configure & lock TIMER0's source to CLK_SYS when timer-src-clk-sys feature is selected

Author: U007D

embassy-rp/src/time_driver.rs

@@ -10,6 +10,8 @@ use embassy_time_queue_utils::Queue;
 use pac::TIMER;
 #[cfg(feature = "_rp235x")]
 use pac::TIMER0 as TIMER;
+#[cfg(all(feature = "_rp235x", feature = "timer-src-clk-sys"))]
+use rp_pac::timer::vals::ClkSys;
 
 use crate::interrupt::InterruptExt;
 use crate::{interrupt, pac};
@@ -131,8 +133,9 @@ pub unsafe fn init() {
     }
     #[cfg(all(feature = "_rp235x", feature = "timer-src-clk-sys"))]
     {
-        // The PAC currently only defines `TIMER0` even though the RP2350 also has a `TIMER1`.
-        let timer_0 = TIMER0;
+        // The PAC currently only defines `TIMER0` as `TIMER` even though the RP2350 also has
+        // `TIMER1`.
+        let timer_0 = TIMER;
         // Switch `SOURCE` to `CLK_SYS` (instead of 1 µs tick)
         timer_0.source().write(|w| w.set_clk_sys(ClkSys::CLK_SYS));
         // Lock configuration--`TIMER0` now read-only (until reset)