PRU loading example

struct dmem_t {
        u_int32_t addr; /* r8 */
        u_int32_t size; /* r9 */
        u_int32_t fill; /* r10 */
        u_int32_t count; /* r11 */
};



int
main()
{
        unsigned int ret;
        void *extvirt;
        struct dmem_t dmem;
        tpruss_intc_initdata pruss_intc_initdata = PRUSS_INTC_INITDATA;

        prussdrv_init();


        /* Open PRU Interrupt */
        printf("Opening PRU\n");
        ret = prussdrv_open(PRU_EVTOUT_0);
        if (ret)
        {
                printf("prussdrv_open open failed\n");
                return (ret);
        }

        prussdrv_map_extmem(&extvirt);
        dmem.addr = prussdrv_get_phys_addr(extvirt);
        dmem.size = prussdrv_map_extmem_size();
        dmem.fill = 0xDEADBEEF;
        dmem.count= 4;


printf("physical=0x%08x, virtual=%p\n", dmem.addr, extvirt);

        printf("Disabling PRU0\n");
        prussdrv_pru_disable(PRU_NUM);

        ret = prussdrv_pru_write_memory(PRUSS0_PRU0_DATARAM, 0, (unsigned int *) &dmem, sizeof(dmem));

        prussdrv_pruintc_init(&pruss_intc_initdata);

        long len = sizeof(PDSPcode);
        printf("Loading %ld bytes of instructions into PRU\n", len);

        prussdrv_pru_write_memory(PRUSS0_PRU0_IRAM, 0, (unsigned int *) PDSPcode, len);


        printf("\nStarting PRU\n");
        prussdrv_pru_enable(PRU_NUM);


        printf("Press enter to generate an interrupt.\n");
        getchar();

        printf ("\tGenerate interrupt \n");
        prussdrv_pru_send_event (ARM_PRU0_INTERRUPT);

        printf("Done.\n");


        u_int32_t *ptr = (u_int32_t *) extvirt;
        int i;
        for(i=0; i<dmem.count; ++i) {
                printf("%08x ", *ptr++);
        }
        printf("\n");

        return 0;
}