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RP2040: XOSC delay multiplier

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This commit is contained in:
Michael van Niekerk 2023-08-30 21:42:27 +02:00
parent 5c936d33d4
commit ae174fd0e0
1 changed files with 5 additions and 3 deletions
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8
embassy-rp/src/clocks.rs
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@ -94,6 +94,7 @@ impl ClockConfig {
post_div1: 6,
post_div2: 5,
}),
delay_multiplier: 1
}),
ref_clk: RefClkConfig {
src: RefClkSrc::Xosc,
@ -203,6 +204,7 @@ pub struct XoscConfig {
pub hz: u32,
pub sys_pll: Option<PllConfig>,
pub usb_pll: Option<PllConfig>,
pub delay_multiplier: u32,
}
pub struct PllConfig {
@ -363,7 +365,7 @@ pub(crate) unsafe fn init(config: ClockConfig) {
// start XOSC
// datasheet mentions support for clock inputs into XIN, but doesn't go into
// how this is achieved. pico-sdk doesn't support this at all.
start_xosc(config.hz);
start_xosc(config.hz, config.delay_multiplier);
let pll_sys_freq = match config.sys_pll {
Some(sys_pll_config) => configure_pll(pac::PLL_SYS, config.hz, sys_pll_config),
@ -624,12 +626,12 @@ pub fn clk_rtc_freq() -> u16 {
CLOCKS.rtc.load(Ordering::Relaxed)
}
fn start_xosc(crystal_hz: u32) {
fn start_xosc(crystal_hz: u32, delay_multiplier: u32) {
pac::XOSC
.ctrl()
.write(|w| w.set_freq_range(pac::xosc::vals::CtrlFreqRange::_1_15MHZ));
let startup_delay = ((crystal_hz / 1000) + 128) / 256;
let startup_delay = (((crystal_hz / 1000) + 128) * delay_multiplier) / 256;
pac::XOSC.startup().write(|w| w.set_delay(startup_delay as u16));
pac::XOSC.ctrl().write(|w| {
w.set_freq_range(pac::xosc::vals::CtrlFreqRange::_1_15MHZ);