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Use found divider instead of re-reading brr

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This commit is contained in:
Rasmus Melchior Jacobsen 2023-05-26 23:48:49 +02:00
parent f616b22159
commit cb5df138d6
1 changed files with 7 additions and 7 deletions
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14
embassy-stm32/src/usart/mod.rs
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@ -836,7 +836,7 @@ fn configure(r: Regs, config: &Config, pclk_freq: Hertz, kind: Kind, enable_rx:
#[cfg(not(usart_v1))]
let mut over8 = false;
let mut found = false;
let mut found = None;
for &(presc, _presc_val) in &DIVS {
let denom = (config.baudrate * presc as u32) as u64;
let div = (pclk_freq.0 as u64 * mul + (denom / 2)) / denom;
@ -858,26 +858,26 @@ fn configure(r: Regs, config: &Config, pclk_freq: Hertz, kind: Kind, enable_rx:
#[cfg(usart_v4)]
r.presc().write(|w| w.set_prescaler(_presc_val));
}
found = true;
found = Some(div);
break;
}
panic!("USART: baudrate too high");
}
if div < brr_max {
let div = div as u32;
unsafe {
r.brr().write_value(regs::Brr(div as u32));
r.brr().write_value(regs::Brr(div));
#[cfg(usart_v4)]
r.presc().write(|w| w.set_prescaler(_presc_val));
}
found = true;
found = Some(div);
break;
}
}
assert!(found, "USART: baudrate too low");
let div = found.expect("USART: baudrate too low");
let brr = unsafe { r.brr().read().brr() as u32 };
#[cfg(not(usart_v1))]
let oversampling = if over8 { "8 bit" } else { "16 bit" };
#[cfg(usart_v1)]
@ -886,7 +886,7 @@ fn configure(r: Regs, config: &Config, pclk_freq: Hertz, kind: Kind, enable_rx:
"Using {} oversampling, desired baudrate: {}, actual baudrate: {}",
oversampling,
config.baudrate,
pclk_freq.0 / brr
pclk_freq.0 / div
);
unsafe {