ace679f13b
* Add support for building a package without its default features to `xtask` * Do not require `embedded_hal_02` traits in examples where they are not required * Do not require `embedded_hal_02` traits for filling a buffer with random bytes
96 lines
2.7 KiB
Rust
96 lines
2.7 KiB
Rust
//! This shows example usage of the CRC functions in ROM
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//% CHIPS: esp32 esp32c2 esp32c3 esp32c6 esp32h2 esp32s2 esp32s3
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#![no_std]
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#![no_main]
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use core::fmt::Write;
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use esp_backtrace as _;
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use esp_hal::{
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clock::ClockControl,
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delay::Delay,
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peripherals::Peripherals,
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prelude::*,
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rom::{crc, md5},
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uart::Uart,
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};
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#[entry]
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fn main() -> ! {
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let peripherals = Peripherals::take();
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let system = peripherals.SYSTEM.split();
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let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
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let delay = Delay::new(&clocks);
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let mut uart0 = Uart::new(peripherals.UART0, &clocks);
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let data = "123456789";
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let sentence = "The quick brown fox jumps over a lazy dog";
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writeln!(
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uart0,
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"Performing CRC calculations on test string \"{data}\""
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)
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.unwrap();
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loop {
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let crc_hdlc = crc::crc32_le(!0xffffffff, data.as_ref());
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let crc_bzip2 = crc::crc32_be(!0xffffffff, data.as_ref());
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let crc_mpeg2 = !crc::crc32_be(!0xffffffff, data.as_ref());
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let crc_cksum = crc::crc32_be(!0, data.as_ref());
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let crc_kermit = !crc::crc16_le(!0, data.as_ref());
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let crc_genibus = crc::crc16_be(!0xffff, data.as_ref());
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let crc_rohc = !crc::crc8_le(!0xff, data.as_ref());
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let crc_smbus = !crc::crc8_be(!0, data.as_ref());
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assert_eq!(crc_hdlc, 0xcbf43926);
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assert_eq!(crc_bzip2, 0xfc891918);
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assert_eq!(crc_mpeg2, 0x0376e6e7);
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assert_eq!(crc_cksum, 0x765e7680);
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assert_eq!(crc_kermit, 0x2189);
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assert_eq!(crc_genibus, 0xd64e);
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assert_eq!(crc_rohc, 0xd0);
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assert_eq!(crc_smbus, 0xf4);
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// Hash the sentence one word at a time to *really* test the context
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// Use Peekable while iter_intersperse is unstable
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let mut md5_ctx = md5::Context::new();
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let mut it = sentence.split_whitespace().peekable();
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while let Some(word) = it.next() {
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md5_ctx.consume(word);
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if it.peek().is_some() {
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md5_ctx.consume(" ");
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}
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}
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let md5_digest = md5_ctx.compute();
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assert_eq!(
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md5_digest,
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md5::Digest([
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0x30, 0xde, 0xd8, 0x07, 0xd6, 0x5e, 0xe0, 0x37, 0x0f, 0xc6, 0xd7, 0x3d, 0x6a, 0xb5,
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0x5a, 0x95
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])
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);
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writeln!(
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uart0,
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"{:08x} {:08x} {:08x} {:08x} {:04x} {:04x} {:02x} {:02x} {}",
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crc_hdlc,
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crc_bzip2,
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crc_mpeg2,
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crc_cksum,
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crc_kermit,
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crc_genibus,
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crc_rohc,
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crc_smbus,
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md5_digest
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)
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.unwrap();
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delay.delay(1.secs());
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}
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}
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