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How to configure SDMA with McBSP2

Felipe Souza
Prodigy 195 points

Other Parts Discussed in Thread: SYSCONFIG

Hi !

I'm using a Mistral EVM Board (OMAP 3530) with Code Composer Studio 4 (CCS4), but I have some problems in configure e use SDMA with  McBSP2.

I'm setting the SDMA module to be active when McBSP2_TX is asserted and start to transfer data.. I'm configuring SDMA as below:

 

 

    DMA4_OCP_SYSCONFIG = 0x00000002;                      // Reset

    while ( (DMA4_SYSSTATUS & 0x00000001) == 0);       // Waits Finish Reset

    DMA4_CSR10 = 0x00001FFE;                                          // Reset Status Register

    DMA4_OCP_SYSCONFIG = 0x00001028;                     // Clock Free Running , DMA Ignores MSuspend Signal

    DMA4_CSDP10 = 0x00000001;                                       // Select Endiness For Source And Destination

    DMA4_CCR10 = 0x07081001;                                         // Select DMA Interrupt Request , Type Of Increment

    DMA4_CEN10 = 0x00000080;                                         // 128 Elements

    DMA4_CFN10 = 0x00000006;                                          // 6 Frame

    DMA4_CICR10 = 0x00000008;                                        // Enable End Of Frame Interrupt

    DMA4_CSSA10 = (unsigned int)TSP;                              // Source Start Address

    DMA4_CDSA10 = (unsigned int)0x49022008;               // Destination Start Address McBSP2_DXR

    DMA4_IRQENABLE_L0 = 0x00000400;                          // Enable Interrupt For Channel 10

    DMA4_CCR10 = DMA4_CCR10 | 0x00000080;             // Enable Logical Channel 

 

 

The McBSP2 is configure as below:

      McBSP2_SPCR2 = 0x00000200;       // Set Run Free Mode For TX And RX

 

      McBSP2_SPCR1 = 0x00000200;

      McBSP2_XCR2 = 0x00000000;          // Set 8 bits Transmitter With No Delay

      McBSP2_XCR1 = 0x00000040;          // Set 1 Word Per Frame 8 Bits Word

      McBSP2_PCR = 0x00000A0A;            // Set Frame Sync Mode With Polarity Low For TX Clock Polarity Negative , SCLKME = 0

      McBSP2_SRGR1 = 0x00000F01;      // Setting Up Frame Sync Width (16 Bits) And Clock Divider

      McBSP2_SRGR2 = 0x000012DE;      // Configure Clock Settings And Frame Width , CLKSM = 0 

      MCBSP2_XCCR = MCBSP2_XCCR & 0xFFFFFFF7;      // Set Interrupt For DMA 

      McBSP2_SPCR2 = McBSP2_SPCR2 | 0x00000040;      // Set Interrupt For DMA 

      McBSP2_SPCR2 = McBSP2_SPCR2 | 0x00000080;      // Enables Frame Sync Logic

      McBSP2_SPCR2 = McBSP2_SPCR2 | 0x00000001;      // Enables Transmitter

 

I'm configuring first the SDMA and then configure the McBSP2 (enable frame sync). 

 

All these configuration are made in DSP and I'm emulating it with XDS510 in CCS4.

Could anyone see something missing or some mistake I'm making?

I'm not configuring the RTSC and DSP/Bios files in CCS4, are they nedded ?

Could be something I'm not enabling, like INTC Module?

 

Anyone can indicate some sample or document that will help me find out the problem ?

 

Tanks all. 

Best Regards

  • 0
    TI__Guru* 84110 points

    This is a question about OMAP. I moved your previous posting of this question to the OMAP forum, and you should have received an email stating that it had been moved.

    Why have you included tags for the C6455 EVM and the C6474 EVM on your two identical postings?

    You will find more people knowledgeable about OMAP and SDMA on the other forum.

    I know the C6000 parts pretty well, and SDMA means something internal to the C64x+ core. I believe that for OMAP SDMA means System DMA which may be an ARM-specific thing, but I do not know for sure.

    Most of the OMAP experts in the Community will not be looking here to offer answers.

  • 0 in reply to RandyP
    Prodigy 195 points

    Hi,

    I'm so sorry about this , but I didn't receive the email that my post was moved! I search the forum and I didn't find it, so I post it again.

    My problem was the DMA in DSP side , so I post it with DSP tag. I didn't know for sure witch DSP was.

     

    So I try to move it again with OMAP tag.

     

    Thanks.

  • 0 in reply to Felipe Souza
    TI__Guru* 84110 points

    I have reported your missing email. Sorry about that. Have you been receiving emails about your and my replies on this thread?

    The DSP core is the C64x+ which is common to some of the other DSP devices in the C6000 family, but the SDMA and peripheral configurations are different from device to device.

    In your OMAP posting, you may want to add more information about what is the symptom you are experiencing. You have said that you are configuring some registers and want to know what is wrong with the configuration, but no information on what is working and what is not working.

    One good first step would be to get the McBSP working without SDMA, just doing a simple DSP program that polls for status and directly accesses the McBSP registers. If that works, then try to get the SDMA working on top of that.

  • 0 in reply to RandyP
    Prodigy 195 points

    Hi Randy ,

    I realize that my doubt is about OMAP35xx and I find my other post there.

    And my problem is that the DMA don't work because the McBSP is working properly. I can write data and monitor the pin on logical oscilloscope but doing it manually.

    So my really problem is configure the DMA. I think it is associated with the environment (CCS4).

    Well let's see if someone can answer me.

     

    Thaks a lot.