avm16_irqgen.c

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/ioctl.h>

#define VME_A32         0x4
#define VME_D32         0x4
#define VME_USER        0x2000
#define VME_DATA        0x8000
#define VME_SCT         0x1

struct vme_master {
	int enable;
	unsigned long long vme_addr;
	unsigned long long size;
	uint32_t aspace;
	uint32_t cycle;
	uint32_t dwidth;
} __attribute__((packed));

#define VME_IOC_MAGIC 0xAE
#define VME_SET_MASTER _IOW(VME_IOC_MAGIC, 4, struct vme_master)

int main(void)
{
	struct vme_master master;
	int fd, rc;

	fd = open("/dev/bus/vme/m2", O_RDWR);
	if (fd == -1) {
	    perror("FATAL - can not open VME");
	    return EXIT_FAILURE;
	}

	master.enable = 1;
	master.vme_addr = 0xc0000000;
	master.size = 0x20000;
	master.aspace = VME_A32;
	master.cycle = VME_USER | VME_DATA | VME_SCT;
	master.dwidth = VME_D32;

	rc = ioctl(fd, VME_SET_MASTER, &master);
	if (rc != 0) {
		perror("FATAL - can not setup VME window");
		return EXIT_FAILURE;
	}

#define AM16_REG_WRITE(offset, value) \
	do { \
		uint32_t _value = htonl(value); \
		int rc = pwrite(fd, &_value, sizeof(_value), offset); \
		if (rc < sizeof(_value)) \
			perror("write"); \
	} while(0)

	AM16_REG_WRITE(0x104, 0x1); // Do master reset
	AM16_REG_WRITE(0x100, 0x1); // Enable board
	AM16_REG_WRITE(0x8, 0x6b01); // Use interrupt vector 0x6b, level 1
	AM16_REG_WRITE(0x104, 0x4); // Fire software trigger
	printf("Fired a VME interrupt. Sleeping...\n");
	sleep(5);
	printf("Disabling the board\n");
	AM16_REG_WRITE(0x100, 0x0); // Disable board
	AM16_REG_WRITE(0x104, 0x1); // Do master reset

	close(fd);
	return EXIT_SUCCESS;
}