.cargo/config.toml

@@ -9,8 +9,4 @@
 runner = "elf2uf2-rs -d"
 
 [build]
-# Cortex-M0 and Cortex-M0+
+target = "thumbv8m.main-none-eabihf"
-target = "thumbv6m-none-eabi"
-
-[env]
-# DEFMT_LOG = "debug"

Cargo.toml

@@ -6,8 +6,19 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-embassy-executor = { version = "0.7.0", features = ["task-arena-size-32768", "arch-cortex-m", "executor-thread", "executor-interrupt", "integrated-timers"] }
+embassy-executor = { version = "0.7.0", features = [
-embassy-rp = { version = "0.1.0", features = ["unstable-pac", "time-driver", "critical-section-impl"] }
+    "task-arena-size-32768",
+    "arch-cortex-m",
+    "executor-thread",
+    "executor-interrupt",
+] }
+embassy-rp = { version = "0.3.1", features = [
+    "unstable-pac",
+    "time-driver",
+    "critical-section-impl",
+    "rp235xa",
+] }
 embassy-futures = { version = "0.1.1" }
 
-cortex-m-rt = "0.7.4"
+cortex-m-rt = "0.7.5"
+cortex-m = { version = "0.7.7", features = ["inline-asm"] }

build.rs

@@ -31,6 +31,4 @@ fn main() {
 
     println!("cargo:rustc-link-arg-bins=--nmagic");
     println!("cargo:rustc-link-arg-bins=-Tlink.x");
-    println!("cargo:rustc-link-arg-bins=-Tlink-rp.x");
-    // println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
 }

memory.x

@@ -1,17 +1,75 @@
 MEMORY {
-    BOOT2 : ORIGIN = 0x10000000, LENGTH = 0x100
+    /*
-    FLASH : ORIGIN = 0x10000100, LENGTH = 2048K - 0x100
+     * The RP2350 has either external or internal flash.
+     *
+     * 2 MiB is a safe default here, although a Pico 2 has 4 MiB.
+     */
+    FLASH : ORIGIN = 0x10000000, LENGTH = 2048K
+    /*
+     * RAM consists of 8 banks, SRAM0-SRAM7, with a striped mapping.
+     * This is usually good for performance, as it distributes load on
+     * those banks evenly.
+     */
+    RAM : ORIGIN = 0x20000000, LENGTH = 512K
+    /*
+     * RAM banks 8 and 9 use a direct mapping. They can be used to have
+     * memory areas dedicated for some specific job, improving predictability
+     * of access times.
+     * Example: Separate stacks for core0 and core1.
+     */
+    SRAM4 : ORIGIN = 0x20080000, LENGTH = 4K
+    SRAM5 : ORIGIN = 0x20081000, LENGTH = 4K
+}
 
-    /* Pick one of the two options for RAM layout     */
+SECTIONS {
+    /* ### Boot ROM info
+     *
+     * Goes after .vector_table, to keep it in the first 4K of flash
+     * where the Boot ROM (and picotool) can find it
+     */
+    .start_block : ALIGN(4)
+    {
+        __start_block_addr = .;
+        KEEP(*(.start_block));
+        KEEP(*(.boot_info));
+    } > FLASH
 
-    /* OPTION A: Use all RAM banks as one big block   */
+} INSERT AFTER .vector_table;
-    /* Reasonable, unless you are doing something     */
-    /* really particular with DMA or other concurrent */
-    /* access that would benefit from striping        */
-    RAM   : ORIGIN = 0x20000000, LENGTH = 264K
 
-    /* OPTION B: Keep the unstriped sections separate */
+/* move .text to start /after/ the boot info */
-    /* RAM: ORIGIN = 0x20000000, LENGTH = 256K        */
+_stext = ADDR(.start_block) + SIZEOF(.start_block);
-    /* SCRATCH_A: ORIGIN = 0x20040000, LENGTH = 4K    */
+
-    /* SCRATCH_B: ORIGIN = 0x20041000, LENGTH = 4K    */
+SECTIONS {
-}
+    /* ### Picotool 'Binary Info' Entries
+     *
+     * Picotool looks through this block (as we have pointers to it in our
+     * header) to find interesting information.
+     */
+    .bi_entries : ALIGN(4)
+    {
+        /* We put this in the header */
+        __bi_entries_start = .;
+        /* Here are the entries */
+        KEEP(*(.bi_entries));
+        /* Keep this block a nice round size */
+        . = ALIGN(4);
+        /* We put this in the header */
+        __bi_entries_end = .;
+    } > FLASH
+} INSERT AFTER .text;
+
+SECTIONS {
+    /* ### Boot ROM extra info
+     *
+     * Goes after everything in our program, so it can contain a signature.
+     */
+    .end_block : ALIGN(4)
+    {
+        __end_block_addr = .;
+        KEEP(*(.end_block));
+    } > FLASH
+
+} INSERT AFTER .uninit;
+
+PROVIDE(start_to_end = __end_block_addr - __start_block_addr);
+PROVIDE(end_to_start = __start_block_addr - __end_block_addr);