- Mon Jan 19, 2015 9:05 pm
#7767
Amazing work you guys. I have been reading and trying for weeks to get an oled working and now might be able to get some progress.
What about integrating https://code.google.com/p/u8glib/ I was using this for an arduino project and love it!
What about integrating https://code.google.com/p/u8glib/ I was using this for an arduino project and love it!
gwizz wrote:I've been playing around with a 128x64 I2C oled, the cheapest I could find, SSD1306 based controller - I haven't gotten it working yet! It does make the display change, but I was expecting it to flash, and it doesn't.
I copied a bunch of stuff over from Adafruit's excellent arduino libraries (qudos to her, she's made a giant contribution).
I also saw a few other examples on the web and many did the init procedure in a different order.
I had to track down some commands and another init example from the datasheet.
If this helps anyone get started then great!!Code: Select all-- TODO fix this code so that it works. Anyone???
id=0 -- need this to identify (software) IC2 bus?
gpio= {[0]=3,[2]=4,[4]=2,[5]=1,[12]=6,[13]=7,[14]=5} -- this maps GPIO numbers to internal IO references
sda=gpio[12] -- connect to pin GPIO14
scl=gpio[14] -- connect to pin GPIO12
addr=0x3C -- the I2C address of our device
-- initialize i2c
i2c.setup(id,sda,scl,i2c.SLOW)
-- user defined function: read from reg_addr content of dev_addr
function read_reg(dev_addr, reg_addr)
i2c.start(id)
i2c.address(id, dev_addr ,i2c.TRANSMITTER)
i2c.write(id,reg_addr)
i2c.stop(id)
i2c.start(id)
i2c.address(id, dev_addr,i2c.RECEIVER)
c=i2c.read(id,1)
i2c.stop(id)
return c
end
function write_reg(dev_addr, reg_addr, reg_val)
i2c.start(id)
i2c.address(id, dev_addr, i2c.TRANSMITTER)
i2c.write(id, reg_addr)
i2c.write(id, reg_val)
i2c.stop(id)
end
function oled_command(cmd)
write_reg(addr,0,cmd)
end
function display()
oled_command(0x21) -- set column addresses
oled_command(0x00) -- reset column start address
oled_command(0x7F) -- reset column end address
oled_command(0x22) -- set page addresses
oled_command(0x00) -- reset page start address
oled_command(0x07) -- reset page end address
end
function init() -- Initialises the 128x64 oled
print("starting")
oled_command(0xAE) -- turn off oled panel
oled_command(0xA8) -- set multiplex ratio to 1 byte following
oled_command(0x3F) -- 1/64 duty (N+1 MUX: 1-64))
oled_command(0xD3) -- set display offset to 1 byte following
oled_command(0x00) -- no offset
oled_command(0x40) -- set start line address
oled_command(0xA0) -- set segment remap
oled_command(0xC0) -- set COM output scan direction
oled_command(0xDA) -- set com pins hardware configuration to 1 byte following
oled_command(0x12) -- set pins
oled_command(0x81) -- set contrast control register
oled_command(0x7f) -- reset contrast to default value
oled_command(0xA4) -- set display on
oled_command(0xA6) -- set normal display
oled_command(0xD5) -- set display clock divide ratio/oscillator frequency
oled_command(0x80) -- set divide ratio
oled_command(0x8D) -- set Charge Pump enable/disable
oled_command(0x14) -- set(0x10) disable
oled_command(0xAF) -- turn on oled panel
print("Init done")
end
init()
for a=1,20 do
display()
tmr.delay(100000)
tmr.wdclr()
oled_command(0xA7)
display()
tmr.delay(100000)
tmr.wdclr()
oled_command(0xA6)
display()
end
