Initial commit

.cargo/config.toml

@@ -0,0 +1,8 @@
+[build]
+target = "riscv32i-unknown-none-elf"
+
+[target.riscv32i-unknown-none-elf]
+rustflags = [
+  "-C", "link-arg=-Tmemory.x",
+  "-C", "link-arg=-Tlink.x",
+]

.gitignore

@@ -0,0 +1 @@
+/target

Cargo.lock

@@ -0,0 +1,116 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "critical-section"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "790eea4361631c5e7d22598ecd5723ff611904e3344ce8720784c93e3d83d40b"
+
+[[package]]
+name = "embedded-hal"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "361a90feb7004eca4019fb28352a9465666b24f840f5c3cddf0ff13920590b89"
+
+[[package]]
+name = "lw-riscv"
+version = "0.1.0"
+dependencies = [
+ "riscv",
+ "riscv-rt",
+]
+
+[[package]]
+name = "paste"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
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+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
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+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "riscv"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ea8ff73d3720bdd0a97925f0bf79ad2744b6da8ff36be3840c48ac81191d7a7"
+dependencies = [
+ "critical-section",
+ "embedded-hal",
+ "paste",
+ "riscv-macros",
+ "riscv-pac",
+]
+
+[[package]]
+name = "riscv-macros"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f265be5d634272320a7de94cea15c22a3bfdd4eb42eb43edc528415f066a1f25"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "riscv-pac"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
+name = "riscv-rt"
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+dependencies = [
+ "riscv",
+ "riscv-pac",
+ "riscv-rt-macros",
+]
+
+[[package]]
+name = "riscv-rt-macros"
+version = "0.2.2"
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.93"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c786062daee0d6db1132800e623df74274a0a87322d8e183338e01b3d98d058"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
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Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "lw-riscv"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+riscv = "0.12.1"
+riscv-rt = "0.13.0"

memory.x

@@ -0,0 +1,12 @@
+MEMORY
+{
+  RAM : ORIGIN = 0x10000000, LENGTH = 16K
+  FLASH : ORIGIN = 0x00000000, LENGTH = 256K
+}
+
+REGION_ALIAS("REGION_TEXT", FLASH);
+REGION_ALIAS("REGION_RODATA", FLASH);
+REGION_ALIAS("REGION_DATA", RAM);
+REGION_ALIAS("REGION_BSS", RAM);
+REGION_ALIAS("REGION_HEAP", RAM);
+REGION_ALIAS("REGION_STACK", RAM);

src/main.rs

@@ -0,0 +1,24 @@
+#![no_std]
+#![no_main]
+
+use core::{panic::PanicInfo, ptr::write_volatile};
+use riscv::asm::nop;
+use riscv_rt::entry;
+
+#[panic_handler]
+fn panic_handler(_info: &PanicInfo) -> ! {
+    loop {}
+}
+
+#[entry]
+fn main() -> ! {
+    const MEM_ADDR: *mut u32 = 0x1000_0001 as *mut u32;
+    loop {
+        for i in 0..10 {
+            unsafe {
+                write_volatile(MEM_ADDR, 0b1101100+i);
+            }
+            nop();
+        }
+    }
+}