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@@ -0,0 +1,434 @@
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+/*
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+ * The MIT License (MIT)
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+ *
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+ * Copyright (c) 2019 Peter Lawrence
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a copy
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+ * of this software and associated documentation files (the "Software"), to deal
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+ * in the Software without restriction, including without limitation the rights
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+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+ * copies of the Software, and to permit persons to whom the Software is
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+ * furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included in
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+ * all copies or substantial portions of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+ * THE SOFTWARE.
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+ *
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+ * This file is part of the TinyUSB stack.
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+ */
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+
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+/*
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+ Theory of operation:
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+
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+ The NUC121/NUC125/NUC126 USBD peripheral has eight "EP"s, but each is simplex,
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+ so two collectively (peripheral nomenclature of "EP0" and "EP1") are needed to
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+ implement USB EP0. PERIPH_EP0 and PERIPH_EP1 are used by this driver for
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+ EP0_IN and EP0_OUT respectively. This leaves up to six for user usage.
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+*/
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+
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+#include "tusb_option.h"
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+
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+#if TUSB_OPT_DEVICE_ENABLED && ( (CFG_TUSB_MCU == OPT_MCU_NUC121) || (CFG_TUSB_MCU == OPT_MCU_NUC126) )
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+
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+#include "device/dcd.h"
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+#include "NuMicro.h"
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+
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+/* allocation of USBD RAM for Setup, EP0_IN, and and EP_OUT */
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+#define PERIPH_SETUP_BUF_BASE 0
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+#define PERIPH_SETUP_BUF_LEN 8
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+#define PERIPH_EP0_BUF_BASE (PERIPH_SETUP_BUF_BASE + PERIPH_SETUP_BUF_LEN)
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+#define PERIPH_EP0_BUF_LEN CFG_TUD_ENDPOINT0_SIZE
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+#define PERIPH_EP1_BUF_BASE (PERIPH_EP0_BUF_BASE + PERIPH_EP0_BUF_LEN)
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+#define PERIPH_EP1_BUF_LEN CFG_TUD_ENDPOINT0_SIZE
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+#define PERIPH_EP2_BUF_BASE (PERIPH_EP1_BUF_BASE + PERIPH_EP1_BUF_LEN)
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+
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+/* rather important info unfortunately not provided by device include files: how much there is */
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+#define USBD_BUF_SIZE ((CFG_TUSB_MCU == OPT_MCU_NUC121) ? 768 : 512)
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+
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+enum ep_enum
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+{
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+ PERIPH_EP0 = 0,
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+ PERIPH_EP1 = 1,
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+ PERIPH_EP2 = 2,
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+ PERIPH_EP3 = 3,
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+ PERIPH_EP4 = 4,
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+ PERIPH_EP5 = 5,
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+ PERIPH_EP6 = 6,
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+ PERIPH_EP7 = 7,
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+ PERIPH_MAX_EP,
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+};
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+
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+/* set by dcd_set_address() */
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+static volatile uint8_t assigned_address;
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+
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+/* reset by dcd_init(), this is used by dcd_edpt_open() to assign USBD peripheral buffer addresses */
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+static uint32_t bufseg_addr;
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+
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+/* used by dcd_edpt_xfer() and the ISR to reset the data sync (DATA0/DATA1) in an EP0_IN transfer */
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+static bool active_ep0_xfer;
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+
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+/* RAM table needed to track ongoing transfers performed by dcd_edpt_xfer(), dcd_in_xfer(), and the ISR */
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+static struct xfer_ctl_t
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+{
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+ uint8_t *data_ptr; /* collectively, data_ptr and remaining_bytes track progress of endpoint transfers */
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+ uint16_t remaining_bytes;
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+ uint16_t max_packet_size; /* needed since device driver only finds out this at runtime */
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+ uint16_t total_bytes; /* quantity needed to pass as argument to dcd_event_xfer_complete() (for IN endpoints) */
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+} xfer_table[PERIPH_MAX_EP];
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+
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+/*
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+ local helper functions
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+*/
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+
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+static void usb_attach(void)
