51 lines
1.4 KiB
Rust
51 lines
1.4 KiB
Rust
use embassy_hal_common::{into_ref, PeripheralRef};
|
|
|
|
use crate::pac::CRC as PAC_CRC;
|
|
use crate::peripherals::CRC;
|
|
use crate::rcc::sealed::RccPeripheral;
|
|
use crate::Peripheral;
|
|
|
|
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();
|
|
// Reset CRC to default values.
|
|
CRC::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()
|
|
}
|
|
pub fn read(&self) -> u32 {
|
|
PAC_CRC.dr().read()
|
|
}
|
|
}
|