void led_max7219_on(uint8_t display)
switch display on
void led_max7219_setup(uint8_t displays)
setup communication with MAX7219 IC
bool led_max7219_text(char *text, uint8_t display)
display text
void led_max7219_test(bool test, uint8_t display)
switch display in test or normal operation mode
void led_max7219_off(uint8_t display)
switch display off
void led_max7219_number(uint32_t number, uint8_t dots, uint8_t display)
display number
void led_max7219_intensity(uint8_t intensity, uint8_t digits, uint8_t display)
set display intensity
void led_max7219_nop(uint8_t display)
do nothing (no operation)