59 lines
1.6 KiB
Rust
59 lines
1.6 KiB
Rust
use crate::pac::CRC as PAC_CRC;
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use crate::peripherals::CRC;
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use crate::{rcc, Peri};
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/// CRC driver.
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pub struct Crc<'d> {
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_peri: Peri<'d, 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: Peri<'d, CRC>) -> 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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rcc::enable_and_reset::<CRC>();
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let mut instance = Self { _peri: peripheral };
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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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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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#[cfg(not(crc_v1))]
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PAC_CRC.dr32().write_value(word);
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#[cfg(crc_v1)]
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PAC_CRC.dr().write_value(word);
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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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#[cfg(not(crc_v1))]
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PAC_CRC.dr32().write_value(*word);
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#[cfg(crc_v1)]
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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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/// Read the CRC result value.
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#[cfg(not(crc_v1))]
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pub fn read(&self) -> u32 {
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PAC_CRC.dr32().read()
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}
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/// Read the CRC result value.
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#[cfg(crc_v1)]
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pub fn read(&self) -> u32 {
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PAC_CRC.dr().read()
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}
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}
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