MAX7219 Module¶

This Module exposes all functionalities of Maxim MAX7219 Led Display driver ([datasheet(https://datasheets.maximintegrated.com/en/ds/MAX7219-MAX7221.pdf)).

class MAX7219¶

class MAX7219(spidrv,cs,clk=1000000)

Creates an intance of a new MAX7219.

Arguments:

spidrv – SPI Bus used ‘( SPI0, … )’
cs – Chip Select
clk – Clock speed, default 100kHz

Example:

from maxim.max7219 import max7219

...

display = max7219.MAX7219(SPI0, D17)
display.set_led(row, col, 1) # set to on the led in 0x0 position

MAX7219.shutdown¶

shutdown(powerdown)

Function to shutdown the display attached

Arguments:

powerdown – Boolean True or False

MAX7219.set_scan_limit¶

set_scan_limit(limit) *only for 7-segments Display*

Method that is used for seven segment displays that limits the number of digits.

Arguments:

limit – number of banks (values 0 to 7).

MAX7219.set_intensity¶

set_intensity(intensity)

Sets the intensity of the LEDs output.

Arguments:

intensity – light output intensity (values 0 to 15).

MAX7219.clear_display¶

clear_display()

Clears the display by setting all LEDs to 0.

MAX7219.set_led¶

set_led(row,column,state)

Allows the control of a single LED.

Arguments:

row – is the row (values 0 to 7)
column – is the column (values 0 to 7)
state – is True for Led ON, and False for Led OFF

MAX7219.set_row¶

set_row(row,state)

Sets an entire row.

Arguments:

row – row to control (values from 0 to 7)
state – is True for Led ON, and False for Led OFF

MAX7219.set_column¶

set_column(col, state)

Sets an entire column.

Arguments:

column – column to control (values from 0 to 7)
state – is True for Led ON, and False for Led OFF

MAX7219.set_digit¶

set_digit(digit,value,dp) *only for 7-segments Display*

Used with 7 segment displays to set a digit to display on the 7 segments.

Arguments:

digit – is the bank from 0 to 7 to display
value – is the number value
dp – is the decimal point

MAX7219.set_char¶

set_char(dev_num,digit,value,state) *only for 7-segments Display*

Arguments:

digit – is the bank from 0 to 7 to display
value – is the character value
state – is True for Led ON, and False for Led OFF