1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52
use embassy_hal_internal::{into_ref, PeripheralRef};
use crate::pac::CRC as PAC_CRC;
use crate::peripherals::CRC;
use crate::rcc::sealed::RccPeripheral;
use crate::Peripheral;
/// CRC driver.
pub struct Crc<'d> {
_peri: PeripheralRef<'d, CRC>,
}
impl<'d> Crc<'d> {
/// Instantiates the CRC32 peripheral and initializes it to default values.
pub fn new(peripheral: impl Peripheral<P = CRC> + 'd) -> Self {
into_ref!(peripheral);
// Note: enable and reset come from RccPeripheral.
// enable CRC clock in RCC.
CRC::enable_and_reset();
// Peripheral the peripheral
let mut instance = Self { _peri: peripheral };
instance.reset();
instance
}
/// Resets the CRC unit to default value (0xFFFF_FFFF)
pub fn reset(&mut self) {
PAC_CRC.cr().write(|w| w.set_reset(true));
}
/// Feeds a word to the peripheral and returns the current CRC value
pub fn feed_word(&mut self, word: u32) -> u32 {
// write a single byte to the device, and return the result
PAC_CRC.dr().write_value(word);
self.read()
}
/// Feed a slice of words to the peripheral and return the result.
pub fn feed_words(&mut self, words: &[u32]) -> u32 {
for word in words {
PAC_CRC.dr().write_value(*word);
}
self.read()
}
/// Read the CRC result value.
pub fn read(&self) -> u32 {
PAC_CRC.dr().read()
}
}