iomacros.nim

import macros

macro sfrb*(nam: expr, loc: int16): stmt {.immediate.} =
  result = newNimNode(nnkStmtList)
  nam.expectKind(nnkIdent)
  let name = $nam.ident
  result.add(parseStmt("var "&name&"* {.volatile, extern:\"__"&name&"\".}: uint8"))

macro sfrw*(nam: expr, loc: int16): stmt {.immediate.} =
  result = newNimNode(nnkStmtList)
  nam.expectKind(nnkIdent)
  let name = $nam.ident
  # Turns out the support library already has the symbols, use extern like C
  result.add(parseStmt("var "&name&"* {.volatile, extern:\"__"&name&"\".}: uint16"))

# Note: may have to be redefined on 20-bit msp430s
macro sfra*(nam: expr, loc: int16): stmt {.immediate.} =
  result = newNimNode(nnkStmtList)
  nam.expectKind(nnkIdent)
  let name = $nam.ident
  # TODO: use address type
  result.add(parseStmt("var "&name&"* {.volatile, extern:\"__"&name&"\".}: uint16"))

## TODO: patch in volatile in appropriate places
## TODO: make const registers const
template const_sfrb*(nam,loc) = sfrb(nam,loc)
template const_sfrw*(nam,loc) = sfrw(nam,loc)
template const_sfra*(nam,loc) = sfra(nam,loc)