71 lines
2.6 KiB
C++
71 lines
2.6 KiB
C++
/**************
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* dl_cache.h *
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**************/
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/****************************************************************************
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* Written By Marcio Teixeira 2018 - Aleph Objects, Inc. *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the 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 program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* To view a copy of the GNU General Public License, go to the following *
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* location: <https://www.gnu.org/licenses/>. *
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****************************************************************************/
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#pragma once
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/******************* DISPLAY LIST CACHE MANAGEMENT ************************/
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/* The Display List Cache mechanism stores the display list corresponding
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* to a menu into RAM_G so that on subsequent calls drawing the menu does
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* not require as much SPI traffic. Dynamic content, such as indicators,
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* should not be cached.
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*
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* The DLCache can be used like so:
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*
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* DLCache dlcache(UNIQUE_ID);
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*
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* if (dlcache.hasData())
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* dlcache.append();
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* else
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* dlcache.store(); // Add stuff to the DL
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*/
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class DLCache {
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private:
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typedef FTDI::ftdi_registers REG;
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typedef FTDI::ftdi_memory_map MAP;
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uint8_t dl_slot_indx;
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uint32_t dl_slot_addr;
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uint16_t dl_slot_size;
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uint16_t dl_slot_used;
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void load_slot() {load_slot(dl_slot_indx, dl_slot_addr, dl_slot_size, dl_slot_used);}
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void save_slot() {save_slot(dl_slot_indx, dl_slot_addr, dl_slot_size, dl_slot_used);}
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static void load_slot(uint8_t indx, uint32_t &addr, uint16_t &size, uint16_t &used);
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static void save_slot(uint8_t indx, uint32_t addr, uint16_t size, uint16_t used);
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bool wait_until_idle();
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public:
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static void init();
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DLCache(uint8_t slot) {
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dl_slot_indx = slot;
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load_slot();
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}
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bool has_data();
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bool store(uint32_t min_bytes = 0);
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void append();
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};
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#define DL_CACHE_SLOTS 250
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