Improved NFC reading speed

src/bin/main.rs

@@ -17,6 +17,7 @@ use creaturedex::navigation::inputs::Inputs;
 use creaturedex::navigation::navigation::{self, CARD_DATA};
 use creaturedex::network::wifi::setup_wifi;
 use embassy_executor::Spawner;
+use embassy_time::Instant;
 use embedded_hal_bus::i2c::AtomicDevice;
 use embedded_hal_bus::util::AtomicCell;
 use esp_hal::Blocking;
@@ -68,7 +69,7 @@ async fn main(spawner: Spawner) {
         peripherals.GPIO12, // shared dc
     )));
 
-    let config = I2cConfig::default().with_frequency(esp_hal::time::Rate::from_khz(20));
+    let config = I2cConfig::default().with_frequency(esp_hal::time::Rate::from_khz(400));
     let i2c = match I2c::new(peripherals.I2C0, config) {
         Ok(bus) => bus.with_sda(peripherals.GPIO17).with_scl(peripherals.GPIO18),
         Err(e) => {
@@ -113,14 +114,16 @@ async fn main(spawner: Spawner) {
 async fn nfc_driver_task(mut nfc_driver: NfcPn532Driver<AtomicDevice<'static, I2c<'static, Blocking>>>) {
     loop {
         while CARD_DATA.lock().await.is_none() {
+            let start = Instant::now();
             match nfc_driver.read_card_data().await {
                 Ok(card_data) => {
-                    log::info!("NFC Card Data Read: {:?}", card_data);
                     let Some(split_data) = split_nfc_hex(&card_data) else {
                         log::error!("Failed to split NFC card data");
                         continue;
                     };
                     CARD_DATA.lock().await.replace(Card::try_from(split_data).unwrap());
+                    let elapsed_ms = start.elapsed().as_millis();
+                    log::info!("NFC read duration: {} ms, card data length: {}", elapsed_ms, card_data.len());
                 }
                 Err(_) => {
                     log::info!("No NFC card found");