import os, subprocess

from mibuild.generic_programmer import GenericProgrammer
from mibuild import tools

# XXX Lattice programmer need an .xcf file, will need clean up and support for more parameters
_xcf_template = """
<?xml version='1.0' encoding='utf-8' ?>
<!DOCTYPE		ispXCF	SYSTEM	"IspXCF.dtd" >
<ispXCF version="3.4.1">
	<Comment></Comment>
	<Chain>
		<Comm>JTAG</Comm>
		<Device>
			<SelectedProg value="TRUE"/>
			<Pos>1</Pos>
			<Vendor>Lattice</Vendor>
			<Family>LatticeECP3</Family>
			<Name>LFE3-35EA</Name>
			<File>{bitstream_file}</File>
			<Operation>Fast Program</Operation>
		</Device>
	</Chain>
	<ProjectOptions>
		<Program>SEQUENTIAL</Program>
		<Process>ENTIRED CHAIN</Process>
		<OperationOverride>No Override</OperationOverride>
		<StartTAP>TLR</StartTAP>
		<EndTAP>TLR</EndTAP>
		<VerifyUsercode value="FALSE"/>
	</ProjectOptions>
	<CableOptions>
		<CableName>USB2</CableName>
		<PortAdd>FTUSB-0</PortAdd>
		<USBID>Dual RS232-HS A Location 0000 Serial A</USBID>
		<JTAGPinSetting>
			TRST	ABSENT;
			ISPEN	ABSENT;
		</JTAGPinSetting>
	</CableOptions>
</ispXCF>
"""

class LatticeProgrammer(GenericProgrammer):
	needs_bitreverse = False

	def load_bitstream(self, bitstream_file):
		xcf_file = bitstream_file.replace(".bit", ".xcf")
		xcf_content = _xcf_template.format(bitstream_file=bitstream_file)
		tools.write_to_file(xcf_file, xcf_content)
		subprocess.call(["pgrcmd", "-infile", xcf_file])