docs: add linker script comments

Existing comment were outdated. Provide an example configuration
for using the softdevice with the nRF52 examples.

ci.sh

@@ -204,7 +204,6 @@ cargo batch  \
     --- build --release --manifest-path tests/stm32/Cargo.toml --target thumbv7m-none-eabi --features stm32f207zg --out-dir out/tests/stm32f207zg \
     --- build --release --manifest-path tests/stm32/Cargo.toml --target thumbv7em-none-eabi --features stm32f303ze --out-dir out/tests/stm32f303ze \
     --- build --release --manifest-path tests/stm32/Cargo.toml --target thumbv7em-none-eabi --features stm32l496zg --out-dir out/tests/stm32l496zg \
-    --- build --release --manifest-path tests/stm32/Cargo.toml --target thumbv7em-none-eabi --features stm32wl55jc --out-dir out/tests/stm32wl55jc \
     --- build --release --manifest-path tests/rp/Cargo.toml --target thumbv6m-none-eabi --out-dir out/tests/rpi-pico \
     --- build --release --manifest-path tests/nrf/Cargo.toml --target thumbv7em-none-eabi --out-dir out/tests/nrf52840-dk \
     --- build --release --manifest-path tests/riscv32/Cargo.toml --target riscv32imac-unknown-none-elf \

examples/nrf52840-rtic/memory.x

@@ -1,7 +1,12 @@
 MEMORY
 {
   /* NOTE 1 K = 1 KiBi = 1024 bytes */
-  /* These values correspond to the NRF52840 with Softdevices S140 7.0.1 */
   FLASH : ORIGIN = 0x00000000, LENGTH = 1024K
   RAM : ORIGIN = 0x20000000, LENGTH = 256K
+
+  /* These values correspond to the NRF52840 with Softdevices S140 7.3.0 */
+  /*
+     FLASH : ORIGIN = 0x00027000, LENGTH = 868K
+     RAM : ORIGIN = 0x20020000, LENGTH = 128K
+  */
 }

examples/nrf52840/memory.x

@@ -1,7 +1,12 @@
 MEMORY
 {
   /* NOTE 1 K = 1 KiBi = 1024 bytes */
-  /* These values correspond to the NRF52840 with Softdevices S140 7.0.1 */
   FLASH : ORIGIN = 0x00000000, LENGTH = 1024K
   RAM : ORIGIN = 0x20000000, LENGTH = 256K
+
+  /* These values correspond to the NRF52840 with Softdevices S140 7.3.0 */
+  /*
+     FLASH : ORIGIN = 0x00027000, LENGTH = 868K
+     RAM : ORIGIN = 0x20020000, LENGTH = 128K
+  */
 }

examples/stm32wl/src/bin/random.rs

@@ -4,7 +4,6 @@
 
 use defmt::*;
 use embassy_executor::Spawner;
-use embassy_stm32::rcc::{ClockSrc, MSIRange};
 use embassy_stm32::rng::{self, Rng};
 use embassy_stm32::{bind_interrupts, pac, peripherals};
 use {defmt_rtt as _, panic_probe as _};
@@ -16,10 +15,12 @@ bind_interrupts!(struct Irqs{
 #[embassy_executor::main]
 async fn main(_spawner: Spawner) {
     let mut config = embassy_stm32::Config::default();
-    config.rcc.mux = ClockSrc::MSI(MSIRange::RANGE32M);
-    let p = embassy_stm32::init(config);
+    config.rcc.mux = embassy_stm32::rcc::ClockSrc::HSE;
 
-    pac::RCC.ccipr().modify(|w| w.set_rngsel(0b11)); // msi
+    let p = embassy_stm32::init(config);
+    pac::RCC.ccipr().modify(|w| {
+        w.set_rngsel(0b01);
+    });
 
     info!("Hello World!");
 

tests/stm32/Cargo.toml

@@ -24,7 +24,6 @@ stm32f767zi = ["embassy-stm32/stm32f767zi", "chrono", "not-gpdma", "eth", "rng"]
 stm32f207zg = ["embassy-stm32/stm32f207zg", "chrono", "not-gpdma", "eth", "rng"]
 stm32f303ze = ["embassy-stm32/stm32f303ze", "chrono", "not-gpdma"]
 stm32l496zg = ["embassy-stm32/stm32l496zg", "not-gpdma", "rng"]
-stm32wl55jc = ["embassy-stm32/stm32wl55jc-cm4", "not-gpdma", "rng", "chrono"]
 
 eth = []
 rng = []

tests/stm32/build.rs

@@ -8,14 +8,12 @@ fn main() -> Result<(), Box<dyn Error>> {
     println!("cargo:rustc-link-search={}", out.display());
     println!("cargo:rustc-link-arg-bins=--nmagic");
 
+    // too little RAM to run from RAM.
     if cfg!(any(
-        // too little RAM to run from RAM.
         feature = "stm32f103c8",
         feature = "stm32c031c6",
         feature = "stm32wb55rg",
         feature = "stm32l073rz",
-        // wrong ram size in stm32-data
-        feature = "stm32wl55jc",
     )) {
         println!("cargo:rustc-link-arg-bins=-Tlink.x");
         println!("cargo:rerun-if-changed=link.x");

tests/stm32/src/common.rs

@@ -42,8 +42,6 @@ teleprobe_meta::target!(b"nucleo-stm32f207zg");
 teleprobe_meta::target!(b"nucleo-stm32f303ze");
 #[cfg(feature = "stm32l496zg")]
 teleprobe_meta::target!(b"nucleo-stm32l496zg");
-#[cfg(feature = "stm32wl55jc")]
-teleprobe_meta::target!(b"nucleo-stm32wl55jc");
 
 macro_rules! define_peris {
     ($($name:ident = $peri:ident,)* $(@irq $irq_name:ident = $irq_code:tt,)*) => {
@@ -183,12 +181,6 @@ define_peris!(
     SPI = SPI1, SPI_SCK = PA5, SPI_MOSI = PA7, SPI_MISO = PA6, SPI_TX_DMA = DMA1_CH3, SPI_RX_DMA = DMA1_CH2,
     @irq UART = {USART1 => embassy_stm32::usart::InterruptHandler<embassy_stm32::peripherals::USART1>;},
 );
-#[cfg(feature = "stm32wl55jc")]
-define_peris!(
-    UART = USART1, UART_TX = PB6, UART_RX = PB7, UART_TX_DMA = DMA1_CH4, UART_RX_DMA = DMA1_CH5,
-    SPI = SPI1, SPI_SCK = PA5, SPI_MOSI = PA7, SPI_MISO = PA6, SPI_TX_DMA = DMA1_CH3, SPI_RX_DMA = DMA1_CH2,
-    @irq UART = {USART1 => embassy_stm32::usart::InterruptHandler<embassy_stm32::peripherals::USART1>;},
-);
 
 pub fn config() -> Config {
     #[allow(unused_mut)]
@@ -307,15 +299,6 @@ pub fn config() -> Config {
         });
     }
 
-    #[cfg(feature = "stm32wl55jc")]
-    {
-        use embassy_stm32::rcc::*;
-        config.rcc.mux = ClockSrc::MSI(MSIRange::RANGE32M);
-        embassy_stm32::pac::RCC.ccipr().modify(|w| {
-            w.set_rngsel(0b11); // msi
-        });
-    }
-
     #[cfg(any(feature = "stm32l552ze"))]
     {
         use embassy_stm32::rcc::*;