messages from leds prog

Author: MatrixMike

src/bin/bbcTest2.rs

@@ -0,0 +1,52 @@
+#![no_std]
+#![no_main]
+
+#[macro_use(entry, exception)]
+extern crate microbit;
+extern crate cortex_m;
+extern crate panic_abort;
+extern crate cortex_m_rt;
+
+use cortex_m_rt::ExceptionFrame;
+
+exception!(*, default_handler);
+
+fn default_handler(_irqn: i16) {}
+
+exception!(HardFault, hard_fault);
+
+fn hard_fault(_ef: &ExceptionFrame) -> ! {
+    loop {}
+}
+
+entry!(main_loop);
+
+fn main_loop() -> ! {
+    // OK, this is a very very optimistic code here.
+    let p = microbit::Peripherals::take().take().unwrap();
+
+    // configuring GPIO  pin P0.4 and P0.13 as output
+    // to control the matrix LED point (COL1, ROW1)
+    p.GPIO.pin_cnf[4].write(|w| w.dir().output());
+    p.GPIO.pin_cnf[13].write(|w| w.dir().output());
+    p.GPIO.out.write(|w| unsafe { w.bits(1 << 13) });
+
+    let mut state: bool = true;
+    loop {
+        // some simple delay with busy waiting
+        for _ in 0..1000 {
+            cortex_m::asm::nop();
+        }
+
+        // toggling the state variable that represents the blinking
+        state = !state;
+
+        if state {
+            // turn the LED on, but setting P0.4 to LOW and PO.13 to HIGH
+            p.GPIO.out.write(|w| unsafe { w.bits(1 << 13) });
+        } else {
+            // turn the LED off by setting both GPIO pins to LOW.
+            p.GPIO.out.write(|w| unsafe { w.bits(0) });
+        }
+    }
+}

src/bin/leds.rs

@@ -3,18 +3,30 @@
 
 extern crate panic_halt;
 // github.com therealprof / microbit
+use core::fmt::Write;
 use cortex_m_rt::entry;
 use microbit::led::Display;
 //use microbit::hal::i2c;
 use nrf51::Peripherals;
 use nrf51_hal::delay::Delay;
 use nrf51_hal::prelude::*;
+use nrf51_hal::serial::{Serial, BAUD115200};
 
 #[entry]
 fn main() -> ! {
+//	    let vector = vec![1, 3, 4, 5, 3];  // cannot find macro `vec!` in this scope
+        let _vc = [1,2,3,4,5];
+        let _mx = _vc.iter().max().unwrap();
+
+
     if let Some(p) = Peripherals::take() {
+		let gpio = p.GPIO.split();
+		let tx_pin = gpio.pin24.into_push_pull_output().downgrade();
+        let rx_pin = gpio.pin25.into_floating_input().downgrade();
+		let (mut tx, _) = Serial::uart0(p.UART0, tx_pin, rx_pin, BAUD115200).split();
+        write!(tx, "test output message\n\r").unwrap();
         let mut delay = Delay::new(p.TIMER0);
-        let gpio = p.GPIO.split();
+ //       let gpio = p.GPIO.split();
         let col1 = gpio.pin4.into_push_pull_output();
         let col2 = gpio.pin5.into_push_pull_output();
         let col3 = gpio.pin6.into_push_pull_output();
@@ -30,7 +42,8 @@ fn main() -> ! {
         let mut leds = Display::new(
             col1, col2, col3, col4, col5, col6, col7, col8, col9, row1, row2, row3,
         );
-
+//https://www.mathworks.com/help/supportpkg/microbit/ref/5x5ledmatrix.html
+//https://microbit.org/guide/hardware/leds/
         let checker_a = [
             [1, 0, 1, 0, 1],
             [0, 1, 0, 1, 0],