examples: Add i2cdetect

Signed-off-by: Patrick José Pereira <[email protected]>

examples/i2cdetect.rs

@@ -0,0 +1,43 @@
+use eh1::i2c::I2c;
+use ftdi_embedded_hal as hal;
+
+fn main() {
+    cfg_if::cfg_if! {
+        if #[cfg(feature = "ftdi")] {
+            let device = ftdi::find_by_vid_pid(0x0403, 0x6014)
+                .interface(ftdi::Interface::A)
+                .open()
+                .unwrap();
+        } else if #[cfg(feature = "libftd2xx")] {
+            let device: libftd2xx::Ft232h = libftd2xx::Ftdi::new().unwrap().try_into().unwrap();
+        } else {
+            compile_error!("Enable feature 'ftdi' or 'libftd2xx'");
+        }
+    }
+
+    let hal = hal::FtHal::init_default(device).unwrap();
+    let mut i2c = hal.i2c().unwrap();
+
+    println!("     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f");
+    for row in 0..8 {
+        print!("{:02x}: ", row << 4);
+        for col in 0..16 {
+            let addr = (row << 4) | col;
+
+            // For addresses i2cdetect typically skips:
+            // 0x00..=0x07 and 0x78..=0x7F
+            if addr < 0x08 || addr > 0x77 {
+                print!("   ");
+                continue;
+            }
+
+            let mut buf = [0u8; 1];
+            if I2c::write_read(&mut i2c, addr, &[], &mut buf).is_ok() {
+                print!("{:02x} ", addr);
+            } else {
+                print!("-- ");
+            }
+        }
+        println!();
+    }
+}