portapack-mayhem/firmware/common/portapack_io.hpp

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