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+{
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+ USBD->SE0 &= ~USBD_SE0_SE0_Msk;
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+}
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+
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+static void usb_detach(void)
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+{
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+ USBD->SE0 |= USBD_SE0_SE0_Msk;
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+}
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+
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+static void usb_control_send_zlp(void)
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+{
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+ USBD->EP[PERIPH_EP0].CFG |= USBD_CFG_DSQSYNC_Msk;
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+ USBD->EP[PERIPH_EP0].MXPLD = 0;
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+}
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+
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+/* reconstruct ep_addr from particular USB Configuration Register */
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+static uint8_t decode_ep_addr(USBD_EP_T *ep)
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+{
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+ uint8_t ep_addr = ep->CFG & USBD_CFG_EPNUM_Msk;
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+ if ( USBD_CFG_EPMODE_IN == (ep->CFG & USBD_CFG_STATE_Msk) )
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+ ep_addr |= TUSB_DIR_IN_MASK;
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+ return ep_addr;
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+}
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+
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+/* map 8-bit ep_addr into peripheral endpoint index (PERIPH_EP0...) */
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+static USBD_EP_T *ep_entry(uint8_t ep_addr, bool add)
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+{
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+ USBD_EP_T *ep;
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+ enum ep_enum ep_index;
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+
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+ for (ep_index = PERIPH_EP0, ep = USBD->EP; ep_index < PERIPH_MAX_EP; ep_index++, ep++)
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+ {
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+ if (add)
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+ {
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+ /* take first peripheral endpoint that is unused */
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+ if (0 == (ep->CFG & USBD_CFG_STATE_Msk)) return ep;
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+ }
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+ else
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+ {
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+ /* find a peripheral endpoint that matches ep_addr */
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+ uint8_t candidate_ep_addr = decode_ep_addr(ep);
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+ if (candidate_ep_addr == ep_addr) return ep;
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+ }
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+ }
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+
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+ return NULL;
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+}
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+
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+/* perform an IN endpoint transfer; this is called by dcd_edpt_xfer() and the ISR */
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+static void dcd_in_xfer(struct xfer_ctl_t *xfer, USBD_EP_T *ep)
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+{
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+ uint16_t bytes_now = tu_min16(xfer->remaining_bytes, xfer->max_packet_size);
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+
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+ memcpy((uint8_t *)(USBD_BUF_BASE + ep->BUFSEG), xfer->data_ptr, bytes_now);
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+ ep->MXPLD = bytes_now;
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+}
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+
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+/* centralized location for USBD interrupt enable bit mask */
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+static const uint32_t enabled_irqs = USBD_INTSTS_VBDETIF_Msk | USBD_INTSTS_BUSIF_Msk | USBD_INTSTS_SETUP_Msk | USBD_INTSTS_USBIF_Msk | USBD_INTSTS_SOFIF_Msk;
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+
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+/*
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+ NUC121/NUC125/NUC126 TinyUSB API driver implementation
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+*/
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+
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+void dcd_init(uint8_t rhport)
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+{
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+ (void) rhport;
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+
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+#ifdef SUPPORT_LPM
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+ USBD->ATTR = 0x7D0 | USBD_LPMACK;
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+#else
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+ USBD->ATTR = 0x7D0;
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+#endif
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+
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+ usb_detach();
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+
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+ USBD->STBUFSEG = PERIPH_SETUP_BUF_BASE;
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+
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+ for (enum ep_enum ep_index = PERIPH_EP0; ep_index < PERIPH_MAX_EP; ep_index++)
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+ {
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+ USBD->EP[ep_index].CFGP &= ~USBD_CFG_STATE_Msk;
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+ }
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+
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+ /* allocate the default EP0 endpoints */
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+
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+ USBD->EP[PERIPH_EP0].CFG = USBD_CFG_CSTALL_Msk | USBD_CFG_EPMODE_IN;
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+ USBD->EP[PERIPH_EP0].BUFSEG = PERIPH_EP0_BUF_BASE;
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+ xfer_table[PERIPH_EP0].max_packet_size = PERIPH_EP0_BUF_LEN;
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+
