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################################################################################
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# Copyright 2012-2015, Sinclair R.F., Inc.
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#
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# Base classes and utility function for generating general-purpose and interrupt
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# Copyright 2012-2014, Sinclair R.F., Inc.
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# peripherals.
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#
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################################################################################
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import re
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import re
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from ssbccUtil import IntValue
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from ssbccUtil import IsIntExpr
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from ssbccUtil import IsIntExpr
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from ssbccUtil import IsPosInt
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from ssbccUtil import IsPosInt
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from ssbccUtil import IsPowerOf2
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from ssbccUtil import IsPowerOf2
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from ssbccUtil import ParseIntExpr
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from ssbccUtil import ParseIntExpr
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from ssbccUtil import SSBCCException
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from ssbccUtil import SSBCCException
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raise SSBCCException('Cannot be less than %d' % lowLimit);
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raise SSBCCException('Cannot be less than %d' % lowLimit);
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if (highLimit != None) and value > highLimit:
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if (highLimit != None) and value > highLimit:
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raise SSBCCException('Cannot be more than %d' % highLimit);
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raise SSBCCException('Cannot be more than %d' % highLimit);
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return value;
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return value;
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def IntValueMethod(self,value):
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"""
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"""
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return IntValue(value);
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def RateMethod(self,config,value):
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def RateMethod(self,config,value):
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"""
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"""
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Return the string to evaluate the provided value or ratio of two values.
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Return the string to evaluate the provided value or ratio of two values.
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The value can be an integer (including underscores), a constant, or a
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The value can be an integer (including underscores), a constant, or a
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parameter. Ratios are restated to do rounding instead of truncation.\n
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parameter. Ratios are restated to do rounding instead of truncation.\n
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raise SSBCCException('%s must be %s or greater' % (v,lowLimit,));
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raise SSBCCException('%s must be %s or greater' % (v,lowLimit,));
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if (highLimit != None) and (v > highLimit):
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if (highLimit != None) and (v > highLimit):
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raise SSBCCException('%s must be %s or smaller' % (v,highLimit,));
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raise SSBCCException('%s must be %s or smaller' % (v,highLimit,));
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return v;
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return v;
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################################################################################
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#
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# Base class for interrupt peripherals.
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#
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################################################################################
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class SSBCCinterruptPeripheral(SSBCCperipheral):
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"""
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Base class for interrupt peripherals.
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"""
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instance = None;
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def __init__(self,config,loc):
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"""
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Perform tasks common to all interrupt peripherals:
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Ensure only one interrupt peripheral is defined.
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Declare the O_INTERRUPT_DIS and O_INTERRUPT_ENA output ports.
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These are set/reset outports and only require 2 instructions.
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These 2-instruction sequences are automatically generated by the ".ena"
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and ".dis" macros.
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...\n
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Note: The "param_list" normally part of a peripheral __init__ method is
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missing. First, it isn't required here. Second, that helps ensure
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that this class is not instantiated by itself as a peripheral.
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"""
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# Ensure only one interrupt peripheral gets defined.
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if SSBCCinterruptPeripheral.instance:
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raise SSBCCException('Interrupt peripheral already defined before line %d' % loc);
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SSBCCinterruptPeripheral.instance = self;
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# Add the signals required by the interrupt handler.
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config.AddSignal('s_interrupt',1,loc);
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config.AddSignal('s_interrupted',1,loc);
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# Add the outports to disable and enable interrupts.
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self.ix_outport_interrupt_dis = config.NOutports();
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config.AddOutport(('O_INTERRUPT_DIS',True,),loc);
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self.ix_outport_interrupt_ena = config.NOutports();
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config.AddOutport(('O_INTERRUPT_ENA',True,),loc);
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################################################################################
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#
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# Utilties for interrupt peripherals.
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#
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################################################################################
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def InterruptPeripheralAssigned():
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"""
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Indicate whether or not an interrupt peripheral has been generated.
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"""
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return True if SSBCCinterruptPeripheral.instance else False;
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