From 5ef16da1000155161b68b20144ae7eee29ca5f19 Mon Sep 17 00:00:00 2001
From: Lorenzo Good <foehammer@disroot.org>
Date: Mon, 1 Jun 2026 18:19:56 -0400
Subject: [PATCH] Flashing & Blinky

---
 .cargo/config.toml    |  3 +++
 Cargo.toml            |  8 ++++++++
 debug/flash_procs.tcl | 12 ++++++++++++
 debug/openocd.cfg     |  6 ++++++
 debug/openocd.gdb     |  3 +++
 memory.x              |  4 ++--
 src/main.rs           |  8 ++++++--
 7 files changed, 40 insertions(+), 4 deletions(-)
 create mode 100644 debug/flash_procs.tcl
 create mode 100644 debug/openocd.cfg
 create mode 100644 debug/openocd.gdb

diff --git a/.cargo/config.toml b/.cargo/config.toml
index 45acf6e..4b7f228 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -3,3 +3,6 @@ target = "thumbv7m-none-eabi"
 rustflags = [
   "-C", "link-arg=-Tlink.x",
 ]
+
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+runner = "arm-none-eabi-gdb -q -x debug/openocd.gdb"
diff --git a/Cargo.toml b/Cargo.toml
index 4edcdd8..2ac548e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,4 +9,12 @@ cortex-m-rt = "0.7.5"
 panic-halt = "1.0.0"
 stm32l4xx-hal = { version = "0.7.1", features = ["rt", "stm32l433"] }
 
+[profile.dev]
+opt-level = 1  # we don't fit at 0, and check is nice
 
+[profile.release]
+codegen-units = 1
+debug = true
+lto = true
+opt-level = "z"
+overflow-checks = true
\ No newline at end of file
diff --git a/debug/flash_procs.tcl b/debug/flash_procs.tcl
new file mode 100644
index 0000000..b64f7f7
--- /dev/null
+++ b/debug/flash_procs.tcl
@@ -0,0 +1,12 @@
+init
+
+proc flash_stm32 {FILE} {
+    reset halt
+    sleep 100
+    wait_halt 2
+
+    flash write_image erase $FILE
+    verify_image $FILE
+
+    reset run
+}
diff --git a/debug/openocd.cfg b/debug/openocd.cfg
new file mode 100644
index 0000000..073ef52
--- /dev/null
+++ b/debug/openocd.cfg
@@ -0,0 +1,6 @@
+source [find interface/cmsis-dap.cfg]
+source [find target/stm32l4x.cfg]
+
+source "flash_procs.tcl"
+
+adapter speed 200
\ No newline at end of file
diff --git a/debug/openocd.gdb b/debug/openocd.gdb
new file mode 100644
index 0000000..70f0ee9
--- /dev/null
+++ b/debug/openocd.gdb
@@ -0,0 +1,3 @@
+target extended-remote localhost:3333
+load
+tui layout src
\ No newline at end of file
diff --git a/memory.x b/memory.x
index fdf940d..e6300eb 100644
--- a/memory.x
+++ b/memory.x
@@ -2,8 +2,8 @@ MEMORY
 {
   /* NOTE K = KiBi = 1024 bytes */
   /* TODO Adjust these memory regions to match your device memory layout */
-  FLASH : ORIGIN = 0x8000000, LENGTH = 128K
-  RAM : ORIGIN = 0x20000000, LENGTH = 32K
+  FLASH : ORIGIN = 0x8000000, LENGTH = 256K
+  RAM : ORIGIN = 0x20000000, LENGTH = 64K
 }
 
 /* This is where the call stack will be allocated. */
diff --git a/src/main.rs b/src/main.rs
index b64dd4a..8bd372b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -6,7 +6,10 @@
 use panic_halt;
 
 use cortex_m_rt::entry;
-use stm32l4xx_hal::{prelude::*, flash::FlashExt, gpio::GpioExt, pac, pwr::PwrExt, rcc::RccExt, time::Hertz, delay::Delay};
+use stm32l4xx_hal::{
+    delay::Delay, flash::FlashExt, gpio::GpioExt, pac, prelude::*, pwr::PwrExt, rcc::RccExt,
+    time::Hertz,
+};
 
 #[entry]
 fn main() -> ! {
@@ -20,7 +23,8 @@ fn main() -> ! {
     // Ok for now, but ideally actually think about what this does (especially when we have tim).
     let clocks = rcc
         .cfgr
-        .hclk(Hertz::MHz(8))
+        .sysclk(Hertz::MHz(64))
+        .pclk1(Hertz::MHz(32))
         .freeze(&mut flash.acr, &mut pwr);
 
     let mut gpioa = dp.GPIOA.split(&mut rcc.ahb2);