383 lines
8.6 KiB
C++
383 lines
8.6 KiB
C++
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/*
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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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#ifndef __PORTAPACK_IO_H__
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#define __PORTAPACK_IO_H__
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#include <cstdint>
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#include <cstddef>
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#include <array>
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#include "gpio.hpp"
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#include "ui.hpp"
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namespace portapack {
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class IO {
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public:
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enum class TouchPinsConfig : uint8_t {
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XN_BIT = (1 << 0),
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XP_BIT = (1 << 1),
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YN_BIT = (1 << 2),
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YP_BIT = (1 << 3),
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XN_OE = (1 << 4),
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XP_OE = (1 << 5),
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YN_OE = (1 << 6),
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YP_OE = (1 << 7),
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XN_IN = XN_BIT,
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XN_OUT_1 = XN_OE | XN_BIT,
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XN_OUT_0 = XN_OE,
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XP_IN = XP_BIT,
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XP_OUT_1 = XP_OE | XP_BIT,
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XP_OUT_0 = XP_OE,
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YN_IN = YN_BIT,
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YN_OUT_1 = YN_OE | YN_BIT,
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YN_OUT_0 = YN_OE,
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YP_IN = YP_BIT,
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YP_OUT_1 = YP_OE | YP_BIT,
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YP_OUT_0 = YP_OE,
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/* Allow pins to be pulled up by CPLD pull-ups. */
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Float = XP_IN | XN_IN | YP_IN | YN_IN,
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/* Drive one plane to 0V, other plane is pulled up. Watch for when pulled-up
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* plane falls to ~0V.
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*/
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WaitTouch = XP_OUT_0 | XN_OUT_0 | YP_IN | YN_IN,
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/* Create a voltage divider between X plane, touch resistance, Y plane. */
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SensePressure = XP_IN | XN_OUT_0 | YP_OUT_1 | YN_IN,
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/* Create a voltage divider across X plane, read voltage from Y plane. */
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SenseX = XP_OUT_1 | XN_OUT_0 | YP_IN | YN_IN,
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/* Create a voltage divider across Y plane, read voltage from X plane. */
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SenseY = XP_IN | XN_IN | YP_OUT_1 | YN_OUT_0,
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};
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constexpr IO(
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GPIO gpio_dir,
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GPIO gpio_lcd_rdx,
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GPIO gpio_lcd_wrx,
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GPIO gpio_io_stbx,
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GPIO gpio_addr,
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GPIO gpio_rot_a,
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GPIO gpio_rot_b
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) : gpio_dir { gpio_dir },
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gpio_lcd_rdx { gpio_lcd_rdx },
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gpio_lcd_wrx { gpio_lcd_wrx },
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gpio_io_stbx { gpio_io_stbx },
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gpio_addr { gpio_addr },
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gpio_rot_a { gpio_rot_a },
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gpio_rot_b { gpio_rot_b }
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{
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};
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void init();
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void lcd_backlight(const bool value);
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void lcd_reset_state(const bool active);
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void audio_reset_state(const bool active);
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void reference_oscillator(const bool enable);
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void lcd_data_write_command_and_data(
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const uint_fast8_t command,
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const uint8_t* data,
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const size_t data_count
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) {
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lcd_command(command);
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for(size_t i=0; i<data_count; i++) {
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lcd_write_data(data[i]);
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}
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}
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void lcd_data_write_command_and_data(
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const uint_fast8_t command,
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const std::initializer_list<uint8_t>& data
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) {
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lcd_command(command);
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for(const auto d : data) {
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lcd_write_data(d);
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}
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}
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void lcd_data_read_command_and_data(
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const uint_fast8_t command,
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uint16_t* const data,
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const size_t data_count
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) {
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lcd_command(command);
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for(size_t i=0; i<data_count; i++) {
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data[i] = lcd_read_data();
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}
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}
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void lcd_write_word(const uint32_t w) {
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lcd_write_data(w);
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}
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void lcd_write_words(const uint16_t* const w, size_t n) {
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for(size_t i=0; i<n; i++) {
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lcd_write_data(w[i]);
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}
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}
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void lcd_write_pixel(const ui::Color pixel) {
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lcd_write_data(pixel.v);
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}
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uint32_t lcd_read_word() {
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return lcd_read_data();
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}
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void lcd_write_pixels(const ui::Color pixel, size_t n) {
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while(n--) {
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lcd_write_data(pixel.v);
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}
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}
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void lcd_write_pixels_unrolled8(const ui::Color pixel, size_t n) {
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auto v = pixel.v;
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n >>= 3;
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while(n--) {
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lcd_write_data(v);
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lcd_write_data(v);
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lcd_write_data(v);
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lcd_write_data(v);
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lcd_write_data(v);
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lcd_write_data(v);
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lcd_write_data(v);
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lcd_write_data(v);
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}
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}
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void lcd_write_pixels(const ui::Color* const pixels, size_t n) {
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for(size_t i=0; i<n; i++) {
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lcd_write_pixel(pixels[i]);
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}
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}
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void lcd_read_bytes(uint8_t* byte, size_t byte_count) {
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size_t word_count = byte_count / 2;
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while(word_count) {
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const auto word = lcd_read_data();
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*(byte++) = word >> 8;
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*(byte++) = word >> 0;
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word_count--;
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}
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if( byte_count & 1 ) {
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const auto word = lcd_read_data();
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*(byte++) = word >> 8;
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}
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}
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uint32_t io_read() {
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io_stb_assert();
