def __init__(self, if_id, index, direction):
"""Return a new instance of a Pmod IO object.
Parameters
----------
if_id : int
The interface ID (1, 2) corresponding to (PMODA, PMODB).
index: int
The index of the Pmod pin, from 0 to 7.
direction : str
Input 'in' or output 'out'.
"""
if not if_id in [PMODA, PMODB]:
raise ValueError("No such IOP for Pmod device.")
if not index in range(8):
raise ValueError("Valid pin indexes are 0 - 7.")
if not direction in ['in', 'out']:
raise ValueError("Direction can only be 'in', or 'out'.")
self.iop = DevMode(if_id, iop_const.PMOD_SWCFG_DIOALL)
self.index = index
self.direction = direction
self.iop.start()
if self.direction == 'in':
self.iop.write_cmd(
iop_const.PMOD_DIO_BASEADDR + iop_const.PMOD_DIO_TRI_OFFSET,
iop_const.PMOD_CFG_DIO_ALLINPUT)
else:
self.iop.write_cmd(
iop_const.PMOD_DIO_BASEADDR + iop_const.PMOD_DIO_TRI_OFFSET,
iop_const.PMOD_CFG_DIO_ALLOUTPUT)
self.iop.load_switch_config()
def __init__(self, if_id, index):
"""Return a new instance of a LED object.
Parameters
----------
if_id : int
The interface ID (1, 2) corresponding to (PMODA, PMODB).
index: int
The index of the pin in a Pmod, from 0 to 7.
"""
if not if_id in [PMODA, PMODB]:
raise ValueError("No such IOP for Pmod device.")
if not index in range(8):
raise ValueError("Valid pin indexes are 0 - 7.")
self.iop = DevMode(if_id, iop_const.PMOD_SWCFG_DIOALL)
self.index = index
self.iop.start()
self.iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_TRI_OFFSET, \
iop_const.PMOD_CFG_DIO_ALLOUTPUT)
self.iop.load_switch_config()
def __init__(self, if_id, index, direction):
"""Return a new instance of a Arduino IO object.
Parameters
----------
if_id : int
The interface ID (3) corresponding to (ARDUINO).
index: int
The index of the Arduino pin, from 0 to 19.
direction : str
Input 'in' or output 'out'.
"""
if not if_id in [ARDUINO]:
raise ValueError("No such IOP for Arduino device.")
if (index not in range(20)):
raise ValueError("Valid pin indexes are 0 - 19.")
if (direction not in ['in', 'out']):
raise ValueError("Direction can only be 'in', or 'out'.")
self.iop = DevMode(if_id, iop_const.ARDUINO_SWCFG_DIOALL)
self.index = index
self.direction = direction
self.iop.start()
if self.index in range(2):
if (self.direction == 'in'):
self.iop.write_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_TRI_OFFSET, \
iop_const.ARDUINO_CFG_UART_ALLINPUT)
else:
self.iop.write_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_TRI_OFFSET, \
iop_const.ARDUINO_CFG_UART_ALLOUTPUT)
elif self.index in range(2, 14):
if (self.direction == 'in'):
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_DIO_ALLINPUT)
else:
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_DIO_ALLOUTPUT)
else:
if (self.direction == 'in'):
self.iop.write_cmd(iop_const.ARDUINO_AIO_BASEADDR + \
iop_const.ARDUINO_AIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_AIO_ALLINPUT)
else:
self.iop.write_cmd(iop_const.ARDUINO_AIO_BASEADDR + \
iop_const.ARDUINO_AIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_AIO_ALLOUTPUT)
self.iop.load_switch_config()
def __init__(self, if_id, scl_pin, sda_pin, iic_addr):
"""Return a new instance of a Pmod IIC object.
Parameters
----------
if_id : int
The interface ID (1, 2) corresponding to (PMODA, PMODB).
scl_pin : int
The SCL pin number.
sda_pin : int
The SDA pin number.
iic_addr : int
The IIC device address.
"""
if not if_id in [PMODA, PMODB]:
raise ValueError("No such IOP for Pmod device.")
if scl_pin not in range(8):
raise ValueError("Valid SCL pin numbers are 0 - 7.")
if sda_pin not in range(8):
raise ValueError("Valid SDA pin numbers are 0 - 7.")
switchconfig = []
for i in range(8):
if i == sda_pin:
switchconfig.append(iop_const.PMOD_SWCFG_IIC0_SDA)
elif i == scl_pin:
switchconfig.append(iop_const.PMOD_SWCFG_IIC0_SCL)
else:
switchconfig.append(iop_const.PMOD_SWCFG_DIO0)
self.iop = DevMode(if_id, switchconfig)
self.iop.start()
self.iop.load_switch_config(switchconfig)
self.iic_addr = iic_addr
# Useful IIC controller addresses
self.sr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_SR_REG_OFFSET
self.dtr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_DTR_REG_OFFSET
self.cr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_CR_REG_OFFSET
self.rfd_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_RFD_REG_OFFSET
self.drr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_DRR_REG_OFFSET
def test_devmode():
"""Tests whether DevMode returns an _IOP for Pmod 1 and 2.
For each Pmod ID, instantiate a DevMode object with various switch
configurations. The returned objects should not be None.
"""
for iop_id in range(1,3):
assert DevMode(iop_id, iop_const.PMOD_SWCFG_IIC0_TOPROW) is not None
assert DevMode(iop_id, iop_const.PMOD_SWCFG_IIC0_BOTROW) is not None
assert DevMode(iop_id, iop_const.PMOD_SWCFG_DIOALL) is not None
ol.reset()
def __init__(self, if_id, index):
"""Return a new instance of a LED object.
Parameters
----------
if_id : int
The interface ID (1, 2) corresponding to (PMODA, PMODB).
index: int
The index of the pin in a Pmod, from 0 to 7.
