mirror of
https://github.com/embassy-rs/embassy.git
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stm32/rcc: port F1 to new API.
This commit is contained in:
Dario Nieuwenhuis
parent
739c69bd63
commit
b7c147445a
@ -1,191 +1,257 @@
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use core::convert::TryFrom;
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use crate::pac::flash::vals::Latency;
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use crate::pac::rcc::vals::*;
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use crate::pac::rcc::vals::Pllsrc;
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#[cfg(any(rcc_f1, rcc_f1cl))]
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use crate::pac::rcc::vals::Usbpre;
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pub use crate::pac::rcc::vals::{
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Adcpre as ADCPrescaler, Hpre as AHBPrescaler, Pllmul as PllMul, Pllxtpre as PllPreDiv, Ppre as APBPrescaler,
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Sw as Sysclk,
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};
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use crate::pac::{FLASH, RCC};
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use crate::time::Hertz;
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/// HSI speed
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pub const HSI_FREQ: Hertz = Hertz(8_000_000);
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/// Configuration of the clocks
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///
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#[non_exhaustive]
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#[derive(Default)]
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pub struct Config {
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pub hse: Option<Hertz>,
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#[derive(Clone, Copy, Eq, PartialEq)]
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pub enum HseMode {
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/// crystal/ceramic oscillator (HSEBYP=0)
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Oscillator,
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/// external analog clock (low swing) (HSEBYP=1)
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Bypass,
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}
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pub sys_ck: Option<Hertz>,
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pub hclk: Option<Hertz>,
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pub pclk1: Option<Hertz>,
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pub pclk2: Option<Hertz>,
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pub adcclk: Option<Hertz>,
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pub pllxtpre: bool,
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#[derive(Clone, Copy, Eq, PartialEq)]
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pub struct Hse {
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/// HSE frequency.
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pub freq: Hertz,
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/// HSE mode.
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pub mode: HseMode,
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}
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#[derive(Clone, Copy, Eq, PartialEq)]
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pub enum PllSource {
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HSE,
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HSI,
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}
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#[derive(Clone, Copy)]
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pub struct Pll {
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pub src: PllSource,
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/// PLL pre-divider.
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///
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/// On some F3 chips, this must be 2 if `src == HSI`. Init will panic if this is not the case.
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pub prediv: PllPreDiv,
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/// PLL multiplication factor.
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pub mul: PllMul,
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}
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/// Clocks configutation
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#[non_exhaustive]
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pub struct Config {
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pub hsi: bool,
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pub hse: Option<Hse>,
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pub sys: Sysclk,
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pub pll: Option<Pll>,
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pub ahb_pre: AHBPrescaler,
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pub apb1_pre: APBPrescaler,
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pub apb2_pre: APBPrescaler,
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pub adc_pre: ADCPrescaler,
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pub ls: super::LsConfig,
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}
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pub(crate) unsafe fn init(config: Config) {
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let pllxtpre_div = if config.pllxtpre { 2 } else { 1 };
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let pllsrcclk = config.hse.map(|hse| hse.0 / pllxtpre_div).unwrap_or(HSI_FREQ.0 / 2);
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impl Default for Config {
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fn default() -> Self {
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Self {
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hsi: true,
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hse: None,
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sys: Sysclk::HSI,
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pll: None,
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ahb_pre: AHBPrescaler::DIV1,
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apb1_pre: APBPrescaler::DIV1,
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apb2_pre: APBPrescaler::DIV1,
