5 files changed, 19 insertions, 6 deletions
diff --git a/stmhal/Makefile b/stmhal/Makefile
index 5f31be577..ce5ab639d 100644
--- a/stmhal/Makefile
+++ b/stmhal/Makefile
@@ -299,7 +299,7 @@ GEN_PINS_AF_PY = $(BUILD)/pins_af.py
 INSERT_USB_IDS = ../tools/insert-usb-ids.py
 FILE2H = ../tools/file2h.py
 
-USB_IDS_FILE = usbd_desc.c
+USB_IDS_FILE = usb.h
 CDCINF_TEMPLATE = pybcdc.inf_template
 GEN_CDCINF_FILE = $(HEADER_BUILD)/pybcdc.inf
 GEN_CDCINF_HEADER = $(HEADER_BUILD)/pybcdc_inf.h
diff --git a/stmhal/pybcdc.inf_template b/stmhal/pybcdc.inf_template
index 87cd1467b..8e1803bef 100644
--- a/stmhal/pybcdc.inf_template
+++ b/stmhal/pybcdc.inf_template
@@ -77,10 +77,10 @@ ServiceBinary=%12%\usbser.sys
 [SourceDisksFiles]
 [SourceDisksNames]
 [DeviceList]
-%DESCRIPTION%=DriverInstall, USB\VID_${USB_VID}&PID_${USB_PID}&MI_00, USB\VID_${USB_VID}&PID_${USB_PID}&MI_01
+%DESCRIPTION%=DriverInstall, USB\VID_${USB_VID}&PID_${USB_PID_CDC_MSC}&MI_00, USB\VID_${USB_VID}&PID_${USB_PID_CDC_MSC}&MI_01, USB\VID_${USB_VID}&PID_${USB_PID_CDC_HID}&MI_00, USB\VID_${USB_VID}&PID_${USB_PID_CDC_HID}&MI_01, USB\VID_${USB_VID}&PID_${USB_PID_CDC}
 
 [DeviceList.NTamd64]
-%DESCRIPTION%=DriverInstall, USB\VID_${USB_VID}&PID_${USB_PID}&MI_00, USB\VID_${USB_VID}&PID_${USB_PID}&MI_01
+%DESCRIPTION%=DriverInstall, USB\VID_${USB_VID}&PID_${USB_PID_CDC_MSC}&MI_00, USB\VID_${USB_VID}&PID_${USB_PID_CDC_MSC}&MI_01, USB\VID_${USB_VID}&PID_${USB_PID_CDC_HID}&MI_00, USB\VID_${USB_VID}&PID_${USB_PID_CDC_HID}&MI_01, USB\VID_${USB_VID}&PID_${USB_PID_CDC}
 
 ;---------------------------------------------------------------------
 ;  String Definitions
diff --git a/stmhal/usb.c b/stmhal/usb.c
index 085eae129..cedd3525c 100644
--- a/stmhal/usb.c
+++ b/stmhal/usb.c
@@ -98,7 +98,7 @@ bool pyb_usb_dev_init(uint16_t vid, uint16_t pid, usb_device_mode_t mode, USBD_H
 #ifdef USE_DEVICE_MODE
     if (!(pyb_usb_flags & PYB_USB_FLAG_DEV_ENABLED)) {
         // only init USB once in the device's power-lifetime
-        USBD_SetVIDPIDRelease(vid, pid, 0x0200);
+        USBD_SetVIDPIDRelease(vid, pid, 0x0200, mode == USBD_MODE_CDC);
         if (USBD_SelectMode(mode, hid_info) != 0) {
             return false;
         }
diff --git a/stmhal/usbd_desc.c b/stmhal/usbd_desc.c
index 2b8a79b15..9f2a84162 100644
--- a/stmhal/usbd_desc.c
+++ b/stmhal/usbd_desc.c
@@ -81,7 +81,20 @@ __ALIGN_BEGIN static uint8_t USBD_LangIDDesc[USB_LEN_LANGID_STR_DESC] __ALIGN_EN
 __ALIGN_BEGIN static uint8_t USBD_StrDesc[USBD_MAX_STR_DESC_SIZ] __ALIGN_END;
 
 // set the VID, PID and device release number
-void USBD_SetVIDPIDRelease(uint16_t vid, uint16_t pid, uint16_t device_release_num) {
+void USBD_SetVIDPIDRelease(uint16_t vid, uint16_t pid, uint16_t device_release_num, int cdc_only) {
+    if (cdc_only) {
+        // Make it look like a Communications device if we're only
+        // using CDC. Otherwise, windows gets confused when we tell it that
+        // its a composite device with only a cdc serial interface.
+        hUSBDDeviceDesc[4] = 0x02;
+        hUSBDDeviceDesc[5] = 0x00;
+        hUSBDDeviceDesc[6] = 0x00;
+    } else {
+        // For the other modes, we make this look like a composite device.
+        hUSBDDeviceDesc[4] = 0xef;
+        hUSBDDeviceDesc[5] = 0x02;
+        hUSBDDeviceDesc[6] = 0x01;
+    }
     hUSBDDeviceDesc[8] = LOBYTE(vid);
     hUSBDDeviceDesc[9] = HIBYTE(vid);
     hUSBDDeviceDesc[10] = LOBYTE(pid);
diff --git a/stmhal/usbd_desc.h b/stmhal/usbd_desc.h
index 609fa8da8..93e222fc9 100644
--- a/stmhal/usbd_desc.h
+++ b/stmhal/usbd_desc.h
@@ -26,4 +26,4 @@
 
 extern const USBD_DescriptorsTypeDef USBD_Descriptors;
 
-void USBD_SetVIDPIDRelease(uint16_t vid, uint16_t pid, uint16_t device_release_num);
+void USBD_SetVIDPIDRelease(uint16_t vid, uint16_t pid, uint16_t device_release_num, int cdc_only);