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use crate::pac::CRC as PAC_CRC;
use crate::peripherals::CRC;
use crate::{Peri, rcc};
/// CRC driver.
pub struct Crc<'d> {
_peri: Peri<'d, CRC>,
}
impl<'d> Crc<'d> {
/// Instantiates the CRC32 peripheral and initializes it to default values.
pub fn new(peripheral: Peri<'d, CRC>) -> Self {
// Note: enable and reset come from RccPeripheral.
// enable CRC clock in RCC.
rcc::enable_and_reset::<CRC>();
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 into the CRC peripheral. Returns the computed CRC.
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()
}
/// Feeds a slice of words into the CRC peripheral. Returns the computed CRC.
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()
}
}
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