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79 lines
1.8 KiB
79 lines
1.8 KiB
7 years ago
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/*
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* This file is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#pragma once
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#include <AP_OSD/AP_OSD_Backend.h>
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class AP_OSD_MAX7456 : public AP_OSD_Backend {
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public:
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static AP_OSD_Backend *probe(AP_OSD &osd, AP_HAL::OwnPtr<AP_HAL::Device> dev);
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//draw given text to framebuffer
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virtual void write(int x, int y, const char* text, uint8_t char_attr);
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//initilize display port and underlying hardware
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virtual bool init();
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//flush framebuffer to screen
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virtual void flush();
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//clear framebuffer
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virtual void clear();
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private:
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//constructor
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AP_OSD_MAX7456(AP_OSD &osd, AP_HAL::OwnPtr<AP_HAL::Device> dev);
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//destructor
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virtual ~AP_OSD_MAX7456(void);
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void buffer_add_cmd(uint8_t reg, uint8_t arg);
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bool update_font();
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void check_reinit();
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void reinit();
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void transfer_frame();
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AP_HAL::OwnPtr<AP_HAL::Device> _dev;
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uint8_t video_signal_reg;
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bool initialized;
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uint8_t *frame;
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//frame already transfered to max
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//used to optimize number of characters updated
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uint8_t *shadow_frame;
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uint8_t *attr;
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uint8_t *shadow_attr;
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uint8_t *buffer;
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int buffer_offset;
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uint32_t last_signal_check;
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uint32_t video_detect_time;
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uint16_t max_screen_size;
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};
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