Usb low speed

boards/metro_m0/CHANGELOG.md

@@ -1,5 +1,7 @@
 # Unreleased
 
+- Add `usb_low_speed` usb cfg feature to set USB speed to low speed (1.5Mbps).
+
 # v0.12.1
 
 - Update to `atsamd-hal` version `0.15.1`

boards/metro_m0/Cargo.toml

@@ -42,6 +42,7 @@ rtic = ["atsamd-hal/rtic"]
 unproven = ["atsamd-hal/unproven"]
 use_rtt = ["atsamd-hal/use_rtt"]
 usb = ["atsamd-hal/usb", "usb-device"]
+usb_low_speed = ["atsamd-hal/usb_low_speed"]
 use_semihosting = []
 
 [profile.dev]

hal/CHANGELOG.md

@@ -9,6 +9,7 @@
 - Fix failing `bsp_pins!` invocation with no aliases (#605 fixes #599)
 - Add Advanced Encryption Standard (AES) peripheral support including RustCrypto compatible backend
 - Add embedded-hal `InputPin` trait to EIC pins
+- Add `usb_low_speed` usb cfg feature to set USB speed to low speed (1.5Mbps).
 
 # v0.15.1
 

hal/Cargo.toml

@@ -181,6 +181,7 @@ rtic = ["rtic-monotonic", "fugit"]
 sdmmc = ["embedded-sdmmc"]
 unproven = ["embedded-hal/unproven"]
 usb = ["usb-device"]
+usb_low_speed = []
 use_rtt = ["jlink_rtt"]
 
 #===============================================================================

hal/src/thumbv6m/usb/bus.rs

@@ -645,6 +645,10 @@ impl Inner {
         });
         // full speed
         usb.ctrlb.modify(|_, w| w.spdconf().fs());
+        #[cfg(feature = "usb_low_speed")]
+        {
+            usb.ctrlb.modify(|_, w| w.spdconf().ls());
+        }
 
         usb.ctrla.modify(|_, w| w.enable().set_bit());
         while usb.syncbusy.read().enable().bit_is_set() {}

hal/src/thumbv7em/usb/bus.rs

@@ -589,6 +589,10 @@ impl Inner {
         });
         // full speed
         usb.ctrlb.modify(|_, w| w.spdconf().fs());
+        #[cfg(feature = "usb_low_speed")]
+        {
+            usb.ctrlb.modify(|_, w| w.spdconf().ls());
+        }
 
         usb.ctrla.modify(|_, w| w.enable().set_bit());
         while usb.syncbusy.read().enable().bit_is_set() {}