Add example for Spi bidi transfer mode

Author: no111u3

Cargo.toml

@@ -59,6 +59,8 @@ micromath = "1.0.0"
 cortex-m-rtic = "0.5.6"
 st7789 = "0.5.0"
 panic-rtt-core = "0.2.1"
+display-interface-spi = "0.4"
+ist7920 = "0.1.0"
 
 [features]
 device-selected = []
@@ -401,4 +403,8 @@ required-features = ["rt", "stm32f413", "fsmc_lcd"]
 
 [[example]]
 name= "pwm-input"
-required-features = ["stm32f446"]
+required-features = ["stm32f446"]
+
+[[example]]
+name = "ist7920_bidi_normal_spi"
+required-features = ["rt", "stm32f401"]

examples/ist7920_bidi_normal_spi.rs

@@ -0,0 +1,98 @@
+#![no_std]
+#![no_main]
+
+extern crate panic_halt;
+
+use cortex_m_rt::entry;
+
+use stm32f4xx_hal as hal;
+
+use crate::hal::{pac, prelude::*, spi::Spi};
+
+use hal::spi::{Mode, NoMiso, Phase, Polarity};
+
+use display_interface_spi::SPIInterface;
+use ist7920::Ist7920;
+
+#[entry]
+fn main() -> ! {
+    let dp = pac::Peripherals::take().unwrap();
+    let cp = cortex_m::peripheral::Peripherals::take().unwrap();
+
+    let gpioa = dp.GPIOA.split();
+    let gpiob = dp.GPIOB.split();
+    let rcc = dp.RCC.constrain();
+
+    let clocks = rcc.cfgr.freeze();
+
+    let mut led = gpioa.pa5.into_push_pull_output();
+    led.set_low();
+
+    let sck = gpiob.pb3.into_alternate();
+    let miso = NoMiso {};
+    let mosi = gpiob.pb5.into_alternate();
+
+    let dc = gpiob.pb4.into_push_pull_output();
+    let mut res = gpiob.pb10.into_push_pull_output();
+    let cs = gpiob.pb13.into_push_pull_output();
+
+    let mut delay = hal::delay::Delay::new(cp.SYST, &clocks);
+
+    let mode = Mode {
+        polarity: Polarity::IdleLow,
+        phase: Phase::CaptureOnFirstTransition,
+    };
+
+    // Change spi transfer mode to Bidi for more efficient operations.
+    let spi =
+        Spi::new(dp.SPI1, (sck, miso, mosi), mode, 8_000_000.hz(), clocks).to_bidi_transfer_mode();
+
+    let iface = SPIInterface::new(spi, dc, cs);
+
+    let mut display = Ist7920::new(iface);
+
+    display.reset(&mut res, &mut delay).ok();
+
+    display.init(&mut delay).ok();
+
+    let mut select_figure = 0;
+    loop {
+        delay.delay_ms(500_u16);
+        let (begin, end) = match select_figure {
+            0 => {
+                select_figure = 1;
+                ((48, 48), (48 + 31, 48 + 31))
+            }
+
+            1 => {
+                select_figure = 2;
+                ((32, 32), (32 + 63, 32 + 63))
+            }
+            _ => {
+                select_figure = 0;
+                ((24, 24), (24 + 79, 24 + 79))
+            }
+        };
+        display.clear().ok();
+        display.set_draw_area(begin, end).ok();
+        for _ in 0..((end.1 - begin.1 + 1) / 16) {
+            for _ in 0..((end.0 - begin.0 + 1) / 16) {
+                display
+                    .draw(&[
+                        0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xff, 0xff, 0xff, 0xff,
+                        0xff, 0xff, 0xff, 0xff,
+                    ])
+                    .ok();
+            }
+            for _ in 0..((end.0 - begin.0 + 1) / 16) {
+                display
+                    .draw(&[
+                        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00,
+                        0x00, 0x00, 0x00, 0x00,
+                    ])
+                    .ok();
+            }
+        }
+        led.toggle();
+    }
+}