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ls: Default::default(),
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let sysclk = config.sys_ck.map(|sys| sys.0).unwrap_or(pllsrcclk);
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let pllmul = sysclk / pllsrcclk;
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let (pllmul_bits, real_sysclk) = if pllmul == 1 {
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(None, config.hse.map(|hse| hse.0).unwrap_or(HSI_FREQ.0))
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} else {
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let pllmul = core::cmp::min(core::cmp::max(pllmul, 1), 16);
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(Some(pllmul as u8 - 2), pllsrcclk * pllmul)
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};
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assert!(real_sysclk <= 72_000_000);
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let hpre_bits = config
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.hclk
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.map(|hclk| match real_sysclk / hclk.0 {
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0 => unreachable!(),
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1 => 0b0111,
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2 => 0b1000,
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3..=5 => 0b1001,
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6..=11 => 0b1010,
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12..=39 => 0b1011,
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40..=95 => 0b1100,
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96..=191 => 0b1101,
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192..=383 => 0b1110,
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_ => 0b1111,
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})
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.unwrap_or(0b0111);
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let hclk = if hpre_bits >= 0b1100 {
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real_sysclk / (1 << (hpre_bits - 0b0110))
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} else {
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real_sysclk / (1 << (hpre_bits - 0b0111))
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};
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assert!(hclk <= 72_000_000);
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let ppre1_bits = config
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.pclk1
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.map(|pclk1| match hclk / pclk1.0 {
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0 => unreachable!(),
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1 => 0b011,
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2 => 0b100,
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3..=5 => 0b101,
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6..=11 => 0b110,
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_ => 0b111,
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})
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.unwrap_or(0b011);
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let ppre1 = 1 << (ppre1_bits - 0b011);
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let pclk1 = hclk / u32::try_from(ppre1).unwrap();
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let timer_mul1 = if ppre1 == 1 { 1 } else { 2 };
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assert!(pclk1 <= 36_000_000);
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let ppre2_bits = config
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.pclk2
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.map(|pclk2| match hclk / pclk2.0 {
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0 => unreachable!(),
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1 => 0b011,
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2 => 0b100,
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3..=5 => 0b101,
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6..=11 => 0b110,
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_ => 0b111,
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})
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.unwrap_or(0b011);
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let ppre2 = 1 << (ppre2_bits - 0b011);
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let pclk2 = hclk / u32::try_from(ppre2).unwrap();
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let timer_mul2 = if ppre2 == 1 { 1 } else { 2 };
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assert!(pclk2 <= 72_000_000);
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FLASH.acr().write(|w| {
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w.set_latency(if real_sysclk <= 24_000_000 {
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Latency::WS0
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} else if real_sysclk <= 48_000_000 {
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Latency::WS1
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} else {
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Latency::WS2
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});
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// the prefetch buffer is enabled by default, let's keep it enabled
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w.set_prftbe(true);
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});
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// the USB clock is only valid if an external crystal is used, the PLL is enabled, and the
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// PLL output frequency is a supported one.
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// usbpre == false: divide clock by 1.5, otherwise no division
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#[cfg(not(rcc_f100))]
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let (usbpre, _usbclk_valid) = match (config.hse, pllmul_bits, real_sysclk) {
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(Some(_), Some(_), 72_000_000) => (false, true),
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(Some(_), Some(_), 48_000_000) => (true, true),
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_ => (true, false),
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};
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let apre_bits: u8 = config
