I  am using ADSP 21364 processor for audio processsing application.

For interfacing ADSP21364 to system USB is used.FT232R (USB to UART 

convertor) is used for that purpose.Serial port of ADSP21364 is used for 

USB interface.But in application note EE191 its given than serial port 

in UART mode,the processor has to poll the serial frame sync pin in each 

serial clock signal.Is it mean the core is idle in these condition?

Can the processor be used for some other purpose during this period?

Regards
saju

cee4max wrote:
>
> I am using ADSP 21364 processor for audio processsing application.
>
> For interfacing ADSP21364 to system USB is used.FT232R (USB to UART
>
> convertor) is used for that purpose.Serial port of ADSP21364 is used for
>
> USB interface.But in application note EE191 its given than serial port
>
> in UART mode,the processor has to poll the serial frame sync pin in each
>
> serial clock signal.Is it mean the core is idle in these condition?
>
> Can the processor be used for some other purpose during this period?
>
> Regards
> saju
>
> I haven't reviewed this ap note recently in detail, but you can 
> certainly use the DSP for other calculations while implementing a UART 
> function using a SPORT. We did this with an ADSP-21261 which for this 
> situation is identical (except for core clock).

It would be much easier to use an ADSP-21369 or ADSP-21371 since there 
is a hardware UART on the device. We usually use the FT245R with the 
SHARC and avoid the UART altogether. In this situation, we still treat 
the USB as a fast com port on the PC side.

Al Clark
Danville Signal Processing, Inc.

> useusese the _._,_.___
>
>