From 744a844f75d5f9ad694ac23932ff9061655691f8 Mon Sep 17 00:00:00 2001
From: ede1998 <online@erik-hennig.me>
Date: Wed, 29 Jul 2026 22:24:36 +0200
Subject: [PATCH] compiling nfc code

---
 Cargo.lock      |  11 +++++
 Cargo.toml      |   1 +
 src/bin/main.rs | 124 +++++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 135 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index 71a35fd..9ccd996 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -125,6 +125,7 @@ dependencies = [
  "esp-rtos",
  "ili9341",
  "log",
+ "pn532",
  "smoltcp",
 ]
 
@@ -1217,6 +1218,16 @@ version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a89322df9ebe1c1578d689c92318e070967d1042b512afbe49518723f4e6d5cd"
 
+[[package]]
+name = "pn532"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce656b2f9335bedbd8806597f6f78e644a955366673cd9280a0fb67a0d7b35a1"
+dependencies = [
+ "embedded-hal 1.0.0",
+ "nb 1.1.0",
+]
+
 [[package]]
 name = "portable-atomic"
 version = "1.14.0"
diff --git a/Cargo.toml b/Cargo.toml
index 5a40134..d9d4185 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -51,6 +51,7 @@ embedded-hal = "1.0.0"
 embedded-hal-bus = "0.3.0"
 embedded-graphics = "0.8.2"
 embedded-graphics-core = "0.4.1"
+pn532 = "0.5.0"
 
 
 # For fine tuning these settings, please refer to https://doc.rust-lang.org/cargo/reference/profiles.html
diff --git a/src/bin/main.rs b/src/bin/main.rs
index 4361eef..7299d03 100644
--- a/src/bin/main.rs
+++ b/src/bin/main.rs
@@ -7,6 +7,8 @@
 )]
 #![deny(clippy::large_stack_frames)]
 
+use core::convert::Infallible;
+
 use display_interface_spi::SPIInterface;
 use embedded_graphics::Drawable;
 use embedded_graphics::mono_font::MonoTextStyle;
@@ -27,12 +29,14 @@ use esp_hal::spi::{
     Mode,
     master::{Config, Spi},
 };
-use esp_hal::time::Rate;
 use esp_hal::time::{Duration, Instant};
 use esp_hal::timer::timg::TimerGroup;
+use esp_println::dbg;
 use ili9341::Ili9341;
 use ili9341::Orientation;
 use log::{error, info};
+use pn532::i2c::I2CInterface;
+use pn532::nb;
 
 #[panic_handler]
 fn panic(panic_info: &core::panic::PanicInfo) -> ! {
@@ -67,6 +71,9 @@ fn main() -> ! {
     let dc = peripherals.GPIO17;
     let reset_main = peripherals.GPIO16;
 
+    let sda = peripherals.GPIO21;
+    let scl = peripherals.GPIO22;
+
     esp_alloc::heap_allocator!(#[esp_hal::ram(reclaimed)] size: 73744);
 
     let timg0 = TimerGroup::new(peripherals.TIMG0);
@@ -112,11 +119,126 @@ fn main() -> ! {
         .draw(&mut display)
         .unwrap();
 
+    use pn532::{Pn532, Request, requests::SAMMode};
+
+    // spi is a struct implementing embedded_hal::spi::SpiDevice
+    // timer is a struct implementing pn532::CountDown
+
+    use esp_hal::{
+        i2c::master::{Config as I2cConfig, I2c},
+        time::Rate,
+    };
+
+    let config = I2cConfig::default().with_frequency(Rate::from_khz(100));
+    let i2c = I2c::new(peripherals.I2C0, config)
+        .expect("Failed to init I2C")
+        .with_sda(sda)
+        .with_scl(scl);
+
+    let mut pn532: Pn532<_, _, 32> = Pn532::new(I2CInterface { i2c }, TimerWrapper::new());
+
+    let ms_50 = Duration::from_millis(50);
+    let ms_1000 = Duration::from_millis(1000);
     loop {
         info!("Hello world!");
+
+        if let Err(e) = pn532.process(
+            &Request::sam_configuration(SAMMode::Normal, false),
+            0,
+            ms_1000,
+        ) {
+            error!("Could not initialize PN532: {e:?}")
+        } else {
+            info!("Successfully init'ed PN532");
+        }
+        if let Ok(uid) = pn532.process(&Request::INLIST_ONE_ISO_A_TARGET, 7, ms_1000) {
+            info!("uid = {uid:?}");
+            let result = pn532.process(&Request::ntag_read(10), 17, ms_1000).unwrap();
+            // if result[0] == 0x00 {
+            info!("page 10: {:?}", &result[1..5]);
+            // }
+        }
+        else {
+            info!("No NFC card found.");
+        }
+
         let delay_start = Instant::now();
         while delay_start.elapsed() < Duration::from_millis(500) {}
     }
 
     // for inspiration have a look at the examples at https://github.com/esp-rs/esp-hal/tree/esp-hal-v1.1.0/examples
 }
+
+struct TimerWrapper {
+    // TODO Is that timer accurate enough?
+    start: Instant,
+    duration: Duration,
+    counter: u32,
+}
+
+impl TimerWrapper {
+    pub fn new() -> Self {
+        Self {
+            start: Instant::now(),
+            duration: Duration::ZERO,
+            counter: 0,
+        }
+    }
+}
+
+impl pn532::CountDown for TimerWrapper {
+    type Time = Duration;
+
+    fn start<T>(&mut self, timeout: T)
+    where
+        T: Into<Self::Time>,
+    {
+        // without this debug log, it works worse: stuck in NFC card search without ever returning.
+        self.start = dbg!(Instant::now());
+        self.duration = timeout.into();
+        self.counter = 0;
+    }
+
+    fn wait(&mut self) -> nb::Result<(), Infallible> {
+        let elapsed = self.start.elapsed();
+        self.counter += 1;
+        if self.counter.is_multiple_of(1) {
+            info!("Elapsed: {elapsed}");
+        }
+        if elapsed >= self.duration {
+            Ok(())
+        } else {
+            Err(nb::Error::WouldBlock)
+        }
+    }
+}
+
+/*
+struct TimerWrapper<'a, T>
+where
+    T: esp_hal::DriverMode,
+{
+    timer: esp_hal::timer::PeriodicTimer<'a, T>,
+}
+
+impl<'a, TIM> pn532::CountDown for TimerWrapper<'a, TIM>
+where
+    TIM: esp_hal::DriverMode,
+{
+    type Time = Duration;
+    fn start<T>(&mut self, timeout: T)
+    where
+        T: Into<Self::Time>,
+    {
+        self.timer.start(timeout.into()).unwrap();
+    }
+
+    fn wait(&mut self) -> nb::Result<(), Infallible> {
+        // convert nb::Result<(), void::Void> to nb::Result<(), Infallible>
+        match self.timer.wait() {
+            Ok(_) => Ok(()),
+            Err(_) => Err(nb::Error::WouldBlock),
+        }
+    }
+}
+ */