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.adcclk
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.map(|adcclk| match pclk2 / adcclk.0 {
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0..=2 => 0b00,
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3..=4 => 0b01,
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5..=7 => 0b10,
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_ => 0b11,
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})
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.unwrap_or(0b11);
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let apre = (apre_bits + 1) << 1;
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let adcclk = pclk2 / unwrap!(u32::try_from(apre));
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assert!(adcclk <= 14_000_000);
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if config.hse.is_some() {
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// enable HSE and wait for it to be ready
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RCC.cr().modify(|w| w.set_hseon(true));
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while !RCC.cr().read().hserdy() {}
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// ensure ADC is not out of range by default even if APB2 is maxxed out (36mhz)
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adc_pre: ADCPrescaler::DIV6,
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}
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}
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}
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if let Some(pllmul_bits) = pllmul_bits {
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let pllctpre_flag: u8 = if config.pllxtpre { 1 } else { 0 };
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RCC.cfgr()
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.modify(|w| w.set_pllxtpre(Pllxtpre::from_bits(pllctpre_flag)));
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/// Initialize and Set the clock frequencies
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pub(crate) unsafe fn init(config: Config) {
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// Configure HSI
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let hsi = match config.hsi {
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false => {
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RCC.cr().modify(|w| w.set_hsion(false));
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None
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}
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true => {
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RCC.cr().modify(|w| w.set_hsion(true));
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while !RCC.cr().read().hsirdy() {}
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Some(HSI_FREQ)
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}
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};
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// Configure HSE
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let hse = match config.hse {
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None => {
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RCC.cr().modify(|w| w.set_hseon(false));
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None
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}
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Some(hse) => {
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match hse.mode {
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HseMode::Bypass => assert!(max::HSE_BYP.contains(&hse.freq)),
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HseMode::Oscillator => assert!(max::HSE_OSC.contains(&hse.freq)),
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}
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RCC.cr().modify(|w| w.set_hsebyp(hse.mode != HseMode::Oscillator));
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RCC.cr().modify(|w| w.set_hseon(true));
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while !RCC.cr().read().hserdy() {}
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Some(hse.freq)
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}
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};
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// Enable PLL
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let pll = config.pll.map(|pll| {
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let (src_val, src_freq) = match pll.src {
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PllSource::HSI => {
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if pll.prediv != PllPreDiv::DIV2 {
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panic!("if PLL source is HSI, PLL prediv must be 2.");
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}
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(Pllsrc::HSI_DIV2, unwrap!(hsi))
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}
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PllSource::HSE => (Pllsrc::HSE_DIV_PREDIV, unwrap!(hse)),
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};
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let in_freq = src_freq / pll.prediv;
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assert!(max::PLL_IN.contains(&in_freq));
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let out_freq = in_freq * pll.mul;
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assert!(max::PLL_OUT.contains(&out_freq));
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// enable PLL and wait for it to be ready
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RCC.cfgr().modify(|w| {
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w.set_pllmul(Pllmul::from_bits(pllmul_bits));
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w.set_pllsrc(Pllsrc::from_bits(config.hse.is_some() as u8));
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w.set_pllmul(pll.mul);
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w.set_pllsrc(src_val);
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w.set_pllxtpre(pll.prediv);
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});
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RCC.cr().modify(|w| w.set_pllon(true));
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while !RCC.cr().read().pllrdy() {}
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}