"""
if not if_id in [PMODA, PMODB]:
raise ValueError("No such IOP for Pmod device.")
if not index in range(8):
raise ValueError("Valid pin indexes are 0 - 7.")
self.iop = DevMode(if_id, iop_const.PMOD_SWCFG_DIOALL)
self.index = index
self.iop.start()
self.iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_TRI_OFFSET, \
iop_const.PMOD_CFG_DIO_ALLOUTPUT)
self.iop.load_switch_config()
def test_devmode():
"""Tests whether DevMode write and read work for Pmod 1 and 2.
For each Pmod ID, write a command to the mailbox and read another command
from the mailbox. Test whether the write and the read are successful.
"""
for iop_id in range(1,3):
# Initiate the IOP
iop = DevMode(iop_id, iop_const.PMOD_SWCFG_DIOALL)
iop.start()
assert iop.status()=="RUNNING"
# Test whether writing is successful
data = 0
iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_TRI_OFFSET,
iop_const.PMOD_CFG_DIO_ALLINPUT)
iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET, data)
# Test whether reading is successful
iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_TRI_OFFSET,
iop_const.PMOD_CFG_DIO_ALLOUTPUT)
data = iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
# Stop the IOP
iop.stop()
assert iop.status()=="STOPPED"
ol.reset()
def __init__(self, if_id, index, direction):
"""Return a new instance of a Pmod IO object.
Parameters
----------
if_id : int
The interface ID (1, 2) corresponding to (PMODA, PMODB).
index: int
The index of the Pmod pin, from 0 to 7.
direction : str
Input 'in' or output 'out'.
"""
if not if_id in [PMODA, PMODB]:
raise ValueError("No such IOP for Pmod device.")
if not index in range(8):
raise ValueError("Valid pin indexes are 0 - 7.")
if not direction in ['in', 'out']:
raise ValueError("Direction can only be 'in', or 'out'.")
self.iop = DevMode(if_id, iop_const.PMOD_SWCFG_DIOALL)
self.index = index
self.direction = direction
self.iop.start()
if (self.direction == 'in'):
self.iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_TRI_OFFSET, \
iop_const.PMOD_CFG_DIO_ALLINPUT)
else:
self.iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_TRI_OFFSET, \
iop_const.PMOD_CFG_DIO_ALLOUTPUT)
self.iop.load_switch_config()
def __init__(self, if_id, index, direction):
"""Return a new instance of a Arduino IO object.
Parameters
----------
if_id : int
The interface ID (3) corresponding to (ARDUINO).
index: int
The index of the Arduino pin, from 0 to 19.
direction : str
Input 'in' or output 'out'.
"""
if not if_id in [ARDUINO]:
raise ValueError("No such IOP for Arduino device.")
if (index not in range(20)):
raise ValueError("Valid pin indexes are 0 - 19.")
if (direction not in ['in', 'out']):
raise ValueError("Direction can only be 'in', or 'out'.")
self.iop = DevMode(if_id, iop_const.ARDUINO_SWCFG_DIOALL)
self.index = index
self.direction = direction
self.iop.start()
if self.index in range(2):
if (self.direction == 'in'):
self.iop.write_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_TRI_OFFSET, \
iop_const.ARDUINO_CFG_UART_ALLINPUT)
else:
self.iop.write_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_TRI_OFFSET, \
iop_const.ARDUINO_CFG_UART_ALLOUTPUT)
elif self.index in range(2,14):
if (self.direction == 'in'):
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_DIO_ALLINPUT)
else:
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_DIO_ALLOUTPUT)
else:
if (self.direction == 'in'):
self.iop.write_cmd(iop_const.ARDUINO_AIO_BASEADDR + \
iop_const.ARDUINO_AIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_AIO_ALLINPUT)
else:
self.iop.write_cmd(iop_const.ARDUINO_AIO_BASEADDR + \
iop_const.ARDUINO_AIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_AIO_ALLOUTPUT)
self.iop.load_switch_config()
def __init__(self, if_id, scl_pin, sda_pin, iic_addr):
"""Return a new instance of a Pmod IIC object.
Parameters
----------
if_id : int
The interface ID (1, 2) corresponding to (PMODA, PMODB).
scl_pin : int
The SCL pin number.
sda_pin : int
The SDA pin number.
iic_addr : int
The IIC device address.
"""
if not if_id in [PMODA, PMODB]:
raise ValueError("No such IOP for Pmod device.")
if (scl_pin not in range(8)):
raise ValueError("Valid SCL pin numbers are 0 - 7.")
if (sda_pin not in range(8)):
raise ValueError("Valid SDA pin numbers are 0 - 7.")
switchconfig = []
for i in range(8):
if i == sda_pin:
switchconfig.append(iop_const.PMOD_SWCFG_IIC0_SDA)
elif i == scl_pin:
switchconfig.append(iop_const.PMOD_SWCFG_IIC0_SCL)
else:
switchconfig.append(iop_const.PMOD_SWCFG_DIO0)
self.iop = DevMode(if_id, switchconfig)
self.iop.start()
self.iop.load_switch_config(switchconfig)
self.iic_addr = iic_addr
# Useful IIC controller addresses
self.sr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_SR_REG_OFFSET
self.dtr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_DTR_REG_OFFSET
self.cr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_CR_REG_OFFSET
self.rfd_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_RFD_REG_OFFSET
self.drr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_DRR_REG_OFFSET
class Pmod_IO(object):
"""This class controls the Pmod IO pins as inputs or outputs.
Note
----
The parameter 'direction' determines whether the instance is input/output:
'in' : receiving input from offchip to onchip.
'out' : sending output from onchip to offchip.
