max7219_n
Library to support cascaded 8x8 led matrices with MAX7219s
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Author
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Rob Hamerling, Copyright © 2014..2014, all rights reserved.
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Adapted-by
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Compiler
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2.4q2
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Description
See the description of max7219.jal.
Notes
- This library is designed for max7219 modules controlling an 8x8 LED matrix,
the features of the MAX7219 chips for 7-segment displays are disabled.
- The terms 'row' and 'column' are ambiguous: depending on the orientation
of the module! This library calls the LEDs which can be written with a
single write operation a column. Writing a row of a single module requires
8 writes and the cache being active.
See the procedures max7219_display_col() and max7219_display_row().
Dependencies
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max7219_display_blink(byte in times, byte in halfperiod)
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max7219_init()
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max7219_display_byte_bin(byte in num, byte in col, byte in data)
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max7219_display_row(byte in num, byte in row, bit in state)
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max7219_display_test(byte in period)
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max7219_display_col(byte in num, byte in col, bit in state)
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max7219_display_bit(byte in num, byte in col, byte in row, bit in state)
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max7219_display_clear()
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max7219_display_intensity(byte in intensity)
Private
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max7219_display_blink(byte in times, byte in halfperiod)
Title: Blink whole module a number of times at a given speed
Input: - number of times the display should blink off and on (byte)
time in 0.1 seconds of the on and off periods (duty cycle is 50%)
Notes: All 'on' LEDs of all modules will blink simultaneously.
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max7219_init()
Title: Initialize all modules with max7219
Input: (none)
Notes: Must be called before any other operation involving the display
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max7219_display_byte_bin(byte in num, byte in col, byte in data)
Title: Display a column (byte, 8 bits) of one module
Input: - module number (byte, 0..7)
column number (byte, 0..7)
with bit pattern to be displayed (byte)
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max7219_display_row(byte in num, byte in row, bit in state)
Title: Display a row of leds (all leds in a row on or off) in one module
Input: - module number (byte, 0..7)
row number (byte, 0..7)
led state (bit, true or false, resp. on or off)
Notes: - Writes 8 columns of 1 module.
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max7219_display_test(byte in period)
Title: Put all MAX7219 modules in test mode for some time.
Input: test period (byte, number of 0.1 seconds)
Notes: All leds will be in maximum intensity during the specified period
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max7219_display_col(byte in num, byte in col, bit in state)
Title: Display a column of leds (all leds in a column on or off)
Input: - module number (byte, 0..7)
column number (byte, 0..7)
led state (true or false, resp. on or off)
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max7219_display_bit(byte in num, byte in col, byte in row, bit in state)
Title: Set or reset a single LED
Input: - module number (byte, 0..7)
column number (byte, 0..7)
row number (byte, 0..7)
led state (bit, true or false, on or off)
Notes: - Writes 1 column of one module
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max7219_display_clear()
Title: Clear display (all LEDs off)
Input: (none)
Notes: All LEDs of all modules will be cleared
(write 8 times the same column of every module))
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max7219_display_intensity(byte in intensity)
Title: Set LED intensity
Input: LED intensity (range 0..15)
Notes: All LEDs of all modules will have the same luminosity
Private
Here are the list of samples which use this library: