Experimental Gpio.HEADmaster

This rapidly blinks the sysled on the stm32.

This shows the ability to manipulate memory mapped registers.

1 files changed, 26 insertions, 3 deletions

diff --git a/src/main.rs b/src/main.rs
index 146f601..997e532 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,14 +2,37 @@
 #![no_std]
 
 use core::panic::PanicInfo;
+use hal::gpio::get_gpio_port_b;
 
+use crate::hal::gpio;
+
+mod hal;
 mod init;
 
 #[link_section = ".inits.999"]
 #[no_mangle]
-pub static __MAIN: fn() -> () = main;
-pub fn main() -> () {
-    loop {};
+pub static __MAIN: unsafe fn() -> () = main;
+pub unsafe fn main() -> () {
+    let mut pin = get_gpio_port_b().pin(3);
+    pin.set_mode(gpio::GpioMode::Output);
+    pin.set_output_type(gpio::GpioOutputType::PushPull);
+    pin.set_output_speed(gpio::GpioSpeed::Medium);
+    pin.set_pull_dir(gpio::GpioPullDir::Down);
+
+    pin.set_high();
+    loop {
+        delay();
+        pin.set_low();
+        delay();
+        pin.set_high();
+    }
+}
+
+fn delay() {
+    let mut cnt = 0;
+    while cnt < 10000 {
+        cnt += 1;
+    }
 }
 
 #[panic_handler]