Test the usage of the module DS3231

Cargo.lock

@@ -12,7 +12,7 @@ dependencies = [
  "avr-hal-generic",
  "cfg-if 1.0.0",
  "embedded-hal",
- "ufmt",
+ "ufmt 0.1.2",
  "void",
 ]
 
@@ -25,6 +25,12 @@ dependencies = [
  "avr-hal-generic",
 ]
 
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
 [[package]]
 name = "avr-device"
 version = "0.5.0"
@@ -60,7 +66,7 @@ dependencies = [
  "nb 0.1.3",
  "paste",
  "rustversion",
- "ufmt",
+ "ufmt 0.1.2",
  "void",
 ]
 
@@ -88,6 +94,26 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "chrono"
+version = "0.4.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e3c5919066adf22df73762e50cffcde3a758f2a848b113b586d1f86728b673b"
+dependencies = [
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "ds323x"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "057e63d03a3beb83d3c9b7a19b799c60e203b0c53f1bbec6a715804907f73a2b"
+dependencies = [
+ "embedded-hal",
+ "rtcc",
+]
+
 [[package]]
 name = "embedded-hal"
 version = "0.2.7"
@@ -119,6 +145,25 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8d5439c4ad607c3c23abf66de8c8bf57ba8adcd1f129e699851a6e43935d339d"
 
+[[package]]
+name = "num-integer"
+version = "0.1.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "225d3389fb3509a24c93f5c29eb6bde2586b98d9f016636dff58d7c6f7569cd9"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "panic-halt"
 version = "0.2.0"
@@ -155,6 +200,15 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rtcc"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3623619ce77c09a7d87cf7c61c5c887b9c7dee8805f66af6c4aa5824be4d9930"
+dependencies = [
+ "chrono",
+]
+
 [[package]]
 name = "rustversion"
 version = "1.0.12"
@@ -167,8 +221,10 @@ version = "0.1.0"
 dependencies = [
  "arduino-hal",
  "binascii",
+ "ds323x",
  "panic-halt",
  "sha1_smol",
+ "ufmt 0.2.0",
 ]
 
 [[package]]
@@ -195,7 +251,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "31d3c0c63312dfc9d8e5c71114d617018a19f6058674003c0da29ee8d8036cdd"
 dependencies = [
  "proc-macro-hack",
- "ufmt-macros",
+ "ufmt-macros 0.2.0",
+ "ufmt-write",
+]
+
+[[package]]
+name = "ufmt"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a64846ec02b57e9108d6469d98d1648782ad6bb150a95a9baac26900bbeab9d"
+dependencies = [
+ "ufmt-macros 0.3.0",
  "ufmt-write",
 ]
 
@@ -211,6 +277,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "ufmt-macros"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d337d3be617449165cb4633c8dece429afd83f84051024079f97ad32a9663716"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "ufmt-write"
 version = "0.1.0"

Cargo.toml

@@ -8,6 +8,8 @@ arduino-hal = {  git = "https://github.com/rahix/avr-hal", features = ["arduino-
 panic-halt = "0.2.0"
 sha1_smol = "1.0.0"
 binascii = { version = "0.1", default-features = false, features = ["decode"] }
+ds323x = "0.5.0"
+ufmt = "0.2.0"
 
 [profile.release]
 lto = true

build.sh

@@ -1 +1 @@
-cargo build -Z build-std=core --target avr-atmega328p.json --release
+cargo build -Z build-std-features=panic_immediate_abort -Z build-std=core --target avr-atmega328p.json --release

src/datetime.rs

@@ -0,0 +1,122 @@
+// This code was extracted from http://git.musl-libc.org/cgit/musl/tree/src/time?h=v0.9.15
+
+pub struct Datetime {
+    pub year: u16,
+    pub month: u8,
+    pub day: u8,
+    pub hours: u8,
+    pub minutes: u8,
+    pub seconds: u8,
+}
+
+impl Datetime {
+    pub fn unix_epoch(&self) -> u64 {
+        let mut year: i64 = self.year as i64 - 1900;
+        let mut month: i64 = self.month as i64 - 1;
+        if month >= 12 || month < 0 {
+            let mut adj = month / 12;
+            month %= 12;
+            if month < 0 {
+                adj -= 1;
+                month += 12;
+            }
+            year += adj as i64;
+        }
+        let (mut t, is_leap) = year_to_secs(year);
+        t += month_to_secs(month, is_leap);
+        t += 86400 * (self.day as i64 - 1);
+        t += 3600 * self.hours as i64;
+        t += 60 * self.minutes as i64;
+        t += self.seconds as i64;
+        t as u64
+    }
+}
+
+fn year_to_secs(year: i64) -> (i64, bool) {
+    let is_leap: bool;
+    let res: i64;
+
+    if year - 2 <= 136 {
+        let y = year as i32;
+        let mut leaps = (y - 68) >> 2;
+        if !((y - 68) & 3 != 0) {
+            leaps -= 1;
+            is_leap = true;
+        } else {
+            is_leap = false;
+        }
+        res = 31536000 * (y - 70) as i64 + 86400 * leaps as i64;
+    } else {
+        let mut cycles: i64;
+        let centuries: i64;
+        let mut leaps: i64;
+        let mut rem: i64;
+
+        cycles = (year - 100) / 400;
+        rem = (year - 100) % 400;
+        if rem < 0 {
+            cycles -= 1;
+            rem += 400;
+        }
+        if rem == 0 {
+            is_leap = true;
+            centuries = 0;
+            leaps = 0;
+        } else {
+            if rem >= 200 {
+                if rem >= 300 {
+                    centuries = 3;
+                    rem -= 300;
+                } else {
+                    centuries = 2;
+                    rem -= 200;
+                }
+            } else {
+                if rem >= 100 {
+                    centuries = 1;
+                    rem -= 100;
+                } else {
+                    centuries = 0;
+                }
+            }
+            if rem == 0 {
+                is_leap = false;
+                leaps = 0;
+            } else {
+                leaps = rem / 4;
+                rem %= 4;
+                is_leap = rem == 0;
+            }
+        }
+
+        leaps += 97 * cycles + 24 * centuries - (is_leap as i64);
+
+        res = (year - 100) * 31536000 + leaps * 86400 + 946684800 + 86400;
+    }
+
+    (res, is_leap)
+}
+
+fn month_to_secs(month: i64, is_leap: bool) -> i64 {
+    const SECS_THROUGH_MONTH: [i64; 12] = [
+        0,           // Jan
+        31 * 86400,  // Feb
+        59 * 86400,  // Mar
+        90 * 86400,  // Apr
+        120 * 86400, // May
+        151 * 86400, // Jun
+        181 * 86400, // Jul
+        212 * 86400, // Aug
+        243 * 86400, // Sep
+        273 * 86400, // Oct
+        304 * 86400, // Nov
+        334 * 86400, // Dec
+    ];
+
+    let mut t = SECS_THROUGH_MONTH[month as usize];
+    if is_leap && month >= 2 {
+        t += 86400;
+    }
+
+    t
+}

