add DSL FPGA workshop materials

dsl_fpga_workshop/fm_transmitter_your_name_here.py

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+from migen.fhdl.std import *
+from mibuild.generic_platform import *
+from mibuild.platforms import papilio_pro
+from misoclib.uart import UARTRX
+
+
+# antenna pin description to place at one of the free GPIOs on the board
+_transmitter_io = [
+	("antenna", 0, Pins("A:0"), IOStandard("LVTTL"))
+]
+
+
+# clock manager generating 300 MHz clock
+class ClockGen(Module):
+	def __init__(self, platform):
+		self.clock_domains.cd_sys = ClockDomain(reset_less=True)
+
+		clk300_unbuffered = Signal()
+		self.specials += Instance("DCM_CLKGEN",
+			p_CLKFXDV_DIVIDE=8, p_CLKFX_DIVIDE=8, p_CLKFX_MD_MAX=9.375, p_CLKFX_MULTIPLY=75,
+			p_CLKIN_PERIOD=31.25, p_SPREAD_SPECTRUM="NONE", p_STARTUP_WAIT="TRUE",
+		
+			i_CLKIN=platform.request("clk32"), o_CLKFX=clk300_unbuffered,
+			i_FREEZEDCM=0, i_RST=0)
+		self.specials += Instance("BUFG", i_I=clk300_unbuffered, o_O=self.cd_sys.clk)
+
+
+# Phase Accumulator module generating the target output frequencies
+# The magic happens here!
+class PhaseAccumulator(Module):
+	def __init__(self, ??):
+		self.out = Signal()
+
+		## your code here
+
+
+class FMTransmitter(Module):
+	def __init__(self, antenna, serial):
+		# Clock generator module
+		self.submodules.cg = ClockGen(platform)
+		clk_freq = 300000000  # 300 MHz
+
+		# UART receiver settings
+		baud = 115200	# UART transmission speed
+
+		# UART receiver
+		self.submodules.uart = UARTRX(
+			serial,
+			baud*2**32//clk_freq)
+		self.uart.source.payload.d.signed = True
+		sample = Signal((8, True)) # the (signed) sound sample for you to transmit
+		self.comb += sample.eq(self.uart.source.payload.d)
+
+		# FM transmitter settings
+		transmit_freq = ??	# carrier wave frequency in Hz
+		phaseacc_nbits = ??	# counter width
+		
+		## your code here
+		# some of the magic also happens here
+
+
+if __name__ == "__main__":
+	platform = papilio_pro.Platform()
+	platform.add_extension(_transmitter_io)
+	antenna = platform.request("antenna")
+	serial = platform.request("serial")
+	top = FMTransmitter(antenna, serial)
+	platform.build_cmdline(top)