more progress on UART read

This commit is contained in:
Yehowshua Immanuel 2025-02-25 23:47:00 -05:00
parent 7265728932
commit 8d5cd862ab
9 changed files with 77 additions and 31 deletions

View file

@ -30,6 +30,8 @@ alignCheck addr SizeQuadWord = addr `mod` 16 == 0
(ramStart, ramEnd) = (0x80000000 :: Addr, ramStart + (bytesInRam - 1))
(uartStart, uartEnd) = (0x10000000 :: Addr, uartStart + 7)
-- reading/writing from/to UART is implemented as reading/writing
-- from/to STDIO, so we need IO.
read :: Request -> Peripherals -> IO ReadResponse
read (Request addr size) peripherals
| not (alignCheck addr size) = return $ ReadResponse $ Error UnAligned
@ -40,15 +42,3 @@ read (Request addr size) peripherals
ramAddrNoOffset = addr - ramStart
ramAddr :: RamAddr
ramAddr = resize ramAddrNoOffset
-- | (addr > ramStart) && (addr < ramEnd) = return $ ReadResponse $ Peripherals.Ram.read addr size (ram peripherals)
-- | addr >= numBytesInRam = ReadError UnMapped
-- case size of
-- SizeByte -> BusByte $ fromIntegral $ extractByte (ramRead 0)
-- SizeHalfWord -> BusHalfWord $ fromIntegral $ (ramRead 0 `shiftL` 8) .|. ramRead 1
-- SizeWord -> BusWord $ fromIntegral $ concatReads [0..3]
-- SizeDoubleWord -> BusDoubleWord $ fromIntegral $ concatReads [0..7]
-- SizeQuadWord -> BusQuadWord $ fromIntegral $ concatReads [0..15]
-- where
-- ramRead offset = Peripherals.Ram.read (ram peripherals) (fromIntegral (addr + offset))
-- concatReads offsets = foldl (\acc o -> (acc `shiftL` 8) .|. ramRead o) 0 offsets