src/main.rs

@@ -2,16 +2,17 @@
 #![no_main]
 
 mod crypto;
+mod datetime;
 
-use arduino_hal::hal::usart::BaudrateArduinoExt;
+use arduino_hal::default_serial;
-use arduino_hal::prelude::*;
+use arduino_hal::delay_ms;
-use arduino_hal::{delay_ms, Usart};
 use crypto::hmac_sha1;
+use ds323x::Rtcc;
 
 use panic_halt as _;
 
 const INTERVAL: u64 = 30;
-const SECRET_KEY_MAX_LEN: u8 = 32;
+const SECRET_KEY_MAX_LEN: usize = 32;
 
 fn process_secret<'a>(secret: &str, output: &mut [u8]) -> usize {
     // RFC 6238 Doesn't specify a max length for the secret keys, So I chose 32
@@ -40,7 +41,7 @@ fn process_secret<'a>(secret: &str, output: &mut [u8]) -> usize {
 }
 
 fn generate_otp_token(private_key: &str, actual_time: u64) -> u32 {
-    let mut output = [0u8; 50];
+    let mut output = [0u8; 32];
     let private_key_len = process_secret(private_key, &mut output);
 
     let interval = actual_time / INTERVAL;
@@ -56,38 +57,54 @@ fn generate_otp_token(private_key: &str, actual_time: u64) -> u32 {
     ((raw_token & 0x7F_FF_FF_FF) % 1_000_000) as u32
 }
 
-fn token_to_bytes(mut token: u32, output: &mut [u8]) {
-    let mut inc = 0;
-    while token > 0 {
-        output[inc] = (token % 10) as u8 + b'0';
-        token /= 10;
-        inc += 1;
-    }
-    output.reverse()
-}
-
 #[arduino_hal::entry]
 fn main() -> ! {
     let dp = arduino_hal::Peripherals::take().unwrap();
     let pins = arduino_hal::pins!(dp);
 
     let mut led = pins.d13.into_output();
-    let mut serial = Usart::new(
+    let mut serial = default_serial!(dp, pins, 9600);
-        dp.USART0,
+
-        pins.d0,
+    let i2c_clock = arduino_hal::I2c::new(
-        pins.d1.into_output(),
+        dp.TWI,
-        BaudrateArduinoExt::into_baudrate(9600),
+        pins.a4.into_pull_up_input(),
+        pins.a5.into_pull_up_input(),
+        50000,
     );
+    let mut rtc = ds323x::Ds323x::new_ds3231(i2c_clock);
+
+    let year = rtc.year().unwrap();
+    let month = rtc.month().unwrap();
+    let day = rtc.day().unwrap();
+    let hour = match rtc.hours().unwrap() {
+        ds323x::Hours::AM(val) => val,
+        ds323x::Hours::PM(val) => val + 12,
+        ds323x::Hours::H24(val) => val,
+    };
+    let minute = rtc.minutes().unwrap();
+    let second = rtc.seconds().unwrap();
+
+    let datetime = datetime::Datetime {
+        year: year,
+        month: month,
+        day: day,
+        hours: hour,
+        minutes: minute,
+        seconds: second,
+    };
+    let timestamp = datetime.unix_epoch();
+    ufmt::uwriteln!(&mut serial, "Timestamp: {}", timestamp);
 
-    // let token = generate_otp_token("holaaaaamundo", 1680155315);
     let token = generate_otp_token("FS7J22EHLLSOGKUVJKV2XE7FTIX24JAJ", 1680155315);
-    let mut output = [0u8; 6];
+    ufmt::uwriteln!(&mut serial, "token: {}", token).unwrap();
-    token_to_bytes(token, &mut output);
 
-    for b in output {
+    delay_ms(5000);
-        serial.write_byte(b);
+    let token = generate_otp_token("FS7J22EHLLSOGKUVJKV2XE7FTIX24JAJ", 1680155315);
-    }
+    ufmt::uwriteln!(&mut serial, "token: {}", token).unwrap();
-    serial.write_byte('\n' as u8);
+
+    delay_ms(5000);
+    let token = generate_otp_token("FS7J22EHLLSOGKUVJKV2XE7FTIX24JAJ", 1680155315);
+    ufmt::uwriteln!(&mut serial, "token: {}", token).unwrap();
 
     loop {
         led.toggle();