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Programming Examples

6-42 ADSP-21368 SHARC Processor Hardware Reference

/* Application code */

.global _main;

.segment/pm seg_pmco;

_main:

/* Init SPI MASTER TX DMA */

r0 = 0;

dm(SPICTL) = r0;

dm(SPIFLG) = r0;

dm(SPIDMAC) = r0;

r0 = DS0EN;

dm(SPIFLG) = r0; /*use flag0 as spi device select */

ustat3 = src_buf; dm(IISPI) = ustat3; /* point to 'src_buf'*/

ustat3 = LENGTH(src_buf); dm(CSPI) = ustat3; /* count = 256 */

ustat3 = 1; dm(IMSPI) = ustat3; /* step size = 1 */

/* set the SPI baud rate to CCLK/8*64 (650.39KHz @ 333MHz)*/

ustat3 = 0x80;

dm(SPIBAUD) = ustat3;

ustat3 = DMISO| /* Disable MISO on transfers */

WL32| /* 32-bit words */

SPIMS| /* Master mode (internal SPICLK) */

SPIEN| /* Enable SPI port */

TIMOD2; /* Initialize SPI port to begin

transmitting when DMA is enabled */

dm(SPICTL) = ustat3;

ustat3 = SPIDEN; dm(SPIDMAC) = ustat3; /* begin DMA */

/*========================================================*/

_main.end: jump (pc,0);

Analog Devices SHARC ADSP-21368 User Manual

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