def setup(self): """ Set up the connection to the device """ # Set up the IO expander wiringpi2.wiringPiI2CWriteReg8(self.device, self.GPIO, 0x00) # Clear outputs wiringpi2.wiringPiI2CWriteReg8(self.device, self.IODIR, 0x00) # Direction wiringpi2.wiringPiI2CWriteReg8(self.device, self.GPPU, 0x00) # Pull ups wiringpi2.wiringPiI2CWriteReg8(self.device, self.IPOL, 0x00) # Polarity # Initialise the display in 4 bit mode self._writeLCD(0x33, True) self._writeLCD(0x32, True) self._writeLCD(0x28, True) # Set up initial state self._writeLCD(0x0C, True) self._writeLCD(0x06, True) self._writeLCD(0x01, True)
def LCD8bit(writeByte, type, fd): writeByte = writeByte>>4#clear the lower nibble since it isn't used writeByte = writeByte<<4 if(type): value = 4 #set bit 2 writeByte = writeByte|value# set CD to 1 for data (bit2) #=====================================================write wp.wiringPiI2CWriteReg8(fd, reg, writeByte) wp.delayMicroseconds(10) value = 8 writeByte = writeByte|value #pulse enable pin (bit3) wp.wiringPiI2CWriteReg8(fd, reg, writeByte) wp.delayMicroseconds(10) writeByte = writeByte^value#clear enable pin wp.wiringPiI2CWriteReg8(fd, reg, writeByte) wp.delayMicroseconds(10) return
#!/usr/bin/python
import time
import wiringpi2 as wpi
i2c_dev = "/dev/i2c-1"
i2c_addr = 0x62
wpi.wiringPiSetup()
i2c_fd = wpi.wiringPiI2CSetupInterface(i2c_dev, i2c_addr)
writeResult = wpi.wiringPiI2CWriteReg8(i2c_fd, 0x1e, 0x00)
print("write result: " + str(writeResult))
reg_addr = 0x00
while (reg_addr <= 101):
#print("testing address: " + str(reg_addr))
if (reg_addr != 30):
output = wpi.wiringPiI2CReadReg8(i2c_fd, (reg_addr))
print(hex(reg_addr) + ":" + "{0:b}".format(output))
#print("\n")
time.sleep(0.01)
reg_addr += 1
#print("before: " + str(i2c_fd))
#wpi.wiringPiI2CRead(i2c_fd)
#wpi.wiringPiI2CWriteReg8(i2c_fd, 0x00, 0x00)
def _writeLCD(self, value, cmd = False):
""" Write command or data to the LCD
"""
# Make Sure "EN" is 0 or low
wiringpi2.wiringPiI2CWriteReg8(self.device, self.GPIO, 0x00)
# Set "R/S" to 0 for a command, or 1 for data/characters
out = 0x00
if not cmd:
out = out | self.LCD_COMMAND
wiringpi2.wiringPiI2CWriteReg8(self.device, self.GPIO, out)
# Put the HIGH BYTE of the data/command on D7-4
out = out | ((value >> 4) & self.LCD_DATA)
wiringpi2.wiringPiI2CWriteReg8(self.device, self.GPIO, out)
# Set "EN" (EN= 1 or High)
out = out | self.LCD_ENABLE
wiringpi2.wiringPiI2CWriteReg8(self.device, self.GPIO, out)
# Wait At Least 450 ns!!!
sleep(self.PULSE)
# Clear "EN" (EN= 0 or Low)
out = out & ~self.LCD_ENABLE
wiringpi2.wiringPiI2CWriteReg8(self.device, self.GPIO, out)
# Wait 5ms for command writes, and 200us for data writes.
sleep(self.DELAY)
# Put the LOW BYTE of the data/command on D7-4
out = (out & ~self.LCD_DATA) | (value & self.LCD_DATA)
wiringpi2.wiringPiI2CWriteReg8(self.device, self.GPIO, out)
# Set "EN" (EN= 1 or High)
out = out | self.LCD_ENABLE
wiringpi2.wiringPiI2CWriteReg8(self.device, self.GPIO, out)
# Wait At Least 450 ns!!!
sleep(self.PULSE)
# Clear "EN" (EN= 0 or Low)
out = out & ~self.LCD_ENABLE
wiringpi2.wiringPiI2CWriteReg8(self.device, self.GPIO, out)
# Wait 5ms for command writes, and 200us for data writes.
sleep(self.DELAY)
def write8(self, register, write_val):
reg = register | TCS34725_COMMAND_BIT
retval = wiringpi2.wiringPiI2CWriteReg8(self.I2C_fd, reg, write_val)
if retval < 0:
raise Exception("write8 error")
def write(writeByte, type, fd): #===============================extract upper nibble value = writeByte #clear the lower nibble value = value>>4 value = value<<4 #place in register upperNibble = value #==================================extract lower nibble value = writeByte #move the lower nibble to the upper nibble value = value<<4 #place in register lowerNibble = value if(type): value = 4 #set bit 2 upperNibble = upperNibble|value# set CD to 1 for data (bit2) lowerNibble = lowerNibble|value #else CD is 0 for a command #=====================================================write upperNibble wp.wiringPiI2CWriteReg8(fd, reg, upperNibble) wp.delayMicroseconds(10) value = 8 upperNibble = upperNibble|value #pulse enable pin (bit3) wp.wiringPiI2CWriteReg8(fd, reg, upperNibble) wp.delayMicroseconds(10) upperNibble = upperNibble^value#clear enable pin wp.wiringPiI2CWriteReg8(fd, reg, upperNibble) wp.delayMicroseconds(10) #=====================================================write lowerNibble wp.wiringPiI2CWriteReg8(fd, reg, lowerNibble) wp.delayMicroseconds(10) value = 8 lowerNibble = lowerNibble|value #pulse enable pin (bit3) wp.wiringPiI2CWriteReg8(fd, reg, lowerNibble) wp.delayMicroseconds(10) lowerNibble = lowerNibble^value#clear enable pin wp.wiringPiI2CWriteReg8(fd, reg, lowerNibble) wp.delayMicroseconds(10) return
