Feature/qingke v4 delay

[romainreignier]

To close #27 I have looked at the QingKeV4 Microprocessor Manual and the register names are the same for the QingKeV2 and QingKeV4 except than on QingKeV2 the Systick timer is 32-bit and on the QingKeV4 it is a 64-bit timer.
But given the implementation, we reset the timer to 0 for each delay and delay_ns() takes a u32 so I had the same implementation for both processors, hence the use of the same file.

I have also included a basic example without embassy. I have renamed the blinky using embassy embassy_blinky to use the embassy_ prefix as done in esp-hal examples. Let me know if you are ok with this. I can rename the other examples for more consistency.

Note that according to the issue #6 I had to make these changes to run the examples:

diff --git a/Cargo.toml b/Cargo.toml
index b7750e4..24752da 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -37,10 +37,10 @@ defmt = { version = "0.3.5", optional = true }
 embassy-sync = { version = "0.6.0", optional = true }
 embassy-futures = { version = "0.1.1", optional = true }
 embassy-time-driver = { version = "0.1.0", features = [
-    "tick-hz-1_000_000",
+    "tick-hz-10_000",
 ], optional = true }
 embassy-time = { version = "0.3.0", features = [
-    "tick-hz-1_000_000",
+    "tick-hz-10_000",
 ], optional = true }
 embassy-usb-driver = "0.1.0"
 
diff --git a/examples/ch32v307/Cargo.toml b/examples/ch32v307/Cargo.toml
index eda3ed0..c1008f6 100644
--- a/examples/ch32v307/Cargo.toml
+++ b/examples/ch32v307/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-ch32-hal = { path = "../../", features = ["ch32v307vct6", "embassy", "rt"] }
+ch32-hal = { path = "../../", features = ["ch32v305rbt6", "embassy", "rt"] }
 embassy-executor = { version = "0.5.0", features = [
     "nightly",
     "integrated-timers",

[andelf]

Better make it not(time-driver-systick). time-driver-systick is not added yet.
You can leave the remaining fix to me.

[romainreignier]

I don't really understand where systick_rv4 comes from.
And time-driver-systick does not exist so the condition will always be true, right?

[andelf]

And time-driver-systick does not exist so the condition will always be true, right?

Yes. I'll add the required cfg flags in build.rs.

systick_rv4 comes from the following(generated via build.rs):

• https://github.com/ch32-rs/ch32-data/blob/main/data/registers/systick_rv4.yaml

And

ch32-hal/build.rs

Lines 76 to 82 in 56de16c

	// Add peripheral cfg flags on the fly
	for p in METADATA.peripherals {
	if let Some(r) = &p.registers {
	println!("cargo:rustc-cfg={}", r.kind);
	println!("cargo:rustc-cfg={}_{}", r.kind, r.version);
	}
	}