The index of the Pmod pins:
upper row, from left to right: {vdd,gnd,3,2,1,0}.
lower row, from left to right: {vdd,gnd,7,6,5,4}.
Attributes
----------
iop : _IOP
The _IOP object returned from the DevMode.
index : int
The index of the Pmod pin, from 0 to 7.
direction : str
Input 'in' or output 'out'.
"""
def __init__(self, if_id, index, direction):
"""Return a new instance of a Pmod IO object.
Parameters
----------
if_id : int
The interface ID (1, 2) corresponding to (PMODA, PMODB).
index: int
The index of the Pmod pin, from 0 to 7.
direction : str
Input 'in' or output 'out'.
"""
if not if_id in [PMODA, PMODB]:
raise ValueError("No such IOP for Pmod device.")
if not index in range(8):
raise ValueError("Valid pin indexes are 0 - 7.")
if not direction in ['in', 'out']:
raise ValueError("Direction can only be 'in', or 'out'.")
self.iop = DevMode(if_id, iop_const.PMOD_SWCFG_DIOALL)
self.index = index
self.direction = direction
self.iop.start()
if (self.direction == 'in'):
self.iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_TRI_OFFSET, \
iop_const.PMOD_CFG_DIO_ALLINPUT)
else:
self.iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_TRI_OFFSET, \
iop_const.PMOD_CFG_DIO_ALLOUTPUT)
self.iop.load_switch_config()
def write(self, value):
"""Send the value to the offboard Pmod IO device.
Note
----
Only use this function when direction is 'out'.
Parameters
----------
value : int
The value to be written to the Pmod IO device.
Returns
-------
None
"""
if not value in (0,1):
raise ValueError("Pmod IO can only write 0 or 1.")
if not self.direction == 'out':
raise ValueError('Pmod IO used as output, declared as input.')
if value:
curVal = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
newVal = curVal | (0x1<<self.index)
self.iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET, newVal)
else:
curVal = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
newVal = curVal & (0xff ^ (0x1<<self.index))
self.iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET, newVal)
def read(self):
"""Receive the value from the offboard Pmod IO device.
Note
----
Only use this function when direction is 'in'.
Parameters
----------
None
Returns
-------
int
The data (0 or 1) on the specified Pmod IO pin.
"""
if not self.direction == 'in':
raise ValueError('Pmod IO used as input, but declared as output.')
raw_value = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
return (raw_value >> (self.index)) & 0x1
def _state(self):
"""Retrieve the current state of the Pmod IO.
This function is usually used for debug purpose. Users should still
rely on read() or write() to get/put a value.
Parameters
----------
None
Returns
-------
int
The data (0 or 1) on the specified Pmod IO pin.
"""
raw_value = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
return (raw_value >> (self.index)) & 0x1
class Arduino_IO(object):
"""This class controls the Arduino IO pins as inputs or outputs.
Note
----
The parameter 'direction' determines whether the instance is input/output:
'in' : receiving input from offchip to onchip.
'out' : sending output from onchip to offchip.
Note
----
The index of the Arduino pins:
upper row, from right to left: {0, 1, ..., 13}. (D0 - D13)
lower row, from left to right: {14, 15,..., 19}. (A0 - A5)
Attributes
----------
iop : _IOP
The _IOP object returned from the DevMode.
index : int
The index of the Arduino pin, from 0 to 19.
direction : str
Input 'in' or output 'out'.
"""
def __init__(self, if_id, index, direction):
"""Return a new instance of a Arduino IO object.
Parameters
----------
if_id : int
The interface ID (3) corresponding to (ARDUINO).
index: int
The index of the Arduino pin, from 0 to 19.
direction : str
Input 'in' or output 'out'.
"""
if not if_id in [ARDUINO]:
raise ValueError("No such IOP for Arduino device.")
if (index not in range(20)):
raise ValueError("Valid pin indexes are 0 - 19.")
if (direction not in ['in', 'out']):
raise ValueError("Direction can only be 'in', or 'out'.")
self.iop = DevMode(if_id, iop_const.ARDUINO_SWCFG_DIOALL)
self.index = index
self.direction = direction
self.iop.start()
if self.index in range(2):
if (self.direction == 'in'):
self.iop.write_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_TRI_OFFSET, \
iop_const.ARDUINO_CFG_UART_ALLINPUT)
else:
self.iop.write_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_TRI_OFFSET, \
iop_const.ARDUINO_CFG_UART_ALLOUTPUT)
elif self.index in range(2, 14):
if (self.direction == 'in'):
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_DIO_ALLINPUT)
else:
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_DIO_ALLOUTPUT)
else:
if (self.direction == 'in'):
self.iop.write_cmd(iop_const.ARDUINO_AIO_BASEADDR + \
iop_const.ARDUINO_AIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_AIO_ALLINPUT)
else:
self.iop.write_cmd(iop_const.ARDUINO_AIO_BASEADDR + \
iop_const.ARDUINO_AIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_AIO_ALLOUTPUT)
self.iop.load_switch_config()
def write(self, value):
"""Send the value to the offboard Arduino IO device.
Note
----
Only use this function when direction is 'out'.
Parameters
----------
value : int
The value to be written to the Arduino IO device.
