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unsafe and safe enable/disable

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Mirabellensaft 2023-03-10 15:44:41 +01:00
parent 660647219a
commit 8518686e9a
1 changed files with 25 additions and 14 deletions
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31
down-the-stack/apps/src/bin/uarte_enable.rs
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@ -3,36 +3,47 @@
use cortex_m::asm; use cortex_m::asm;
use cortex_m_rt::entry; use cortex_m_rt::entry;
use dk_pac; use dk_pac::UARTE0;
// this imports `down-the-stack/apps/lib.rs` to retrieve our global logger + panicking-behavior // this imports `down-the-stack/apps/lib.rs` to retrieve our global logger + panicking-behavior
use apps as _; use apps as _;
use defmt; use defmt;
use defmt_rtt as _; // global logger use defmt_rtt as _; // global logger
#[entry] #[entry]
fn main() -> ! { fn main() -> ! {
// to enable more verbose logs, go to your `Cargo.toml` and set defmt logging levels // to enable more verbose logs, go to your `Cargo.toml` and set defmt logging levels
// to `defmt-trace` by changing the `default = []` entry in `[features]` // to `defmt-trace` by changing the `default = []` entry in `[features]`
unsafe {
let periph = dk_pac::Peripherals::steal(); // takes ownership of the nRF52840-DK peripherals
let periph = dk_pac::Peripherals::take().unwrap();
let uarte = periph.UARTE0; let uarte = periph.UARTE0;
uarte_enabled(&uarte);
// enable the UART0 peripheral the safe way
uarte.enable.write(|w| w.enable().enabled()); uarte.enable.write(|w| w.enable().enabled());
if uarte.enable.read().bits() != 0 { uarte_enabled(&uarte);
defmt::println!("Uarte0 is enabled");
} else {
defmt::println!("Uarte0 is disabled");
}
// disable the UART0 peripheral by writing 0 directly into the register -- the unsafe way
unsafe {
uarte.enable.write(|w| w.bits(0x00 as u32));
} }
uarte_enabled(&uarte);
// this program does not `exit`; use Ctrl+C to terminate it // this program does not `exit`; use Ctrl+C to terminate it
loop { loop {
asm::nop(); asm::nop();
} }
} }
// Reads the bits in the UART0 register and prints `enabled` or `disabled`
fn uarte_enabled(uarte: &UARTE0) {
if uarte.enable.read().bits() != 0 {
defmt::println!("Uarte0 is enabled");
} else {
defmt::println!("Uarte0 is disabled");
}
}