From 62fdd309c55286222d1add4ca3051353da0e11b8 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Wed, 31 Mar 2021 17:40:53 +0200
Subject: Enable USB CDC ACM for eval-clock-cw-tx

---
 sw/eval-clock-cw-tx/src/usb.rs | 91 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 sw/eval-clock-cw-tx/src/usb.rs

(limited to 'sw/eval-clock-cw-tx/src/usb.rs')

diff --git a/sw/eval-clock-cw-tx/src/usb.rs b/sw/eval-clock-cw-tx/src/usb.rs
new file mode 100644
index 0000000..941a024
--- /dev/null
+++ b/sw/eval-clock-cw-tx/src/usb.rs
@@ -0,0 +1,91 @@
+
+use stm32f1xx_hal::gpio;
+use stm32f1xx_hal::pac;
+use stm32f1xx_hal::pac::{interrupt, Interrupt};
+use stm32f1xx_hal::usb::{Peripheral, UsbBus, UsbBusType};
+use usb_device::{bus::UsbBusAllocator, prelude::*};
+use usbd_serial::{SerialPort, USB_CLASS_CDC};
+
+static mut USB_BUS: Option<UsbBusAllocator<UsbBusType>> = None;
+static mut USB_SERIAL: Option<usbd_serial::SerialPort<UsbBusType>> = None;
+static mut USB_DEVICE: Option<UsbDevice<UsbBusType>> = None;
+
+pub struct USB {
+}
+
+impl USB {
+    pub fn new(
+        usb: stm32f1xx_hal::pac::USB,
+        pin_dm: gpio::gpioa::PA11<gpio::Input<gpio::Floating>>,
+        pin_dp: gpio::gpioa::PA12<gpio::Input<gpio::Floating>>) -> Self {
+
+        let peripheral = Peripheral {
+            usb,
+            pin_dm,
+            pin_dp,
+        };
+
+        unsafe {
+            let bus = UsbBus::new(peripheral);
+
+            USB_BUS = Some(bus);
+
+            USB_SERIAL = Some(SerialPort::new(USB_BUS.as_ref().unwrap()));
+
+            let usb_dev = UsbDeviceBuilder::new(USB_BUS.as_ref().unwrap(), UsbVidPid(0x1d50, 0x5120)) // Openmoko Neo1973 serial
+                .manufacturer("HB9EGM")
+                .product("Beep Machine")
+                .serial_number("1")
+                .device_class(USB_CLASS_CDC)
+                .build();
+
+            USB_DEVICE = Some(usb_dev);
+        }
+
+        USB{}
+    }
+
+    pub fn enable_interrupts(&self) {
+        unsafe {
+            pac::NVIC::unmask(Interrupt::USB_HP_CAN_TX);
+            pac::NVIC::unmask(Interrupt::USB_LP_CAN_RX0);
+        }
+    }
+}
+
+#[allow(non_snake_case)]
+#[interrupt]
+fn USB_HP_CAN_TX() {
+    usb_interrupt();
+}
+
+#[allow(non_snake_case)]
+#[interrupt]
+fn USB_LP_CAN_RX0() {
+    usb_interrupt();
+}
+
+fn usb_interrupt() {
+    let usb_dev = unsafe { USB_DEVICE.as_mut().unwrap() };
+    let serial = unsafe { USB_SERIAL.as_mut().unwrap() };
+
+    if !usb_dev.poll(&mut [serial]) {
+        return;
+    }
+
+    let mut buf = [0u8; 8];
+
+    match serial.read(&mut buf) {
+        Ok(count) if count > 0 => {
+            // Echo back in upper case
+            for c in buf[0..count].iter_mut() {
+                if 0x61 <= *c && *c <= 0x7a {
+                    *c &= !0x20;
+                }
+            }
+
+            serial.write(&buf[0..count]).ok();
+        }
+        _ => {}
+    }
+}
-- 
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