aw · March 8, 2021 03:29 · Mar 8, 2021 · Jan 17, 2021
diff --git a/sram.rs b/sram.rs
@@ -0,0 +1,74 @@
+#![no_std]
+#![no_main]
+
+use panic_halt as _;
+
+use embedded_graphics::fonts::{Font12x16, Text};
+use embedded_graphics::pixelcolor::Rgb565;
+use embedded_graphics::prelude::*;
+use embedded_graphics::primitives::Rectangle;
+use embedded_graphics::{primitive_style, text_style};
+use gd32vf103xx_hal::pac;
+use gd32vf103xx_hal::prelude::*;
+use longan_nano::{lcd, lcd_pins};
+use riscv_rt::entry;
+
+use gd32vf103xx_hal::spi::{Spi, MODE_0};
+use sram23x::*;
+
+#[entry]
+fn main() -> ! {
+    let dp = pac::Peripherals::take().unwrap();
+
+    // Configure clocks
+    let mut rcu = dp
+        .RCU
+        .configure()
+        .ext_hf_clock(8.mhz())
+        .sysclk(108.mhz())
+        .freeze();
+    let mut afio = dp.AFIO.constrain(&mut rcu);
+
+    let gpioa = dp.GPIOA.split(&mut rcu);
+    let gpiob = dp.GPIOB.split(&mut rcu);
+
+    let lcd_pins = lcd_pins!(gpioa, gpiob);
+    let mut lcd = lcd::configure(dp.SPI0, lcd_pins, &mut afio, &mut rcu);
+    let (width, height) = (lcd.size().width as i32, lcd.size().height as i32);
+
+    // SRAM pins
+    let sck = gpiob.pb13.into_alternate_push_pull();
+    let miso = gpiob.pb14.into_floating_input();
+    let mosi = gpiob.pb15.into_alternate_push_pull();
+    let spi1 = Spi::spi1(dp.SPI1, (sck, miso, mosi), MODE_0, 4.mhz(), &mut rcu);
+    let hold = gpioa.pa0.into_push_pull_output();
+    let cs = gpioa.pa3.into_push_pull_output();
+
+    // Write 'abcdABCD' to SRAM at memory address 0x00
+    let mut sram = Sram23x::new(spi1, cs, hold, device_type::M23xv1024).unwrap();
+    sram.set_mode(OperatingMode::Sequential as u8).unwrap();
+    let mut data: [u8; 8] = ['a' as u8, 'b' as u8, 'c' as u8, 'd' as u8, 65, 66, 67, 68];
+    sram.write_sequential(0x00_u32, &mut data).unwrap();
+
+    // Read from SRAM at memory address 0x00
+    sram.read_sequential(0x00_u32, &mut data).unwrap();
+
+    // Convert the last 4 bytes into an str, to be displayed on the LCD
+    let sramstr = core::str::from_utf8(&data[4..]).unwrap();
+
+    // Clear screen
+    Rectangle::new(Point::new(0, 0), Point::new(width - 1, height - 1))
+        .into_styled(primitive_style!(fill_color = Rgb565::BLACK))
+        .draw(&mut lcd)
+        .unwrap();
+
+    let style = text_style!(font=Font12x16, text_color=Rgb565::YELLOW, background_color=Rgb565::BLACK);
+
+    // Create a text at position (20, 30) and draw it using style defined above
+    Text::new(&sramstr, Point::new(5, 5))
+        .into_styled(style)
+        .draw(&mut lcd)
+        .unwrap();
+
+    loop {}
+}