Add contrib script for 93c46 EEPROM

contrib/pyHydra_93c46/README.md

@@ -0,0 +1,13 @@
+Script to communicate with Hydrabus to 93c46 3-wire EEPROM.
+
+The script uses the pyHydrabus library.
+This script requires Python 3.2+
+
+Dependencies:
+pip3 install serial
+
+Author: Sylvain Pelissier <[email protected]>
+
+License: GPLv3 (https://choosealicense.com/licenses/gpl-3.0/)
+
+(if license conflicts with hydrafw license, hydrafw license prevails)

contrib/pyHydra_93c46/hydra_93c46.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+#
+# Script to communicate to 94c46 3-wire EEPROM with Hydrabus.
+#
+# Author: Sylvain Pelissier <[email protected]>
+# License: GPLv3 (https://choosealicense.com/licenses/gpl-3.0/)
+#
+import pyHydrabus
+
+from binascii import hexlify
+
+def write_enable():
+ # Write enable is 10011XXXX
+ cs.value=1
+ sm.sda = 1
+ sm.clock()
+ sm.sda = 0
+ sm.clocks(2)
+ sm.sda = 1
+ sm.clocks(8)
+ cs.value=0
+
+def write_disable():
+ # Write disable is 10000XXXXX
+ cs.value=1
+ sm.sda = 1
+ sm.clock()
+ sm.sda = 0
+ sm.clocks(10)
+ cs.value=0
+
+def read(address, num):
+ address = address & 0x3f
+ cs.value=1
+ sm.write(bytes([0x01, 0x80 | address]))
+ data = sm.read(num)
+ cs.value=0
+
+ return data
+
+def write(address, data):
+
+ if len(data) % 2 == 1:
+ print("Data length must be even")
+ exit(2)
+
+ for i in range(0, len(data) , 2):
+ cs.value=1
+ sm.write(bytes([0x01, 0x40 | address+i//2]) + data[i:i+2])
+ cs.value=0
+
+if __name__ == '__main__':
+ sm=pyHydrabus.RawWire('/dev/ttyACM0')
+ sm.gpio_mode = 1
+ sm.set_speed(50000)
+ sm.wires = 3
+
+ # CS pin configuration with auxiliary pin PC4
+ cs = sm.AUX[0]
+ cs.direction=0
+ cs.value=0
+
+ # Read memory cotent
+ print(hexlify(read(0, 128)))
+
+ # Write 4 bytes of data
+ write_enable()
+ data = b"\xa5\xa6\x45\x46"
+ write(0,data)
+ write_disable()
+
+ # Read memory cotent
+ print(hexlify(read(0, 128)))

contrib/pyHydrabus/pyHydrabus/auxpin.py

@@ -12,7 +12,7 @@ class AUXPin():
  :example:
 
  >>> import pyHydrabus
- >>> i=pyHydrabus.I2C('/dev/hydrabus')
+ >>> i=pyHydrabus.RawWire('/dev/hydrabus')
  >>> # Set AUX pin 0 (PC4) to output
  >>> i.AUX[0].direction = 0
  >>> # Set AUX pin to logical 1

contrib/pyHydrabus/pyHydrabus/rawwire.py

@@ -23,7 +23,14 @@ class RawWire(Protocol):
 
  :example:
 
- TODO
+ >>> import pyHydrabus
+ >>> i=pyHydrabus.I2C('/dev/hydrabus')
+ >>> # Set SDA to high
+ >>> sm.sda = 1
+ >>> # Send two clock ticks
+ >>> sm.clocks(2)
+ >>> # Read two bytes
+ >>> data = sm.read(2)
 
  """
 
@@ -254,7 +261,7 @@ def wires(self, value):
  @property
  def gpio_mode(self):
  """
- Raw-Wire GPIO mode (1=Push-Pull, 2=Open Drain)
+ Raw-Wire GPIO mode (0=Push-Pull, 1=Open Drain)
  """
  return (self._config & 0b1000) >> 3
 
@@ -269,5 +276,5 @@ def gpio_mode(self, value):
  self._configure_port()
  return True
  else:
- self._logger.error("Incorrect value. Must be 1 or 2")
+ self._logger.error("Incorrect value. Must be 0 or 1")