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Remove hard coded clock speed from blink example.

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This commit is contained in:
Jonathan Pallant (42 Technology) 2021-09-27 17:30:06 +01:00
parent 07c183a636
commit d5a07bc398
1 changed files with 5 additions and 6 deletions
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11
rp2040-hal/examples/blinky.rs
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@ -25,8 +25,10 @@ use hal::pac;
// A GPIO trait we need // A GPIO trait we need
use embedded_hal::digital::v2::OutputPin; use embedded_hal::digital::v2::OutputPin;
use embedded_time::fixed_point::FixedPoint;
use rp2040_hal::clocks::Clock;
// The linker will place this boot block at the start of our program image. We /// The linker will place this boot block at the start of our program image. We
// need this to help the ROM bootloader get our code up and running. // need this to help the ROM bootloader get our code up and running.
#[link_section = ".boot2"] #[link_section = ".boot2"]
#[used] #[used]
@ -36,9 +38,6 @@ pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER;
/// if your board has a different frequency /// if your board has a different frequency
const XTAL_FREQ_HZ: u32 = 12_000_000u32; const XTAL_FREQ_HZ: u32 = 12_000_000u32;
/// Run RP2040 at 125 MHz
const SYS_FREQ_HZ: u32 = hal::pll::common_configs::PLL_SYS_125MHZ.vco_freq.0;
/// Entry point to our bare-metal application. /// Entry point to our bare-metal application.
/// ///
/// The `#[entry]` macro ensures the Cortex-M start-up code calls this function /// The `#[entry]` macro ensures the Cortex-M start-up code calls this function
@ -56,7 +55,7 @@ fn main() -> ! {
let mut watchdog = hal::watchdog::Watchdog::new(pac.WATCHDOG); let mut watchdog = hal::watchdog::Watchdog::new(pac.WATCHDOG);
// Configure the clocks // Configure the clocks
let _clocks = hal::clocks::init_clocks_and_plls( let clocks = hal::clocks::init_clocks_and_plls(
XTAL_FREQ_HZ, XTAL_FREQ_HZ,
pac.XOSC, pac.XOSC,
pac.CLOCKS, pac.CLOCKS,
@ -68,7 +67,7 @@ fn main() -> ! {
.ok() .ok()
.unwrap(); .unwrap();
let mut delay = cortex_m::delay::Delay::new(core.SYST, SYS_FREQ_HZ); let mut delay = cortex_m::delay::Delay::new(core.SYST, clocks.system_clock.freq().integer());
// The single-cycle I/O block controls our GPIO pins // The single-cycle I/O block controls our GPIO pins
let sio = hal::sio::Sio::new(pac.SIO); let sio = hal::sio::Sio::new(pac.SIO);