## 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/>.
##
import sigrokdecode as srd
class Decoder(srd.Decoder):
- api_version = 2
+ api_version = 3
id = 'gpib'
name = 'GPIB'
longname = 'General Purpose Interface Bus'
- desc = 'IEEE-488 GPIB / HPIB protocol.'
+ desc = 'IEEE-488 General Purpose Interface Bus (GPIB / HPIB).'
license = 'gplv2+'
inputs = ['logic']
- outputs = ['gpib']
+ outputs = []
+ tags = ['PC']
channels = (
{'id': 'dio1' , 'name': 'DIO1', 'desc': 'Data I/O bit 1'},
{'id': 'dio2' , 'name': 'DIO2', 'desc': 'Data I/O bit 2'},
)
def __init__(self):
- self.olddav = None
+ self.reset()
+
+ def reset(self):
self.items = []
self.itemcount = 0
self.saved_item = None
self.saved_ATN = False
self.saved_EOI = False
self.samplenum = 0
- self.oldpins = None
self.ss_item = self.es_item = None
self.first = True
self.itemcount, self.items = 0, []
- def find_falling_dav_edge(self, dav, datapins):
- # Ignore sample if the DAV pin hasn't changed.
- if dav == self.olddav:
- return
- self.olddav = dav
- # Sample on falling DAV edge.
- if dav == 1:
- return
-
- # Found the correct DAV edge, now get the bits.
- self.handle_bits(datapins)
+ def decode(self):
- def decode(self, ss, es, data):
+ # Inspect samples at falling edge of DAV. But make sure to also
+ # start inspection when the capture happens to start with low
+ # DAV level. Optionally enforce processing when a user specified
+ # sample number was reached.
+ waitcond = [{9: 'l'}]
lsn = self.options['sample_total']
-
- for (self.samplenum, pins) in data:
- if lsn > 0:
- if (lsn - self.samplenum) == 1: # Show the last data word.
- self.handle_bits(pins)
-
- # Ignore identical samples early on (for performance reasons).
- if self.oldpins == pins:
- continue
- self.oldpins = pins
-
- self.find_falling_dav_edge(pins[9], pins)
+ if lsn:
+ waitcond.append({'skip': lsn})
+ while True:
+ if lsn:
+ waitcond[1]['skip'] = lsn - self.samplenum - 1
+ pins = self.wait(waitcond)
+ self.handle_bits(pins)
+ waitcond[0][9] = 'f'