From d4c378e059443dbaaaece02a0f5148db62bd4484 Mon Sep 17 00:00:00 2001
From: Felipe Balbi <febalbi@microsoft.com>
Date: Fri, 11 Apr 2025 14:28:59 -0700
Subject: Add embassy-imxrt CRC driver

---
 examples/mimxrt6/src/bin/crc.rs | 175 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 175 insertions(+)
 create mode 100644 examples/mimxrt6/src/bin/crc.rs

(limited to 'examples/mimxrt6/src')

diff --git a/examples/mimxrt6/src/bin/crc.rs b/examples/mimxrt6/src/bin/crc.rs
new file mode 100644
index 000000000..005a250e5
--- /dev/null
+++ b/examples/mimxrt6/src/bin/crc.rs
@@ -0,0 +1,175 @@
+#![no_std]
+#![no_main]
+
+extern crate embassy_imxrt_examples;
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_imxrt::crc::{Config, Crc, Polynomial};
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let mut p = embassy_imxrt::init(Default::default());
+    let data = b"123456789";
+
+    info!("Initializing CRC");
+
+    // CRC-CCITT
+    let mut crc = Crc::new(p.CRC.reborrow(), Default::default());
+    let output = crc.feed_bytes(data);
+    defmt::assert_eq!(output, 0x29b1);
+
+    // CRC16-ARC
+    let mut crc = Crc::new(
+        p.CRC.reborrow(),
+        Config {
+            polynomial: Polynomial::Crc16,
+            reverse_in: true,
+            reverse_out: true,
+            complement_out: false,
+            seed: 0,
+            ..Default::default()
+        },
+    );
+    let output = crc.feed_bytes(data);
+    defmt::assert_eq!(output, 0xbb3d);
+
+    // CRC16-CMS
+    let mut crc = Crc::new(
+        p.CRC.reborrow(),
+        Config {
+            polynomial: Polynomial::Crc16,
+            reverse_in: false,
+            reverse_out: false,
+            complement_out: false,
+            seed: 0xffff,
+            ..Default::default()
+        },
+    );
+    let output = crc.feed_bytes(data);
+    defmt::assert_eq!(output, 0xaee7);
+
+    // CRC16-DDS-110
+    let mut crc = Crc::new(
+        p.CRC.reborrow(),
+        Config {
+            polynomial: Polynomial::Crc16,
+            reverse_in: false,
+            reverse_out: false,
+            complement_out: false,
+            seed: 0x800d,
+            ..Default::default()
+        },
+    );
+    let output = crc.feed_bytes(data);
+    defmt::assert_eq!(output, 0x9ecf);
+
+    // CRC16-MAXIM-DOW
+    let mut crc = Crc::new(
+        p.CRC.reborrow(),
+        Config {
+            polynomial: Polynomial::Crc16,
+            reverse_in: true,
+            reverse_out: true,
+            complement_out: true,
+            seed: 0,
+            ..Default::default()
+        },
+    );
+    let output = crc.feed_bytes(data);
+    defmt::assert_eq!(output, 0x44c2);
+
+    // CRC16-MODBUS
+    let mut crc = Crc::new(
+        p.CRC.reborrow(),
+        Config {
+            polynomial: Polynomial::Crc16,
+            reverse_in: true,
+            reverse_out: true,
+            complement_out: false,
+            seed: 0xffff,
+            ..Default::default()
+        },
+    );
+    let output = crc.feed_bytes(data);
+    defmt::assert_eq!(output, 0x4b37);
+
+    // CRC32-BZIP2
+    let mut crc = Crc::new(
+        p.CRC.reborrow(),
+        Config {
+            polynomial: Polynomial::Crc32,
+            reverse_in: false,
+            reverse_out: false,
+            complement_out: true,
+            seed: 0xffff_ffff,
+            ..Default::default()
+        },
+    );
+    let output = crc.feed_bytes(data);
+    defmt::assert_eq!(output, 0xfc89_1918);
+
+    // CRC32-CKSUM
+    let mut crc = Crc::new(
+        p.CRC.reborrow(),
+        Config {
+            polynomial: Polynomial::Crc32,
+            reverse_in: false,
+            reverse_out: false,
+            complement_out: true,
+            seed: 0,
+            ..Default::default()
+        },
+    );
+    let output = crc.feed_bytes(data);
+    defmt::assert_eq!(output, 0x765e_7680);
+
+    // CRC32-ISO-HDLC
+    let mut crc = Crc::new(
+        p.CRC.reborrow(),
+        Config {
+            polynomial: Polynomial::Crc32,
+            reverse_in: true,
+            reverse_out: true,
+            complement_out: true,
+            seed: 0xffff_ffff,
+            ..Default::default()
+        },
+    );
+    let output = crc.feed_bytes(data);
+    defmt::assert_eq!(output, 0xcbf4_3926);
+
+    // CRC32-JAMCRC
+    let mut crc = Crc::new(
+        p.CRC.reborrow(),
+        Config {
+            polynomial: Polynomial::Crc32,
+            reverse_in: true,
+            reverse_out: true,
+            complement_out: false,
+            seed: 0xffff_ffff,
+            ..Default::default()
+        },
+    );
+    let output = crc.feed_bytes(data);
+    defmt::assert_eq!(output, 0x340b_c6d9);
+
+    // CRC32-MPEG-2
+    let mut crc = Crc::new(
+        p.CRC.reborrow(),
+        Config {
+            polynomial: Polynomial::Crc32,
+            reverse_in: false,
+            reverse_out: false,
+            complement_out: false,
+            seed: 0xffff_ffff,
+            ..Default::default()
+        },
+    );
+    let output = crc.feed_bytes(data);
+    defmt::assert_eq!(output, 0x0376_e6e7);
+
+    info!("end program");
+    cortex_m::asm::bkpt();
+}
-- 
cgit