def set_direction_bit(board, port, bit, value):
# select the correspondent device
if((port == "A") or (port == "B")):
selection.gpioAB(board)
else:
selection.gpioCD(board)
#-----------------------------------
# read current configuration
if((port == "A") or (port == "C")):
direction = int(gpio.OCR1_read())
else:
direction = int(gpio.OCR2_read())
print "direction BEFORE = " + str(direction)
#-----------------------------------
# if bit will be set as INPUT ("1" state), performs an "or" with previous byte
if (value):
direction = (direction | (1 << bit))
# if bit will be set as OUTPUT ("0" state), performs an "and" with previous byte
else:
# mask is an XOR of 0xFF and bit position
mask = 0xFF ^ (1 << bit)
direction = (direction & mask)
#-----------------------------------
# rewrite previous byte with bit updated
if((port == "A") or (port == "C")):
gpio.OCR1_write(direction)
else:
gpio.OCR2_write(direction)
print "direction AFTER = " + str(direction) + "\n=========================="
def read_digital_input_byte(board):
'''
input parameters:
- board: board address
- bit: bit position (MSB = 7, LSB = 0)
output parameters:
- byte read in digital Port A
----------------------------
description:
this function reads a full byte in digital port A.
'''
selection.gpioAB(board)
return gpio.GSR1()
def read_portB_digital_output_bit(board, bit_pos):
'''
input parameters:
- board: board address
- bit_pos: bit position (MSB = 7, LSB = 0)
output parameters:
- bit: value of the bit in position "pos"
----------------------------
description:
this function reads the setpoint of a single bit in digital port B.
'''
selection.gpioAB(board)
byte = int(gpio.OCR2_read())
# performs an "and" between byte and mask
mask = (1 << bit_pos)
bit = (byte & mask) >> bit_pos
return bit
def read_portB_digital_input_bit(board, bit_pos):
'''
input parameters:
- board: board address
- bit_pos: bit position (MSB = 7, LSB = 0)
output parameters:
- bit_val: value of the bit in position "pos"
----------------------------
description:
this function reads a single bit in digital port A.
'''
selection.gpioAB(board)
# digital.read() returns a string represented in hexadecimal (e.g.: '0x54')
byte = int(gpio.GSR2())
# performs an "and" between byte and mask
mask = (1 << bit_pos)
bit = (byte & mask) >> bit_pos
return bit
def set_direction_bit(board, port, bit, value):
'''
input parameters:
- board: board address
- port: pin port that will be configured (A, B, C or D)
- bit: bit position (MSB = 7, LSB = 0)
- value: "0" for OUTPUT
"1" for INPUT
output parameters:
- none
----------------------------
description:
this function defines the direction of a bit.
'''
global lock
with lock:
# select the correspondent device
if((port == "A") or (port == "B")):
selection.gpioAB(board)
else:
selection.gpioCD(board)
#-----------------------------------
# read current configuration
if((port == "A") or (port == "C")):
direction = int(gpio.OCR1_read())
else:
direction = int(gpio.OCR2_read())
#print "direction BEFORE = " + str(direction)
#-----------------------------------
# if bit will be set as INPUT ("1" state), performs an "or" with previous byte
if (value):
direction = (direction | (1 << bit))
# if bit will be set as OUTPUT ("0" state), performs an "and" with previous byte
else:
# mask is an XOR of 0xFF and bit position
mask = 0xFF ^ (1 << bit)
direction = (direction & mask)
#-----------------------------------
# rewrite previous byte with bit updated
if((port == "A") or (port == "C")):
gpio.OCR1_write(direction)
else:
gpio.OCR2_write(direction)
def set_digital_output_byte(board, value):
'''
input parameters:
- board: board address
- value: byte that will be written
output parameters:
- none
----------------------------
description:
this function writes a full byte in digital port B.
'''
#-----------------------------------
# update digital output stored value
global digital_output
digital_output = value
flash.sector_write(board, 0x68, [value])
#-----------------------------------
selection.gpioAB(board)
gpio.OCR2_write(value)
def config(board):
'''
input parameters:
- board: board address
output parameters:
- none
----------------------------
description:
this function configures the digital pins direction:
Port A: all pins are input
Port B: the 4 MSB are output and the 4 LSB are input
----------------------------
GCR:
0: configures that pin as OUTPUT.
1: configures that pin as INPUT.
TSCR:
0: DISABLE three-state mode.
1: ENABLE three-state mode.
'''
selection.gpioAB(board)
# enable tri-state mode in ports A and B
TSCR1_write(0xFF)
TSCR2_write(0xFF)
# set port A as input
GCR1_write(0xFF)
# set port B (4 inputs, 4 outputs)
GCR2_write(0xF0)
# set all initial outputs value low
OCR1_write(0x00)
OCR2_write(0x00)
# disable tri-state mode in ports A and B
TSCR1_write(0x00)
TSCR2_write(0x00)
#---------------------------------------------------
selection.gpioCD(board)
# enable tri-state mode in ports C and D
TSCR1_write(0xFF)
TSCR2_write(0xFF)
#=======================================================
# initial GPIO configuration
#=======================================================
'''
def set_portB_digital_output_bit(board, bit, value):
'''
input parameters:
- board: board address
- bit: bit position (MSB = 7, LSB = 0)
- value: "0" or "1"
output parameters:
- none
----------------------------
description:
this function modifies a single bit in digital port B.
'''
global lock
#-----------------------------------
# previous state stored in lower part of block 5 (0x050000)
# current state stored in upper part of block 5 (0x058000)
# restore digital output stored value
global digital_output
# read previous state
#digital_output = flash.read(board, 0x050000, 1)
#digital_output = digital_output[0]
#-----------------------------------
# if bit to be written is "1", performs an "or" with previous byte
if (value):
digital_output = (digital_output | (1 << bit))
# if bit to be written is "0", performs an "and" with previous byte
else:
# mask is an XOR of 0xFF and bit position
mask = 0xFF ^ (1 << bit)
digital_output = (digital_output & mask)
# rewrite previous byte with bit updated
#-----------------------------------
# write new digital output in current state address (0x058000)
#flash.sector_write(board, 0x058000, [digital_output, 0xFF])
# update digital output stored value in previous state (0x050000)
#flash.sector_write(board, 0x050000, [digital_output, 0xFF])
#-----------------------------------
with lock:
selection.gpioAB(board)
gpio.OCR2_write(digital_output)