added stand alone panel for FPGA communication

panel/coreread.c

@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <linux/i2c-dev.h>
+
+typedef uint64_t word;
+typedef unsigned char uchar;
+
+void
+err(char *fmt, ...)
+{
+        va_list ap;
+        va_start(ap, fmt);
+        fprintf(stderr, "error: ");
+        vfprintf(stderr, fmt, ap);
+        fprintf(stderr, "\n");
+        va_end(ap);
+        exit(1);
+}
+
+uchar*
+puthalfword(uchar *p, word w)
+{
+	p[2] = w & 077;
+	p[1] = (w >>  6) & 077;
+	p[0] = (w >> 12) & 077;
+	return p+3;
+}
+
+int
+main()
+{
+	int i;
+	uchar msg[3+8*6], *p;
+	int fd;
+	if(fd = open("/dev/i2c-1", O_RDWR), fd < 0)
+		err("couldn't open file");
+	if(ioctl(fd, I2C_SLAVE, 0x21) < 0)
+		err("couldn't select device");
+
+	puthalfword(msg, 0000000);
+	write(fd, msg, 3);
+
+	read(fd, msg, 48+2);
+
+	for(i = 0; i < 48; i++)
+		printf("%03o ", msg[i+2]);
+	printf("\n");
+
+	close(fd);
+	
+	return 0;
+}