I need help about adsp-21584 spi2.

Question

Hello. 
 I had trouble on using SPI2 DMA27 . The SPI2 is slave configure connect with Ti AM3358. 
 I configure the SPI2 working well no DMA . 
 But I enable DMA27 for receiving, the pREG_DMA27_ADDRSTART register is not the address I wrote. 
 My buffer address is 0x002427d0. But the REG_DMA27_ADDRSTART is 200BE810. 
 However the DMA27 could get DMA interrupt and receive data correctly when I watch the data start on 200BE810.

A new discovery， when I click the button "Restart" on CCES, the pREG_DMA27_ADDRSTART register got 0x002427d0. 
 But DMA27 not working or only recive one byte, and got error stat.

Thanks everyone who helps me !

ADIApproved · Accepted Answer

Hi,

The L1 Private Memory space of SHARC+ can be accessed directly by itself without adding any offset. In order to access internal memories from another SHARC core/ARM core or other peripheral DMA/Memory-to-memory DMA an offset (multiprocessor offset) need to be added.

So, Address start register configuration as below:

*pREG_DMA27_ADDRSTART = (uint32_t)buffer_address|0x28000000;

Please refer below link for more details:
ez.analog.com/.../faq-what-is-multiprocessor-offset-in-adspsc58x-adsp-215xx-processors

Also you need to configure SPU register for secure transactions. Please refer the below link:
ez.analog.com/.../i-have-configured-my-mdma-on-adsp-sc58x-correctly-but-still-the-mdma-transfer-doesn-t-work-as-expected-am-i-missing-something

Regards,
Anand Selvaraj.

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I need help about adsp-21584 spi2.