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sinclairrf |
################################################################################
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#
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# Copyright 2012-2013, Sinclair R.F., Inc.
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#
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################################################################################
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from ssbccPeripheral import SSBCCperipheral
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class adder_16bit(SSBCCperipheral):
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"""The "adder_16bit" peripheral adds or subtracts two 16 bit values.\n
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Usage:
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PERIPHERAL adder_16bit\n
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The following OUTPORTs are provided by the peripheral:
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port description
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O_ADDER_16BIT_MSB1 MSB of first argument
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O_ADDER_16BIT_LSB1 LSB of first argument
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O_ADDER_16BIT_MSB2 MSB of second argument
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O_ADDER_16BIT_LSB2 LSB of second argument
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O_ADDER_16BIT_OP 0 ==> add, 1 ==> subtract\n
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The following INPORTs are provided by the peripheral:
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port description
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I_ADDER_16BIT_MSB MSB of the sum/difference
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I_ADDER_16BIT_LSB LSB of the sum/difference\n
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Example: Incorporate the peripheral:\n
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Example: Add an 8-bit value and a 16-bit value from the stack:\n
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Within the processor architecture file include the configuration command:\n
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PERIPHERAL adder_16bit\n
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Use the following assembly code to perform the addition to implement a
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function that adds an 8-bit value at the top of the data stack to the 16-bit
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value immediately below it:\n
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; ( u2_LSB u2_MSB u1 - (u1+u2)_LSB (u1+u2)_MSB
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.function add_u8_u16__u16
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; write the 8-bit value to the peripheral (after converting it to a 16 bit
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; value)
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; write the 16-bit value to the peripheral
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.outport(O_ADDER_16BIT_MSB2) .outport(O_ADDER_16BIT_LSB2)
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; command an addition
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; push the 16-bit sum onto the stack
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.inport(I_ADDER_16BIT_LSB) .inport(I_ADDER_16BIT_MSB)
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.return
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"""
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def __init__(self,peripheralFile,config,params,loc):
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# Use the externally provided file name for the peripheral
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self.peripheralFile = peripheralFile;
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# List the signals to be declared for the peripheral.
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config.AddSignal('s__adder_16bit_out_MSB',8,loc);
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config.AddSignal('s__adder_16bit_out_LSB',8,loc);
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config.AddSignal('s__adder_16bit_in_MSB1',8,loc);
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config.AddSignal('s__adder_16bit_in_LSB1',8,loc);
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config.AddSignal('s__adder_16bit_in_MSB2',8,loc);
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config.AddSignal('s__adder_16bit_in_LSB2',8,loc);
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config.AddSignal('s__adder_16bit_in_op',1,loc);
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# List the input ports to the peripheral.
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config.AddInport(('I_ADDER_16BIT_MSB',
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('s__adder_16bit_out_MSB',8,'data',),
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),loc);
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config.AddInport(('I_ADDER_16BIT_LSB',
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('s__adder_16bit_out_LSB',8,'data',),
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),loc);
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# List the output ports from the peripheral.
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config.AddOutport(('O_ADDER_16BIT_MSB1',False,
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('s__adder_16bit_in_MSB1',8,'data',),
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),loc);
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config.AddOutport(('O_ADDER_16BIT_LSB1',False,
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('s__adder_16bit_in_LSB1',8,'data',),
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),loc);
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config.AddOutport(('O_ADDER_16BIT_MSB2',False,
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('s__adder_16bit_in_MSB2',8,'data',),
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),loc);
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config.AddOutport(('O_ADDER_16BIT_LSB2',False,
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('s__adder_16bit_in_LSB2',8,'data',),
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),loc);
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config.AddOutport(('O_ADDER_16BIT_OP',False,
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('s__adder_16bit_in_op',1,'data',),
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),loc);
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def GenAssembly(self,config):
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fp = file('adder_16bit.s','w');
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fp.write("""; Copyright 2012-2013, Sinclair R.F., Inc.
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; adder_16bit.s
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; library to facilitate using the 16-bit adder peripheral
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; ( u_1_LSB u_1_MSB u_2_LSB u_2_MSB u_op - (u_1+u_2)_LSB (u_1+u_2)_MSB )
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.function addsub_u16_u16__u16
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.outport(O_ADDER_16BIT_OP)
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.outport(O_ADDER_16BIT_MSB2) .outport(O_ADDER_16BIT_LSB2)
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.outport(O_ADDER_16BIT_MSB1) .outport(O_ADDER_16BIT_LSB1)
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.inport(I_ADDER_16BIT_LSB) I_ADDER_16BIT_MSB
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.return(inport)
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""");
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def GenVerilog(self,fp,config):
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body = """//
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// PERIPHERAL adder_16bit:
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//
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always @ (posedge i_clk)
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if (s__adder_16bit_in_op == 1\'b0)
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{ s__adder_16bit_out_MSB, s__adder_16bit_out_LSB }
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<= { s__adder_16bit_in_MSB1, s__adder_16bit_in_LSB1 }
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+ { s__adder_16bit_in_MSB2, s__adder_16bit_in_LSB2 };
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else
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{ s__adder_16bit_out_MSB, s__adder_16bit_out_LSB }
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<= { s__adder_16bit_in_MSB1, s__adder_16bit_in_LSB1 }
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- { s__adder_16bit_in_MSB2, s__adder_16bit_in_LSB2 };
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""";
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body = self.GenVerilogFinal(config,body);
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fp.write(body);
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