Robin Mueller
f3d71cf0f9
- Clock module to set and retrieve system clock which can have varying frequencies. Also allows enabling peripheral clocks - Prelude updated - Common time types added, based on stm32f1xx HAL implementation - Basic timer implementation added
49 lines
1.3 KiB
Rust
49 lines
1.3 KiB
Rust
use crate::time::Hertz;
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use cortex_m::interrupt::{self, Mutex};
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use once_cell::unsync::OnceCell;
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use va108xx::SYSCONFIG;
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static SYS_CLOCK: Mutex<OnceCell<Hertz>> = Mutex::new(OnceCell::new());
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pub enum PeripheralClocks {
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PortA = 0,
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PortB = 1,
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Spi0 = 4,
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Spi1 = 5,
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Spi2 = 6,
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UArt0 = 8,
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Uart1 = 9,
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I2c0 = 16,
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I2c1 = 17,
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Irqsel = 21,
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Ioconfig = 22,
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Utility = 23,
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Gpio = 24,
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}
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/// The Vorago in powered by an external clock which might have different frequencies.
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/// The clock can be set here so it can be used by other software components as well.
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/// The clock can be set exactly once
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pub fn set_sys_clock(freq: Hertz) {
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interrupt::free(|cs| {
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SYS_CLOCK.borrow(cs).set(freq).ok();
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})
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}
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/// Returns the configured system clock
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pub fn get_sys_clock() -> Option<Hertz> {
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interrupt::free(|cs| SYS_CLOCK.borrow(cs).get().copied())
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}
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pub fn enable_peripheral_clock(syscfg: &mut SYSCONFIG, clock: PeripheralClocks) {
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syscfg
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.peripheral_clk_enable
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.modify(|r, w| unsafe { w.bits(r.bits() | (1 << clock as u8)) });
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}
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pub fn disable_peripheral_clock(syscfg: &mut SYSCONFIG, clock: PeripheralClocks) {
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syscfg
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.peripheral_clk_enable
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.modify(|r, w| unsafe { w.bits(r.bits() & !(1 << clock as u8)) });
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}
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