mirror of
https://github.com/eried/portapack-mayhem.git
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105 lines
2.4 KiB
C++
105 lines
2.4 KiB
C++
/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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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 2, or (at your option)
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* 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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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "portapack_io.hpp"
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#include "lpc43xx_cpp.hpp"
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using namespace lpc43xx;
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#include "utility.hpp"
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#include <ch.h>
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#include <cstdint>
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namespace portapack {
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void IO::init() {
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data_mask_set();
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data_write_high(0);
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dir_read();
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lcd_rd_deassert();
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lcd_wr_deassert();
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io_stb_deassert();
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addr(0);
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gpio_dir.output();
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gpio_lcd_rd.output();
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gpio_lcd_wr.output();
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gpio_io_stbx.output();
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gpio_addr.output();
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gpio_rot_a.input();
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gpio_rot_b.input();
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}
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void IO::lcd_backlight(const bool value) {
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io_reg = (io_reg & 0x7f) | ((value ? 1 : 0) << 7);
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io_write(1, io_reg);
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}
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void IO::lcd_reset_state(const bool active) {
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/* NOTE: This overwrites the contents of the IO register, which for now
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* have no significance. But someday...?
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*/
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io_reg = (io_reg & 0xfe) | ((active ? 1 : 0) << 0);
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io_write(1, io_reg);
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}
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uint32_t IO::io_update(const TouchPinsConfig write_value) {
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/* Very touchy code to save context of PortaPack data bus while the
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* resistive touch pin drive is changed. Order of operations is
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* important to prevent latching spurious data into the LCD or IO
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* registers.
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*/
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const auto save_data = data_read();
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const auto addr = gpio_addr.read();
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const auto dir = gpio_dir.read();
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io_stb_assert();
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/* Switch to read */
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dir_read();
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addr_0();
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__asm__("nop");
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__asm__("nop");
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__asm__("nop");
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const auto switches_raw = data_read();
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/* Switch to write */
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data_write_low(toUType(write_value));
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dir_write();
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__asm__("nop");
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__asm__("nop");
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__asm__("nop");
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io_stb_deassert();
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data_write_low(save_data);
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if( dir ) { /* 0 (write) -> 1 (read) */
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dir_read();
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}
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gpio_addr.write(addr);
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return switches_raw;
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}
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}
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