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// Only needed for stm32f103?
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RCC.cfgr().modify(|w| {
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w.set_adcpre(Adcpre::from_bits(apre_bits));
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w.set_ppre2(Ppre::from_bits(ppre2_bits));
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w.set_ppre1(Ppre::from_bits(ppre1_bits));
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w.set_hpre(Hpre::from_bits(hpre_bits));
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#[cfg(not(rcc_f100))]
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w.set_usbpre(Usbpre::from_bits(usbpre as u8));
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w.set_sw(if pllmul_bits.is_some() {
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Sw::PLL1_P
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} else if config.hse.is_some() {
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Sw::HSE
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} else {
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Sw::HSI
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});
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out_freq
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});
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#[cfg(any(rcc_f1, rcc_f1cl))]
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let usb = match pll {
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Some(Hertz(72_000_000)) => {
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RCC.cfgr().modify(|w| w.set_usbpre(Usbpre::DIV1_5));
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Some(Hertz(48_000_000))
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}
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Some(Hertz(48_000_000)) => {
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RCC.cfgr().modify(|w| w.set_usbpre(Usbpre::DIV1));
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Some(Hertz(48_000_000))
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}
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_ => None,
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};
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// Configure sysclk
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let sys = match config.sys {
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Sysclk::HSI => unwrap!(hsi),
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Sysclk::HSE => unwrap!(hse),
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Sysclk::PLL1_P => unwrap!(pll),
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_ => unreachable!(),
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};
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let hclk = sys / config.ahb_pre;
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let (pclk1, pclk1_tim) = super::util::calc_pclk(hclk, config.apb1_pre);
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let (pclk2, pclk2_tim) = super::util::calc_pclk(hclk, config.apb2_pre);
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assert!(max::HCLK.contains(&hclk));
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assert!(max::PCLK1.contains(&pclk1));
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assert!(max::PCLK2.contains(&pclk2));
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let adc = pclk2 / config.adc_pre;
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assert!(max::ADC.contains(&adc));
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// Set latency based on HCLK frquency
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let latency = match hclk.0 {
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..=24_000_000 => Latency::WS0,
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..=48_000_000 => Latency::WS1,
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_ => Latency::WS2,
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};
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FLASH.acr().modify(|w| {
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w.set_latency(latency);
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// RM0316: "The prefetch buffer must be kept on when using a prescaler
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// different from 1 on the AHB clock.", "Half-cycle access cannot be
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// used when there is a prescaler different from 1 on the AHB clock"
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if config.ahb_pre != AHBPrescaler::DIV1 {
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w.set_hlfcya(false);
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w.set_prftbe(true);
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}
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});
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// Set prescalers
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// CFGR has been written before (PLL, PLL48) don't overwrite these settings
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RCC.cfgr().modify(|w| {
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w.set_ppre1(config.apb1_pre);
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w.set_ppre2(config.apb2_pre);
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w.set_hpre(config.ahb_pre);
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w.set_adcpre(config.adc_pre);
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});
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// Wait for the new prescalers to kick in
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// "The clocks are divided with the new prescaler factor from
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// 1 to 16 AHB cycles after write"
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cortex_m::asm::delay(16);
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// CFGR has been written before (PLL, PLL48, clock divider) don't overwrite these settings
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RCC.cfgr().modify(|w| w.set_sw(config.sys));
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while RCC.cfgr().read().sws() != config.sys {}
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let rtc = config.ls.init();
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set_clocks!(
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sys: Some(Hertz(real_sysclk)),
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pclk1: Some(Hertz(pclk1)),
