Merge pull request #78 from antmicro/jboc/spd-read

ZCU104: add I2C

litex_boards/platforms/zcu104.py

@@ -43,6 +43,12 @@ _io = [
         IOStandard("LVCMOS18")
     ),
 
+    ("i2c", 0,
+        Subsignal("sda", Pins("P12")),
+        Subsignal("scl", Pins("N12")),
+        IOStandard("LVCMOS33")
+    ),
+
     ("ddram", 0,
         Subsignal("a",       Pins(
             "AH16 AG14 AG15 AF15 AF16 AJ14 AH14 AF17",

litex_boards/targets/zcu104.py

@@ -16,6 +16,7 @@ from litex.soc.integration.soc_core import *
 from litex.soc.integration.soc_sdram import *
 from litex.soc.integration.builder import *
 from litex.soc.cores.led import LedChaser
+from litex.soc.cores.bitbang import I2CMaster
 
 from litedram.modules import MTA4ATF51264HZ
 from litedram.phy import usddrphy
@@ -77,6 +78,9 @@ class BaseSoC(SoCCore):
                 l2_cache_reverse        = True
             )
 
+            self.submodules.i2c = I2CMaster(platform.request("i2c"))
+            self.add_csr("i2c")
+
         # Leds -------------------------------------------------------------------------------------
         self.submodules.leds = LedChaser(
             pads         = Cat(*[platform.request("user_led", i) for i in range(4)]),