Hi, thanks for suggestion, I have tried 's <- readProcess "cat" [w1paht] []'. Probably not a cleanest solution but it works. Libor On Saturday, May 11, 2013 at 13:50, mukesh tiwari wrote:

Hi Libor, Probably it has something to do reading binary file though not sure. Try reading the binary file[1].

[1] http://www.haskell.org/haskellwiki/DealingWithBinaryData

On Sat, May 11, 2013 at 2:40 PM, Libor Wagner wrote:

...

Hi,

I have small code snippet to read content of a file, which should grow into simple tool to read temperature from sensor on Raspberry Pi:

module Main where

import System.Environment

main :: IO () main = do [f] <- getArgs s <- readFile f putStr s

When this is called with the test file I have copied from the real location it works fine:

$ cat /sys/bus/w1/devices/28-000004e46240/w1_slave >test.txt $ ./ds18b20 test.txt 53 01 4b 46 7f ff 0d 10 e9 : crc=e9 YES 53 01 4b 46 7f ff 0d 10 e9 t=21187

How ever when called with the real location nothing happens:

$ ./ds18b20 /sys/bus/w1/devices/28-000004e46240/w1_slave

Can someone help? I have thought that the file is not properly ended so I have tried to take just first line but that doest work either.

Thanks Libor

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