Fixed build issues.

Signed-off-by: Yilin Sun <imi415@imi.moe>

.cargo/config.toml

@@ -1,7 +1,8 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
 rustflags = [
   # LLD (shipped with the Rust toolchain) is used as the default linker
   "-C", "link-arg=-Tlink.x",
 ]
 
 [build]
-target = "thumbv6m-none-eabi"        # Cortex-M0 and Cortex-M0+
+target = "thumbv6m-none-eabi"

Cargo.lock

@@ -46,6 +46,7 @@ checksum = "8ec610d8f49840a5b376c69663b6369e71f4b34484b9b2eb29fb918d92516cb9"
 dependencies = [
  "bare-metal",
  "bitfield",
+ "critical-section",
  "embedded-hal",
  "volatile-register",
 ]

Cargo.toml

@@ -7,7 +7,7 @@ edition = "2021"
 
 [dependencies]
 ch57x-pac = {git = "https://git.minori.work/Embedded_SDK/WCH_CH57x_PAC.git", features = ["critical-section"]}
-cortex-m = "0.7.6"
+cortex-m = {version = "0.7.6", features = ["critical-section-single-core"]}
 cortex-m-rt = "0.6.13"
 cortex-m-semihosting = "0.3.3"
 panic-halt = "0.2.0"

src/main.rs

@@ -3,7 +3,6 @@
 
 use panic_halt as _;
 
-use cortex_m::asm;
 use cortex_m::peripheral::syst;
 use cortex_m_rt::entry;
 
@@ -17,14 +16,30 @@ fn main() -> ! {
     let mut systick = core_peripherals.SYST;
 
     systick.set_clock_source(syst::SystClkSource::Core);
-    systick.set_reload(16_000);
+    systick.set_reload(8_000_000);
     systick.clear_current();
 
     systick.enable_counter();
 
-    while !systick.has_wrapped() {
-        asm::nop();
-    }
+    let ch57x_sys = peripherals.SYS;
 
-    loop {}
+    /* PB0: LED, data set to 1 */
+    ch57x_sys.r32_pb_out__r8_slv_rd_data.modify(|r, w| unsafe {
+        w.bits(r.bits() | 0x01)
+    });
+
+    /* PB0: LED, direction set to output */
+    ch57x_sys.r32_pb_dir.modify(|r, w| unsafe {
+        w.bits(r.bits() | 0x01)
+    });
+
+    loop {
+        while !systick.has_wrapped() {
+        }
+
+        /* Toggle LED */
+        ch57x_sys.r32_pb_out__r8_slv_rd_data.modify(|r, w| unsafe {
+            w.bits(r.bits() ^ 0x01)
+        });
+    }
 }