From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Sat, 25 Aug 2012 19:53:06 +0000 (+0200)
Subject: add sim: tb_Spi2Csr.py (skeleton, WIP)
X-Git-Tag: 24jan2021_ls180~2575^2~170
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b5a44f2e982fb66f98cb7d4d28356f140b9d39d6;p=litex.git

add sim: tb_Spi2Csr.py (skeleton, WIP)
---

diff --git a/sim/tb_TriggerCsr.py b/sim/tb_TriggerCsr.py
index 5e7ff9d9..6990b6c2 100644
--- a/sim/tb_TriggerCsr.py
+++ b/sim/tb_TriggerCsr.py
@@ -21,7 +21,7 @@ def sum_prog(off, addr, dat):
 	yield TWrite(off+1, we+dat)
 	yield TWrite(off+0, 0)
 	for i in range(4):
-		TWrite(off+i,0)
+		yield TWrite(off+i,0)
 
 
 csr_done = False
@@ -84,7 +84,7 @@ def main():
 	fragment = autofragment.from_local()
 	fragment += Fragment(sim=[end_simulation])
 	fragment += Fragment(sim=[term_stimuli])
-	sim = Simulator(fragment, Runner(),TopLevel("myvcd"))
+	sim = Simulator(fragment, Runner(),TopLevel("tb_TriggerCsr.vcd"))
 	sim.run(2000)
 
 main()
diff --git a/sim/tb_spi2Csr.py b/sim/tb_spi2Csr.py
index 914a2b08..1750b59d 100644
--- a/sim/tb_spi2Csr.py
+++ b/sim/tb_spi2Csr.py
@@ -1,9 +1,110 @@
 from migen.fhdl.structure import *
 from migen.fhdl import verilog, autofragment
+from migen.bus import csr
+from migen.sim.generic import Simulator, PureSimulable, TopLevel
+from migen.sim.icarus import Runner
+from migen.bus.transactions import *
+from migen.bank import description, csrgen
+from migen.bank.description import *
 
 import sys
 sys.path.append("../")
 import spi2Csr
 
+def get_bit(dat, bit):
+	return int(dat & (1<<bit) != 0)
 
-spi2csr0 = spi2Csr.Spi2Csr(16,8)
+def spi_transactions():
+	yield TWrite(0xA5A5,1)
+	yield TWrite(0x5A5A,2)
+	yield TWrite(0xA5A5,3)
+	yield TWrite(0x5A5A,4)
+
+class SpiMaster(PureSimulable):
+	def __init__(self, spi, generator):
+		self.spi = spi
+		self.generator = generator
+		self.transaction_start = 0
+		self.transaction = None
+		self.done = False
+	
+	def do_simulation(self, s):
+		a_w = self.spi.a_width
+		d_w = self.spi.d_width
+
+		if not self.done:
+			if self.transaction is None:
+				try:
+					self.transaction = next(self.generator)
+				except StopIteration:
+					self.done = True
+					self.transaction = None
+				if self.transaction is not None:
+					self.transaction_cnt = 0			
+			elif isinstance(self.transaction,TWrite):	
+			
+					# Clk
+					if self.transaction_cnt%2:
+						s.wr(self.spi.spi_clk,1)
+					else:
+						s.wr(self.spi.spi_clk,0)
+
+					# Mosi Addr
+					if self.transaction_cnt < a_w*2-1:	
+						bit = a_w-1-int((self.transaction_cnt)/2)					
+						data = get_bit(self.transaction.address,bit)
+						s.wr(self.spi.spi_mosi,data)
+
+					# Mosi Data
+					if self.transaction_cnt > a_w*2 and self.transaction_cnt < a_w*2+d_w*2-1:	
+						bit = d_w-1-int((self.transaction_cnt-a_w*2)/2)					
+						data = get_bit(self.transaction.data,bit)
+						s.wr(self.spi.spi_mosi,data)					
+
+
+					# Cs_n
+					if self.transaction_cnt < a_w*2+d_w*2:
+						s.wr(self.spi.spi_cs_n,0)
+					else:
+						s.wr(self.spi.spi_cs_n,1)
+						s.wr(self.spi.spi_clk,0)
+						s.wr(self.spi.spi_mosi,0)
+						self.transaction = None
+
+					# Incr transaction_cnt
+					self.transaction_cnt +=1
+
+def main():
+	# Csr Slave
+	scratch_reg0 = RegisterField("scratch_reg0", 32, reset=0,access_dev=READ_ONLY)
+	scratch_reg1 = RegisterField("scratch_reg1", 32, reset=0,access_dev=READ_ONLY)
+	scratch_reg2 = RegisterField("scratch_reg3", 32, reset=0,access_dev=READ_ONLY)
+	scratch_reg3 = RegisterField("scratch_reg4", 32, reset=0,access_dev=READ_ONLY)
+	regs = [scratch_reg0,scratch_reg1,scratch_reg2,scratch_reg3]
+	bank0 = csrgen.Bank([scratch_reg0,],address=0x0000)
+
+	# Spi2Csr
+	spi2csr0 = spi2Csr.Spi2Csr(16,8)
+
+
+	# Csr Interconnect
+	csrcon0 = csr.Interconnect(spi2csr0.csr, 
+			[
+				bank0.interface
+			])
+	
+	# Spi Master
+	spi_master0 = SpiMaster(spi2csr0,spi_transactions())
+
+	# Simulation
+	def end_simulation(s):
+		s.interrupt = spi_master0.done
+
+
+	fragment = autofragment.from_local()
+	fragment += Fragment(sim=[end_simulation])
+	sim = Simulator(fragment, Runner(),TopLevel("tb_spi2Csr.vcd"))
+	sim.run(1000)
+
+main()
+input()