Blinking achieved.

4 files changed, 170 insertions, 4 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 60e46fa..f03a28c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3,5 +3,123 @@
 version = 3
 
 [[package]]
+name = "aho-corasick"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "bare-metal"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5deb64efa5bd81e31fcd1938615a6d98c82eafcbcd787162b6f63b91d6bac5b3"
+dependencies = [
+ "rustc_version",
+]
+
+[[package]]
+name = "bit_field"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dcb6dd1c2376d2e096796e234a70e17e94cc2d5d54ff8ce42b28cef1d0d359a4"
+
+[[package]]
+name = "gd32vf103-pac"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ffd430737a49edbd1c0241b58cabe79a7ac7ebe208f67dc838c1c981eb60e83"
+dependencies = [
+ "bare-metal",
+ "riscv",
+ "vcell",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
 name = "luchie"
 version = "0.1.0"
+dependencies = [
+ "gd32vf103-pac",
+]
+
+[[package]]
+name = "memchr"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+
+[[package]]
+name = "regex"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c4eb3267174b8c6c2f654116623910a0fef09c4753f8dd83db29c48a0df988b"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3f87b73ce11b1619a3c6332f45341e0047173771e8b8b73f87bfeefb7b56244"
+
+[[package]]
+name = "riscv"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2f0b705d428e9d0f78e2bb73093887ee58a83c9688de3faedbb4c0631c4618e"
+dependencies = [
+ "bare-metal",
+ "bit_field",
+ "riscv-target",
+]
+
+[[package]]
+name = "riscv-target"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88aa938cda42a0cf62a20cfe8d139ff1af20c2e681212b5b34adb5a58333f222"
+dependencies = [
+ "lazy_static",
+ "regex",
+]
+
+[[package]]
+name = "rustc_version"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
+dependencies = [
+ "semver",
+]
+
+[[package]]
+name = "semver"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
+dependencies = [
+ "semver-parser",
+]
+
+[[package]]
+name = "semver-parser"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
+
+[[package]]
+name = "vcell"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77439c1b53d2303b20d9459b1ade71a83c716e3f9c34f3228c00e6f185d6c002"
diff --git a/Cargo.toml b/Cargo.toml
index 9a0078f..16741da 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,6 +17,7 @@ lto = true
 codegen-units = 1
 
 [dependencies]
+gd32vf103-pac = "0.4.0"
 
 [[bin]]
 name = "luchie"
diff --git a/device.lds b/device.lds
index ec4729d..d4ca9f1 100644
--- a/device.lds
+++ b/device.lds
@@ -50,5 +50,5 @@ SECTIONS
         . = ALIGN(2);
         PROVIDE(_memory_start = ORIGIN(RAM));
         PROVIDE(_memory_end = _memory_start + LENGTH(RAM));
-        PROVIDE(_stack_top = . + _memory_end);
+        PROVIDE(_stack_top = _memory_end);
 }
diff --git a/src/main.rs b/src/main.rs
index 0f77639..c0d41d3 100755
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,10 +4,49 @@
 #![no_main]
 
 use core::arch::asm;
+use gd32vf103_pac::Peripherals;
 
 #[no_mangle]
 fn main(_hartid: usize) -> ! {
-    loop {}
+    // let peripherals = Peripherals::take().unwrap();
+    let peripherals = unsafe { Peripherals::steal() };
+
+    let rcu = peripherals.RCU;
+    // enable RCU_GPIOA
+    rcu.apb2en.write(|w| {
+        w.paen().set_bit()
+    });
+
+    let gpio = peripherals.GPIOA;
+    // led is gpioa pin 7 output push/pull 50mhz
+    gpio.ctl0.write(|w| unsafe {
+        // output mode, push-pull
+        w.ctl7().bits(0b00);
+        // 50 mhz output rate
+        w.md7().bits(0b11);
+        w
+    });
+
+    let mut led_on = false;
+    loop {
+        if led_on {
+            gpio.bc.write(|w| w.cr7().set_bit());
+            if gpio.octl.read().octl7().bit() {
+                panic!("not set");
+            }
+        } else {
+            gpio.bop.write(|w| w.bop7().set_bit());
+            if !gpio.octl.read().octl7().bit() {
+                panic!("set");
+            }
+        }
+        led_on = !led_on;
+
+        let mut a = 0;
+        for _ in 1..100_000 {
+            a = gpio.octl.read().bits();
+        }
+    }
 }
 
 #[naked]
@@ -27,12 +66,20 @@ unsafe extern "C" fn _start() -> ! {
         "csrr a0, mhartid",
         "la sp, _stack_top",
 
-        "j main",
+        "tail main",
         options(noreturn)
     )
 }
 
 #[panic_handler]
-fn panic(_info: &core::panic::PanicInfo) -> ! {
+fn panic(info: &core::panic::PanicInfo) -> ! {
+    if let Some(loc) = info.location() {
+        let _file = loc.file();
+        let _line = loc.line();
+        if let Some(_msg) = info.payload().downcast_ref::<&str>() {
+            loop {}
+        }
+        loop {}
+    }
     loop {}
 }