STM32: USB: support EP0 read/write operations via standard interface

Allow to submit EP0 read/write requests using the standard interface
usb_ep_read/write().

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@4256 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/bertos/cpu/cortex-m3/drv/usb_stm32.c b/bertos/cpu/cortex-m3/drv/usb_stm32.c
index 52f208dcec413693386c078c4c7de28c3d1c827f..eff625a45d60868d6c82815d0f6a894b55170f56 100644 (file)
--- a/bertos/cpu/cortex-m3/drv/usb_stm32.c
+++ b/bertos/cpu/cortex-m3/drv/usb_stm32.c
@@ -1098,20 +1098,23 @@ ssize_t usb_ep_read(int ep, void *buffer, ssize_t size)
 {
        int ep_num = USB_EpLogToPhysAdd(ep);
 
-       if (UNLIKELY(!size))
-               return 0;
-       size = MIN(size, USB_RX_MAX_SIZE);
-       rx_done = false;
-       rx_size = 0;
-
        /* Non-blocking read for EP0 */
        if (ep_num == CTRL_ENP_OUT)
        {
                size = usb_size(size, setup_packet.wLength);
-               __usb_ep_write(ep_num, buffer, size,
-                               USB_StatusHandler);
+               if (!size)
+                       USB_StatusHandler(ep_num);
+               else
+                       __usb_ep_read(ep_num, buffer, size,
+                                       USB_StatusHandler);
                return size;
        }
+       if (UNLIKELY(!size))
+               return 0;
+       size = MIN(size, USB_RX_MAX_SIZE);
+       rx_done = false;
+       rx_size = 0;
+
        /* Blocking read */
        __usb_ep_read(ep_num, buffer, size, usb_ep_read_complete);
        while (!rx_done)
@@ -1140,20 +1143,24 @@ ssize_t usb_ep_write(int ep, const void *buffer, ssize_t size)
 {
        int ep_num = USB_EpLogToPhysAdd(ep);
 
-       if (UNLIKELY(!size))
-               return 0;
-       size = MIN(size, USB_TX_MAX_SIZE);
-       tx_done = false;
-       tx_size = 0;
-
        /* Non-blocking write for EP0 */
        if (ep_num == CTRL_ENP_IN)
        {
                size = usb_size(size, setup_packet.wLength);
-               __usb_ep_write(ep_num, buffer, size,
-                               USB_StatusHandler);
+               LOG_INFO("%s: size = %d\n", __func__, size);
+               if (!size)
+                       USB_StatusHandler(ep_num);
+               else
+                       __usb_ep_write(ep_num, buffer, size,
+                                       USB_StatusHandler);
                return size;
        }
+       if (UNLIKELY(!size))
+               return 0;
+       size = MIN(size, USB_TX_MAX_SIZE);
+       tx_done = false;
+       tx_size = 0;
+
        /* Blocking write */
        __usb_ep_write(ep_num, buffer, size, usb_ep_write_complete);
        while (!tx_done)