Dear All, I have a small problem. I am trying to play a wave file from my SD card. I am not using FAT i am just reading raw data from the card.
I want to do this using DMA transfer.
I wrote the following code, but this does not output the wave file from the DAC.
Does anyone have any idea, what i should do?
Best Regards Kerem
#include #include #include #include #include #include //__no_init volatile unsigned long DMA0SZ @ DMA0SZ_;
unsigned long cardSize = 0; unsigned char status = 1; unsigned int timeout = 0; int i = 0; int k= 0; int kerem = 0; int filesize = 0; int* filePtr = NULL; int sector = 0;
unsigned char buffer[512];
void main(void) { WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer DCOCTL = CALDCO_16MHZ; BCSCTL1 = CALBC1_16MHZ; BCSCTL2 = SELM_0 | DIVS_2; //P1DIR |= 0x01; // Set P1.0 to output direction
P1DIR = BIT0 | BIT4; // Set P1.0 to output direction
P2DIR = BIT0 ; P5DIR = BIT4 | BIT5; P1SEL = BIT4; P2SEL = BIT0; P5SEL = BIT4 | BIT5; P6DIR = BIT6 ; P6SEL = BIT6; ADC12CTL0 = REFON; DAC12_0CTL = DAC12SREF_0 | DAC12RES | DAC12LSEL_2 | DAC12IR | DAC12AMP_7 | DAC12CALON;
while (DAC12_0CTL & DAC12CALON != 0){ } DMACTL0 =DMA0TSEL_5; DMACTL1 = 0;
DMA0CTL = DMADT_0 | DMADSTINCR_0 | DMASRCINCR_3 | DMADSTBYTE | DMASRCBYTE;
//Initialisation of the MMC/SD-card while (status != 0) // if return in not NULL an error did occur and the
// MMC/SD-card will be initialized again
{ status = mmcInit(); timeout++; if (timeout == 150) // Try 50 times till error { //printf ("No MMC/SD-card found!! %x\n", status); break; } }
while ((mmcPing() != MMC_SUCCESS)); // Wait till card is inserted
// Read the Card Size from the CSD Register cardSize = mmcReadCardSize(); mmcReadSector(sector, buffer); __data16_write_addr((unsigned short) &DMA0SA,(unsigned long) buffer
+44);
// Source block address __data16_write_addr((unsigned short) &DMA0DA,(unsigned long) &DAC12_0DAT);
DMA0SZ = 64; TACCR0 = 1; TACCR1 = 1; TACCTL1 = OUTMOD_7; DMA0CTL = DMA0CTL | DMAEN | DMAIE; DAC12_0CTL = DAC12_0CTL | DAC12ENC | DAC12IFG ;
TACTL = TASSEL_1 | ID_0 | MC_1 | TACLR;
__enable_interrupt(); for (;;) {
P1OUT ^= 0x01; // Toggle P1.0 using exclusive-OR
i = 50000; // Delay do (i--); while (i != 0); } } #pragma vector = DMA_VECTOR __interrupt void DMA_int(void) {
sector++; mmcReadSector(sector, buffer); __data16_write_addr((unsigned short) &DMA0SA,(unsigned long) buffer); //__data16_write_addr((unsigned short) &DMA0SA,(unsigned long) wave); // Source block address __data16_write_addr((unsigned short) &DMA0DA,(unsigned long) &DAC12_0DAT);
DMA0SZ = 512; DMA0CTL |= DMAEN | DMAIE;
DAC12_0CTL = DAC12_0CTL | DAC12ENC | DAC12IFG ; }
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