Peripheral ref/sha (#312)

* Add SHA to list of peripherals to be created

* Refactor SHA peripheral to use PeripheralRef

* Update SHA examples to get them building again

Author: jessebraham

esp-hal-common/src/peripherals/esp32.rs

@@ -55,6 +55,7 @@ mod peripherals {
         I2C0,
         I2C1,
         RNG,
+        SHA,
         SPI0,
         SPI1,
         SPI2,

esp-hal-common/src/peripherals/esp32c2.rs

@@ -36,6 +36,7 @@ mod peripherals {
     crate::create_peripherals! {
         I2C0,
         RNG,
+        SHA,
         SPI0,
         SPI1,
         SPI2,

esp-hal-common/src/peripherals/esp32c3.rs

@@ -47,6 +47,7 @@ mod peripherals {
     crate::create_peripherals! {
         I2C0,
         RNG,
+        SHA,
         SPI0,
         SPI1,
         SPI2,

esp-hal-common/src/peripherals/esp32s2.rs

@@ -53,6 +53,7 @@ mod peripherals {
         I2C0,
         I2C1,
         RNG,
+        SHA,
         SPI0,
         SPI1,
         SPI2,

esp-hal-common/src/peripherals/esp32s3.rs

@@ -64,6 +64,7 @@ mod peripherals {
         I2C0,
         I2C1,
         RNG,
+        SHA,
         SPI0,
         SPI1,
         SPI2,

esp-hal-common/src/sha.rs

@@ -1,6 +1,9 @@
 use core::convert::Infallible;
 
-use crate::pac::SHA;
+use crate::{
+    peripheral::{Peripheral, PeripheralRef},
+    peripherals::SHA,
+};
 
 // All the hash algorithms introduced in FIPS PUB 180-4 Spec.
 // – SHA-1
@@ -157,9 +160,8 @@ impl AlignmentHelper {
     }
 }
 
-#[derive(Debug)]
-pub struct Sha {
-    sha: SHA,
+pub struct Sha<'d> {
+    sha: PeripheralRef<'d, SHA>,
     mode: ShaMode,
     alignment_helper: AlignmentHelper,
     cursor: usize,
@@ -224,8 +226,10 @@ fn mode_as_bits(mode: ShaMode) -> u8 {
 
 // This implementation might fail after u32::MAX/8 bytes, to increase please see
 // ::finish() length/self.cursor usage
-impl Sha {
-    pub fn new(sha: SHA, mode: ShaMode) -> Self {
+impl<'d> Sha<'d> {
+    pub fn new(sha: impl Peripheral<P = SHA> + 'd, mode: ShaMode) -> Self {
+        crate::into_ref!(sha);
+
         // Setup SHA Mode
         #[cfg(not(esp32))]
         sha.mode
@@ -508,8 +512,4 @@ impl Sha {
 
         Ok(())
     }
-
-    pub fn free(self) -> SHA {
-        self.sha
-    }
 }

esp32-hal/examples/sha.rs

@@ -66,7 +66,6 @@ fn main() -> ! {
     let hw_time = post_calc - pre_calc;
     println!("Took {} cycles", hw_time);
     println!("SHA512 Hash output {:02x?}", output);
-    let _usha = hasher.free();
 
     let pre_calc = xtensa_lx::timer::get_cycle_count();
     let mut hasher = Sha512::new();

esp32c2-hal/examples/sha.rs

@@ -65,7 +65,6 @@ fn main() -> ! {
     // let hw_time = post_calc - pre_calc;
     // println!("Took {} cycles", hw_time);
     println!("SHA256 Hash output {:02x?}", output);
-    let _usha = hasher.free();
 
     // let pre_calc = xtensa_lx::timer::get_cycle_count();
     let mut hasher = Sha256::new();

esp32c3-hal/examples/sha.rs

@@ -65,7 +65,6 @@ fn main() -> ! {
     // let hw_time = post_calc - pre_calc;
     // println!("Took {} cycles", hw_time);
     println!("SHA256 Hash output {:02x?}", output);
-    let _usha = hasher.free();
 
     // let pre_calc = xtensa_lx::timer::get_cycle_count();
     let mut hasher = Sha256::new();

esp32s2-hal/examples/sha.rs

@@ -65,7 +65,6 @@ fn main() -> ! {
     let hw_time = post_calc - pre_calc;
     println!("Took {} cycles", hw_time);
     println!("SHA512 Hash output {:02x?}", output);
-    let _usha = hasher.free();
 
     let pre_calc = xtensa_lx::timer::get_cycle_count();
     let mut hasher = Sha512::new();