Returns
-------
None
"""
if not value in (0, 1):
raise ValueError("Arduino IO can only write 0 or 1.")
if not self.direction == 'out':
raise ValueError('Arduino IO used as output, declared as input.')
if self.index in range(2):
if value:
curVal = self.iop.read_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_DATA_OFFSET)
newVal = curVal | (0x1 << self.index)
self.iop.write_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_DATA_OFFSET, newVal)
else:
curVal = self.iop.read_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_DATA_OFFSET)
newVal = curVal & (0xffffffff ^ (0x1 << self.index))
self.iop.write_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_DATA_OFFSET, newVal)
elif self.index in range(2, 14):
if value:
curVal = self.iop.read_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET)
newVal = curVal | (0x1 << (self.index - 2))
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET, newVal)
else:
curVal = self.iop.read_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET)
newVal = curVal & (0xffffffff ^ (0x1 << (self.index - 2)))
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET, newVal)
else:
if value:
curVal = self.iop.read_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET)
newVal = curVal | (0x1 << (self.index - 14))
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET, newVal)
else:
curVal = self.iop.read_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET)
newVal = curVal & (0xffffffff ^ (0x1 << (self.index - 14)))
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET, newVal)
def read(self):
"""Receive the value from the offboard Arduino IO device.
Note
----
Only use this function when direction is 'in'.
Parameters
----------
None
Returns
-------
int
The data (0 or 1) on the specified Arduino IO pin.
"""
if not self.direction == 'in':
raise ValueError('Arduino IO used as input, declared as output.')
if self.index in range(2):
raw_value = self.iop.read_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_DATA_OFFSET)
return (raw_value >> (self.index)) & 0x1
elif self.index in range(2, 14):
raw_value = self.iop.read_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET)
return (raw_value >> (self.index - 2)) & 0x1
else:
raw_value = self.iop.read_cmd(iop_const.ARDUINO_AIO_BASEADDR + \
iop_const.ARDUINO_AIO_DATA_OFFSET)
return (raw_value >> (self.index - 14)) & 0x1
def _state(self):
"""Retrieve the current state of the Arduino IO.
This function is usually used for debug purpose. Users should still
rely on read() or write() to get/put a value.
Parameters
----------
None
Returns
-------
int
The data (0 or 1) on the specified Arduino IO pin.
"""
if self.index in range(2):
raw_value = self.iop.read_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_DATA_OFFSET)
return (raw_value >> (self.index)) & 0x1
elif self.index in range(2, 14):
raw_value = self.iop.read_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET)
return (raw_value >> (self.index - 2)) & 0x1
else:
raw_value = self.iop.read_cmd(iop_const.ARDUINO_AIO_BASEADDR + \
iop_const.ARDUINO_AIO_DATA_OFFSET)
return (raw_value >> (self.index - 14)) & 0x1
class Arduino_IO(object):
"""This class controls the Arduino IO pins as inputs or outputs.
Note
----
The parameter 'direction' determines whether the instance is input/output:
'in' : receiving input from offchip to onchip.
'out' : sending output from onchip to offchip.
Note
----
The index of the Arduino pins:
upper row, from right to left: {0, 1, ..., 13}. (D0 - D13)
lower row, from left to right: {14, 15,..., 19}. (A0 - A5)
Attributes
----------
iop : _IOP
The _IOP object returned from the DevMode.
index : int
The index of the Arduino pin, from 0 to 19.
direction : str
Input 'in' or output 'out'.
"""
def __init__(self, if_id, index, direction):
"""Return a new instance of a Arduino IO object.
Parameters
----------
if_id : int
The interface ID (3) corresponding to (ARDUINO).
index: int
The index of the Arduino pin, from 0 to 19.
direction : str
Input 'in' or output 'out'.
"""
if not if_id in [ARDUINO]:
raise ValueError("No such IOP for Arduino device.")
if (index not in range(20)):
raise ValueError("Valid pin indexes are 0 - 19.")
if (direction not in ['in', 'out']):
raise ValueError("Direction can only be 'in', or 'out'.")
self.iop = DevMode(if_id, iop_const.ARDUINO_SWCFG_DIOALL)
self.index = index
self.direction = direction
self.iop.start()
if self.index in range(2):
if (self.direction == 'in'):
self.iop.write_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_TRI_OFFSET, \
iop_const.ARDUINO_CFG_UART_ALLINPUT)
else:
self.iop.write_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_TRI_OFFSET, \
iop_const.ARDUINO_CFG_UART_ALLOUTPUT)
elif self.index in range(2,14):
if (self.direction == 'in'):
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_DIO_ALLINPUT)
else:
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_DIO_ALLOUTPUT)
else:
if (self.direction == 'in'):
self.iop.write_cmd(iop_const.ARDUINO_AIO_BASEADDR + \
iop_const.ARDUINO_AIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_AIO_ALLINPUT)
else:
self.iop.write_cmd(iop_const.ARDUINO_AIO_BASEADDR + \
iop_const.ARDUINO_AIO_TRI_OFFSET, \
iop_const.ARDUINO_CFG_AIO_ALLOUTPUT)
self.iop.load_switch_config()
def write(self, value):
"""Send the value to the offboard Arduino IO device.
Note
----
Only use this function when direction is 'out'.
Parameters
----------
value : int
The value to be written to the Arduino IO device.
Returns
-------
None
"""
if not value in (0,1):
raise ValueError("Arduino IO can only write 0 or 1.")
if not self.direction == 'out':
raise ValueError('Arduino IO used as output, declared as input.')
if self.index in range(2):
if value:
curVal = self.iop.read_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_DATA_OFFSET)
newVal = curVal | (0x1<<self.index)
self.iop.write_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_DATA_OFFSET, newVal)
else:
curVal = self.iop.read_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_DATA_OFFSET)
newVal = curVal & (0xffffffff ^ (0x1<<self.index))
self.iop.write_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_DATA_OFFSET, newVal)
elif self.index in range(2,14):
if value:
curVal = self.iop.read_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET)
newVal = curVal | (0x1<<(self.index-2))
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET, newVal)
else:
curVal = self.iop.read_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET)
newVal = curVal & (0xffffffff ^ (0x1<<(self.index-2)))
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET, newVal)
else:
if value:
curVal = self.iop.read_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET)
newVal = curVal | (0x1<<(self.index-14))
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET, newVal)
else:
curVal = self.iop.read_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET)
newVal = curVal & (0xffffffff ^ (0x1<<(self.index-14)))
self.iop.write_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET, newVal)
def read(self):
"""Receive the value from the offboard Arduino IO device.
