Add feature to reserve Bluetooth RAM for ESP32 (#63)

esp32-hal/Cargo.toml

@@ -45,3 +45,4 @@ smart-leds        = "0.3"
 default = ["rt"]
 rt      = ["xtensa-lx-rt/esp32"]
 ufmt    = ["esp-hal-common/ufmt"]
+bluetooth = []

esp32-hal/build.rs

@@ -23,9 +23,38 @@ fn main() {
         .write_all(include_bytes!("ld/linkall.x"))
         .unwrap();
 
+    let memory_extras = generate_memory_extras();
+    File::create(out.join("memory_extras.x"))
+        .unwrap()
+        .write_all(&memory_extras)
+        .unwrap();
+
     println!("cargo:rustc-link-search={}", out.display());
 
     // Only re-run the build script when memory.x is changed,
     // instead of when any part of the source code changes.
     println!("cargo:rerun-if-changed=memory.x");
 }
+
+fn generate_memory_extras() -> Vec<u8> {
+    let reserve_dram = if cfg!(feature = "bluetooth") {
+        "0x10000"
+    } else {
+        "0x0"
+    };
+
+    format!(
+        "
+    /* reserved at the start of DRAM for e.g. the BT stack */
+    RESERVE_DRAM = {reserve_dram};
+    
+    /* reserved at the start of the RTC memories for use by the ULP processor */
+    RESERVE_RTC_FAST = 0;
+    RESERVE_RTC_SLOW = 0;
+    
+    /* define stack size for both cores */
+    STACK_SIZE = 8k;"
+    )
+    .as_bytes()
+    .to_vec()
+}

esp32-hal/ld/memory.x

@@ -8,15 +8,7 @@
 /* override entry point */
 ENTRY(ESP32Reset)
 
-/* reserved at the start of DRAM for e.g. teh BT stack */
-RESERVE_DRAM = 0;
-
-/* reserved at the start of the RTC memories for use by the ULP processor */
-RESERVE_RTC_FAST = 0;
-RESERVE_RTC_SLOW = 0;
-
-/* define stack size for both cores */
-STACK_SIZE = 8k;
+INCLUDE "memory_extras.x"
 
 /* Specify main memory areas */
 MEMORY

esp32s3-hal/src/lib.rs

@@ -9,8 +9,8 @@ pub use esp_hal_common::{
     pulse_control,
     ram,
     spi,
-    utils,
     usb_serial_jtag,
+    utils,
     Cpu,
     Delay,
     PulseControl,