tests: drivers: gpio-async: Basic gpio setup (WIP)

Enable the gpios, driving a single column, and reading a single row in a
loop with a delay.  This will be the gpio we will monitor.

Signed-off-by: David Brown <[email protected]>

Author: d3zd3z

tests/drivers/gpio-async/prj.conf

@@ -10,5 +10,6 @@ CONFIG_RUST=y
 
 CONFIG_RUST_ALLOC=y
 # CONFIG_LOG=y
+CONFIG_GPIO=y
 
 CONFIG_LOG_BACKEND_RTT=n

tests/drivers/gpio-async/src/lib.rs

@@ -5,7 +5,8 @@
 
 extern crate alloc;
 
-use zephyr::embassy::Executor;
+use embassy_time::{Duration, Timer};
+use zephyr::{embassy::Executor, raw::{GPIO_INPUT, GPIO_OUTPUT_ACTIVE, GPIO_PULL_DOWN}};
 
 use embassy_executor::Spawner;
 use log::info;
@@ -29,4 +30,31 @@ extern "C" fn rust_main() {
 async fn main(spawner: Spawner) {
     info!("Hello world");
     let _ = spawner;
+
+    let mut col0 = zephyr::devicetree::labels::col0::get_instance().unwrap();
+    let mut row0 = zephyr::devicetree::labels::row0::get_instance().unwrap();
+    let mut gpio_token = unsafe { zephyr::device::gpio::GpioToken::get_instance().unwrap() };
+
+    unsafe {
+        col0.configure(&mut gpio_token, GPIO_OUTPUT_ACTIVE);
+        col0.set(&mut gpio_token, true);
+        row0.configure(&mut gpio_token, GPIO_INPUT | GPIO_PULL_DOWN);
+    }
+
+    let mut last = false;
+
+    loop {
+        let current = unsafe { row0.get(&mut gpio_token) };
+        // info!("Current: {:?}", current);
+        if current != last {
+            if current {
+                info!("Pressed");
+            } else {
+                info!("Released");
+            }
+            last = current;
+        }
+
+        Timer::after(Duration::from_millis(25)).await;
+    }
 }