Note
----
Only use this function when direction is 'in'.
Parameters
----------
None
Returns
-------
int
The data (0 or 1) on the specified Arduino IO pin.
"""
if not self.direction == 'in':
raise ValueError('Arduino IO used as input, declared as output.')
if self.index in range(2):
raw_value = self.iop.read_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_DATA_OFFSET)
return (raw_value >> (self.index)) & 0x1
elif self.index in range(2,14):
raw_value = self.iop.read_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET)
return (raw_value >> (self.index-2)) & 0x1
else:
raw_value = self.iop.read_cmd(iop_const.ARDUINO_AIO_BASEADDR + \
iop_const.ARDUINO_AIO_DATA_OFFSET)
return (raw_value >> (self.index-14)) & 0x1
def _state(self):
"""Retrieve the current state of the Arduino IO.
This function is usually used for debug purpose. Users should still
rely on read() or write() to get/put a value.
Parameters
----------
None
Returns
-------
int
The data (0 or 1) on the specified Arduino IO pin.
"""
if self.index in range(2):
raw_value = self.iop.read_cmd(iop_const.ARDUINO_UART_BASEADDR + \
iop_const.ARDUINO_UART_DATA_OFFSET)
return (raw_value >> (self.index)) & 0x1
elif self.index in range(2,14):
raw_value = self.iop.read_cmd(iop_const.ARDUINO_DIO_BASEADDR + \
iop_const.ARDUINO_DIO_DATA_OFFSET)
return (raw_value >> (self.index-2)) & 0x1
else:
raw_value = self.iop.read_cmd(iop_const.ARDUINO_AIO_BASEADDR + \
iop_const.ARDUINO_AIO_DATA_OFFSET)
return (raw_value >> (self.index-14)) & 0x1
class Pmod_IIC(object):
"""This class controls the Pmod IIC pins.
Note
----
The index of the Pmod pins:
upper row, from left to right: {vdd,gnd,3,2,1,0}.
lower row, from left to right: {vdd,gnd,7,6,5,4}.
Attributes
----------
iop : _IOP
The _IOP object returned from the DevMode.
scl_pin : int
The SCL pin number.
sda_pin : int
The SDA pin number.
iic_addr : int
The IIC device address.
sr_addr : int
The IIC device SR address (base address + 0x104).
dtr_addr : int
The IIC device DTR address (base address + 0x108).
cr_addr : int
The IIC device CR address (base address + 0x100).
rfd_addr : int
The IIC device RFD address (base address + 0x120).
drr_addr : int
The IIC device DRR address (base address + 0x10C).
"""
def __init__(self, if_id, scl_pin, sda_pin, iic_addr):
"""Return a new instance of a Pmod IIC object.
Parameters
----------
if_id : int
The interface ID (1, 2) corresponding to (PMODA, PMODB).
scl_pin : int
The SCL pin number.
sda_pin : int
The SDA pin number.
iic_addr : int
The IIC device address.
"""
if not if_id in [PMODA, PMODB]:
raise ValueError("No such IOP for Pmod device.")
if (scl_pin not in range(8)):
raise ValueError("Valid SCL pin numbers are 0 - 7.")
if (sda_pin not in range(8)):
raise ValueError("Valid SDA pin numbers are 0 - 7.")
switchconfig = []
for i in range(8):
if i == sda_pin:
switchconfig.append(iop_const.PMOD_SWCFG_IIC0_SDA)
elif i == scl_pin:
switchconfig.append(iop_const.PMOD_SWCFG_IIC0_SCL)
else:
switchconfig.append(iop_const.PMOD_SWCFG_DIO0)
self.iop = DevMode(if_id, switchconfig)
self.iop.start()
self.iop.load_switch_config(switchconfig)
self.iic_addr = iic_addr
# Useful IIC controller addresses
self.sr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_SR_REG_OFFSET
self.dtr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_DTR_REG_OFFSET
self.cr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_CR_REG_OFFSET
self.rfd_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_RFD_REG_OFFSET
self.drr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_DRR_REG_OFFSET
def _iic_enable(self):
"""This method enables the IIC drivers.
The correct sequence to enable the drivers is:
1. Disale the IIC core.
2. Set the Rx FIFO depth to maximum.
3. Reset the IIC core and flush the Tx FIFO.
4. Enable the IIC core.
Note
----
This function is only required during initialization.
Parameters
----------
None
Returns
-------
None
"""
# Disable the IIC core
self.iop.write_cmd(self.cr_addr, 0x00)
# Set the Rx FIFO depth to maximum
self.iop.write_cmd(self.rfd_addr, 0x0F)
# Reset the IIC core and flush the Tx FIFO
self.iop.write_cmd(self.cr_addr, 0x02)
# Enable the IIC core
self.iop.write_cmd(self.cr_addr, 0x01)
sleep(I2C_DELAY)
def send(self, iic_bytes):
"""This method sends the command or data to the driver.
Parameters
----------
iic_bytes : list
A list of 8-bit bytes to be sent to the driver.
Returns
-------
None
Raises
------
RuntimeError
Timeout when waiting for the FIFO to be empty.
