Multidimensional DMA transfer

Jim95 — Thu, 29 Oct 2020 09:15:35 GMT

Hello,

I try to transfer data between a 2 dimensional buffer (read) and a 1 dimensional buffer (write) using the SmartDSP functions.

All the data looks like correct in the BD's but the transfer remains wrong the second buffer remains empty.

My function to initialize the DMA chain

os_status init_2dim_dma_tranfer(uint8_t *source, uint8_t *dest){ os_status status; uint8_t *phys_addr; msc815x_dma_buffer_config_t msc815x_dma_buffer_config; msc815x_dma_attributes_config_t msc815x_dma_attributes_config; msc815x_dma_buffer_md_config_t msc815x_dma_buffer_md_config;     osDmaChainReset(dma_chain_handler);     msc815x_dma_buffer_md_config.high_dim[0].base_count = 0x00;    msc815x_dma_buffer_md_config.high_dim[0].count = 0x80;    msc815x_dma_buffer_md_config.high_dim[0].offset = 0x1C0;    msc815x_dma_buffer_md_config.high_dim[1].base_count = 0x00;    msc815x_dma_buffer_md_config.high_dim[1].offset = 0x00;    msc815x_dma_buffer_md_config.high_dim[1].count = 0x00;    msc815x_dma_buffer_md_config.high_dim[2].base_count = 0x00;    msc815x_dma_buffer_md_config.high_dim[2].offset = 0x00;    msc815x_dma_buffer_md_config.high_dim[2].count = 0x00;  msc815x_dma_buffer_md_config.buffer_dim = DMA_BUFF_DIM_2; msc815x_dma_buffer_md_config.cont_dim = DMA_BUFF_CONT_DIM_2; msc815x_dma_buffer_md_config.freeze_dim = DMA_BUFF_FRZ_DIM_2; msc815x_dma_buffer_md_config.interrupt_dim = DMA_BUFF_INT_DIM_2; msc815x_dma_buffer_md_config.mask_requests_dim = DMA_BUFF_MR_DIM_2; msc815x_dma_buffer_md_config.last = 0;      status = osMmuDataVirtToPhys(source, (void**)&phys_addr);    OS_ASSERT_COND(status == OS_SUCCESS);     msc815x_dma_buffer_config.address = (uint32_t) phys_addr; msc815x_dma_buffer_config.dma_port = DMA_PORT_A; msc815x_dma_buffer_config.interrupt = FALSE; msc815x_dma_buffer_config.size = 0x40; msc815x_dma_buffer_config.arch = NULL; msc815x_dma_buffer_config.md = msc815x_dma_buffer_md_config;  status = msc815xDmaChainBufferAdd(dma_chain_handler, &msc815x_dma_buffer_config, DMA_READ);    OS_ASSERT_COND(status == OS_SUCCESS);    msc815x_dma_buffer_md_config.high_dim[0].base_count = 0x00;    msc815x_dma_buffer_md_config.high_dim[0].offset = 0x00;    msc815x_dma_buffer_md_config.high_dim[1].base_count = 0x00;    msc815x_dma_buffer_md_config.high_dim[1].offset = 0x00;    msc815x_dma_buffer_md_config.high_dim[1].count = 0x00;    msc815x_dma_buffer_md_config.high_dim[2].base_count = 0x00; msc815x_dma_buffer_md_config.high_dim[2].offset = 0x00; msc815x_dma_buffer_md_config.high_dim[2].count = 0x00;    msc815x_dma_buffer_md_config.buffer_dim = DMA_BUFF_DIM_1; msc815x_dma_buffer_md_config.cont_dim = DMA_BUFF_CONT_DIM_1; msc815x_dma_buffer_md_config.freeze_dim = DMA_BUFF_FRZ_DIM_1; msc815x_dma_buffer_md_config.interrupt_dim = DMA_BUFF_INT_DIM_1; msc815x_dma_buffer_md_config.mask_requests_dim = DMA_BUFF_MR_DIM_1;        status = osMmuDataVirtToPhys(dest, (void**)&phys_addr);    OS_ASSERT_COND(status == OS_SUCCESS);     msc815x_dma_buffer_config.address = (uint32_t) phys_addr;    msc815x_dma_buffer_config.size = 0x2000;    msc815x_dma_buffer_config.interrupt = TRUE;    msc815x_dma_buffer_config.md = msc815x_dma_buffer_md_config;     status = msc815xDmaChainBufferAdd(dma_chain_handler, &msc815x_dma_buffer_config, DMA_WRITE);    OS_ASSERT_COND(status == OS_SUCCESS);        /* Bind the chain */    status = osDmaChannelBind(dma_channel_handler, dma_chain_handler);    OS_ASSERT_COND(status == OS_SUCCESS);    #ifdef ENABLE_CLASS_PROFILING   {       msc815x_class_profiling_param_t msc815x_class_profiling_param;       msc815x_class_profiling_param = CLASS_PROFILE_INIT;       msc815x_class_profiling_param.profile_port = DMA_PORT_TO_PROFILE;       msc815x_class_profiling_param.profiling_type = INITATOR_BW;       status = msc815xConfigureClassProfiling(&msc815x_class_profiling_param);       OS_ASSERT_COND(status == OS_SUCCESS);   }#endif      return status;}

I use the parameters find inr the MSC8156 RM for the 2 dimensional buffer.

Is there an exemple show how using the DMA with multidimesional buffers ?

Re: Multidimensional DMA transfer

AndrewinApps — Tue, 20 Sep 2011 22:36:38 GMT

Hello Jim95,

Yes, we do have an example showing multidimensional DMA in SDOS (see attached zip file which includes a few PPT slides regarding this).

This example project is for 8157, but the DMA is the same as in MSC8156, so the example still applies.

Please let me know when you've downloaded the attachment so I can remove it from the post.

(Attachment removed.)

Re: Multidimensional DMA transfer

Jim95 — Wed, 21 Sep 2011 13:46:47 GMT

Thank you Andrew I have downloaded it

Re: Multidimensional DMA transfer

MBharath — Wed, 12 Oct 2011 18:27:00 GMT

Hi,

   I have a similar problem with dma transfer. I want to transfer a 2 dimentional array to a 2 dimentional array. Both the arrays are 2 Dimentional. Please let me know how a 2 dimentional transfer can be done using DMA.

   Please let me know whether skipping of some data in each row of source array of a 2 dimentional buffer can be tranfered to destination which may be 1 or 2 dimentional.

   Please let me know where i can find an example for 2 dimentional dma transfer.

Thanks and Regards,
Bharath M

Re: Multidimensional DMA transfer

Jim95 — Thu, 13 Oct 2011 13:56:30 GMT

The code example I give in my fisrt message is correct but I had a problem with the cache.

Maybe you just have to flush the cache to complete the transfer

Re: Multidimensional DMA transfer

didib — Sun, 25 Dec 2011 21:17:23 GMT

Can you upload the DAMA example again?

Thanks!

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