117 lines
2.7 KiB
C++
117 lines
2.7 KiB
C++
|
/*
|
||
|
|
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
|
||
|
|
*
|
||
|
|
* This file is part of PortaPack.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
||
|
|
* any later version.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; see the file COPYING. If not, write to
|
||
|
|
* the Free Software Foundation, Inc., 51 Franklin Street,
|
||
|
|
* Boston, MA 02110-1301, USA.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "portapack_io.hpp"
|
||
|
|
|
||
|
|
#include "lpc43xx_cpp.hpp"
|
||
|
|
using namespace lpc43xx;
|
||
|
|
|
||
|
|
#include "utility.hpp"
|
||
|
|
|
||
|
|
#include <ch.h>
|
||
|
|
|
||
|
|
#include <cstdint>
|
||
|
|
|
||
|
|
namespace portapack {
|
||
|
|
|
||
|
|
void IO::init() {
|
||
|
|
data_mask_set();
|
||
|
|
data_write_high(0);
|
||
|
|
|
||
|
|
dir_read();
|
||
|
|
lcd_rd_deassert();
|
||
|
|
lcd_wr_deassert();
|
||
|
|
io_stb_deassert();
|
||
|
|
addr(0);
|
||
|
|
|
||
|
|
gpio_dir.output();
|
||
|
|
gpio_lcd_rdx.output();
|
||
|
|
gpio_lcd_wrx.output();
|
||
|
|
gpio_io_stbx.output();
|
||
|
|
gpio_addr.output();
|
||
|
|
gpio_rot_a.input();
|
||
|
|
gpio_rot_b.input();
|
||
|
|
}
|
||
|
|
|
||
|
|
void IO::lcd_backlight(const bool value) {
|
||
|
|
io_reg = (io_reg & 0x7f) | ((value ? 1 : 0) << 7);
|
||
|
|
io_write(1, io_reg);
|
||
|
|
}
|
||
|
|
|
||
|
|
void IO::lcd_reset_state(const bool active) {
|
||
|
|
io_reg = (io_reg & 0xfe) | ((active ? 1 : 0) << 0);
|
||
|
|
io_write(1, io_reg);
|
||
|
|
}
|
||
|
|
|
||
|
|
void IO::audio_reset_state(const bool active) {
|
||
|
|
/* NOTE: This overwrites the contents of the IO register, which for now
|
||
|
|
* have no significance. But someday...?
|
||
|
|
*/
|
||
|
|
io_reg = (io_reg & 0xfd) | ((active ? 1 : 0) << 1);
|
||
|
|
io_write(1, io_reg);
|
||
|
|
}
|
||
|
|
|
||
|
|
void IO::reference_oscillator(const bool enable) {
|
||
|
|
const uint8_t mask = 1 << 6;
|
||
|
|
io_reg = (io_reg & ~mask) | (enable ? mask : 0);
|
||
|
|
io_write(1, io_reg);
|
||
|
|
}
|
||
|
|
|
||
|
|
uint32_t IO::io_update(const TouchPinsConfig write_value) {
|
||
|
|
/* Very touchy code to save context of PortaPack data bus while the
|
||
|
|
* resistive touch pin drive is changed. Order of operations is
|
||
|
|
* important to prevent latching spurious data into the LCD or IO
|
||
|
|
* registers.
|
||
|
|
*/
|
||
|
|
|
||
|
|
const auto save_data = data_read();
|
||
|
|
const auto addr = gpio_addr.read();
|
||
|
|
const auto dir = gpio_dir.read();
|
||
|
|
|
||
|
|
io_stb_assert();
|
||
|
|
|
||
|
|
/* Switch to read */
|
||
|
|
dir_read();
|
||
|
|
addr_0();
|
||
|
|
__asm__("nop");
|
||
|
|
__asm__("nop");
|
||
|
|
__asm__("nop");
|
||
|
|
const auto switches_raw = data_read();
|
||
|
|
|
||
|
|
/* Switch to write */
|
||
|
|
data_write_low(toUType(write_value));
|
||
|
|
dir_write();
|
||
|
|
__asm__("nop");
|
||
|
|
__asm__("nop");
|
||
|
|
__asm__("nop");
|
||
|
|
io_stb_deassert();
|
||
|
|
|
||
|
|
data_write_low(save_data);
|
||
|
|
if( dir ) { /* 0 (write) -> 1 (read) */
|
||
|
|
dir_read();
|
||
|
|
}
|
||
|
|
gpio_addr.write(addr);
|
||
|
|
|
||
|
|
return switches_raw;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|