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Project Description

Introduction

Python library for interfacing MOD-OLED-128x64 with OLinuXino boards. SSD1306 controller support SPI, I2C and parallel interface, but with this module only I2C is usable.

By default i2c-1 and i2c-2 buses use 100kHz clock. This means that you can achieve around 8 frames per second. You can use i2c-0 which in most OLinuXino boards is running at 400kHz (around 25 fps, because this bus is used also for the PMU module). You can speed things up by using smaller than 128x64 display area.

Requirements

This package needs the following modules:

  • smbus-cffi

Installation

From GitHub:

git clone https://github.com/SelfDestroyer/pyMOD-OLED.git
cd pyMOD-OLED
python setup.py install

From PyPi:

wget https://pypi.python.org/packages/source/m/mod-oled-128x64/mod-oled-128x64-0.0.3.tar.gz
tar -zxf mod-oled-128x64-0.0.3.tar.gz
cd mod-oled-128x64-0.0.3
python setup.py install

Using pip:

pip install mod-oled-128x64

Usage

There are 3 modules in this package:

  • OLED - Main class for control. Here you can make all the setup that you need.
  • Font - Contains basic font table and has ability to write characters from it.
  • Graphics - Basic drawing methods - pixel, line and circle.

To import module use:

from oled import OLED
from oled import Font
from oled import Graphics

Complete example:

from oled import OLED
from oled import Font
from oled import Graphics

# Connect to the display on /dev/i2c-0
dis = OLED(0)

# Start communication
dis.begin()

# Start basic initialization
dis.initialize()

# Do additional configuration
dis.set_memory_addressing_mode(0)
dis.set_column_address(0, 127)
dis.set_page_address(0, 7)

# Clear display
dis.clear()

# Set font scale x2
f = Font(2)

# Print some large text
f.print_string(6, 0, "OLIMEX LTD")

# Change font to 5x7
f.scale = 1
f.print_string(0, 24, "MOD-OLED-128x64")
f.print_string(0, 32, "olimex.com")

# Send video buffer to display
dis.update()

# Make horizontal scroll
dis.horizontal_scroll_setup(dis.LEFT_SCROLL, 3, 3, 7)
dis.activate_scroll()

# Only the last scroll setup is active
dis.horizontal_scroll_setup(dis.LEFT_SCROLL, 4, 4, 7)
dis.activate_scroll()

# Draw line
Graphics.draw_pixel(0, 0)
Graphics.draw_line(0, 60, 100, 63)
dis.update()

Classes and methods

class class oled.OLED(i2c, address=60)

activate_scroll()

Activate Scroll (2Fh)

This command starts the motion of scrolling and should only be issued after the scroll setup parameters have been defined by the scrolling setup commands :26h/27h/29h/2Ah . The setting in the last scrolling setup command overwrites the setting in the previous scrolling setup commands.

The following actions are prohibited after the scrolling is activated RAM access (Data write or read)

Changing the horizontal scroll setup parameters

begin()

Create communication object

charge_pump_setting(on)

Charge Pump Regulator (8Dh)

Parameters:
on – True - Enable charge pump during display on False - Disable charge pump(RESET)

clear(update=True)

Clear video buffer

Parameters:
update – If true send the empty buffer to the controller

close()

Close I2C bus and delete communication object

deactivate_scroll()

Deactivate scroll (2Eh)

This command stops the motion of scrolling. After sending 2Eh command to deactivate the scrolling action,the ram data needs to be rewritten.

entire_display_on(status)

Entire Display ON (A4h/A5h)

A4h command enable display outputs according to the GDDRAM contents.If A5h command is issued, then by using A4h command, the display will resume to the GDDRAM contents. In other words, A4h command resumes the display from entire display “ON” stage. A5h command forces the entire display to be “ON”, regardless of the contents of the display data RAM.

Parameters:
status – True - Entire display ON. Output ignores RAM content False - Resume to RAM content display (RESET). Output follows RAM content

horizontal_scroll_setup(direction, start_page, end_page, speed)

Horizontal Scroll Setup (26h/27h)

This command consists of consecutive bytes to set up the horizontal scroll parameters and determines the scrolling start page, end page and scrolling speed. Before issuing this command the horizontal scroll must be deactivated (2Eh). Otherwise, RAM content may be corrupted.

