File content as of revision 3:1371614703cd:

// Copyright 2013 Pervasive Displays, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
// express or implied.  See the License for the specific language
// governing permissions and limitations under the License.

#ifndef EPD_H
#define EPD_H

#include "mbed.h"

#define PROGMEM


typedef enum {
    EPD_1_44,        // 128 x 96
    EPD_2_0,         // 200 x 96
    EPD_2_7          // 264 x 176
} EPD_size;

typedef enum {           // Image pixel -> Display pixel
    EPD_compensate,  // B -> W, W -> B (Current Image)
    EPD_white,       // B -> N, W -> W (Current Image)
    EPD_inverse,     // B -> N, W -> B (New Image)
    EPD_normal       // B -> B, W -> W (New Image)
} EPD_stage;

typedef void EPD_reader(void *buffer, uint32_t address, uint16_t length);

class EPD_Class {
private:
    DigitalOut EPD_Pin_PANEL_ON;
    DigitalOut EPD_Pin_BORDER;
    DigitalOut EPD_Pin_DISCHARGE;
    PwmOut EPD_Pin_PWM;
    DigitalOut EPD_Pin_RESET;
    DigitalIn EPD_Pin_BUSY;
    DigitalOut EPD_Pin_EPD_CS;
    SPI spi_;    

    EPD_size size;
    uint16_t stage_time;
    uint16_t factored_stage_time;
    uint16_t lines_per_display;
    uint16_t dots_per_line;
    uint16_t bytes_per_line;
    uint16_t bytes_per_scan;
    PROGMEM const uint8_t *gate_source;
    uint16_t gate_source_length;
    PROGMEM const uint8_t *channel_select;
    uint16_t channel_select_length;

    bool filler;
    
    void SPI_put(uint8_t c);
    void SPI_put_wait(uint8_t c, DigitalIn busy_pin);
    void SPI_send(DigitalOut cs_pin, const uint8_t *buffer, uint16_t length);

public:
    // power up and power down the EPD panel
    void begin();
    void end();

    void setFactor(int temperature = 25) {
        this->factored_stage_time = this->stage_time * this->temperature_to_factor_10x(temperature) / 10;
    }

    // clear display (anything -> white)
    void clear() {
        this->frame_fixed_repeat(0xff, EPD_compensate);
        this->frame_fixed_repeat(0xff, EPD_white);
        this->frame_fixed_repeat(0xaa, EPD_inverse);
        this->frame_fixed_repeat(0xaa, EPD_normal);
    }

    // assuming a clear (white) screen output an image (PROGMEM data)
    void image(const uint8_t *image) {
        this->frame_fixed_repeat(0xaa, EPD_compensate);
        this->frame_fixed_repeat(0xaa, EPD_white);
        this->frame_data_repeat(image, EPD_inverse);
        this->frame_data_repeat(image, EPD_normal);
    }

    // change from old image to new image (PROGMEM data)
    void image(const uint8_t *old_image, const uint8_t *new_image) {
        this->frame_data_repeat(old_image, EPD_compensate);
        this->frame_data_repeat(old_image, EPD_white);
        this->frame_data_repeat(new_image, EPD_inverse);
        this->frame_data_repeat(new_image, EPD_normal);
    }

#if defined(EPD_ENABLE_EXTRA_SRAM)

    // change from old image to new image (SRAM version)
    void image_sram(const uint8_t *old_image, const uint8_t *new_image) {
        this->frame_sram_repeat(old_image, EPD_compensate);
        this->frame_sram_repeat(old_image, EPD_white);
        this->frame_sram_repeat(new_image, EPD_inverse);
        this->frame_sram_repeat(new_image, EPD_normal);
    }
#endif

    // Low level API calls
    // ===================

    // single frame refresh
    void frame_fixed(uint8_t fixed_value, EPD_stage stage);
    void frame_data(const uint8_t *new_image, EPD_stage stage);
#if defined(EPD_ENABLE_EXTRA_SRAM)
    void frame_sram(const uint8_t *new_image, EPD_stage stage);
#endif
    void frame_cb(uint32_t address, EPD_reader *reader, EPD_stage stage);

    // stage_time frame refresh
    void frame_fixed_repeat(uint8_t fixed_value, EPD_stage stage);
    void frame_data_repeat(const uint8_t *new_image, EPD_stage stage);
#if defined(EPD_ENABLE_EXTRA_SRAM)
    void frame_sram_repeat(const uint8_t *new_image, EPD_stage stage);
#endif
    void frame_cb_repeat(uint32_t address, EPD_reader *reader, EPD_stage stage);

    // convert temperature to compensation factor
    int temperature_to_factor_10x(int temperature);

    // single line display - very low-level
    // also has to handle AVR progmem
    void line(uint16_t line, const uint8_t *data, uint8_t fixed_value, bool read_progmem, EPD_stage stage);

    // inline static void attachInterrupt();
    // inline static void detachInterrupt();

    EPD_Class(EPD_size size,
          PinName panel_on_pin,
          PinName border_pin,
          PinName discharge_pin,
          PinName pwm_pin,
          PinName reset_pin,
          PinName busy_pin,
          PinName chip_select_pin,
          PinName mosi,
          PinName miso,
          PinName sck);

};

#endif