Merge pull request #87 from antmicro/arty_i2s

arty: Add configuration of I2S pins

litex_boards/platforms/arty.py

@@ -145,6 +145,25 @@ _io = [
     ),
 ]
 
+_i2s_pmod_io = [
+    # I2S PMOD on JD:
+    # - https://store.digilentinc.com/pmod-i2s2-stereo-audio-input-and-output/ 
+    ("i2s_rx_mclk", 0, Pins("E2"), IOStandard("LVCMOS33")),
+    ("i2s_rx", 0,
+        Subsignal("clk", Pins("H2")),
+        Subsignal("sync", Pins("D2")),
+        Subsignal("rx", Pins("G2")),
+        IOStandard("LVCMOS33"),
+    ),
+    ("i2s_tx_mclk", 0, Pins("D4"), IOStandard("LVCMOS33")),
+    ("i2s_tx", 0,
+        Subsignal("clk",Pins("F4")),
+        Subsignal("sync", Pins("D3")),
+        Subsignal("tx", Pins("F3")),
+        IOStandard("LVCMOS33"),
+    ),
+]
+
 _sdcard_pmod_io = [
     # SDCard PMOD on JD:
     # - https://store.digilentinc.com/pmod-microsd-microsd-card-slot/