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pclk2: Some(Hertz(pclk2)),
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pclk1_tim: Some(Hertz(pclk1 * timer_mul1)),
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pclk2_tim: Some(Hertz(pclk2 * timer_mul2)),
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hclk1: Some(Hertz(hclk)),
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adc: Some(Hertz(adcclk)),
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hsi: hsi,
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hse: hse,
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pll1_p: pll,
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sys: Some(sys),
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pclk1: Some(pclk1),
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pclk2: Some(pclk2),
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pclk1_tim: Some(pclk1_tim),
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pclk2_tim: Some(pclk2_tim),
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hclk1: Some(hclk),
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adc: Some(adc),
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rtc: rtc,
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#[cfg(any(rcc_f1, rcc_f1cl))]
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usb: usb,
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lse: None,
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);
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}
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mod max {
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use core::ops::RangeInclusive;
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use crate::time::Hertz;
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#[cfg(not(rcc_f1cl))]
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pub(crate) const HSE_OSC: RangeInclusive<Hertz> = Hertz(4_000_000)..=Hertz(16_000_000);
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#[cfg(not(rcc_f1cl))]
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pub(crate) const HSE_BYP: RangeInclusive<Hertz> = Hertz(1_000_000)..=Hertz(25_000_000);
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#[cfg(rcc_f1cl)]
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pub(crate) const HSE_OSC: RangeInclusive<Hertz> = Hertz(3_000_000)..=Hertz(25_000_000);
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#[cfg(rcc_f1cl)]
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pub(crate) const HSE_BYP: RangeInclusive<Hertz> = Hertz(1_000_000)..=Hertz(50_000_000);
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pub(crate) const HCLK: RangeInclusive<Hertz> = Hertz(0)..=Hertz(72_000_000);
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pub(crate) const PCLK1: RangeInclusive<Hertz> = Hertz(0)..=Hertz(36_000_000);
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pub(crate) const PCLK2: RangeInclusive<Hertz> = Hertz(0)..=Hertz(72_000_000);
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pub(crate) const PLL_IN: RangeInclusive<Hertz> = Hertz(1_000_000)..=Hertz(25_000_000);
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pub(crate) const PLL_OUT: RangeInclusive<Hertz> = Hertz(16_000_000)..=Hertz(72_000_000);
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pub(crate) const ADC: RangeInclusive<Hertz> = Hertz(0)..=Hertz(14_000_000);
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}
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@ -3,15 +3,13 @@
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use defmt::info;
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use embassy_executor::Spawner;
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use embassy_stm32::time::Hertz;
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use embassy_stm32::Config;
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use embassy_time::Timer;
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use {defmt_rtt as _, panic_probe as _};
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) -> ! {
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let mut config = Config::default();
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config.rcc.sys_ck = Some(Hertz(36_000_000));
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let config = Config::default();
|
||||
let _p = embassy_stm32::init(config);
|
||||
|
||||
loop {
|
||||
|
||||
@ -21,9 +21,23 @@ bind_interrupts!(struct Irqs {
|
||||
#[embassy_executor::main]
|
||||
async fn main(_spawner: Spawner) {
|
||||
let mut config = Config::default();
|
||||
config.rcc.hse = Some(Hertz(8_000_000));
|
||||
config.rcc.sys_ck = Some(Hertz(48_000_000));
|
||||
config.rcc.pclk1 = Some(Hertz(24_000_000));
|
||||
{
|
||||
use embassy_stm32::rcc::*;
|
||||
config.rcc.hse = Some(Hse {
|
||||
freq: Hertz(8_000_000),
|
||||
// Oscillator for bluepill, Bypass for nucleos.
|
||||
mode: HseMode::Oscillator,
|
||||
});
|
||||
config.rcc.pll = Some(Pll {
|
||||
src: PllSource::HSE,
|
||||
prediv: PllPreDiv::DIV1,
|
||||
mul: PllMul::MUL9,
|
||||
});
|
||||
config.rcc.sys = Sysclk::PLL1_P;
|
||||
config.rcc.ahb_pre = AHBPrescaler::DIV1;
|
||||
config.rcc.apb1_pre = APBPrescaler::DIV2;
|
||||
config.rcc.apb2_pre = APBPrescaler::DIV1;
|
||||
}
|
||||
let mut p = embassy_stm32::init(config);
|
||||
|
||||
info!("Hello World!");
|
||||
|
||||
@ -14,9 +14,9 @@ rustflags = [
|
||||
]
|
||||
|
||||
[build]
|
||||
target = "thumbv6m-none-eabi"
|
||||
#target = "thumbv6m-none-eabi"
|
||||
#target = "thumbv7m-none-eabi"
|
||||
#target = "thumbv7em-none-eabi"
|
||||
target = "thumbv7em-none-eabi"
|
||||
#target = "thumbv8m.main-none-eabihf"
|
||||
|
||||
[env]
|
||||
|
||||
@ -247,6 +247,24 @@ pub fn config() -> Config {
|
||||
config.rcc = embassy_stm32::rcc::WPAN_DEFAULT;
|
||||
}
|
||||
|
||||
#[cfg(feature = "stm32f103c8")]
|
||||
{
|
||||
use embassy_stm32::rcc::*;
|
||||
config.rcc.hse = Some(Hse {
|
||||
freq: Hertz(8_000_000),
|
||||
mode: HseMode::Oscillator,
|
||||
});
|
||||
config.rcc.pll = Some(Pll {
|
||||
src: PllSource::HSE,
|
||||
prediv: PllPreDiv::DIV1,
|
||||
mul: PllMul::MUL9,
|
||||
});
|
||||
config.rcc.sys = Sysclk::PLL1_P;
|
||||
config.rcc.ahb_pre = AHBPrescaler::DIV1;
|
||||
config.rcc.apb1_pre = APBPrescaler::DIV2;
|
||||
config.rcc.apb2_pre = APBPrescaler::DIV1;
|
||||
}
|
||||
|
||||
#[cfg(feature = "stm32f207zg")]
|
||||
{
|
||||
use embassy_stm32::rcc::*;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user