diff --git a/app/Makefile b/app/Makefile
index f16ddf0..9e26200 100644
--- a/app/Makefile
+++ b/app/Makefile
@@ -4,6 +4,7 @@ CFLAGS := -c -Wall -Werror
 INCLUDES := -I.
 
 EXECUTABLE = \
+	write-memory \
 	read-memory \
 	test-cfg
 
@@ -16,6 +17,10 @@ all : $(EXECUTABLE)
 	$(CC) $(INCLUDES) $(CFLAGS) $< -o $@
 
 
+write-memory : write-memory.o
+	$(CC) $< -o $@ $(LDFLAGS)
+
+
 read-memory : read-memory.o
 	$(CC) $< -o $@ $(LDFLAGS)
 
diff --git a/app/write-memory.c b/app/write-memory.c
new file mode 100644
index 0000000..c8424ee
--- /dev/null
+++ b/app/write-memory.c
@@ -0,0 +1,82 @@
+#include <interface.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+
+enum cfg_regsiters {
+	CFG_AXIS_ADDR,
+	CFG_AXIS_DATA,
+	CFG_HP0_DST_CNT,
+	CFG_HP0_SRC_CNT,
+	CFG_HP0_DST_DATA,
+	CFG_HP0_SRC_DATA,
+	CFG_EMPTY,
+};
+
+int main(int argc, char *argv[])
+{
+	int i = 0;
+
+	if (axis_init("/dev/axis") != 0) {
+		return -1;
+	}
+
+	if (argc < 2) {
+		printf("Usage: %s <length>\n", argv[0]);
+		return 0;
+	}
+
+	off_t offset = 0x1b900000;
+	size_t len = atoi(argv[1]);
+	printf("phys_addr: %ld, %02x, length: %ld\n", (long int)offset,
+	       (unsigned int)offset, (long int)len);
+
+	int fd = open("/dev/mem", O_SYNC);
+	unsigned int *mem =
+	    (unsigned int *)mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_PRIVATE,
+				 fd, offset);
+
+	if (mem == NULL) {
+		printf("Can't map memory\n");
+		return -2;
+	}
+
+	// configure axis to write to memory
+	printf("config start\n");
+	cfg_write(CFG_AXIS_ADDR, 2);
+	cfg_write(CFG_AXIS_DATA, offset);
+	cfg_write(CFG_AXIS_DATA, len);
+	printf("config done\n");
+
+	// send data to be written over cfg bus
+	printf("write start\n");
+	for (i = 0; i < len; ++i) {
+		cfg_write(CFG_HP0_DST_DATA, i + 1);
+		//cfg_write(CFG_HP0_DST_DATA, 0);
+	}
+	printf("hp0 dst cnt: %d\n", cfg_read(CFG_HP0_DST_CNT));
+	printf("write done\n");
+
+	// check memory for data
+	for (i = 0; i < len; ++i) {
+		printf("%6d, %10ld, %02x, hex: %x,\tbinary: %d\n", i + 1,
+		       (offset + (sizeof(mem[0]) * i)),
+		       (unsigned int)(offset + (sizeof(mem[0]) * i)),
+		       (int)mem[i], (int)mem[i]);
+	}
+
+	if (munmap(mem, len) < 0) {
+		printf("Can't unmap memory\n");
+		return -3;
+	}
+
+	if (axis_exit() != 0) {
+		return -1;
+	}
+
+	printf("\ndone\n");
+
+	return 0;
+}