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prec_kernel_clocks.rs
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prec_kernel_clocks.rs
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#![deny(warnings)]
#![no_main]
#![no_std]
#[macro_use]
mod utilities;
use cortex_m_rt::entry;
use stm32h7xx_hal::rcc::{rec, rec::I2c123ClkSel, ResetEnable};
use stm32h7xx_hal::{pac, prelude::*};
fn enable_fdcan(rec: rec::Fdcan) {
// Enable and set individual kernel clock to PLL1 Q CK
rec.enable().kernel_clk_mux(rec::FdcanClkSel::PLL1_Q);
// rec is dropped here, and can never be changed again
}
#[entry]
fn main() -> ! {
utilities::logger::init();
let dp = pac::Peripherals::take().unwrap();
// Constrain and Freeze power
let pwr = dp.PWR.constrain();
let pwrcfg = example_power!(pwr).freeze();
// Constrain and Freeze clock
let rcc = dp.RCC.constrain();
let mut ccdr = rcc
.sys_ck(100.mhz())
.pll1_q_ck(4.mhz())
.pll3_p_ck(4.mhz())
.pll3_r_ck(4.mhz())
.freeze(pwrcfg, &dp.SYSCFG);
// Set group kernel clock to PLL3 R CK. Needs mutable ccdr
ccdr.peripheral.kernel_i2c123_clk_mux(I2c123ClkSel::PLL3_R);
// (now ccdr can be immutable)
enable_fdcan(ccdr.peripheral.FDCAN);
// Compile error: value used here after move
//ccdr.peripheral.FDCAN.disable();
// Compile error: value borrowed here after partial move
//
// Can't change group clocks - ccdr.peripheral has been partially used
//ccdr.peripheral.kernel_i2c123_clk_mux(I2c123ClkSel::HSI_KER);
loop {
cortex_m::asm::nop()
}
}