"""
# Enable IIC Core
self._iic_enable()
# Transmit 7-bit address and Write bit (with START)
self.iop.write_cmd(self.dtr_addr, 0x100 | (self.iic_addr << 1))
# Iteratively write into Tx FIFO, wait for it to be empty
for tx_cnt in range(len(iic_bytes)):
timeout = 100
# Construct the TX word
if (tx_cnt == len(iic_bytes) - 1):
tx_word = (0x200 | iic_bytes[tx_cnt])
else:
tx_word = iic_bytes[tx_cnt]
# Write data
self.iop.write_cmd(self.dtr_addr, tx_word)
while ((timeout > 0) and \
((self.iop.read_cmd(self.sr_addr) & 0x80) == 0x00)):
timeout -= 1
if (timeout == 0):
raise RuntimeError("Timeout when writing IIC.")
sleep(I2C_DELAY)
def receive(self, num_bytes):
"""This method receives IIC bytes from the device.
Parameters
----------
num_bytes : int
Number of bytes to be received from the device.
Returns
-------
iic_bytes : list
A list of 8-bit bytes received from the driver.
Raises
------
RuntimeError
Timeout when waiting for the RX FIFO to fill.
"""
# Reset the IIC core and flush the Tx FIFO
self.iop.write_cmd(self.cr_addr, 0x02)
# Set the Rx FIFO depth to one byte
self.iop.write_cmd(self.rfd_addr, 0x0)
# Transmit 7-bit address and Read bit
self.iop.write_cmd(self.dtr_addr, 0x101 | (self.iic_addr << 1))
# Enable the IIC core
cr_reg = 0x05
if num_bytes == 1:
cr_reg |= 0x10
self.iop.write_cmd(self.cr_addr,cr_reg)
sleep(I2C_DELAY)
# Program IIC Core to read num_bytes bytes and issue STOP
self.iop.write_cmd(self.dtr_addr, 0x200 + num_bytes)
# Read num_bytes from RX FIFO
iic_bytes = list()
while(len(iic_bytes) < num_bytes):
# Special condition for last two bytes
if (num_bytes - len(iic_bytes)) == 1:
self.iop.write_cmd(self.cr_addr,0x1)
elif (num_bytes - len(iic_bytes)) == 2:
self.iop.write_cmd(self.cr_addr, \
self.iop.read_cmd(self.cr_addr) | 0x10)
# Wait for data to be available in RX FIFO
timeout = 100
while(((self.iop.read_cmd(self.sr_addr) & 0x40) == 0x40) and \
(timeout > 0)):
timeout -= 1
if(timeout == 0):
raise RuntimeError("Timeout when reading IIC.")
# Read data
iic_bytes.append((self.iop.read_cmd(self.drr_addr) & 0xff))
sleep(I2C_DELAY)
return iic_bytes
class Pmod_LED8(object):
"""This class controls a single LED on the LED8 Pmod.
The Pmod LED8 (PB 200-163) has eight high-brightness LEDs. Each LED can be
individually illuminated from a logic high signal.
Attributes
----------
iop : _IOP
I/O processor instance used by LED8.
index : int
Index of the pin on LED8, from 0 to 7.
"""
def __init__(self, if_id, index):
"""Return a new instance of a LED object.
Parameters
----------
if_id : int
The interface ID (1, 2) corresponding to (PMODA, PMODB).
index: int
The index of the pin in a Pmod, from 0 to 7.
"""
if not if_id in [PMODA, PMODB]:
raise ValueError("No such IOP for Pmod device.")
if not index in range(8):
raise ValueError("Valid pin indexes are 0 - 7.")
self.iop = DevMode(if_id, iop_const.PMOD_SWCFG_DIOALL)
self.index = index
self.iop.start()
self.iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_TRI_OFFSET, \
iop_const.PMOD_CFG_DIO_ALLOUTPUT)
self.iop.load_switch_config()
def toggle(self):
"""Flip the bit of a single LED.
Note
----
The LED will be turned off if it is on. Similarly, it will be turned
on if it is off.
Parameters
----------
None
Returns
-------
None
"""
curr_val = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
new_val = (curr_val) ^ (0x1 << self.index)
self._set_leds_values(new_val)
def on(self):
"""Turn on a single LED.
Parameters
----------
None
Returns
-------
None
"""
curr_val = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
new_val = (curr_val) | (0x1 << self.index)
self._set_leds_values(new_val)
def off(self):
"""Turn off a single LED.
Parameters
----------
None
Returns
-------
None
"""
curr_val = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
new_val = (curr_val) & (0xff ^ (0x1 << self.index))
self._set_leds_values(new_val)
def write(self, value):
"""Set the LED state according to the input value
Note
----
This method does not take into account the current LED state.
Parameters
----------
value : int
Turn on the LED if value is 1; turn it off if value is 0.
Returns
-------
None
"""
if not value in (0, 1):
raise ValueError("LED8 can only write 0 or 1.")
if value:
self.on()
else:
self.off()
def read(self):
"""Retrieve the LED state.
Parameters
----------
None
Returns
-------
int
The data (0 or 1) read out from the selected pin.
"""
curr_val = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
return (curr_val >> self.index) & 0x1
def _set_leds_values(self, value):
"""Set the state for all the LEDs.
Note
----
Should not be used directly. User should rely on toggle(), on(),
off(), write(), and read() instead.
Parameters
----------
value : int
The state of all the LEDs encoded in one single value
Returns
-------
None
"""
self.iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET, value)
class Pmod_LED8(object):
"""This class controls a single LED on the LED8 Pmod.
The Pmod LED8 (PB 200-163) has eight high-brightness LEDs. Each LED can be
individually illuminated from a logic high signal.
Attributes
----------
iop : _IOP
I/O processor instance used by LED8.
index : int
Index of the pin on LED8, from 0 to 7.
"""
def __init__(self, if_id, index):
"""Return a new instance of a LED object.
Parameters
----------
if_id : int
The interface ID (1, 2) corresponding to (PMODA, PMODB).
index: int
The index of the pin in a Pmod, from 0 to 7.
