From be6ab940ff1dd6b64845ae54c2cc392c6b964334 Mon Sep 17 00:00:00 2001
From: Aadi Desai <21363892+supleed2@users.noreply.github.com>
Date: Sat, 10 Jun 2023 14:06:09 +0100
Subject: [PATCH] Add interrupt output to `can` wrapper

---
 make.py    | 1 +
 testCAN.py | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/make.py b/make.py
index df2661e..6eafff8 100755
--- a/make.py
+++ b/make.py
@@ -233,6 +233,7 @@ class BaseSoC(SoCCore):
             platform = platform,
             pads     = platform.request("can")
         )
+        self.irq.add("can", use_loc_if_exists=True)
 
         # DAC Control / Audio Blocks ---------------------------------------------------------------
         from testWave import TestWave
diff --git a/testCAN.py b/testCAN.py
index 1465aa2..517849a 100644
--- a/testCAN.py
+++ b/testCAN.py
@@ -1,6 +1,7 @@
 from migen import *
 
 from litex.soc.interconnect.csr import *
+from litex.soc.interconnect.csr_eventmanager import EventManager, EventSourcePulse
 from litex.soc.integration.doc import ModuleDoc
 
 # CAN Receiver Module ------------------------------------------------------------------------------
@@ -27,11 +28,18 @@ class CanReceiver(Module, AutoCSR, ModuleDoc):
         self.rcv_data5 = CSRStatus(size = 8, description = "Received message data byte 5")
         self.rcv_data6 = CSRStatus(size = 8, description = "Received message data byte 6")
         self.rcv_data7 = CSRStatus(size = 8, description = "Received message data byte 7")
+        self.rcv_pulse = Signal()
 
         # Pin Connections
         self.can_rx = Signal()
         self.can_tx = Signal()
 
+        # Interrupts
+        self.submodules.ev = EventManager()
+        self.ev.frame = EventSourcePulse(description = "CAN frame received, sets pending bit")
+        self.ev.finalize()
+        self.comb += self.ev.frame.trigger.eq(self.rcv_pulse)
+
         # # #
 
         self.specials += Instance("can",
@@ -50,6 +58,7 @@ class CanReceiver(Module, AutoCSR, ModuleDoc):
             o_o_data5 = self.rcv_data5.status,
             o_o_data6 = self.rcv_data6.status,
             o_o_data7 = self.rcv_data7.status,
+            o_o_pulse = self.rcv_pulse,
         )
 
         self.comb += self.can_rx.eq(self.pads.rx)