Added partial synchronous bit-bang support for FT4232H ports C and D

examples/blink_sbb.rs

@@ -0,0 +1,48 @@
+use eh0::digital::v2::OutputPin;
+use ftdi_embedded_hal as hal;
+use std::{thread::sleep, time::Duration};
+
+const NUM_BLINK: usize = 10;
+const SLEEP_DURATION: Duration = Duration::from_millis(500);
+
+/// Toggle the AD0 output by reading its state on AD1, inverting, and
+/// writing it back out on AD0. This test requires that AD0 and AD1 are
+/// connected together.
+fn main() {
+    cfg_if::cfg_if! {
+        if #[cfg(feature = "ftdi")] {
+            // FTDI FT4232H: vid=0x0403, pid=0x6011.
+            let device = ftdi::find_by_vid_pid(0x0403, 0x6011)
+            .interface(ftdi::Interface::D)
+            .open()
+            .unwrap();
+
+            // Default settings suffice.
+            let hal_cfg = hal::FtHalSbbSettings::default();
+            let hal = hal::FtHalSbb::init(epe_if_d, hal_cfg).unwrap();
+
+            // Assign the GPIO pins.
+            let mut gpio_ado0 = hal.ad0().unwrap();
+            let mut gpio_adi1 = hal.adi1().unwrap();
+
+            println!("Starting blinky using synchronous bit-bang gpio example");
+            for n in 0..NUM_BLINK {
+                let state = gpio_adi1.is_high().expect("failed to get GPIO AD1 state");
+                println!("Read State: {}", state);
+
+                if state {
+                    gpio_ado0.set_low().expect("failed to set GPIO AD0 low");
+                } else {
+                    gpio_ado0.set_high().expect("failed to set GPIO AD0 high");
+                }
+
+                sleep(SLEEP_DURATION);
+
+                println!("Blinked {}/{} times", n + 1, NUM_BLINK);
+            }
+
+        } else {
+            compile_error!("Feature 'ftdi' must be enabled");
+        }
+    }
+}