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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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io_stb_deassert();
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return switches_raw;
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}
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uint32_t io_update(const TouchPinsConfig write_value);
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uint32_t lcd_te() {
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return gpio_rot_a.read();
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}
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private:
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const GPIO gpio_dir;
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const GPIO gpio_lcd_rdx;
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const GPIO gpio_lcd_wrx;
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const GPIO gpio_io_stbx;
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const GPIO gpio_addr;
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const GPIO gpio_rot_a;
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const GPIO gpio_rot_b;
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static constexpr ioportid_t gpio_data_port_id = 3;
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static constexpr size_t gpio_data_shift = 8;
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static constexpr ioportmask_t gpio_data_mask = 0xffU << gpio_data_shift;
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uint8_t io_reg { 0x03 };
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void lcd_rd_assert() {
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gpio_lcd_rdx.clear();
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}
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void lcd_rd_deassert() {
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gpio_lcd_rdx.set();
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}
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void lcd_wr_assert() {
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gpio_lcd_wrx.clear();
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}
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void lcd_wr_deassert() {
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gpio_lcd_wrx.set();
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}
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void io_stb_assert() {
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gpio_io_stbx.clear();
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}
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void io_stb_deassert() {
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gpio_io_stbx.set();
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}
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void addr(const bool value) {
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gpio_addr.write(value);
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}
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void addr_1() {
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gpio_addr.set();
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}
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void addr_0() {
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gpio_addr.clear();
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}
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void data_mask_set() {
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LPC_GPIO->MASK[gpio_data_port_id] = ~gpio_data_mask;
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}
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void dir_write() {
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gpio_dir.clear();
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LPC_GPIO->DIR[gpio_data_port_id] |= gpio_data_mask;
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/* TODO: Manipulating DIR[3] makes me queasy. The RFFC5072 DATA pin
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* is also on port 3, and switches direction periodically...
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* Time to resort to bit-banding to enforce atomicity? But then, how
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* to change direction on eight bits efficiently? Or do I care, since
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* the PortaPack data bus shouldn't change direction too frequently?
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*/
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}
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void dir_read() {
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LPC_GPIO->DIR[gpio_data_port_id] &= ~gpio_data_mask;
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gpio_dir.set();
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}
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void data_write_low(const uint32_t value) {
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LPC_GPIO->MPIN[gpio_data_port_id] = (value << gpio_data_shift);
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}
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void data_write_high(const uint32_t value) {
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LPC_GPIO->MPIN[gpio_data_port_id] = value;
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}
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uint32_t data_read() {
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return (LPC_GPIO->MPIN[gpio_data_port_id] >> gpio_data_shift) & 0xffU;
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}
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void lcd_command(const uint32_t value) {
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data_write_high(0); /* Drive high byte (with zero -- don't care) */
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dir_write(); /* Turn around data bus, MCU->CPLD */
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addr(0); /* Indicate command */
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__asm__("nop");
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__asm__("nop");
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__asm__("nop");
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lcd_wr_assert(); /* Latch high byte */
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data_write_low(value); /* Drive low byte (pass-through) */
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__asm__("nop");
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__asm__("nop");
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__asm__("nop");
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lcd_wr_deassert(); /* Complete write operation */
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addr(1); /* Set up for data phase (most likely after a command) */
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}
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void lcd_write_data(const uint32_t value) __attribute__((always_inline)) {
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// NOTE: Assumes and DIR=0 and ADDR=1 from command phase.
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data_write_high(value); /* Drive high byte */
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__asm__("nop");
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lcd_wr_assert(); /* Latch high byte */
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data_write_low(value); /* Drive low byte (pass-through) */
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__asm__("nop");
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__asm__("nop");
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__asm__("nop");
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lcd_wr_deassert(); /* Complete write operation */
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}
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uint32_t lcd_read_data() {
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// NOTE: Assumes ADDR=1 from command phase.
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dir_read();
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/* Start read operation */
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lcd_rd_assert();
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/* Wait for passthrough data(15:8) to settle -- ~16ns (3 cycles) typical */
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/* Wait for read control L duration (355ns) */
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halPolledDelay(71); // 355ns
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const auto value_high = data_read();
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/* Latch data[7:0] */
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lcd_rd_deassert();
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/* Wait for latched data[7:0] to settle -- ~26ns (5 cycles) typical */
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/* Wait for read control H duration (90ns) */
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halPolledDelay(18); // 90ns
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const auto value_low = data_read();
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return (value_high << 8) | value_low;
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}
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void io_write(const bool address, const uint_fast16_t value) {
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data_write_low(value);
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dir_write();
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addr(address);
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__asm__("nop");
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__asm__("nop");
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__asm__("nop");
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io_stb_assert();
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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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}
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/*
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void lcd_data_write_command_and_data(
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const uint_fast16_t command,
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const uint8_t* const data,
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const size_t count
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) {
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lcd_data_write_command(command);
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for(size_t i=0; i<count; i++) {
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lcd_data_write_data(data[i]);
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}
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}
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*/
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};
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extern IO io;
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} /* namespace portapack */
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#endif/*__PORTAPACK_IO_H__*/
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