96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
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/*
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* Driver for MAX7219/MAX7221
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* Serially Interfaced, 8-Digit LED Display Drivers
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*
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* Part of esp-open-rtos
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* Copyright (C) 2017 Ruslan V. Uss <unclerus@gmail.com>
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* BSD Licensed as described in the file LICENSE
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*/
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#ifndef EXTRAS_MAX7219_H_
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#define EXTRAS_MAX7219_H_
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#include <stdint.h>
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#define MAX7219_MAX_CASCADE_SIZE 8
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#define MAX7219_MAX_BRIGHTNESS 31
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/**
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* Display descriptor
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*/
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typedef struct
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{
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uint8_t cs_pin; //!< GPIO connected to CS/LOAD pin
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uint8_t digits; //!< Accessible digits in 7seg. Up to cascade_size * 8
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uint8_t cascade_size; //!< Up to 8 MAX721xx cascaded
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bool mirrored; //!< true for horizontally mirrored displays
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bool bcd;
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} max7219_display_t;
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/**
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* Initialize display: switch it to normal operation from shutdown mode,
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* set scan limit to the max and clear
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* @param disp Pointer to display descriptor
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* @return false if error occured
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*/
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bool max7219_init(max7219_display_t *disp);
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/**
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* Set decode mode and clear display
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* @param disp Pointer to display descriptor
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* @param bcd true to set BCD decode mode, false to normal
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*/
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void max7219_set_decode_mode(max7219_display_t *disp, bool bcd);
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/**
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* Set display brightness
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* @param disp Pointer to display descriptor
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* @param value Brightness value, 0..MAX7219_MAX_BRIGHTNESS
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*/
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void max7219_set_brightness(const max7219_display_t *disp, uint8_t value);
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/**
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* Shutdown display or set it to normal mode
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* @param disp Pointer to display descriptor
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* @param shutdown Shutdown display if true
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*/
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void max7219_set_shutdown_mode(const max7219_display_t *disp, bool shutdown);
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/**
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* Write data to display digit
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* @param disp Pointer to display descriptor
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* @param digit Digit index, 0..disp->digits - 1
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* @param val Data
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* @return false if error occured
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*/
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bool max7219_set_digit(const max7219_display_t *disp, uint8_t digit, uint8_t val);
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/**
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* Clear display
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* @param disp Pointer to display descriptor
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*/
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void max7219_clear(const max7219_display_t *disp);
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/**
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* Draw text.
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* Currently only 7-segment displays supported
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* @param disp Pointer to display descriptor
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* @param pos Start digit
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* @param s Text
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*/
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void max7219_draw_text(const max7219_display_t *disp, uint8_t pos, const char *s);
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#ifdef __cplusplus
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}
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#endif
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#endif /* EXTRAS_MAX7219_H_ */
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