Merge #1243

1243: RP-PICO UART adding set_baudrate r=Dirbaio a=andres-hurtado-lopez

The following PR attepts to bring fuctionality to allow change od UART baudrate changes during runtime.

Changes where created under `@Dirbaio` supervision and discussed on issue:

[https://github.com/embassy-rs/embassy/issues/1241#issuecomment-1445500175]( https://github.com/embassy-rs/embassy/issues/1241#issuecomment-1445500175)

Co-authored-by: Andres Hurtado Lopez <[email protected]>

1 files changed, 31 insertions, 18 deletions

diff --git a/embassy-rp/src/uart/mod.rs b/embassy-rp/src/uart/mod.rs
index bbbf97c01..42b3671a0 100644
--- a/embassy-rp/src/uart/mod.rs
+++ b/embassy-rp/src/uart/mod.rs
@@ -299,7 +299,7 @@ impl<'d, T: Instance> Uart<'d, T, Async> {
     }
 }
 
-impl<'d, T: Instance, M: Mode> Uart<'d, T, M> {
+impl<'d, T: Instance + 'd, M: Mode> Uart<'d, T, M> {
     fn new_inner(
         _uart: impl Peripheral<P = T> + 'd,
         mut tx: PeripheralRef<'d, AnyPin>,
@@ -350,23 +350,7 @@ impl<'d, T: Instance, M: Mode> Uart<'d, T, M> {
                 pin.pad_ctrl().write(|w| w.set_ie(true));
             }
 
-            let clk_base = crate::clocks::clk_peri_freq();
-
-            let baud_rate_div = (8 * clk_base) / config.baudrate;
-            let mut baud_ibrd = baud_rate_div >> 7;
-            let mut baud_fbrd = ((baud_rate_div & 0x7f) + 1) / 2;
-
-            if baud_ibrd == 0 {
-                baud_ibrd = 1;
-                baud_fbrd = 0;
-            } else if baud_ibrd >= 65535 {
-                baud_ibrd = 65535;
-                baud_fbrd = 0;
-            }
-
-            // Load PL011's baud divisor registers
-            r.uartibrd().write_value(pac::uart::regs::Uartibrd(baud_ibrd));
-            r.uartfbrd().write_value(pac::uart::regs::Uartfbrd(baud_fbrd));
+            Self::set_baudrate_inner(config.baudrate);
 
             let (pen, eps) = match config.parity {
                 Parity::ParityNone => (false, false),
@@ -400,6 +384,35 @@ impl<'d, T: Instance, M: Mode> Uart<'d, T, M> {
             });
         }
     }
+
+    /// sets baudrate on runtime    
+    pub fn set_baudrate(&mut self, baudrate: u32) {
+        Self::set_baudrate_inner(baudrate);
+    }
+
+    fn set_baudrate_inner(baudrate: u32) {
+        let r = T::regs();
+
+        let clk_base = crate::clocks::clk_peri_freq();
+
+        let baud_rate_div = (8 * clk_base) / baudrate;
+        let mut baud_ibrd = baud_rate_div >> 7;
+        let mut baud_fbrd = ((baud_rate_div & 0x7f) + 1) / 2;
+
+        if baud_ibrd == 0 {
+            baud_ibrd = 1;
+            baud_fbrd = 0;
+        } else if baud_ibrd >= 65535 {
+            baud_ibrd = 65535;
+            baud_fbrd = 0;
+        }
+
+        unsafe {
+            // Load PL011's baud divisor registers
+            r.uartibrd().write_value(pac::uart::regs::Uartibrd(baud_ibrd));
+            r.uartfbrd().write_value(pac::uart::regs::Uartfbrd(baud_fbrd));
+        }
+    }
 }
 
 impl<'d, T: Instance, M: Mode> Uart<'d, T, M> {