From 2fa58b6e4059e43062c74e7078766993bf57896c Mon Sep 17 00:00:00 2001
From: Holger Hans Peter Freyther <holger@freyther.de>
Date: Wed, 25 Apr 2012 21:53:41 +0200
Subject: [PATCH] sysmobts_v2: Add code that might or might switch the board
 into ubl mode

---
 src/main.c   | 14 ++++++++++++++
 src/serial.c | 25 +++++++++++++++++++++++++
 src/serial.h |  6 ++++++
 3 files changed, 45 insertions(+)

diff --git a/src/main.c b/src/main.c
index ef99bfa..f45dab4 100644
--- a/src/main.c
+++ b/src/main.c
@@ -338,6 +338,15 @@ main(int argc, char *argv[])
 	if (ret)
 		return ret;
 
+	/* Put the board in UART boot and reset it */
+	set_rts(0);
+	set_dtr(1);
+	usleep(500 * 1000);
+	set_rts(1);
+	usleep(500 * 1000);
+	set_rts(0);
+	usleep(500 * 1000);
+
 	/* Wait for the device to send the BOOTME sequence.
 	 * If the UBL is already running, it will send BOOTPSP. */
 	found = wait_for_message("BOOTME", "BOOTPSP", NULL);
@@ -412,6 +421,11 @@ main(int argc, char *argv[])
 	ret = 0;
 
 end:
+	set_dtr(0);
+	set_rts(1);
+	usleep(100 * 1000);
+	set_rts(0);
+	
 	/* Close serial port. */
 	serial_port_close();
 	return ret;
diff --git a/src/serial.c b/src/serial.c
index 2670c92..d871e6a 100644
--- a/src/serial.c
+++ b/src/serial.c
@@ -31,6 +31,7 @@
 #include <ctype.h>   /* For isdigit() and friends... */
 #include <sys/time.h>
 #include <sys/wait.h>
+#include <sys/ioctl.h>
 
 #include "common.h"
 #include "serial.h"
@@ -192,6 +193,30 @@ serial_port_close(void)
 	}
 }
 
+int
+set_dtr(int dtr)
+{
+	int status;
+
+	ioctl(serial_port.fd, TIOCMGET, &status);
+	if (dtr) status &= ~TIOCM_DTR;
+	else     status |=  TIOCM_DTR; 
+	ioctl(serial_port.fd, TIOCMSET, &status);
+	return EXIT_SUCCESS;
+}	
+
+int
+set_rts(int rts)
+{
+	int status;
+	
+	ioctl(serial_port.fd, TIOCMGET, &status);
+	if (rts) status &= ~TIOCM_RTS;
+	else     status |=  TIOCM_RTS; 
+	ioctl(serial_port.fd, TIOCMSET, &status);
+	return EXIT_SUCCESS;
+}
+	
 int
 send_message(const char *msg)
 {
diff --git a/src/serial.h b/src/serial.h
index 6cafb28..f6baa0e 100644
--- a/src/serial.h
+++ b/src/serial.h
@@ -30,6 +30,12 @@ serial_port_open(const char *port, const int baud_rate_index);
 void
 serial_port_close(void);
 
+int
+set_dtr(int dtr);
+
+int
+set_rts(int rts);
+
 int
 send_message(const char *msg);