working nfc reading, but finnicky

src/bin/main.rs

@@ -9,6 +9,7 @@
 
 use core::convert::Infallible;
 
+use alloc::vec::Vec;
 use display_interface_spi::SPIInterface;
 use embedded_graphics::Drawable;
 use embedded_graphics::mono_font::MonoTextStyle;
@@ -112,7 +113,7 @@ fn main() -> ! {
     )
     .unwrap();
 
-    display.clear(Rgb565::BLACK).unwrap();
+    // display.clear(Rgb565::BLACK).unwrap();
 
     let style = MonoTextStyle::new(&FONT_6X10, Rgb565::WHITE);
     Text::new("Hello, ESP32!", Point::new(20, 100), style)
@@ -129,7 +130,7 @@ fn main() -> ! {
         time::Rate,
     };
 
-    let config = I2cConfig::default().with_frequency(Rate::from_khz(100));
+    let config = I2cConfig::default().with_frequency(Rate::from_khz(20));
     let i2c = I2c::new(peripherals.I2C0, config)
         .expect("Failed to init I2C")
         .with_sda(sda)
@@ -139,27 +140,48 @@ fn main() -> ! {
 
     let ms_50 = Duration::from_millis(50);
     let ms_1000 = Duration::from_millis(1000);
+
+    let delay_start = Instant::now();
+    while delay_start.elapsed() < Duration::from_millis(500) {}
+
+    let mut data: Vec<u8> = Vec::with_capacity(858);
+
+    if let Err(e) = pn532.process(
+        &Request::sam_configuration(SAMMode::Normal, false),
+        0,
+        Duration::from_millis(5000),
+    ) {
+        error!("Could not initialize PN532: {e:?}")
+    } else {
+        info!("Successfully init'ed PN532");
+    }
+
     loop {
         info!("Hello world!");
 
-        if let Err(e) = pn532.process(
-            &Request::sam_configuration(SAMMode::Normal, false),
-            0,
-            ms_1000,
+        match pn532.process(
+            &Request::INLIST_ONE_ISO_A_TARGET,
+            23,
+            Duration::from_secs(10),
         ) {
-            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.");
+            Ok(uid) => {
+                info!("uid = {uid:?}");
+                for i in (4..=231) {
+                    let result = pn532.process(&Request::ntag_read(i), 17, ms_1000).unwrap();
+                    let success = result.first().is_some_and(|x| *x == 0);
+                    if success {
+                        // info!("page {i}: {:02x?}", result);
+                        data.extend(&result[1..5]);
+                    } else {
+                        info!("err  {i}: {:02x?}", result);
+                    }
+                }
+                info!("Full data: {data:02x?}");
+                data.clear();
+            }
+            Err(e) => {
+                info!("No NFC card found: {e:?}");
+            }
         }
 
         let delay_start = Instant::now();
@@ -194,7 +216,7 @@ impl pn532::CountDown for TimerWrapper {
         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.start = Instant::now();
         self.duration = timeout.into();
         self.counter = 0;
     }
@@ -203,7 +225,7 @@ impl pn532::CountDown for TimerWrapper {
         let elapsed = self.start.elapsed();
         self.counter += 1;
         if self.counter.is_multiple_of(1) {
-            info!("Elapsed: {elapsed}");
+            // info!("Elapsed: {elapsed}");
         }
         if elapsed >= self.duration {
             Ok(())