the downloader now sends a reset pulse an asserts TxD low before sending 'identify'

git-svn-id: https://svn.spreadspace.org/pic/trunk@91 a09c6847-51d9-44de-8ef2-e725cf50f3c7

1 files changed, 7 insertions, 0 deletions

diff --git a/bootloader/downloader.py b/bootloader/downloader.py
index cff9865..12e9644 100755
--- a/bootloader/downloader.py
+++ b/bootloader/downloader.py
@@ -87,6 +87,7 @@ def create_flash_segments(hexdata, fs, fss):
 
 def open_serial(device, baud):
     import serial
+    import time
 
     print >> sys.stderr,  "opening %s (%s Baud)" % (device, baud)
 
@@ -94,6 +95,12 @@ def open_serial(device, baud):
         dev = serial.Serial(port=device, baudrate=baud, timeout=3)
         dev.flushInput()
         dev.flushOutput()
+        dev.setDTR(True)    # send a reset pulse
+        dev.setBreak(True)  # boot into bootloader
+        time.sleep(0.1)
+        dev.setDTR(False)
+        time.sleep(0.01)
+        dev.setBreak(False)
         return dev
 
     except (ValueError, serial.SerialException), msg: