Basic handling of descriptors

[home-hw.git] / Inc / usb.h

diff --git a/Inc/usb.h b/Inc/usb.h
index 589774d6af50e02404e6fa48976edcc392e6f049..1d8291ff61e53a580a8be62fcd66bac1e1d1d86c 100644 (file)
--- a/Inc/usb.h
+++ b/Inc/usb.h
@@ -1,4 +1,5 @@
 #define USB_SELF_POWERED
+#define USB_NUM_CONFIGURATIONS 1
 
 typedef unsigned int uint;
 typedef uint8_t byte;
@@ -12,6 +13,17 @@ typedef int32_t s32;
 
 /*** USB state structure ***/
 
+/*
+ *  We have a single buffer for all control transfers.
+ *  It must be able to contain:
+ *
+ *    - 2-byte status replies
+ *    - UTF-16 versions of all string descriptors
+ *
+ *  In addition to that, its length must be even.
+ */
+#define USB_EP0_BUF_SIZE 256
+
 struct usb {
   PCD_HandleTypeDef *hpcd;
   byte state;                  // USB_STATE_xxx
@@ -23,7 +35,7 @@ struct usb {
   u16 ep0_setup_data_length;
   u16 ep0_remaining_length;
   u16 ep0_total_length;
-  byte status_buf[2];
+  byte ep0_buf[USB_EP0_BUF_SIZE];
 };
 
 void usb_init(struct usb *usb, PCD_HandleTypeDef *hpcd);
@@ -144,9 +156,9 @@ static inline int usb_ep_is_stalled(struct usb *usb, byte ep_addr)
   return ((ep_addr & 0x80) ? usb->hpcd->IN_ep : usb->hpcd->OUT_ep) [ep_addr & 0x7f].is_stall;
 }
 
-static inline HAL_StatusTypeDef usb_ep_transmit(struct usb *usb, byte ep_addr, byte *buf, u32 size)
+static inline HAL_StatusTypeDef usb_ep_transmit(struct usb *usb, byte ep_addr, const byte *buf, u32 size)
 {
-  return HAL_PCD_EP_Transmit(usb->hpcd, ep_addr, buf, size);
+  return HAL_PCD_EP_Transmit(usb->hpcd, ep_addr, (byte *) buf, size);
 }
 
 static inline HAL_StatusTypeDef usb_ep_receive(struct usb *usb, byte ep_addr, byte *buf, u32 size)