aboutsummaryrefslogtreecommitdiffstats
path: root/System_Python/encoder.py
diff options
context:
space:
mode:
authorRaspberry Pi <raspberrypi@umn.edu>2019-11-20 01:22:22 -0600
committerRaspberry Pi <raspberrypi@umn.edu>2019-11-20 01:22:22 -0600
commitcaa2d9c446f5901671d30e52b1aaa4c56ef2f25c (patch)
treee541778f97d291c6bc4f160b4ec8cd9d24d538fb /System_Python/encoder.py
parentFixed encoder zeroing. Other minor changes, still trying to get the swingup c... (diff)
downloadee4511w-caa2d9c446f5901671d30e52b1aaa4c56ef2f25c.tar
ee4511w-caa2d9c446f5901671d30e52b1aaa4c56ef2f25c.tar.gz
ee4511w-caa2d9c446f5901671d30e52b1aaa4c56ef2f25c.tar.bz2
ee4511w-caa2d9c446f5901671d30e52b1aaa4c56ef2f25c.tar.lz
ee4511w-caa2d9c446f5901671d30e52b1aaa4c56ef2f25c.tar.xz
ee4511w-caa2d9c446f5901671d30e52b1aaa4c56ef2f25c.tar.zst
ee4511w-caa2d9c446f5901671d30e52b1aaa4c56ef2f25c.zip
Rework directory structure. Modify result file printing to match requirements of web server.
Diffstat (limited to 'System_Python/encoder.py')
-rw-r--r--System_Python/encoder.py77
1 files changed, 0 insertions, 77 deletions
diff --git a/System_Python/encoder.py b/System_Python/encoder.py
deleted file mode 100644
index ece7fd1..0000000
--- a/System_Python/encoder.py
+++ /dev/null
@@ -1,77 +0,0 @@
-# Import required modules
-import RPi.GPIO as GPIO
-import time
-import math
-
-# Constants: parameters that the caller cannot modify
-# Delay: Minimum delay necessary after pull pin low to read input
-delay = 0.0000005
-
-# Encoder Class
-# This controls the motor at the given IO
-class Encoder:
- def __init__(self, clk_pin, cs_pin, data_pin):
- # Set the board IO (just in case it hasn't been done yet)
- GPIO.setmode(GPIO.BCM)
- # Setup class varaiable
- self.offset = 0
- self.clk_pin = clk_pin
- self.cs_pin = cs_pin
- self.data_pin = data_pin
- # Setup the IO
- try:
- GPIO.setup(self.clk_pin, GPIO.OUT)
- GPIO.setup(self.cs_pin, GPIO.OUT)
- GPIO.setup(self.data_pin, GPIO.IN)
- # Setup the CS and CLK to be high
- GPIO.output(PIN_CLK, 1)
- GPIO.output(PIN_CS, 1)
- except:
- # If this fails, it's likely because the IO has already been configured. The encoders share some pins. Ignore the failure
- time.sleep(0.01) # Used just to have something in the exception catch
- #print("ERROR. Unable to setup the configuration required")
- # Wait some time to before reading
- time.sleep(0.5)
- def set_zero(self, offset = 0):
- # Take current position as zero
- pos = self.read_position('Raw')
- self.offset = (self.read_position('Raw') + self.offset + offset) % 1024
- def clockup(self):
- GPIO.output(self.clk_pin, 1)
- def clockdown(self):
- GPIO.output(self.clk_pin, 0)
- def read_position(self, format):
- # Most of this is based of timing diagram of encoder
- # Pull CS low to start reading
- GPIO.output(self.cs_pin, 0)
- # Delay necessary before reading is ready
- time.sleep(delay*2)
- data = 0
- # Clockdown necessary before reading
- self.clockdown()
- # Go through 10 bits needed to read
- for i in range(0, 10):
- # Clock up to start reading one bit
- self.clockup()
- # Shift data left and insert input
- data <<= 1
- data |= GPIO.input(self.data_pin)
- # Clock down after finish reading
- self.clockdown()
- # Pull CS high after finish reading
- GPIO.output(self.cs_pin, 1)
- # Format with offset, Max is 1024
- data = (data - self.offset) % 1024
- # Data is linearly mapped
- if format=="Raw":
- return data
- elif format == "Degrees":
- degrees = (data/1024.0) * 360.0
- return degrees
- elif format == "Radians":
- radians = (data/1024.0) * (2.0*math.pi)
- return radians
- else:
- print("ERROR. Invalid format (Raw, Degrees, Radians)")
- return None
-