Parameters:
  • direction – 0 - Right Horizontal Scroll 1 - Left Horizontal Scroll
  • start_page – Define start page address - PAGE0 ~ PAGE7
  • end_page – Define end page address - PAGE0 ~ PAGE7
  • speed – Set time interval between each roll step in terms of frame frequency: 0 - 5 frames 1 - 64 frames 2 - 128 frames 3 - 256 frames 4 - 3 frames 5 - 4 frames 6 - 25 frames 7 - 2 frames
Raises ValueError:
Start page cannot be larger than end page

initialize()

Basic display initialization

send_data(data)

Send data in packets by 16 bytes

Parameters:
data – Data to be send

send_nop()

NOP (E3h)

No operation command

set_column_address(column_start_address, column_end_address)

Set Column Address (21h)

This triple byte command specifies column start address and end address of the display data RAM. This command also sets the column address pointer to column start address. This pointer is used to define the current read/write column address in graphic display data RAM. If horizontal address increment mode is enabled by command 20h, after finishing read/write one column data, it is incremented automatically to the next column address. Whenever the column address pointer finishes accessing the end column address, it is reset back to start column address and the row address is incremented to the next row.

Parameters:
  • column_start_address – Column start address, range : 0-127d, (RESET=0d)
  • column_end_address – Column end address, range : 0-127d, (RESET =127d)
Raises MethodError:
This command is only for horizontal or vertical addressing mode.

set_com_pins_configuration(configuration, remap)

Set COM Pins Hardware Configuration (DAh)

This command sets the COM signals pin configuration to match the OLED panel hardware layout. Refer to datasheet section 10.1.18 for detailed information.

Parameters:
  • configuration – 0 - Sequential COM pin configuration, 1 - Alternative COM pin configuration (RESET)
  • remap – 0 - Disable COM Left/Right remap (RESET) 1 - Enable COM Left/Right remap

set_contrast_control(contrast)

Set Contrast Control for BANK0 (81h)

This command sets the Contrast Setting of the display. The chip has 256 contrast steps from 00h to FFh. The segment output current increases as the contrast step value increases.

Parameters:
contrast – Double byte command to select 1 out of 256 contrast steps. Contrast increases as the value increases. (RESET = 7Fh )

set_deselect_level(level)

Set Vcomh deselect level (DBh)

This command adjust the Vcomh regulator output.

Parameters:
level – 0, 1 or 2 0 ~ 0.65 * Vcc 1 ~ 0.77 * Vcc (RESET) 2 ~ 0.83 * Vcc

set_display_clock(divider, osc_freq)

Set Display Clock Divide Ratio/Oscillator Frequency (D5h)

This command consists of two functions:

  • Display Clock Divide Ratio (D)(A[3:0])

Set the divide ratio to generate DCLK (Display Clock) from CLK. The divide ratio is from 1 to 16, with reset value = 1. Please refer to section 8.3 for the details relationship of DCLK and CLK.

  • Oscillator Frequency (A[7:4])

Program the oscillator frequency Fosc that is the source of CLK if CLS pin is pulled high. The 4-bit value results in 16 different frequency settings available as shown below. The default setting is 1000b.

Parameters:
  • divider – Define the divide ratio (D) of the display clocks (DCLK): Dvide ration = DIVIDER + 1, RESET is 0 (divide ratio = 1)
  • osc_freq – Set the Oscillator Frequncy, Fosc. Oscillator Frequency increases with the value of OSC_FREQ and vice versa. RESET is 1000b. Range: 0000b ~ 1111b.

set_display_offset(offset)

Set Display Offset (D3h)

This is a double byte command. The second command specifies the mapping of the display start line to one of COM0~COM63 (assuming that COM0 is the display start line then the display start line register is equal to 0). For example, to move the COM16 towards the COM0 direction by 16 lines the 6-bit data in the second byte should be given as 010000b. To move in the opposite direction by 16 lines the 6-bit data should be given by 64 – 16, so the second byte would be 100000b.

Parameters:
offset – Set vertical shift by COM from 0d~63d The value is reset to 00h after RESET.

set_display_on_off(on)

Set Display ON/OFF (AEh/AFh)

These single byte commands are used to turn the OLED panel display ON or OFF. When the display is ON, the selected circuits by Set Master Configuration command will be turned ON. When the display is OFF, those circuits will be turned OFF and the segment and common output are in VSS state and high impedance state, respectively.

Parameters:
on – True - Display ON False - Display OFF

set_display_start_line(start_line)

Set Display Start Line (40h~7Fh)

This command sets the Display Start Line register to determine starting address of display RAM, by selecting a value from 0 to 63. With value equal to 0, RAM row 0 is mapped to COM0. With value equal to 1, RAM row 1 is mapped to COM0 and so on.

