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Hi all, I had probs with McBSPs before, and never resolved them. Frustrated, I will attempt for help again. I did examine the example code that CCS comes with for McBSP to McBSP data transfer using a polling method, but would like to use a EDMA/McBSP interrupt config. So I am setting up for this, to get the working concept. The setup: 'int type edmaOutbuff'-> EDMA -> McBSP0 -> Tx Data to pins Everything for EDMA and McBSP is config in CSL and pre-init. The code is below, and is quite short. The prob: There is never an interrupt to trigger 'hwiEdmaIsr' function. I would expect McBSP0 to trigger ready event to EDMA then to CPU when finished each data transfer. Can anyone help me see correctly here? Thanks! Chiko **************************************************************** **************************************************************** **************************************************************** /* Skip header's Define constants */ #define TCCINTNUM 10 /* Global variables used in interrupt ISRs */ volatile int transmitted = 0; /*---------------------*/ #pragma DATA_ALIGN(edmaOutbuff,128); Uint32 edmaOutbuff; /*---------------------*/ void main() { int wait=0; //counter used for wait CSL_init(); MCBSP_enableSrgr(hMcbsp0);//Enable SRGR for (wait=0; wait<0x10; wait++); /* Wait states after SRG starts */ EDMA_clearPram(0x00000000); /* Setup & Init. interrupts*/ IRQ_nmiEnable(); IRQ_globalEnable(); IRQ_reset(IRQ_EVT_EDMAINT); //Resets Interrupt 8 @ CPU //IRQ_EVT_EDMAINT = 8 IRQ_disable(IRQ_EVT_EDMAINT); EDMA_intDisable(TCCINTNUM); //TCCINTNUM = 10 as set in EDMA config IRQ_clear(IRQ_EVT_EDMAINT); EDMA_intClear(TCCINTNUM); IRQ_enable(IRQ_EVT_EDMAINT); EDMA_intEnable(TCCINTNUM); edmaOutbuff = 0x00000000; //Data source EDMA will read from /* edmaCfg1 = edma config handle hEdmaTbl1 = PaRAM handle */ //EDMA_config(hEdmaCha12, &edmaCfg1);This is commented out b/c done in CSL //EDMA_config(hEdmaTbl1, &edmaCfg1); This is commented out b/c done in CSL //EDMA_link(hEdmaCha12, hEdmaTbl1); This is commented out b/c done in CSL EDMA_enableChannel(hEdmaCha12); /* Enable EDMA channel 12 [edmaOutbuff to DXR]*/ MCBSP_enableRcv(hMcbsp0); //Not needed I think MCBSP_enableXmt(hMcbsp0); MCBSP_enableFsync(hMcbsp0); //Not needed I think /* Wait for 1000 events created by EDMA I think*/ *********When I run prog. we are stuck here below*************** while (transmitted < 1000); /* All done now, close the port open by CSL_Init(). */ MCBSP_close(hMcbsp0); EDMA_close(hEdmaCha12); /* close TxEDMA channels */ EDMA_freeTable(hEdmaTbl1); }//End- main /*Hook this HW_INT 8 interrupt function the DSP/BIOS*/ /*Dispatcher used with default values -- is this good?? */ void hwiEdmaIsr(int arg){ if (EDMA_intTest(TCCINTNUM)) { EDMA_intClear(TCCINTNUM); edmaOutbuff++; //Data source to be written to EDMA->McBSP0 if(transmitted < 1000){ transmitted++; //Just a counter }//End- if }//End- if }//End- hwiEdmaIsr ******************************************************************* THE END |
EDMA -> McBSP0 -> Tx Data
Started by ●May 12, 2003
