How do I configure a DMA to trigger the INTMAJOR interrupt on the completion of a major loop?
I am using MQX RTOS on a k60f120 board through CodeWarrior.
void dma_ch1_isr( void *user_isr_ptr){ DMA_CINT = DMA_CINT_CINT(0);}
uint16_t dma_dst[16] = {0};
uint16_t dma_src[16] = {0xF, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xA};
_int_install_isr(16, dma_ch1_isr, NULL);
_bsp_int_init(16, 3, 0, TRUE);
DMAMUX0_CHCFG0 = 0;//use software trigger
DMAMUX1_CHCFG0 = 0;
DMA_TCD0_SADDR = (uint32) &dma_src[0];//source address
DMA_TCD0_SOFF = 2; //src addr ubcr
DMA_TCD0_SLAST = 0; //minor loop end decr
DMA_TCD0_DADDR = &dma_dst[0]; //dest address
DMA_TCD0_DOFF = 2; //dest addr incr
DMA_TCD0_DLASTSGA = 0; //minor loop end decr
DMA_TCD0_NBYTES_MLNO = 8; //transfer 4 words
DMA_TCD0_BITER_ELINKNO = 1;//one major loop iteration
DMA_TCD0_CITER_ELINKNO = 1;
DMA_TCD0_ATTR = DMA_ATTR_SSIZE(1) | DMA_ATTR_DSIZE(1);
DMA_TCD0_CSR = DMA_CSR_INTMAJOR_MASK; //interrupt after major loop ends
DMA_SSRT = DMA_SSRT_SSRT(0);//start DMA
while(!(DMA_TCD0_CSR & DMA_CSR_DONE_MASK)){}//wait for DMA
The data transfer is successful if the DMA_CSR_INTMAJOR bit is not set. The program hangs to "_mqx_idle_task" when the SSRT start bit is set if the DMA_CSR_INTMAJOR bit is set.
Any ideas on what I am doing wrong or a different approach I could use? If anyone can tell me how to format code blocks in these discussion things, I would appreciate that too.