Parameters:
start_line – Set display RAM display start line register from 0-63. Display start line register is reset to 000000b during RESET.

set_higher_column(column)

Set Higher Column Start Address for Page Addressing Mode (10h~1Fh)

This command specifies the higher nibble of the 8-bit column start address for the display data RAM under Page Addressing Mode. The column address will be incremented by each data access.

Parameters:
column – Set the higher nibble of the column start address register for Page Addressing Mode using X[3:0] as data bits. The initial display line register is reset to 0000b after RESET.
Raises MethodError:
This command is only for page addressing mode

set_inverse_display(inverse)

Set Normal/Inverse Display (A6h/A7h)

This command sets the display to be either normal or inverse. In normal display a RAM data of 1 indicates an “ON” pixel while in inverse display a RAM data of 0 indicates an “ON” pixel.

Parameters:
inverse – True - Inverse display False - ormal display (RESET)

set_lower_column(column)

Set Lower Column Start Address for Page Addressing Mode (00h~0Fh)

This command specifies the lower nibble of the 8-bit column start address for the display data RAM under Page Addressing Mode. The column address will be incremented by each data access.

Parameters:
column – Set the lower nibble of the column start address register for Page Addressing Mode using X[3:0] as data bits. The initial display line register is reset to 0000b after RESET.
Raises MethodError:
This command is only for page addressing mode

set_memory_addressing_mode(mode)

Set Memory Addressing Mode (20h)

There are 3 different memory addressing mode in SSD1306: page addressing mode, horizontal addressing mode and vertical addressing mode. This command sets the way of memory addressing into one of the above three modes. In there, “COL” means the graphic display data RAM column.

Parameters:

mode

2 - Page addressing mode In page addressing mode, after the display RAM is read/written, the column address pointer is increased automatically by 1. If the column address pointer reaches column end address, the column address pointer is reset to column start address and page address pointer is not changed. Users have to set the new page and column addresses in order to access the next page RAM content.

0 - Horizontal addressing mode In horizontal addressing mode, after the display RAM is read/written, the column address pointer is increased automatically by 1. If the column address pointer reaches column end address, the column address pointer is reset to column start address and page address pointer is increased by 1. When both column and page address pointers reach the end address, the pointers are reset to column start address and page start address.

1 - Vertical addressing mode In vertical addressing mode, after the display RAM is read/written, the page address pointer is increased automatically by 1. If the page address pointer reaches the page end address, the page address pointer is reset to page start address and column address pointer is increased by 1. When both column and page address pointers reach the end address, the pointers are reset to column start address and page start address

set_multiplex_ratio(ratio)

Set Multiplex Ratio (A8h)

This command switches the default 63 multiplex mode to any multiplex ratio, ranging from 16 to 63. The output pads COM0~COM63 will be switched to the corresponding COM signal.

Parameters:
ratio – Set MUX ratio to N+1 MUX N=A[5:0] : from 16MUX to 64MUX, RESET= 111111b (i.e. 63d, 64MUX) A[5:0] from 0 to 14 are invalid entry.

set_page_address(page_start_address, page_end_address)

Set Page Address (22h)

This triple byte command specifies page start address and end address of the display data RAM. This command also sets the page address pointer to page start address. This pointer is used to define the current read/write page address in graphic display data RAM. If vertical address increment mode is enabled by command 20h, after finishing read/write one page data, it is incremented automatically to the next page address. Whenever the page

address pointer finishes accessing the end page address, it is reset back to start page address.
Parameters:
  • page_start_address – Page start Address, range : 0-7d, (RESET = 0d)
  • page_end_address – Page end Address, range : 0-7d, (RESET = 7d)
Raises MethodError:
This command is only for horizontal or vertical addressing mode.

set_page_start_address(page)

Set Page Start Address for Page Addressing Mode (B0h~B7h)

This command positions the page start address from 0 to 7 in GDDRAM under Page Addressing Mode.

Parameters:
page – Set GDDRAM Page Start Address (PAGE0~PAGE7) for Page Addressing Mode using X[2:0].
Raises MethodError:
This command is only for page addressing mode

set_precharge_period(phase1, phase2)

Set Pre-charge Period (D9h)

This command is used to set the duration of the pre-charge period. The interval is counted in number of DCLK, where RESET equals 2 DCLKs.

