build/platforms: Add TinyFPGA BX board and programmer.

litex/boards/platforms/tinyfpga_bx.py

@@ -0,0 +1,61 @@
+from litex.build.generic_platform import *
+from litex.build.lattice import LatticePlatform
+from litex.build.lattice.programmer import TinyProgProgrammer
+
+_io = [
+    ("user_led", 0, Pins("B3"), IOStandard("LVCMOS33")),
+
+    ("usb", 0,
+        Subsignal("d_p", Pins("B4")),
+        Subsignal("d_n", Pins("A4")),
+        Subsignal("pullup", Pins("A3")),
+        IOStandard("LVCMOS33")
+    ),
+
+    ("spiflash", 0,
+        Subsignal("cs_n", Pins("F7"), IOStandard("LVCMOS33")),
+        Subsignal("clk", Pins("G7"), IOStandard("LVCMOS33")),
+        Subsignal("mosi", Pins("G6"), IOStandard("LVCMOS33")),
+        Subsignal("miso", Pins("H7"), IOStandard("LVCMOS33")),
+        Subsignal("wp", Pins("H4"), IOStandard("LVCMOS33")),
+        Subsignal("hold", Pins("J8"), IOStandard("LVCMOS33"))
+    ),
+
+    ("spiflash4x", 0,
+        Subsignal("cs_n", Pins("F7"), IOStandard("LVCMOS33")),
+        Subsignal("clk", Pins("G7"), IOStandard("LVCMOS33")),
+        Subsignal("dq", Pins("G6 H7 H4 J8"), IOStandard("LVCMOS33"))
+    ),
+
+    ("clk16", 0, Pins("B2"), IOStandard("LVCMOS33"))
+]
+
+_connectors = [
+    # A2-H2, Pins 1-13
+    # H9-A6, Pins 14-24
+    # G1-J2, Pins 25-31
+    ("GPIO", "A2 A1 B1 C2 C1 D2 D1 E2 E1 G2 H1 J1 H2 H9 D9 D8 C9 A9 B8 A8 B7 A7 B6 A6"),
+    ("EXTRA", "G1 J3 J4 G9 J9 E8 J2")
+]
+
+
+# Default peripherals
+serial = [
+    ("serial", 0,
+        Subsignal("tx", Pins("GPIO:0")),
+        Subsignal("rx", Pins("GPIO:1")),
+        IOStandard("LVCMOS33")
+    )
+]
+
+
+class Platform(LatticePlatform):
+    default_clk_name = "clk16"
+    default_clk_period = 62.5
+
+    def __init__(self):
+        LatticePlatform.__init__(self, "ice40-lp8k-cm81", _io, _connectors,
+                                 toolchain="icestorm")
+
+    def create_programmer(self):
+        return TinyProgProgrammer()

litex/build/lattice/programmer.py

@@ -56,3 +56,31 @@ class TinyFpgaBProgrammer(GenericProgrammer):
     # is active, and the user image need not be reprogrammed.
     def boot(self):
         subprocess.call(["tinyfpgab", "-b"])
+
+
+# Different bootloader protocol requires different application. In the basic
+# case, command-line arguments are the same. Note that this programmer can
+# also be used with TinyFPGA B2 if you have updated its bootloader.
+class TinyProgProgrammer(GenericProgrammer):
+    needs_bitreverse = False
+
+    # You probably want to pass address="None" for this programmer
+    # unless you know what you're doing.
+    def flash(self, address, bitstream_file, user_data=False):
+        if address is None:
+            if not user_data:
+                # tinyprog looks at spi flash metadata to figure out where to
+                # program your bitstream.
+                subprocess.call(["tinyprog", "-p", bitstream_file])
+            else:
+                # Ditto with user data.
+                subprocess.call(["tinyprog", "-u", bitstream_file])
+        else:
+            # Provide override so user can program wherever they wish.
+            subprocess.call(["tinyprog", "-a", str(address), "-p",
+                            bitstream_file])
+
+    # Force user image to boot if a user reset tinyfpga, the bootloader
+    # is active, and the user image need not be reprogrammed.
+    def boot(self):
+        subprocess.call(["tinyprog", "-b"])