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diff --git a/tools/platforms/msp430/pybsl/cp210x_rt/cp210xrtmodule.c b/tools/platforms/msp430/pybsl/cp210x_rt/cp210xrtmodule.c
new file mode 100644
index 00000000..17c046f8
--- /dev/null
+++ b/tools/platforms/msp430/pybsl/cp210x_rt/cp210xrtmodule.c
@@ -0,0 +1,91 @@
+/* Copyright (c) 2006-2007 by Sporian Microsystems, Inc.
+ * All Rights Reserved.
+ *
+ * This document is the proprietary and confidential property of Sporian
+ * Microsystems, Inc.  All use, distribution, reproduction or re-distribution
+ * is disallowed without the prior express written consent of Sporian
+ * Microsystems, Inc.
+ */
+
+#include <Python.h>
+#include <windows.h>
+#include <io.h>
+#include <dlfcn.h>
+#include "CP210xRuntimeDLL.h"
+
+typedef CP210xRUNTIMEDLL_API CP210x_STATUS WINAPI (*fn_t)(HANDLE, BYTE, BYTE);
+
+void* dll;
+fn_t writeLatch;
+PyObject* exception;
+
+
+static PyObject* cp210xrt_writeLatch(PyObject* self, PyObject* args)
+{
+    int fd;
+    BYTE bMask;
+    BYTE bData;
+    HANDLE hDevice;
+    CP210x_STATUS ret;
+
+    if (!PyArg_ParseTuple(args, "iBB", &fd, &bMask, &bData))
+        return NULL;
+    if (!writeLatch) {
+	PyErr_SetString(exception, "No access to CP210xRuntime.dll");
+	return NULL;
+    }
+
+    hDevice = (HANDLE)get_osfhandle(fd);
+    if (hDevice == INVALID_HANDLE_VALUE)
+    {
+	PyErr_SetString(exception, "No access to device");
+	return NULL;
+    }
+
+    /* If we don't call writeLatch, then we don't core dump when we return to
+     * the python caller.  If we do call writeLatch, the latches are set, but
+     * when we return return into python, perhaps the stack has been corrupted
+     * somehow.  We get a stackdump from cygwin.
+     *
+     * Note: when we opened the handle here, via CreateFile(), then closed it
+     * before returning, we had no problems.
+     */
+    ret = writeLatch(hDevice, bMask, bData);
+    if (ret != CP210x_SUCCESS) {
+	PyErr_SetString(exception, "IO Error with device");
+	return NULL;
+    }
+
+#if 1
+    Py_INCREF(Py_None);
+    return Py_None;
+#else
+    return Py_BuildValue("i", ret);
+#endif
+}
+
+
+static PyMethodDef cp210xrtMethods[] = {
+    { "writeLatch", cp210xrt_writeLatch, METH_VARARGS, "Set GPIO bits" },
+    { NULL, NULL, 0, NULL }
+};
+
+
+PyMODINIT_FUNC initcp210xrt(void)
+{
+    PyObject* m = Py_InitModule("cp210xrt", cp210xrtMethods);
+    exception = PyErr_NewException("cp210xrt.error", NULL, NULL);
+    Py_INCREF(exception);
+    PyModule_AddObject(m, "error", exception);
+
+    if (!dll) {
+	dll = dlopen("CP210xRuntime.dll", RTLD_NOW);
+	if (dll) {
+	    dlerror();
+	    writeLatch = (fn_t)dlsym(dll, "CP210xRT_WriteLatch");
+	    if (dlerror())
+		writeLatch = NULL;
+	}
+    }
+}
+