Make the nrf Twim RAM buffer a instance variable instead of stack allocated

examples/nrf52840/src/bin/twim.rs

@@ -9,6 +9,7 @@ use defmt::*;
 use embassy_executor::Spawner;
 use embassy_nrf::twim::{self, Twim};
 use embassy_nrf::{bind_interrupts, peripherals};
+use static_cell::ConstStaticCell;
 use {defmt_rtt as _, panic_probe as _};
 
 const ADDRESS: u8 = 0x50;
@@ -22,7 +23,8 @@ async fn main(_spawner: Spawner) {
     let p = embassy_nrf::init(Default::default());
     info!("Initializing TWI...");
     let config = twim::Config::default();
-    let mut twi = Twim::new(p.TWISPI0, Irqs, p.P0_03, p.P0_04, config);
+    static RAM_BUFFER: ConstStaticCell<[u8; 16]> = ConstStaticCell::new([0; 16]);
+    let mut twi = Twim::new(p.TWISPI0, Irqs, p.P0_03, p.P0_04, config, RAM_BUFFER.take());
 
     info!("Reading...");
 

examples/nrf52840/src/bin/twim_lowpower.rs

@@ -30,6 +30,7 @@ async fn main(_p: Spawner) {
     loop {
         info!("Initializing TWI...");
         let config = twim::Config::default();
+        let mut ram_buffer = [0u8; 16];
 
         // Create the TWIM instance with borrowed singletons, so they're not consumed.
         let mut twi = Twim::new(
@@ -38,6 +39,7 @@ async fn main(_p: Spawner) {
             p.P0_03.reborrow(),
             p.P0_04.reborrow(),
             config,
+            &mut ram_buffer,
         );
 
         info!("Reading...");