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Added Vcore boost mode and Flash wait state

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This commit is contained in:
Carl St-Laurent 2023-06-04 11:57:42 -04:00
parent e83762e979
commit ade46489f1
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GPG Key ID: 88D67D5DC9A6996D
2 changed files with 37 additions and 2 deletions
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35
embassy-stm32/src/rcc/g4.rs
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@ -1,4 +1,6 @@
use stm32_metapac::flash::vals::Latency;
use stm32_metapac::rcc::vals::{Hpre, Pllsrc, Ppre, Sw}; use stm32_metapac::rcc::vals::{Hpre, Pllsrc, Ppre, Sw};
use stm32_metapac::FLASH;
use crate::pac::{PWR, RCC}; use crate::pac::{PWR, RCC};
use crate::rcc::{set_freqs, Clocks}; use crate::rcc::{set_freqs, Clocks};
@ -283,6 +285,39 @@ pub(crate) unsafe fn init(config: Config) {
let freq = src_freq / prediv.to_div() * mul.to_mul() / div.to_div(); let freq = src_freq / prediv.to_div() * mul.to_mul() / div.to_div();
assert!(freq <= 170_000_000); assert!(freq <= 170_000_000);
if freq >= 150_000_000 {
// Enable Core Boost mode ([RM0440] p234)
PWR.cr5()
.modify(|w: &mut stm32_metapac::pwr::regs::Cr5| w.set_r1mode(false));
// Set flash wait state in boost mode based on frequency ([RM0440] p191)
if freq <= 36_000_000 {
FLASH.acr().modify(|w| w.set_latency(Latency::WS0));
} else if freq <= 68_000_000 {
FLASH.acr().modify(|w| w.set_latency(Latency::WS1));
} else if freq <= 102_000_000 {
FLASH.acr().modify(|w| w.set_latency(Latency::WS2));
} else if freq <= 136_000_000 {
FLASH.acr().modify(|w| w.set_latency(Latency::WS3));
} else {
FLASH.acr().modify(|w| w.set_latency(Latency::WS4));
}
} else {
PWR.cr5()
.modify(|w: &mut stm32_metapac::pwr::regs::Cr5| w.set_r1mode(true));
// Set flash wait state in normal mode based on frequency ([RM0440] p191)
if freq <= 30_000_000 {
FLASH.acr().modify(|w| w.set_latency(Latency::WS0));
} else if freq <= 60_000_000 {
FLASH.acr().modify(|w| w.set_latency(Latency::WS1));
} else if freq <= 80_000_000 {
FLASH.acr().modify(|w| w.set_latency(Latency::WS2));
} else if freq <= 120_000_000 {
FLASH.acr().modify(|w| w.set_latency(Latency::WS3));
} else {
FLASH.acr().modify(|w| w.set_latency(Latency::WS4));
}
}
RCC.pllcfgr().write(move |w| { RCC.pllcfgr().write(move |w| {
w.set_plln(mul.into()); w.set_plln(mul.into());
w.set_pllm(prediv.into()); w.set_pllm(prediv.into());

4
examples/stm32g4/src/bin/pll.rs
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@ -13,8 +13,8 @@ use {defmt_rtt as _, panic_probe as _};
async fn main(_spawner: Spawner) { async fn main(_spawner: Spawner) {
let mut config = Config::default(); let mut config = Config::default();
// Configure PLL to 128Mhz frequency // Configure PLL to max frequency of 170 MHz
config.rcc.mux = ClockSrc::PLL(PllSrc::HSI16, PllM::Div4, PllN::Mul64, PllClkDiv::Div2); config.rcc.mux = ClockSrc::PLL(PllSrc::HSI16, PllM::Div4, PllN::Mul85, PllClkDiv::Div2);
let _p = embassy_stm32::init(config); let _p = embassy_stm32::init(config);
info!("Hello World!"); info!("Hello World!");