1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
#![no_std]
#![no_main]
#![feature(asm)]
#![feature(type_alias_impl_trait)]
#![allow(incomplete_features)]
#[path = "../example_common.rs"]
mod example_common;
use core::cell::RefCell;
use core::fmt::Debug;
use defmt::*;
use display_interface_spi::SPIInterfaceNoCS;
use embassy::executor::Spawner;
use embassy::time::Delay;
use embassy_rp::gpio::NoPin;
use embassy_rp::peripherals;
use embassy_rp::spi;
use embassy_rp::spi::Spi;
use embassy_rp::{gpio, Peripherals};
use embedded_graphics::image::{Image, ImageRawLE};
use embedded_graphics::mono_font::ascii::FONT_10X20;
use embedded_graphics::mono_font::MonoTextStyle;
use embedded_graphics::pixelcolor::Rgb565;
use embedded_graphics::prelude::*;
use embedded_graphics::primitives::{PrimitiveStyleBuilder, Rectangle};
use embedded_graphics::text::Text;
use gpio::{Level, Output};
use st7789::{Orientation, ST7789};
#[embassy::main]
async fn main(_spawner: Spawner, p: Peripherals) {
info!("Hello World!");
let bl = p.PIN_13;
let rst = p.PIN_15;
let display_cs = p.PIN_9;
let dcx = p.PIN_8;
let miso = p.PIN_12;
let mosi = p.PIN_11;
let clk = p.PIN_10;
let touch_cs = p.PIN_16;
//let touch_irq = p.PIN_17;
// create SPI
let mut config = spi::Config::default();
config.frequency = DISPLAY_FREQ;
config.phase = spi::Phase::CaptureOnSecondTransition;
config.polarity = spi::Polarity::IdleHigh;
let spi = RefCell::new(SpiState {
last_mode: SpiMode::Display,
spi: Spi::new(p.SPI1, clk, mosi, miso, NoPin, config),
display_cs: Output::new(display_cs, Level::Low),
});
let mut touch = Touch::new(TouchSpi(&spi), Output::new(touch_cs, Level::High));
let dcx = Output::new(dcx, Level::Low);
let rst = Output::new(rst, Level::Low);
// dcx: 0 = command, 1 = data
// Enable LCD backlight
let _bl = Output::new(bl, Level::High);
// display interface abstraction from SPI and DC
let di = SPIInterfaceNoCS::new(DisplaySpi(&spi), dcx);
// create driver
let mut display = ST7789::new(di, rst, 240, 320);
// initialize
display.init(&mut Delay).unwrap();
// set default orientation
display.set_orientation(Orientation::Landscape).unwrap();
display.clear(Rgb565::BLACK).unwrap();
let raw_image_data = ImageRawLE::new(include_bytes!("../../assets/ferris.raw"), 86);
let ferris = Image::new(&raw_image_data, Point::new(34, 68));
// Display the image
ferris.draw(&mut display).unwrap();
let style = MonoTextStyle::new(&FONT_10X20, Rgb565::GREEN);
Text::new(
"Hello embedded_graphics \n + embassy + RP2040!",
Point::new(20, 200),
style,
)
.draw(&mut display)
.unwrap();
loop {
if let Some((x, y)) = touch.read() {
let style = PrimitiveStyleBuilder::new()
.fill_color(Rgb565::BLUE)
.build();
Rectangle::new(Point::new(x - 1, y - 1), Size::new(3, 3))
.into_styled(style)
.draw(&mut display)
.unwrap();
}
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum SpiMode {
Display,
Touch,
}
struct SpiState {
spi: Spi<'static, peripherals::SPI1>,
display_cs: Output<'static, peripherals::PIN_9>,
last_mode: SpiMode,
}
const DISPLAY_FREQ: u32 = 64_000_000;
const TOUCH_FREQ: u32 = 200_000;
struct DisplaySpi<'a>(&'a RefCell<SpiState>);
impl<'a> embedded_hal::blocking::spi::Write<u8> for DisplaySpi<'a> {
type Error = core::convert::Infallible;
fn write(&mut self, words: &[u8]) -> Result<(), Self::Error> {
let this = &mut *self.0.borrow_mut();
if this.last_mode != SpiMode::Display {
this.spi.set_frequency(DISPLAY_FREQ);
this.display_cs.set_low();
this.last_mode = SpiMode::Display;
}
this.spi.write(words);
Ok(())
}
}
struct TouchSpi<'a>(&'a RefCell<SpiState>);
impl<'a> embedded_hal::blocking::spi::Transfer<u8> for TouchSpi<'a> {
type Error = core::convert::Infallible;
fn transfer<'w>(&mut self, words: &'w mut [u8]) -> Result<&'w [u8], Self::Error> {
let this = &mut *self.0.borrow_mut();
if this.last_mode != SpiMode::Touch {
this.spi.set_frequency(TOUCH_FREQ);
this.display_cs.set_high();
this.last_mode = SpiMode::Touch;
}
this.spi.transfer(words);
Ok(words)
}
}
struct Calibration {
x1: i32,
x2: i32,
y1: i32,
y2: i32,
sx: i32,
sy: i32,
}
const CALIBRATION: Calibration = Calibration {
x1: 3880,
x2: 340,
y1: 262,
y2: 3850,
sx: 320,
sy: 240,
};
struct Touch<
SPI: embedded_hal::blocking::spi::Transfer<u8>,
CS: embedded_hal::digital::v2::OutputPin,
> {
spi: SPI,
cs: CS,
}
impl<SPI: embedded_hal::blocking::spi::Transfer<u8>, CS: embedded_hal::digital::v2::OutputPin>
Touch<SPI, CS>
where
SPI::Error: Debug,
CS::Error: Debug,
{
pub fn new(spi: SPI, cs: CS) -> Self {
Self { spi, cs }
}
pub fn read(&mut self) -> Option<(i32, i32)> {
self.cs.set_low().unwrap();
let mut buf = [0x90, 0x00, 0x00, 0xd0, 0x00, 0x00];
self.spi.transfer(&mut buf).unwrap();
self.cs.set_high().unwrap();
let x = ((buf[1] as u32) << 5 | (buf[2] as u32) >> 3) as i32;
let y = ((buf[4] as u32) << 5 | (buf[5] as u32) >> 3) as i32;
let cal = &CALIBRATION;
let x = ((x - cal.x1) * cal.sx / (cal.x2 - cal.x1)).clamp(0, cal.sx);
let y = ((y - cal.y1) * cal.sy / (cal.y2 - cal.y1)).clamp(0, cal.sy);
if x == 0 && y == 0 {
None
} else {
Some((x, y))
}
}
}
|
