add PC side code

git-svn-id: https://bucket.mit.edu/svn/nilm/zoom@4368 ddd99763-3ecb-0310-9145-efcb8ce7c51f

testdac/pc/Makefile

@@ -0,0 +1,6 @@
+.PHONY: clean all
+
+all : setdac
+
+clean : 
+	rm -f setdac

testdac/pc/setdac.c

@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <termio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <err.h>
+#include <sys/poll.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <string.h>
+#include <stdint.h>
+
+int main(int argc, char *argv[])
+{
+	int baudrate=B9600;
+	int fd_serial;
+	struct termios options;
+	FILE *s;
+	int val;
+	uint8_t c;
+	
+	if (argc != 3) {
+		fprintf(stderr,"usage: %s device value\n", *argv);
+		fprintf(stderr,"   ex: %s /dev/ttyS0 123\n", *argv);
+		exit(1);
+	} 
+
+	val = atoi(argv[2]);
+	if (val < 0 || val > 255)
+		errx(1, "bad value: %s", argv[2]);
+
+	if ((fd_serial = open(argv[1], O_RDWR|O_NOCTTY)) == -1)
+		err(1, "serial device %s", argv[1]);
+
+	fcntl(fd_serial, F_SETFL, 0);
+	tcgetattr(fd_serial, &options);
+	cfsetispeed(&options, baudrate);
+	cfsetospeed(&options, baudrate);
+	options.c_cflag |= (CLOCAL | CREAD);
+	options.c_cflag &= ~PARENB;
+	options.c_cflag |= CSTOPB;
+	options.c_cflag &= ~CSIZE;
+	options.c_cflag |= CS8;
+	options.c_cflag &= ~CRTSCTS;
+	options.c_oflag &= ~OPOST;
+	if (tcsetattr(fd_serial, TCSANOW, &options) != 0)
+		err(1, "setting serial device parameters");
+
+	c = val;
+	printf("Sending byte 0x%02x\n", c);
+	write(fd_serial, &c, 1);
+
+	close(fd_serial);
+	return 0;
+}