Remove rand(), fixes #50

embassy-std/Cargo.toml

@@ -6,5 +6,4 @@ edition = "2018"
 
 [dependencies]
 embassy     = { version = "0.1.0", path = "../embassy", features = ["std"] }
-lazy_static = "1.4.0"
-rand_core   = { version = "0.6.0", features = ["std"] }
+lazy_static = "1.4.0"

embassy-std/src/lib.rs

@@ -1,7 +1,6 @@
 use embassy::executor::{raw, Spawner};
 use embassy::time::TICKS_PER_SECOND;
 use embassy::time::{Alarm, Clock};
-use rand_core::{OsRng, RngCore};
 use std::marker::PhantomData;
 use std::mem::MaybeUninit;
 use std::ptr;
@@ -19,13 +18,6 @@ impl Clock for StdClock {
     }
 }
 
-struct StdRand;
-impl embassy::rand::Rand for StdRand {
-    fn rand(&self, buf: &mut [u8]) {
-        OsRng.fill_bytes(buf);
-    }
-}
-
 static mut ALARM_AT: u64 = u64::MAX;
 
 pub struct StdAlarm;
@@ -101,7 +93,6 @@ impl Executor {
         unsafe {
             CLOCK_ZERO.as_mut_ptr().write(StdInstant::now());
             embassy::time::set_clock(&StdClock);
-            embassy::rand::set_rand(&StdRand);
         }
 
         Self {

embassy/src/lib.rs

@@ -13,7 +13,6 @@ pub mod flash;
 pub mod gpio;
 pub mod interrupt;
 pub mod io;
-pub mod rand;
 pub mod time;
 pub mod uart;
 pub mod util;

embassy/src/rand.rs

@@ -1,15 +0,0 @@
-use crate::fmt::*;
-
-pub trait Rand {
-    fn rand(&self, buf: &mut [u8]);
-}
-
-static mut RAND: Option<&'static dyn Rand> = None;
-
-pub unsafe fn set_rand(rand: &'static dyn Rand) {
-    RAND = Some(rand);
-}
-
-pub fn rand(buf: &mut [u8]) {
-    unsafe { unwrap!(RAND, "No rand set").rand(buf) }
-}