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io.go
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io.go
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package io
const UNUSED_REGISTER = "UNUSED_REGISTER"
const READ = "read"
const WRITE = "write"
type registerHook func(reg string, typ string, data uint8)
// Register represents an read/write io register
type Register struct {
Read func() uint8
Write func(uint8)
Name string
}
type RegisterFactory struct {
hook registerHook
}
func NewRegisterFactory() *RegisterFactory {
return NewRegisterFactoryWithHook(nil)
}
func NewRegisterFactoryWithHook(hook registerHook) *RegisterFactory {
return &RegisterFactory{
hook: hook,
}
}
func (rf *RegisterFactory) NewRegister(read func() uint8, write func(uint8), name ...string) *Register {
regname := UNUSED_REGISTER
if read == nil {
read = unusedRead
}
if write == nil {
write = unusedWrite
}
if len(name) > 0 {
regname = name[0]
}
rread := read
rwrite := write
if rf.hook != nil {
rread = func() uint8 {
res := read()
rf.hook(regname, READ, res)
return res
}
rwrite = func(data uint8) {
write(data)
rf.hook(regname, WRITE, data)
}
}
r := &Register{
rread,
rwrite,
regname,
}
return r
}
func unusedRead() uint8 {
return 0
}
func unusedWrite(_ uint8) {
}