Move file name generation to own fn

src/main.rs

@@ -21,14 +21,14 @@ use embassy_rp::spi::Spi;
 use embassy_rp::{gpio, spi};
 use embassy_sync::blocking_mutex::raw::ThreadModeRawMutex;
 use embassy_sync::channel::Channel;
-use embedded_hal_bus::spi::ExclusiveDevice;
+use embedded_hal_bus::spi::{ExclusiveDevice, NoDelay};
-use embedded_sdmmc::sdcard::SdCard;
+use embedded_sdmmc::sdcard::{self, SdCard};
 use embedded_sdmmc::{Block, BlockDevice, BlockIdx, File, VolumeIdx};
 use gpio::{Level, Output};
 use {defmt_rtt as _, panic_probe as _};
 
 use embassy_rp::i2c::{self, Config};
-use embassy_time::{Duration, Timer};
+use embassy_time::{Delay, Duration, Timer};
 
 bind_interrupts!(struct Irqs {
    I2C1_IRQ  => i2c::InterruptHandler<embassy_rp::peripherals::I2C1>;
@@ -112,6 +112,7 @@ async fn main(spawner: Spawner) {
     loop {
         let read_value_if_available = async {
             let status = co2::get_status(&mut i2c).await?;
+            info!("Sensor status was: {}", status);
             // Bit 3 is `DATA_READY`
             if status & 0b00001000u8 != 0 {
                 let measured_value = co2::get_measurement(&mut i2c).await?;
@@ -152,7 +153,7 @@ async fn write_to_sd(spi1: SPI1, pin10: PIN_10, pin11: PIN_11, pin12: PIN_12, pi
     let mut config = spi::Config::default();
     config.frequency = 400_000;
     let spi = Spi::new_blocking(spi1, pin10, pin11, pin12, config);
-    let cs = Output::new(pin16, Level::High);
+    let cs = Output::new(pin16, Level::Low);
     let spi_dev = ExclusiveDevice::new_no_delay(spi, cs);
 
     let sdcard = SdCard::new(spi_dev, embassy_time::Delay);
@@ -186,35 +187,26 @@ async fn write_to_sd(spi1: SPI1, pin10: PIN_10, pin11: PIN_11, pin12: PIN_12, pi
         .unwrap();
 
     // Open the root directory (mutably borrows from the volume).
-    let mut root_dir = volume0.open_root_dir().unwrap();
-
-    let mut file_count: usize = 0;
-    root_dir.iterate_dir(|_| file_count += 1).unwrap();
-    info!("Found {} files", file_count);
-
-    // ShortFileName::FILENAME_MAX_LEN == 11. Therefore, we can't go any longer
-    // However, this should be fine as we have 8 chars => 10^8 = 100000000
-    // possible files.
-    let mut file_name_buffer = [0; 11];
-    let mut cursor = Cursor::new(&mut file_name_buffer[..]);
-    core::write!(&mut cursor, "{}.txt", file_count + 1)
-        .expect("File count + extension should definetly fit into 11 bytes");
-    let final_position = cursor.position() as usize;
-    let file_name = core::str::from_utf8(&file_name_buffer[..final_position])
-        .expect("We only put ASCII into the buffer");
 
+    let (len, file_name_buffer) = generate_file_name(&mut volume0);
+    let file_name = Some(
+        core::str::from_utf8(&file_name_buffer[..len]).expect("We only put ASCII into the buffer"),
+    );
     info!("Creating new text file: {}", file_name);
 
+    let mut root_dir = volume0.open_root_dir().unwrap();
     let mut file = root_dir
-        .open_file_in_dir(file_name, embedded_sdmmc::Mode::ReadWriteCreateOrAppend)
+        .open_file_in_dir(
+            file_name.unwrap(),
+            embedded_sdmmc::Mode::ReadWriteCreateOrAppend,
+        )
         .unwrap();
     loop {
         let new_value = MEASUREMENT_VALUES.receive().await;
 
         info!(
-            "Writing measurement value {} to file {}.TXT",
+            "Writing measurement value {} to file {}",
-            new_value,
+            new_value, file_name
-            file_count + 1
         );
 
         // Space for five characters to fit numbers up to 65535 + '\n'
@@ -230,13 +222,43 @@ async fn write_to_sd(spi1: SPI1, pin10: PIN_10, pin11: PIN_11, pin12: PIN_12, pi
         };
         if let Err(e) = write_flush() {
             error!(
-                "Failed to write measuement: {:?}.\nIgnoring missing value...",
+                "Failed to write measuement: {:?}.\nTrying to reinitialize card...",
                 defmt::Debug2Format(&e)
             );
+            sdcard.mark_card_uninit();
         }
     }
 }
 
+type SdCardConcrete<'a, 'b> = SdCard<
+    ExclusiveDevice<Spi<'a, SPI1, embassy_rp::spi::Blocking>, Output<'b, PIN_16>, NoDelay>,
+    Delay,
+>;
+
+/// Generate a file name for the new data file.
+///
+/// The generated name is just going to be "<number-of-files-in-volume>.TXT"
+pub fn generate_file_name(
+    volume: &mut embedded_sdmmc::Volume<'_, SdCardConcrete, DummyTimesource, 4, 4, 1>,
+) -> (usize, [u8; 11]) {
+    // Open the root directory (mutably borrows from the volume).
+    let mut root_dir = volume.open_root_dir().unwrap();
+
+    let mut file_count: usize = 0;
+    root_dir.iterate_dir(|_| file_count += 1).unwrap();
+    info!("Found {} files", file_count);
+
+    // ShortFileName::FILENAME_MAX_LEN == 11. Therefore, we can't go any longer
+    // However, this should be fine as we have 8 chars => 10^8 = 100000000
+    // possible files.
+    let mut file_name_buffer = [0; 11];
+    let mut cursor = Cursor::new(&mut file_name_buffer[..]);
+    core::write!(&mut cursor, "{}.txt", file_count + 1)
+        .expect("File count + extension should definetly fit into 11 bytes");
+    let final_position = cursor.position() as usize;
+    (final_position, file_name_buffer)
+}
+
 pub fn valid_volumes<D>(block_device: &mut D) -> [Option<(VolumeIdx, [u8; 11])>; 4]
 where
     D: BlockDevice,