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Hi there, I'm new in programming DSP's. I'm using the C6711DSK. At the moment i'm trying to set up a edma transfer to capture sound samples from codec/mcbsp. Therefore I used the link feature of the edma controller. I'm using the channel for McBSP0 (#13), configure it to my demands and enable linking. For the linking, i have two additional parameter sets, which are linked to each other. On the first glance it seems to work. But on a closer look, i see some missing samples form McBSP. At the moment i can't say if they're dropped by edma or by McBSP. Anybody a idea or some hints? I read in the documentation it's possible to get the edma stalled, if the priority queue for a level is full. But I don't think this is the reason, because the debugger shows in PQSR no full queue. Are there any other known reasons? Thanks, Adalbert Here's the code i use to init mcbsp and edma: void configMCBSP() { hMcbsp0 = MCBSP_open(MCBSP_DEV0, 0); if(hMcbsp0 != INV) { MCBSP_configArgs( hMcbsp0, // 0x01000000, //SPCR 0x01002000, //SPCR - right justify and sign extend 0x00050040, //RCR // 0x00010040, //RCR - unexpected sync, restart transfer 0x00050040, //XCR // 0x00010040, //XCR - unexpected sync, restart transfer 0x20000001, //SRGR 0x00000000, //MCR 0x00000000, //RCER 0x00000000, //XCER 0x00000000 //PCR ); // ???Wait till all registers are set, especially interrupt registers??? //removing reset bits from SPCR MCBSP_enableRcv(hMcbsp0); MCBSP_enableXmt(hMcbsp0); } } void configEDMA() { EDMA_Config Configuration; // initial parameter set, link to reload1 EDMA_Handle hrecevt0; EDMA_Handle hreload0; // Link to reload parameter 0 EDMA_Handle hreload1; // Link to reload parameter 1 EDMA_Handle hinbuff02work; EDMA_Handle hinbuff12work; // setting up channel 13 for McBSP0 receive event hrecevt0 = EDMA_open(EDMA_CHA_REVT0, EDMA_OPEN_RESET); // using channel 10/11 for transfers from inbuffer 0/1 to workingbuffer hinbuff02work = EDMA_open(EDMA_CHA_TCC10, EDMA_OPEN_RESET); hinbuff12work = EDMA_open(EDMA_CHA_TCC11, EDMA_OPEN_RESET); //allocate place for the parameter table hreload0 = EDMA_allocTable(-1); hreload1 = EDMA_allocTable(-1); //checking for valid handles if( hinbuff02work != EDMA_HINV && hinbuff12work != EDMA_HINV && hrecevt0 != EDMA_HINV && hreload0 != EDMA_HINV && hreload1 != EDMA_HINV) { //fill structure for parameter table Configuration.opt = 0x28380003; // TransferCompleteCode TCC = 8, allow TCCInterrupt Configuration.src = 0x30000000; // memorymapped data receive register of MCBSP0 Configuration.dst = (Uint32)inbuffer0; Configuration.cnt = (((Uint16)BUFFERSIZE - 1) << 16) | 0x0001; Configuration.idx = 0x00000001; // set elemtent index to 1 Configuration.rld = (0x0000<<16) | (hreload1 & 0xFFFF); //link to reloadparameter //write structures to tables EDMA_config(hrecevt0, &Configuration); EDMA_config(hreload0, &Configuration); Configuration.dst = (Uint32)inbuffer1; Configuration.rld = (0x0000<<16) | (hreload0 & 0xFFFF); Configuration.opt = 0x28390003; // TransferCompleteCode TCC = 9, allow TCCInterrupt EDMA_config(hreload1, &Configuration); //setup channel to move data from inbuffer0 to workingbuffer Configuration.opt = 0x293A0001; //TCC = A, no reload, always use the same values. Sync by event Configuration.src = (Uint32)inbuffer0; Configuration.dst = (Uint32)workingbuffer; Configuration.cnt = ((Uint16)(0x0000) << 16) | BUFFERSIZE; //copy the whole chunk at once Configuration.idx = 0x00000001; // - set element index to 1 Configuration.rld = ((BUFFERSIZE - 1) << 16) | 0x0000; EDMA_config(hinbuff02work, &Configuration); //setup channel to move data from inbuffer1 to workingbuffer Configuration.src = (Uint32)inbuffer1; Configuration.opt = 0x293B0001; //TCC = B, no reload EDMA_config(hinbuff12work, &Configuration); //////////////////////////////////// //make able to generate interrupts// //////////////////////////////////// //clear pending channel interrupts EDMA_CIPR = 0xFFFF; //enable INT for channel 13(TCC 8/9), channel 10(TCC 10) und channel 11(TCC11) EDMA_CIER |= 0x00000F00; //enable event from MCBSP0 for channel 13 EDMA_EER |= 0x00002000; } else { //reset CPU? while(TRUE); } } |
EDMA looses samples
Started by ●November 10, 2003
