In previous post, we have seen in detail about MAX7219 & its registers and how to configure it. Now here we present an example of using MAX7219 with 7 segment LED interfacing with AVR ATmega family microcontroller.
LIST OF FUNCTIONS IN FOR MAX7219
Shuts down or normals the Display (DON/DOFF) MX7219_shutdown(sd) Test the display or normal operation (NORM/TEST) MX7219_display_test(dt)
Sets the Digit Brightness value (0x01 to 0x0F) MX7219_set_brightness(brightness)
Set scan limit MX7219_set_scanupto(digit)
Decode settings MX7219_set_decode(de)
de -> NONE=0x00, D0=0x01, D0-D3=0x0F, D0-D7=0xFF
DECODE NONE MX7219_set_decode_NONE()
Clear all 8 segments MX7219_clear_disp()
Blanks all 8 segments MX7219_blank_bcd_disp()
Display a BCD digit MX7219_dispbcd(pos,dat)
Display a Matrix MX7219_disp_matrix(mat,size,st)
Initialize 7219 MAX7219_init()
Here is the circuit diagram interfacing AVR ATmega8 with MAX7219 to 7 Seg LED
The Proteus simulation output for the project is shown below,
Click here to download the AVR Project file with C code & MAX7219 Header file.
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