"""
if not if_id in [PMODA, PMODB]:
raise ValueError("No such IOP for Pmod device.")
if not index in range(8):
raise ValueError("Valid pin indexes are 0 - 7.")
self.iop = DevMode(if_id, iop_const.PMOD_SWCFG_DIOALL)
self.index = index
self.iop.start()
self.iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_TRI_OFFSET, \
iop_const.PMOD_CFG_DIO_ALLOUTPUT)
self.iop.load_switch_config()
def toggle(self):
"""Flip the bit of a single LED.
Note
----
The LED will be turned off if it is on. Similarly, it will be turned
on if it is off.
Parameters
----------
None
Returns
-------
None
"""
curr_val = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
new_val = (curr_val) ^ (0x1 << self.index)
self._set_leds_values(new_val)
def on(self):
"""Turn on a single LED.
Parameters
----------
None
Returns
-------
None
"""
curr_val = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
new_val = (curr_val) | (0x1 << self.index)
self._set_leds_values(new_val)
def off(self):
"""Turn off a single LED.
Parameters
----------
None
Returns
-------
None
"""
curr_val = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
new_val = (curr_val) & (0xff ^ (0x1 << self.index))
self._set_leds_values(new_val)
def write(self, value):
"""Set the LED state according to the input value
Note
----
This method does not take into account the current LED state.
Parameters
----------
value : int
Turn on the LED if value is 1; turn it off if value is 0.
Returns
-------
None
"""
if not value in (0,1):
raise ValueError("LED8 can only write 0 or 1.")
if value:
self.on()
else:
self.off()
def read(self):
"""Retrieve the LED state.
Parameters
----------
None
Returns
-------
int
The data (0 or 1) read out from the selected pin.
"""
curr_val = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
return (curr_val >> self.index) & 0x1
def _set_leds_values(self, value):
"""Set the state for all the LEDs.
Note
----
Should not be used directly. User should rely on toggle(), on(),
off(), write(), and read() instead.
Parameters
----------
value : int
The state of all the LEDs encoded in one single value
Returns
-------
None
"""
self.iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET, value)
class Pmod_IO(object):
"""This class controls the Pmod IO pins as inputs or outputs.
Note
----
The parameter 'direction' determines whether the instance is input/output:
'in' : receiving input from offchip to onchip.
'out' : sending output from onchip to offchip.
The index of the Pmod pins:
upper row, from left to right: {vdd,gnd,3,2,1,0}.
lower row, from left to right: {vdd,gnd,7,6,5,4}.
Attributes
----------
iop : _IOP
The _IOP object returned from the DevMode.
index : int
The index of the Pmod pin, from 0 to 7.
direction : str
Input 'in' or output 'out'.
"""
def __init__(self, if_id, index, direction):
"""Return a new instance of a Pmod IO object.
Parameters
----------
if_id : int
The interface ID (1, 2) corresponding to (PMODA, PMODB).
index: int
The index of the Pmod pin, from 0 to 7.
direction : str
Input 'in' or output 'out'.
"""
if not if_id in [PMODA, PMODB]:
raise ValueError("No such IOP for Pmod device.")
if not index in range(8):
raise ValueError("Valid pin indexes are 0 - 7.")
if not direction in ['in', 'out']:
raise ValueError("Direction can only be 'in', or 'out'.")
self.iop = DevMode(if_id, iop_const.PMOD_SWCFG_DIOALL)
self.index = index
self.direction = direction
self.iop.start()
if self.direction == 'in':
self.iop.write_cmd(
iop_const.PMOD_DIO_BASEADDR + iop_const.PMOD_DIO_TRI_OFFSET,
iop_const.PMOD_CFG_DIO_ALLINPUT)
else:
self.iop.write_cmd(
iop_const.PMOD_DIO_BASEADDR + iop_const.PMOD_DIO_TRI_OFFSET,
iop_const.PMOD_CFG_DIO_ALLOUTPUT)
self.iop.load_switch_config()
def write(self, value):
"""Send the value to the offboard Pmod IO device.
Note
----
Only use this function when direction is 'out'.
Parameters
----------
value : int
The value to be written to the Pmod IO device.
Returns
-------
None
"""
if not value in (0, 1):
raise ValueError("Pmod IO can only write 0 or 1.")
if not self.direction == 'out':
raise ValueError('Pmod IO used as output, declared as input.')
if value:
cur_val = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
new_val = cur_val | (0x1 << self.index)
self.iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET, new_val)
else:
cur_val = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
new_val = cur_val & (0xff ^ (0x1 << self.index))
self.iop.write_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET, new_val)
def read(self):
"""Receive the value from the offboard Pmod IO device.
Note
----
Only use this function when direction is 'in'.
Returns
-------
int
The data (0 or 1) on the specified Pmod IO pin.
"""
if not self.direction == 'in':
raise ValueError('Pmod IO used as input, but declared as output.')
raw_value = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
return (raw_value >> self.index) & 0x1
def _state(self):
"""Retrieve the current state of the Pmod IO.
This function is usually used for debug purpose. Users should still
rely on read() or write() to get/put a value.
Returns
-------
int
The data (0 or 1) on the specified Pmod IO pin.
"""
raw_value = self.iop.read_cmd(iop_const.PMOD_DIO_BASEADDR + \
iop_const.PMOD_DIO_DATA_OFFSET)
return (raw_value >> self.index) & 0x1
class Pmod_IIC(object):
"""This class controls the Pmod IIC pins.
Note
----
The index of the Pmod pins:
upper row, from left to right: {vdd,gnd,3,2,1,0}.
lower row, from left to right: {vdd,gnd,7,6,5,4}.
Attributes
----------
iop : _IOP
The _IOP object returned from the DevMode.
scl_pin : int
The SCL pin number.
sda_pin : int
The SDA pin number.
iic_addr : int
The IIC device address.
sr_addr : int
The IIC device SR address (base address + 0x104).
dtr_addr : int
The IIC device DTR address (base address + 0x108).
cr_addr : int
The IIC device CR address (base address + 0x100).
rfd_addr : int
The IIC device RFD address (base address + 0x120).
drr_addr : int
The IIC device DRR address (base address + 0x10C).
"""
def __init__(self, if_id, scl_pin, sda_pin, iic_addr):
"""Return a new instance of a Pmod IIC object.
Parameters
----------
if_id : int
The interface ID (1, 2) corresponding to (PMODA, PMODB).
scl_pin : int
The SCL pin number.
sda_pin : int
The SDA pin number.
iic_addr : int
The IIC device address.
"""
if not if_id in [PMODA, PMODB]:
raise ValueError("No such IOP for Pmod device.")
if scl_pin not in range(8):
raise ValueError("Valid SCL pin numbers are 0 - 7.")
if sda_pin not in range(8):
raise ValueError("Valid SDA pin numbers are 0 - 7.")
switchconfig = []
for i in range(8):
if i == sda_pin:
switchconfig.append(iop_const.PMOD_SWCFG_IIC0_SDA)
elif i == scl_pin:
switchconfig.append(iop_const.PMOD_SWCFG_IIC0_SCL)
else:
switchconfig.append(iop_const.PMOD_SWCFG_DIO0)
self.iop = DevMode(if_id, switchconfig)
self.iop.start()
self.iop.load_switch_config(switchconfig)
self.iic_addr = iic_addr
# Useful IIC controller addresses
self.sr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_SR_REG_OFFSET
self.dtr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_DTR_REG_OFFSET
self.cr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_CR_REG_OFFSET
self.rfd_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_RFD_REG_OFFSET
self.drr_addr = iop_const.PMOD_XIIC_0_BASEADDR + \
iop_const.PMOD_XIIC_DRR_REG_OFFSET
def _iic_enable(self):
"""This method enables the IIC drivers.
The correct sequence to enable the drivers is:
1. Disale the IIC core.
2. Set the Rx FIFO depth to maximum.
3. Reset the IIC core and flush the Tx FIFO.
4. Enable the IIC core.
Note
----
This function is only required during initialization.
Parameters
----------
None
Returns
-------
None
"""
# Disable the IIC core
self.iop.write_cmd(self.cr_addr, 0x00)
# Set the Rx FIFO depth to maximum
self.iop.write_cmd(self.rfd_addr, 0x0F)
# Reset the IIC core and flush the Tx FIFO
self.iop.write_cmd(self.cr_addr, 0x02)
# Enable the IIC core
self.iop.write_cmd(self.cr_addr, 0x01)
sleep(I2C_DELAY)
def send(self, iic_bytes):
"""This method sends the command or data to the driver.
Parameters
----------
iic_bytes : list
A list of 8-bit bytes to be sent to the driver.
Returns
-------
None
Raises
------
RuntimeError
Timeout when waiting for the FIFO to be empty.
"""
# Enable IIC Core
self._iic_enable()
# Transmit 7-bit address and Write bit (with START)
self.iop.write_cmd(self.dtr_addr, 0x100 | (self.iic_addr << 1))
# Iteratively write into Tx FIFO, wait for it to be empty
for tx_cnt in range(len(iic_bytes)):
timeout = 100
# Construct the TX word
if tx_cnt == len(iic_bytes) - 1:
tx_word = (0x200 | iic_bytes[tx_cnt])
else:
tx_word = iic_bytes[tx_cnt]
# Write data
self.iop.write_cmd(self.dtr_addr, tx_word)
while ((timeout > 0)
and ((self.iop.read_cmd(self.sr_addr) & 0x80) == 0x00)):
timeout -= 1
if timeout == 0:
raise RuntimeError("Timeout when writing IIC.")
sleep(I2C_DELAY)
def receive(self, num_bytes):
"""This method receives IIC bytes from the device.
Parameters
----------
num_bytes : int
Number of bytes to be received from the device.
Returns
-------
iic_bytes : list
A list of 8-bit bytes received from the driver.
Raises
------
RuntimeError
Timeout when waiting for the RX FIFO to fill.
"""
# Reset the IIC core and flush the Tx FIFO
self.iop.write_cmd(self.cr_addr, 0x02)
# Set the Rx FIFO depth to one byte
self.iop.write_cmd(self.rfd_addr, 0x0)
# Transmit 7-bit address and Read bit
self.iop.write_cmd(self.dtr_addr, 0x101 | (self.iic_addr << 1))
# Enable the IIC core
cr_reg = 0x05
if num_bytes == 1:
cr_reg |= 0x10
self.iop.write_cmd(self.cr_addr, cr_reg)
sleep(I2C_DELAY)
# Program IIC Core to read num_bytes bytes and issue STOP
self.iop.write_cmd(self.dtr_addr, 0x200 + num_bytes)
# Read num_bytes from RX FIFO
iic_bytes = list()
while len(iic_bytes) < num_bytes:
# Special condition for last two bytes
if (num_bytes - len(iic_bytes)) == 1:
self.iop.write_cmd(self.cr_addr, 0x1)
elif (num_bytes - len(iic_bytes)) == 2:
self.iop.write_cmd(self.cr_addr,
self.iop.read_cmd(self.cr_addr) | 0x10)
# Wait for data to be available in RX FIFO
timeout = 100
while (((self.iop.read_cmd(self.sr_addr) & 0x40) == 0x40)
and (timeout > 0)):
timeout -= 1
if timeout == 0:
raise RuntimeError("Timeout when reading IIC.")
# Read data
iic_bytes.append((self.iop.read_cmd(self.drr_addr) & 0xff))
sleep(I2C_DELAY)
return iic_bytes