use new Migen sel signal to change the way we upload data (will enable fifo bursts)

litescope/core/storage.py

@@ -97,6 +97,7 @@ class LiteScopeRecorderUnit(Module):
 		self.post_hit = Signal()
 
 		self.source = Source(data_layout(dw))
+		self.source_level = Signal(bits_for(depth))
 
 		###
 
@@ -137,6 +138,7 @@ class LiteScopeRecorderUnit(Module):
 
 			If(~fifo.sink.ack | (fifo.fifo.level >= self.length), NextState("IDLE"))
 		)
+		self.comb += self.source_level.eq(fifo.fifo.level)
 
 class LiteScopeRecorder(LiteScopeRecorderUnit, AutoCSR):
 	def __init__(self, dw, depth):
@@ -149,7 +151,7 @@ class LiteScopeRecorder(LiteScopeRecorderUnit, AutoCSR):
 		self._done = CSRStatus()
 
 		self._source_stb = CSRStatus()
-		self._source_ack = CSR()
+		self._source_level = CSRStatus(bits_for(depth))
 		self._source_data = CSRStatus(dw)
 
 		###
@@ -162,6 +164,7 @@ class LiteScopeRecorder(LiteScopeRecorderUnit, AutoCSR):
 			self._done.status.eq(self.done),
 
 			self._source_stb.status.eq(self.source.stb),
+			self._source_level.status.eq(self.source_level),
 			self._source_data.status.eq(self.source.data),
-			self.source.ack.eq(self._source_ack.re)
+			self.source.ack.eq(self._source_data.sel),
 		]

litescope/host/driver/la.py

@@ -111,9 +111,8 @@ class LiteScopeLADriver():
 	def upload(self):
 		if self.debug:
 			print("uploading")
-		while self.recorder_source_stb.read():
+		while self.recorder_source_level.read():
 			self.data.append(self.recorder_source_data.read())
-			self.recorder_source_ack.write(1)
 		if self.with_rle:
 			if self.rle_enable.read():
 				self.data = self.data.decode_rle()

test/test_la.py

@@ -9,7 +9,7 @@ la = LiteScopeLADriver(wb.regs, "la", debug=True)
 cond = {} # trigger on cnt0 = 128
 la.configure_term(port=0, cond=cond)
 la.configure_sum("term")
-la.configure_subsampler(8)
+la.configure_subsampler(1)
 #la.configure_qualifier(1)
 la.configure_rle(1)
 la.run(offset=128, length=256)