i.MX ProcessorsのトピックRe: CRC Unit in SDMA

CRC Unit in SDMA

larstraeger — Fri, 08 Mar 2013 16:28:08 GMT

Hello,

Did somebody used the CRC Unit in the SDMA Core of the i.mx53? I actually tried, but can't access them like Burst or Per Functional Registers via stf/ldf instructions. Something like :

stf Greg[3],CA # Greg3 preloaded with 2

( Hex-Inst. => 0x6b80 )

to load the Polynomial Register (CA) did not work. Where could be the Bug?

some hint's will be very helpful

Best regards

Lars

Re: CRC Unit in SDMA

admin — Tue, 16 Apr 2013 03:06:17 GMT

Lars, have you tried following the steps of table 66-5 of the i.MX53 RM?

Re: CRC Unit in SDMA

larstraeger — Tue, 16 Apr 2013 07:41:53 GMT

Hello Grant,

yes i use the recommendet order. first load CA, then init CS and process data. But everytime i read 0x00 from the CS Register.

I also tried to load the CA register with a value (0x2) and read it back after channel script finished from the channel context area. But the value was 0x00. So i think i use the wrong opcodes for CRC ldf/stf instructions?

Is the opcode/hex-inst. right?:

stf Greg[3],CA # Greg3 preloaded with 2

( Hex-Inst. => 0x6b80 )

Thanks and Regards

Lars