max7219.h

/*
 * Copyright (c) 2019 Ruslan V. Uss <unclerus@gmail.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holder nor the names of itscontributors
 *    may be used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @file max7219.h
 * @defgroup max7219 max7219
 * @{
 *
 * ESP-IDF driver for MAX7219/MAX7221
 * Serially Interfaced, 8-Digit LED Display Drivers
 *
 * Ported from esp-open-rtos
 *
 * Copyright (c) 2017 Ruslan V. Uss <unclerus@gmail.com>
 *
 * BSD Licensed as described in the file LICENSE
 */
#ifndef __MAX7219_H__
#define __MAX7219_H__

#include <stdint.h>
#include <stdbool.h>
#include <driver/spi_master.h>
#include <driver/gpio.h> // add by nopnop2002
#include <esp_err.h>

#ifdef __cplusplus
extern "C" {
#endif

#define MAX7219_MAX_CLOCK_SPEED_HZ (10000000) // 10 MHz
#define MAX7219_MAX_BRIGHTNESS   15

/**
 * Display descriptor
 */
typedef struct
{
    spi_device_interface_config_t spi_cfg;
    spi_device_handle_t spi_dev;
    uint8_t digits;              //!< Accessible digits in 7seg. Up to cascade_size * 8
    uint8_t cascade_size;        //!< Number of cascaded MAX72xx devices
    bool mirrored;               //!< true for horizontally mirrored displays
    bool bcd;
} max7219_t;

/**
 * @brief Initialize device descriptor
 *
 * @param dev Device descriptor
 * @param host SPI host
 * @param clock_speed_hz SPI clock speed, Hz
 * @param cs_pin CS GPIO number
 * @return `ESP_OK` on success
 */
esp_err_t max7219_init_desc(max7219_t *dev, spi_host_device_t host, uint32_t clock_speed_hz, gpio_num_t cs_pin);

/**
 * @brief Free device descriptor
 *
 * @param dev Device descriptor
 * @return `ESP_OK` on success
 */
esp_err_t max7219_free_desc(max7219_t *dev);

/**
 * @brief Initialize display
 *
 * Switch it to normal operation from shutdown mode,
 * set scan limit to the max and clear
 *
 * @param dev Display descriptor
 * @return `ESP_OK` on success
 */
esp_err_t max7219_init(max7219_t *dev);

/**
 * @brief Set decode mode and clear display
 *
 * @param dev Display descriptor
 * @param bcd true to set BCD decode mode, false to normal
 * @return `ESP_OK` on success
 */
esp_err_t max7219_set_decode_mode(max7219_t *dev, bool bcd);

/**
 * @brief Set display brightness
 *
 * @param dev Display descriptor
 * @param value Brightness value, 0..MAX7219_MAX_BRIGHTNESS
 * @return `ESP_OK` on success
 */
esp_err_t max7219_set_brightness(max7219_t *dev, uint8_t value);

/**
 * @brief Set brightness of specific chip in cascade
 *
 * @param dev Display descriptor
 * @param chip Chip index, 0..dev->cascade_size - 1
 * @param value Brightness value, 0..MAX7219_MAX_BRIGHTNESS
 * @return `ESP_OK` on success
 */
esp_err_t max7219_set_brightness_chip(max7219_t *dev, uint8_t chip, uint8_t value);

/**
 * @brief Shutdown display or set it to normal mode
 *
 * @param dev Display descriptor
 * @param shutdown Shutdown display if true
 * @return `ESP_OK` on success
 */
esp_err_t max7219_set_shutdown_mode(max7219_t *dev, bool shutdown);

/**
 * @brief Write data to display digit
 *
 * @param dev Display descriptor
 * @param digit Digit index, 0..dev->digits - 1
 * @param val Data
 * @return `ESP_OK` on success
 */
esp_err_t max7219_set_digit(max7219_t *dev, uint8_t digit, uint8_t val);

/**
 * @brief Clear display
 *
 * @param dev Display descriptor
 * @return `ESP_OK` on success
 */
esp_err_t max7219_clear(max7219_t *dev);

/**
 * @brief Draw text on 7-segment display
 *
 * @param dev Display descriptor
 * @param pos Start digit
 * @param s Text
 * @return `ESP_OK` on success
 */
esp_err_t max7219_draw_text_7seg(max7219_t *dev, uint8_t pos, const char *s);

/**
 * @brief Draw 64-bit image on 8x8 matrix
 *
 * @param dev Display descriptor
 * @param pos Start digit
 * @param image 64-bit buffer with image data
 * @return `ESP_OK` on success
 */
esp_err_t max7219_draw_image_8x8(max7219_t *dev, uint8_t pos, const void *image);

#ifdef __cplusplus
}
#endif

/**@}*/

#endif /* __MAX7219_H__ */