add libs

lib_uart/tests/uart_clock_device.py

@@ -0,0 +1,27 @@
+import xmostest
+
+class UARTClockDevice(xmostest.SimThread):
+    def __init__(self, clock_port, clock_frequency):
+        """
+        Create a clock input to a given port for the XCore.
+
+        :param: clock_port        Port to clock
+        :param: clock_frequency   Frequency in Hz of the clock
+        """
+        self._clock_port = clock_port
+        self._clock_frequency = clock_frequency
+
+    def run(self):
+        xsi = self.xsi
+        time = xsi.get_time()
+
+        # (1s/(freq))/2 = T for 1 edge. 1s = 1e9ns, 0.5s = 5e8ns
+        half_period_ns = float(5e8) / self._clock_frequency
+        while True:
+            xsi.drive_port_pins(self._clock_port, 1)
+            self.wait_until(time + half_period_ns)
+            time += half_period_ns
+
+            xsi.drive_port_pins(self._clock_port, 0)
+            self.wait_until(time + half_period_ns)
+            time += half_period_ns