Autoreset on upload

diff --git a/rf433ctl/Makefile b/rf433ctl/Makefile
index 916e3fe..2b06faf 100755 (executable)
--- a/rf433ctl/Makefile
+++ b/rf433ctl/Makefile
@@ -114,7 +114,8 @@ lss: applet/$(TARGET).lss
 sym: applet/$(TARGET).sym
 
 # Program the device.  
-upload: applet/$(TARGET).hex
+upload: applet/$(TARGET).hex reset_tty
+       ./reset_tty
        $(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH)
 
 
@@ -207,4 +208,7 @@ depend:
                >> $(MAKEFILE); \
        $(CC) -M -mmcu=$(MCU) $(CDEFS) $(CINCS) $(SRC) $(ASRC) >> $(MAKEFILE)
 
+reset_tty: reset_tty.c
+       $(CC) -o reset_tty reset_tty.c
+
 .PHONY:        all build elf hex eep lss sym program coff extcoff clean depend applet_files sizebefore sizeafter

diff --git a/rf433ctl/reset_tty.c b/rf433ctl/reset_tty.c
new file mode 100644 (file)
index 0000000..bf1c0a0
--- /dev/null
+++ b/rf433ctl/reset_tty.c
@@ -0,0 +1,42 @@
+#include <stdlib.h>
+#include <termios.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <time.h>
+#include <stdio.h>
+#include <sys/select.h>
+
+#define STATE_OFF 0
+#define STATE_ON  1
+
+void setDTRState (int fd, int state) {
+  int flags;
+
+  ioctl(fd, TIOCMGET, &flags);
+  flags = (state == STATE_ON ? flags | TIOCM_DTR : flags & ~TIOCM_DTR);
+  ioctl(fd, TIOCMSET, &flags);
+}
+
+int
+main(int argc, char* argv[])
+{
+  char* device = argc < 2 ? "/dev/ttyUSB0" : argv[1];
+  int fd = open(device, O_RDWR);
+  if (fd == 0) {
+    fprintf(stderr, "Could not open %s\n", device);
+    return EXIT_FAILURE;
+  }
+  
+  setDTRState(fd, STATE_ON);
+  struct timeval sleeptime = {0, 100000}; // 100ms
+  select(0, NULL, NULL, NULL, &sleeptime);
+  setDTRState(fd, STATE_OFF);
+  sleeptime.tv_sec = 0;
+  sleeptime.tv_usec = 100000;
+  select(0, NULL, NULL, NULL, &sleeptime);
+  setDTRState(fd, STATE_ON);
+  close(fd);
+
+  return EXIT_SUCCESS;
+}
+