From 007fc8179546fbca6e8f6f3bb8643a116b146f38 Mon Sep 17 00:00:00 2001
From: D4VID <d4vid@d4vid.xyz>
Date: Sat, 4 Jan 2025 22:11:59 +0100
Subject: [PATCH] Running on lw cpu

---
 .gitignore  |  1 +
 Cargo.toml  | 11 +++++++++++
 Makefile    | 14 ++++++++++++++
 src/main.rs |  6 +++---
 4 files changed, 29 insertions(+), 3 deletions(-)
 create mode 100644 Makefile

diff --git a/.gitignore b/.gitignore
index ea8c4bf..56b93a1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /target
+text.bin
diff --git a/Cargo.toml b/Cargo.toml
index a5e7838..dcf0e86 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,3 +6,14 @@ edition = "2021"
 [dependencies]
 riscv = "0.12.1"
 riscv-rt = "0.13.0"
+
+# https://docs.rust-embedded.org/book/unsorted/speed-vs-size.html
+[profile.release]
+# symbols are nice and they don't increase the size on Flash
+debug = true
+codegen-units = 1
+opt-level = "z"
+
+[profile.dev.package."*"]
+codegen-units = 1
+opt-level = "z"
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..6d69614
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+default: extract
+
+build:
+	cargo build --release
+
+extract: build
+	riscv32-elf-objcopy -O binary --only-section=.text target/riscv32i-unknown-none-elf/release/lw-riscv text.bin
+
+size: extract
+	cargo size --release -- -A
+
+clean:
+	cargo clean
+	rm text.bin
diff --git a/src/main.rs b/src/main.rs
index 3a65e9d..b41be53 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -12,11 +12,11 @@ fn panic_handler(_info: &PanicInfo) -> ! {
 
 #[entry]
 fn main() -> ! {
-    const MEM_ADDR: *mut u32 = 0x1000_0001 as *mut u32;
+    const MEM_ADDR: *mut u32 = 0x1000_0004 as *mut u32;
     loop {
-        for i in 0..10 {
+        for i in 0..100 {
             unsafe {
-                write_volatile(MEM_ADDR, 0b1101100+i);
+                write_volatile(MEM_ADDR, 0b01101100+i);
             }
             nop();
         }