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

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This commit is contained in:
Florent Kermarrec 2015-02-19 11:14:31 +01:00
parent 8e0553670a
commit e495e2f537
1 changed files with 18 additions and 3 deletions
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21
litescope/host/driver/la.py
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@ -5,12 +5,21 @@ from litescope.host.dump import *
from litescope.host.driver.truthtable import * from litescope.host.driver.truthtable import *
class LiteScopeLADriver(): 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.regs = regs
self.name = name self.name = name
self.debug = debug
if config_csv is None: if config_csv is None:
self.config_csv = name + ".csv" 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_config()
self.get_layout() self.get_layout()
self.build() self.build()
@ -78,6 +87,10 @@ class LiteScopeLADriver():
def configure_subsampler(self, n): def configure_subsampler(self, n):
self.subsampler_value.write(n-1) 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): def configure_qualifier(self, v):
self.recorder_qualifier.write(v) self.recorder_qualifier.write(v)
@ -121,7 +134,9 @@ class LiteScopeLADriver():
dump = PythonDump() dump = PythonDump()
elif ext == ".sr": elif ext == ".sr":
from litescope.host.dump.sigrok import SigrokDump 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: else:
raise NotImplementedError raise NotImplementedError
dump.add_from_layout(self.layout, self.data) dump.add_from_layout(self.layout, self.data)