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RP-PICO UART adding set_baudrate: refactoring of methods

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This commit is contained in:
Andres Hurtado Lopez 2023-02-26 19:14:25 -05:00
parent 8fb380b180
commit 7172dfd083
1 changed files with 23 additions and 28 deletions
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51
embassy-rp/src/uart/mod.rs
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@ -324,25 +324,6 @@ impl<'d, T: Instance, M: Mode> Uart<'d, T, M> {
} }
} }
fn baudrate_calculations(baudrate: u32) -> (u32, u32) {
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;
}
(baud_ibrd, baud_fbrd)
}
fn init( fn init(
tx: Option<PeripheralRef<'_, AnyPin>>, tx: Option<PeripheralRef<'_, AnyPin>>,
rx: Option<PeripheralRef<'_, AnyPin>>, rx: Option<PeripheralRef<'_, AnyPin>>,
@ -369,11 +350,7 @@ impl<'d, T: Instance, M: Mode> Uart<'d, T, M> {
pin.pad_ctrl().write(|w| w.set_ie(true)); pin.pad_ctrl().write(|w| w.set_ie(true));
} }
let (baud_ibrd, baud_fbrd) = Uart::<T,M>::baudrate_calculations(config.baudrate); Uart::<T,M>::set_baudrate_inner(config.baudrate);
// 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));
let (pen, eps) = match config.parity { let (pen, eps) = match config.parity {
Parity::ParityNone => (false, false), Parity::ParityNone => (false, false),
@ -408,20 +385,38 @@ impl<'d, T: Instance, M: Mode> Uart<'d, T, M> {
} }
} }
/// sets baudrate on runtime
pub fn set_baudrate(&mut self, baudrate: u32) { pub fn set_baudrate(&mut self, baudrate: u32) {
Self::set_baudrate_inner(baudrate);
}
fn set_baudrate_inner(baudrate: u32) {
let r = T::regs(); let r = T::regs();
let (baud_ibrd, baud_fbrd) = Self::baudrate_calculations(baudrate); 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 { unsafe {
// Load PL011's baud divisor registers // Load PL011's baud divisor registers
r.uartibrd().write_value(pac::uart::regs::Uartibrd(baud_ibrd)); r.uartibrd().write_value(pac::uart::regs::Uartibrd(baud_ibrd));
r.uartfbrd().write_value(pac::uart::regs::Uartfbrd(baud_fbrd)); r.uartfbrd().write_value(pac::uart::regs::Uartfbrd(baud_fbrd));
} }
} }
} }
impl<'d, T: Instance, M: Mode> Uart<'d, T, M> { impl<'d, T: Instance, M: Mode> Uart<'d, T, M> {