes via USB to a PC where a script receives the bytes and checks them.
The sent example pattern is: 0x11000000..0x110007ff.
I checked the line with scope and I realized that some double words in the message are different than those I wanted to send, so they automatically change right at sending.
Eg.: The previous double word is: 0x11000304 so I expect that the next is: 0x11000305 but it is 0x11000300.
OR
The previous double word is: 0x110003CF so I expect that the next is: 0x110003D0 but it is 0x1100C1D0.

I tried the same code on a PIC18F2550 and the result was wonderful: there were no errors.

Do you have any idea what I should try? Could you help me?
Ttelmah



Joined: 11 Mar 2010
Posts: 19513

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PostPosted: Wed Mar 25, 2020 4:20 am     Reply with quote
First thing. Post your clock settings. What crystal are you using?.
My settings for USB are:
Code:

#bit U1OTGSTAT_SESVD=getenv("BIT:SESVD")
#define USB_CABLE_IS_ATTACHED() (U1OTGSTAT_SESVD) //cable attached for DsPIC
#include <usb_cdc.h> //Usb


Your chip must have a crystal for USB operation.
So something like:

#USE DELAY(INTERNAL=120M, AUX: CRYSTAL=8M, CLOCK=48M)

To use a secondary crystal, with primary clock from the internal RC.
(using SOSC).
or.

#USE DELAY(CRYSTAL=8M, CLOCK=120M, AUX:CLOCK=48M)

To use a primary 8MHz crystal. In both cases assuming 120M operation.

Then how is your Vusb generated/connected?.
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