core: usb: allow PCD single buffer endpoint kind usage

Defining USBD_CDC_USE_SINGLE_BUFFER will set endpoint kind
as single buffer instead of double one per default.

Fixes stm32duino#804

Signed-off-by: Frederic Pillon <[email protected]>

Author: fpistm

Diff for: cores/arduino/stm32/usb/usbd_ep_conf.c

@@ -37,7 +37,11 @@ const ep_desc_t ep_def[] = {
 #else
   {0x00,       PCD_SNG_BUF, PMA_EP0_OUT_ADDR },
   {0x80,       PCD_SNG_BUF, PMA_EP0_IN_ADDR  },
+#ifndef USBD_CDC_USE_SINGLE_BUFFER
   {CDC_OUT_EP, PCD_DBL_BUF, PMA_CDC_OUT_ADDR },
+#else
+  {CDC_OUT_EP, PCD_SNG_BUF, PMA_CDC_OUT_ADDR },
+#endif
   {CDC_IN_EP,  PCD_SNG_BUF, PMA_CDC_IN_ADDR  },
   {CDC_CMD_EP, PCD_SNG_BUF, PMA_CDC_CMD_ADDR }
 #endif

Diff for: cores/arduino/stm32/usb/usbd_ep_conf.h

@@ -72,8 +72,12 @@ typedef struct {
 
 #ifdef USBD_USE_CDC
 #define PMA_CDC_OUT_BASE    (PMA_EP0_IN_ADDR + USB_MAX_EP0_SIZE)
+#ifndef USBD_CDC_USE_SINGLE_BUFFER
 #define PMA_CDC_OUT_ADDR    ((PMA_CDC_OUT_BASE + USB_FS_MAX_PACKET_SIZE) | \
                             (PMA_CDC_OUT_BASE << 16U))
+#else
+#define PMA_CDC_OUT_ADDR    (PMA_CDC_OUT_BASE + USB_FS_MAX_PACKET_SIZE)
+#endif
 #define PMA_CDC_IN_ADDR     (PMA_CDC_OUT_BASE + USB_FS_MAX_PACKET_SIZE * 2)
 #define PMA_CDC_CMD_ADDR    (PMA_CDC_IN_ADDR + CDC_CMD_PACKET_SIZE)
 #endif /* USBD_USE_CDC */