driver/la: add samplerate computation (required by sigrok export)

diff --git a/litescope/host/driver/la.py b/litescope/host/driver/la.py
index 083805effd5de95430e7dc560d047a720ff74c11..a60d5d726aec855f25725a7e69c1aad17a2edd13 100644 (file)
--- a/litescope/host/driver/la.py
+++ b/litescope/host/driver/la.py
@@ -5,12 +5,21 @@ from litescope.host.dump import *
 from litescope.host.driver.truthtable import *
 
 class LiteScopeLADriver():
-       def __init__(self, regs, name, config_csv=None, debug=False):
+       def __init__(self, regs, name, config_csv=None, clk_freq=None, debug=False):
                self.regs = regs
                self.name = name
-               self.debug = debug
                if config_csv is None:
                        self.config_csv = name + ".csv"
+               if clk_freq is None:
+                       try:
+                               self.clk_freq = regs.identifier_frequency.read()
+                       except:
+                               self.clk_freq = None
+                       self.samplerate = self.clk_freq
+               else:
+                       self.clk_freq = clk_freq
+                       self.samplerate = clk_freq
+               self.debug = debug
                self.get_config()
                self.get_layout()
                self.build()
@@ -78,6 +87,10 @@ class LiteScopeLADriver():
 
        def configure_subsampler(self, n):
                self.subsampler_value.write(n-1)
+               if self.clk_freq is not None:
+                       self.samplerate = self.clk_freq//n
+               else:
+                       self.samplerate = None
 
        def configure_qualifier(self, v):
                self.recorder_qualifier.write(v)
@@ -121,7 +134,9 @@ class LiteScopeLADriver():
                        dump = PythonDump()
                elif ext == ".sr":
                        from litescope.host.dump.sigrok import SigrokDump
-                       dump = SigrokDump()
+                       if self.samplerate is None:
+                               raise ValueError("Unable to automatically retrieve clk_freq, clk_freq parameter required")
+                       dump = SigrokDump(samplerate=self.samplerate)
                else:
                        raise NotImplementedError
                dump.add_from_layout(self.layout, self.data)