-- there are 8 registers to track for lmx2487
-- labeled R0, R1, ..., R7 in the manual
lmx2487_registers   = {0, 0, 0, 0, 0, 0, 0, 0}
-- if need update set to true updater script will resend this register
lmx2487_need_update = {false, false, false, false, false, false, false, false} 

function set_lmx2487register(value, register)
	-- register labeled 0, 1, 2, ..., 7
	if (lmx2487_registers[register+1] ~= value) then
		-- this is new value and thus needs to be updated in hardware
		lmx2487_registers[register+1] = value
		lmx2487_need_update[register+1] = true
		print("updating register " .. register .. " with value " .. value)
	end
	-- otherwise we do nothing
end

function send_register_lmx2487( register) 
	if ( lmx2487_need_update[register] ) then
		print("sending register " .. register .. " with value " .. lmx2487_registers[register])
		-- do hardware talking
		lmx2487_need_update[register]=false
	end
end

function update_lmx2487state() 
	for register=7,0,-1 do
		-- going over registers
		-- manual suggest to send R0 as last one
		send_register_lmx2487( register )
	end
end


function set_lmx2487_board_to_default_state()
	-- this defaults are historic and borrowed from lmx2487lib.tcl
	-- defaults (set RF freq to 6.83468635e9 GHz and lock it to 10MHz oscillator)
	set_lmx2487register(11197502  , 0)
	set_lmx2487register(4352515   , 1)
	set_lmx2487register(8560613   , 2)
	set_lmx2487register(15925287  , 3)
	set_lmx2487register(10618633  , 4)
	set_lmx2487register(393579    , 5)
	set_lmx2487register(8126541   , 6)
	set_lmx2487register(10639     , 7)

	update_lmx2487state()
end