Parameters:
  • phase1 – Phase 1 period of up to 15 DCLK clocks, 0 is invalid entry (RESET = 2h)
  • phase2 – Phase 2 period of up to 15 DCLK clocks, 0 is invalid entry (RESET = 2h)

set_scan_direction(remapped)

Set COM Output Scan Direction (C0h/C8h)

This command sets the scan direction of the COM output allowing layout flexibility in the OLED module design. Additionally, the display will show once this command is issued. For example, if this command is sent during normal display then the graphic display will be vertically flipped immediately.

Parameters:
remapped – True - remapped mode. Scan from COM[N-1] to COM0 False - normal mode. Scan from COM0 to COM[N –1] (RESET) Where N is the Multiplex ratio.

set_segment_remap(remap)

Set Segment Re-map (A0h/A1h)

This command changes the mapping between the display data column address and the segment driver. It allows flexibility in OLED module design. Please refer to Table 9-1.

This command only affects subsequent data input. Data already stored in GDDRAM will have no changes.

Parameters:
remap – True - column address 127 is mapped to SEG0 False - column address 0 is mapped to SEG0 (RESET)

set_vertical_scroll_area(start, count)

Set Vertical Scroll Area(A3h)

This command consists of 3 consecutive bytes to set up the vertical scroll area. For the continuous vertical scroll function (command 29/2Ah), the number of rows that in vertical scrolling can be set smaller or equal to the MUX ratio.

Parameters:
  • start – Set No. of rows in top fixed area. The No. of rows in top fixed area is referenced to the top of the GDDRAM (i.e. row 0).[RESET =0]
  • count – Set No. of rows in scroll area. This is the number of rows to be used for vertical scrolling. The scroll area starts in the first row below the top fixed area. [RESET = 64]

Raises ValueError:

update()

Send video buffer to the controller

vertical_and_horizontal_scroll_setup(direction, start_page, end_page, speed, vertical_offset)

Continuous Vertical and Horizontal Scroll Setup (29h/2Ah)

This command consists of 6 consecutive bytes to set up the continuous vertical scroll parameters and determines the scrolling start page, end page, scrolling speed and vertical scrolling offset.

The bytes B[2:0], C[2:0] and D[2:0] of command 29h/2Ah are for the setting of the continuous horizontal scrolling. The byte E[5:0] is for the setting of the continuous vertical scrolling offset. All these bytes together are for the setting of continuous diagonal (horizontal + vertical) scrolling. If the vertical scrolling offset byte E[5:0] is set to zero, then only horizontal scrolling is performed (like command 26/27h).

Before issuing this command the scroll must be deactivated (2Eh). Otherwise, RAM content may be corrupted.

Parameters:
  • direction – 0 - Vertical and Right Horizontal Scroll 1 - Vertical and Left Horizontal Scroll
  • start_page – Define start page address - PAGE0 ~ PAGE7
  • end_page – Define end page address - PAGE0 ~ PAGE7
  • speed – Set time interval between each roll step in terms of frame frequency: 0 - 5 frames 1 - 64 frames 2 - 128 frames 3 - 256 frames 4 - 3 frames 5 - 4 frames 6 - 25 frames 7 - 2 frames
  • vertical_offset – Vertical scrolling offset e.g. 01h refer to offset = 1 row 3Fh refer to offset = 63 rows
Raises ValueError:
Start page cannot be larger than end page

class class oled.Font(scale=1)

print_char(x, y, ch)

Print single char at location

Parameters:
  • x – X location
  • y – Y location
  • ch – ASCII code for char

print_string(x0, y0, string)

Print string to display.

Parameters:
  • x0 – Start X position
  • y0 – Start Y position
  • string – String to display

Returns: None

class class oled.Graphics

classmethod draw_circle(x0, y0, r)

Draw singled circle

Parameters:
  • x0 – Center x location
  • y0 – Center y location
  • r – Radius

classmethod draw_line(x0, y0, x1, y1)

Draw single line

Parameters:
  • x0 – Start x location
  • y0 – Start y location
  • x1 – End x location
  • y1 – End y location

classmethod draw_pixel(x, y, on=True)

Draw single pixel to video buffer

Parameters:
  • x – X location
  • y – Y location
  • on – True - Set pixel, False - clear pixel

0.0.4 (2015-03-21)

  • Fixed pypi archieve.

0.0.3 (2015-06-18)

  • Added detailed readme

0.0.1 (2015-06-17)

  • Initial release
Release History

Release History

0.0.4

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