[myhdl-list] Array of constants and code generation

[Thomas H. <th...@ct...>]

I'm trying to implement a cordic module to calculate the phase of a
vector with rectangular coordinates x and y.  The cordic is a full
parallel pipelined architecture; the vector rotations are generated in a 
loop.  The angles are precalculated as integers in a list.
The code simulates perfectly; but code generation with toVHDL
or toVerilog fails with this error:

ConversionError: in file 
C:\Users\thomas\devel\mytss5\dist\components\_Pythonlib\pmc4\hardware\ip\cordic.py, 
line 40:
     Object type is not supported in this context: angles, <type 'list'>

I tried a tuple instead of a list but conversion failed as well.

How can I rewrite the code for conversion?

Thanks,
Thomas

<code>
SCALE = 2000
N = 10

def Cordic(clk,
            x, y,
            phase):

     xi = [hdl_util.signed(13) for _ in range(N)]
     yi = [hdl_util.signed(13) for _ in range(N)]
     zi = [hdl_util.signed(12) for _ in range(N)]

     angles = [int(round(math.atan(2**-i) * SCALE / 2 / math.pi))
               for i in range(N)]

     @myhdl.always(clk.posedge)
     def doit():
         if x < 0:
             xi[0].next = -x
             yi[0].next = -y
             zi[0].next = SCALE // 4 * 3
         else:
             xi[0].next = x
             yi[0].next = y
             zi[0].next = SCALE // 4

         for i in range(9):
             if yi[i] < 0:
                 xi[i+1].next = xi[i] - (yi[i] >> i)
                 yi[i+1].next = yi[i] + (xi[i] >> i)
                 zi[i+1].next = zi[i] + angles[i]
             else:
                 xi[i+1].next = xi[i] + (yi[i] >> i)
                 yi[i+1].next = yi[i] - (xi[i] >> i)
                 zi[i+1].next = zi[i] - angles[i]

         print(xi[-1], yi[-1], zi[-1])

         phase.next = zi[-1]

     return myhdl.instances()

</code>