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@cho45 cho45/rb.rb
Last active Jan 1, 2016

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#!/usr/bin/env ruby
# coding: utf-8
class I2CDevice
# ioctl command
# Ref. https://www.kernel.org/pub/linux/kernel/people/marcelo/linux-2.4/include/linux/i2c.h
I2C_RETRIES = 0x0701
I2C_TIMEOUT = 0x0702
I2C_SLAVE = 0x0703
I2C_SLAVE_FORCE = 0x0706
I2C_TENBIT = 0x0704
I2C_FUNCS = 0x0705
I2C_RDWR = 0x0707
I2C_SMBUS = 0x0720
I2C_UDELAY = 0x0705
I2C_MDELAY = 0x0706
attr_accessor :address
def initialize(address)
@address = address
end
def i2cget(address, length=1)
i2c = File.open("/dev/i2c-1", "r+")
i2c.ioctl(I2C_SLAVE, @address)
i2c.write(address.chr)
ret = i2c.read(length)
i2c.close
ret
end
def i2cset(*data)
i2c = File.open("/dev/i2c-1", "r+")
i2c.ioctl(I2C_SLAVE, @address)
i2c.write(data.pack("C*"))
i2c.close
end
end
class ACM1602NI < I2CDevice
MAP = Hash[
[
"。「」、・ヲァィゥェォャュョッーアイウエオカキクケコサシスセソタチツテトナニヌネノハヒフヘホマミムメモヤユヨラリルレロワン゙゚".split(//).map {|c|
c.force_encoding(Encoding::BINARY)
},
(0xa1..0xdf).map {|c|
c.chr
}
].transpose
]
def initialize
super(0x50)
initialize_lcd
end
undef i2cget
def initialize_lcd
# function set
i2cset(0, 0b00111100)
sleep 53e-6
# display on/off control
i2cset(0, 0b00001100)
sleep 53e-6
clear
end
def clear
i2cset(0, 0b00000001)
sleep 2.16e-3
end
def put_line(line, str)
str.force_encoding(Encoding::BINARY)
str.gsub!(/#{MAP.keys.join('|')}/, MAP)
str = "%- 16s" % str
# set ddram address
i2cset(0, 0b10000000 + (0x40 * line))
sleep 53e-6
i2cset(*str.unpack("C*").map {|i| [0x80, i] }.flatten)
sleep 53e-6
end
# Usage:
# lcd.define_character(0, [
# 0,1,1,1,0,
# 1,0,0,0,1,
# 1,1,0,1,1,
# 1,0,1,0,1,
# 1,1,0,1,1,
# 1,0,0,0,1,
# 1,0,0,0,1,
# 0,1,1,1,0,
# ])
def define_character(n, array)
raise "n < 8" unless n < 8
raise "array size must be 40 (5x8)" unless array.size == 40
array = array.each_slice(5).map {|i|
i.inject {|r,i| (r << 1) + i }
}
i2cset(0, 0b01000000 + (8 * n))
sleep 53e-6
i2cset(*array.map {|i| [0x80, i] }.flatten)
sleep 53e-6
end
end
class MPL115A2 < I2CDevice
def initialize
super(0x60)
coefficient = i2cget(0x04, 8).unpack("n*")
@a0 = fixed_point(coefficient[0], 12)
@b1 = fixed_point(coefficient[1], 2)
@b2 = fixed_point(coefficient[2], 1)
@c12 = fixed_point(coefficient[3], 0) / (1<<9)
p [@a0, @b1, @b2, @c12]
end
def fixed_point(fixed, int_bits)
msb = 15
deno = (1<<(msb-int_bits)).to_f
if (fixed & (1<<15)).zero?
fixed / deno
else
-( ( (~fixed & 0xffff) + 1) / deno )
end
end
def calculate_hPa
i2cset(0x12, 0x01) # CONVERT
sleep 0.003
data = i2cget(0x00, 4).unpack("n*")
p_adc = (data[0]) >> 6
t_adc = (data[1]) >> 6
p_comp = @a0 + (@b1 + @c12 * t_adc) * p_adc + @b2 * t_adc
hPa = p_comp * ( (1150 - 500) / 1023.0) + 500;
end
end
mpl = MPL115A2.new
loop do
puts "%d hPa" % mpl.calculate_hPa
sleep 0.5
end
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