57 lines
1.6 KiB
Rust
57 lines
1.6 KiB
Rust
use core::marker::PhantomData;
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use crate::pac::CRC as PAC_CRC;
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use crate::peripherals::CRC;
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use crate::rcc::sealed::RccPeripheral;
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use embassy::util::Unborrow;
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use embassy_hal_common::unborrow;
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pub struct Crc<'d> {
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_peripheral: CRC,
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_phantom: PhantomData<&'d mut CRC>,
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}
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impl<'d> Crc<'d> {
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/// Instantiates the CRC32 peripheral and initializes it to default values.
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pub fn new(peripheral: impl Unborrow<Target = CRC> + 'd) -> Self {
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// Note: enable and reset come from RccPeripheral.
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// enable CRC clock in RCC.
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CRC::enable();
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// Reset CRC to default values.
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CRC::reset();
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// Unborrow the peripheral
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unborrow!(peripheral);
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let mut instance = Self {
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_peripheral: peripheral,
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_phantom: PhantomData,
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};
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instance.reset();
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instance
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}
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/// Resets the CRC unit to default value (0xFFFF_FFFF)
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pub fn reset(&mut self) {
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unsafe { PAC_CRC.cr().write(|w| w.set_reset(true)) };
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}
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/// Feeds a word to the peripheral and returns the current CRC value
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pub fn feed_word(&mut self, word: u32) -> u32 {
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// write a single byte to the device, and return the result
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unsafe {
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PAC_CRC.dr().write_value(word);
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}
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self.read()
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}
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/// Feed a slice of words to the peripheral and return the result.
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pub fn feed_words(&mut self, words: &[u32]) -> u32 {
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for word in words {
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unsafe { PAC_CRC.dr().write_value(*word) }
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}
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self.read()
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}
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pub fn read(&self) -> u32 {
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unsafe { PAC_CRC.dr().read() }
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}
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}
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