## 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 SamplerateError(Exception):
- pass
-
class Decoder(srd.Decoder):
api_version = 3
id = 'stepper_motor'
desc = 'Absolute position and movement speed from step/dir.'
license = 'gplv2+'
inputs = ['logic']
- outputs = ['stepper_motor']
+ outputs = []
+ tags = ['Embedded/industrial']
channels = (
{'id': 'step', 'name': 'Step', 'desc': 'Step pulse'},
{'id': 'dir', 'name': 'Direction', 'desc': 'Direction select'},
('position', 'Position')
)
annotation_rows = (
- ('speed', 'Speed', (0,)),
- ('position', 'Position', (1,)),
+ ('speeds', 'Speeds', (0,)),
+ ('positions', 'Positions', (1,)),
)
def __init__(self):
+ self.reset()
+
+ def reset(self):
+ self.samplerate = None
self.oldstep = None
self.ss_prev_step = None
self.pos = 0
def step(self, ss, direction):
if self.ss_prev_step is not None:
- delta = ss - self.ss_prev_step
- speed = self.samplerate / delta / self.scale
- speed_txt = self.format % speed
+ if self.samplerate:
+ delta = ss - self.ss_prev_step
+ speed = self.samplerate / delta / self.scale
+ speed_txt = self.format % speed
+ self.put(self.ss_prev_step, ss, self.out_ann,
+ [0, [speed_txt + ' ' + self.unit + '/s', speed_txt]])
pos_txt = self.format % (self.pos / self.scale)
- self.put(self.ss_prev_step, ss, self.out_ann,
- [0, [speed_txt + ' ' + self.unit + '/s', speed_txt]])
self.put(self.ss_prev_step, ss, self.out_ann,
[1, [pos_txt + ' ' + self.unit, pos_txt]])
self.samplerate = value
def decode(self):
- if not self.samplerate:
- raise SamplerateError('Cannot decode without samplerate.')
while True:
step, direction = self.wait({0: 'r'})
self.step(self.samplenum, direction)