license: remove FSF postal address from boiler plate license text

[libsigrokdecode.git] / decoders / onewire_network / __init__.py

diff --git a/decoders/onewire_network/__init__.py b/decoders/onewire_network/__init__.py
index 991919fcb658eb1d56221c1beb2a2c648a78c9f2..60907efa0ecb768fad7f5684130e58c364a787bf 100644 (file)
--- a/decoders/onewire_network/__init__.py
+++ b/decoders/onewire_network/__init__.py
@@ -1,5 +1,5 @@
 ##
-## This file is part of the sigrok project.
+## This file is part of the libsigrokdecode project.
 ##
 ## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
 ##
@@ -14,63 +14,43 @@
 ## GNU General Public License for more details.
 ##
 ## You should have received a copy of the GNU General Public License
-## along with this program; if not, write to the Free Software
-## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+## along with this program; if not, see <http://www.gnu.org/licenses/>.
 ##
 
 '''
-1-Wire protocol decoder.
+This decoder stacks on top of the 'onewire_link' PD and decodes the
+1-Wire protocol (network layer).
 
-The 1-Wire protocol enables bidirectional communication over a single wire (and
-ground) between a single master and one or multiple slaves. The protocol is
-layered, the provided parser decodes the next layers:
-- Link layer (reset, presence detection, reading/writing bits)
-- Network layer (skip, search, match device ROM addresses)
-The higher layers (transport, presentation) are not decoded, since they are
-mostly device specific and it would take a lot of code to interpret them.
+The 1-Wire protocol enables bidirectional communication over a single wire
+(and ground) between a single master and one or multiple slaves. The protocol
+is layered:
 
-Sample rate:
-A high enough sample rate is required to properly detect all the elements of
-the protocol. A lower sample rate can be used if the master does not use
-overdrive communication speed. The next minimal values should be used:
-- overdrive     available:   2MHz minimum, 5MHz suggested
-- overdrive not available: 400kHz minimum, 1MHz suggested
+ - Link layer (reset, presence detection, reading/writing bits)
+ - Network layer (skip/search/match device ROM addresses)
+ - Transport layer (transport data between 1-Wire master and device)
 
-Probes:
-1-Wire requires a single signal, but some master implementations might have a
-separate signal use to deliver power to the bus during temperature conversion
-as an example. This power signal is currently not parsed.
-- owr (1-Wire bus)
-- pwr (1-Wire power)
+Network layer:
 
-Options:
-1-Wire is an asynchronous protocol, so the decoder must know the sample rate.
-The timing for sampling bits, presence and reset is calculated by the decoder,
-but in case the user wishes to use different values, it is possible to
-configure the next timing values (number of sample rate periods):
-- overdrive              (if active the decoder will be prepared for overdrive)
-- cnt_normal_bit         (time for normal mode sample bit)
-- cnt_normal_presence    (time for normal mode sample presence)
-- cnt_normal_reset       (time for normal mode reset)
-- cnt_overdrive_bit      (time for overdrive mode sample bit)
-- cnt_overdrive_presence (time for overdrive mode sample presence)
-- cnt_overdrive_reset    (time for overdrive mode reset)
-This options should be configured only on very rare cases and the user should
-read the decoder source code to understand them correctly.
+The following link layer annotations are shown:
 
-Annotations:
-Annotations can be shown for each layer of the protocol separately:
-- link (the value of each transmitted bit is shown separately)
-- network (the ROM command, and address are shown)
-- transport (only transport layer byte transfers are shown)
-If link layer annotations are shown, possible issues with sample rate and sample
-timing are also shown.
+ - RESET/PRESENCE True/False
+   The event is marked from the signal negative edge to the end of the reset
+   high period. It is also reported if there are any devices attached to the
+   bus.
+
+The following network layer annotations are shown:
+
+ - ROM command <val> <name>
+   The requested ROM command is displayed as an 8bit hex value and by name.
+ - ROM <val>
+   The 64bit value of the addressed device is displayed:
+   Family code (1 byte) + serial number (6 bytes) + CRC (1 byte)
+ - Data <val>
+   Data intended for the transport layer is displayed as an 8bit hex value.
 
 TODO:
-- add CRC checks for network layer
-- add transport layer code
-- review link layer code, to check for protocol correctness
-- define output protocol
+ - Add CRC checks, to see if there were communication errors on the wire.
+ - Add reporting original/complement address values from the search algorithm.
 '''
 
-from .onewire_network import *
+from .pd import Decoder