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+ USBD->EP[PERIPH_EP1].CFG = USBD_CFG_CSTALL_Msk | USBD_CFG_EPMODE_OUT;
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+ USBD->EP[PERIPH_EP1].BUFSEG = PERIPH_EP1_BUF_BASE;
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+ xfer_table[PERIPH_EP1].max_packet_size = PERIPH_EP1_BUF_LEN;
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+
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+ /* USB RAM beyond what we've allocated above is available to the user */
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+ bufseg_addr = PERIPH_EP2_BUF_BASE;
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+
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+ usb_attach();
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+
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+ USBD->INTSTS = enabled_irqs;
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+ USBD->INTEN = enabled_irqs;
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+}
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+
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+void dcd_int_enable(uint8_t rhport)
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+{
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+ (void) rhport;
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+ NVIC_EnableIRQ(USBD_IRQn);
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+}
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+
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+void dcd_int_disable(uint8_t rhport)
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+{
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+ (void) rhport;
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+ NVIC_DisableIRQ(USBD_IRQn);
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+}
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+
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+void dcd_set_address(uint8_t rhport, uint8_t dev_addr)
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+{
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+ (void) rhport;
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+ usb_control_send_zlp(); /* SET_ADDRESS is the one exception where TinyUSB doesn't use dcd_edpt_xfer() to generate a ZLP */
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+ assigned_address = dev_addr;
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+}
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+
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+void dcd_set_config(uint8_t rhport, uint8_t config_num)
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+{
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+ (void) rhport;
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+ (void) config_num;
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+}
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+
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+void dcd_remote_wakeup(uint8_t rhport)
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+{
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+ (void) rhport;
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+ USBD->ATTR = USBD_ATTR_RWAKEUP_Msk;
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+}
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+
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+bool dcd_edpt_open(uint8_t rhport, tusb_desc_endpoint_t const * p_endpoint_desc)
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+{
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+ (void) rhport;
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+
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+ USBD_EP_T *ep = ep_entry(p_endpoint_desc->bEndpointAddress, true);
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+ TU_ASSERT(ep);
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+
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+ /* mine the data for the information we need */
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+ int const dir = tu_edpt_dir(p_endpoint_desc->bEndpointAddress);
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+ int const size = p_endpoint_desc->wMaxPacketSize.size;
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+ tusb_xfer_type_t const type = p_endpoint_desc->bmAttributes.xfer;
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+ struct xfer_ctl_t *xfer = &xfer_table[ep - USBD->EP];
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+
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+ /* allocate buffer from USB RAM */
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+ ep->BUFSEG = bufseg_addr;
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+ bufseg_addr += size;
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+ TU_ASSERT(bufseg_addr <= USBD_BUF_SIZE);
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+
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+ /* construct USB Configuration Register value and then write it */
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+ uint32_t cfg = tu_edpt_number(p_endpoint_desc->bEndpointAddress);
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+ cfg |= (TUSB_DIR_IN == dir) ? USBD_CFG_EPMODE_IN : USBD_CFG_EPMODE_OUT;
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+ if (TUSB_XFER_ISOCHRONOUS == type)
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+ cfg |= USBD_CFG_TYPE_ISO;
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+ ep->CFG = cfg;
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+
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+ /* make a note of the endpoint size */
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+ xfer->max_packet_size = size;
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+
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+ return true;
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+}
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+
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+bool dcd_edpt_xfer(uint8_t rhport, uint8_t ep_addr, uint8_t *buffer, uint16_t total_bytes)
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+{
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+ (void) rhport;
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+
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+ /* mine the data for the information we need */
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+ tusb_dir_t dir = tu_edpt_dir(ep_addr);
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+ USBD_EP_T *ep = ep_entry(ep_addr, false);
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+ struct xfer_ctl_t *xfer = &xfer_table[ep - USBD->EP];
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+
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+ /* store away the information we'll needing now and later */
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+ xfer->data_ptr = buffer;
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+ xfer->remaining_bytes = total_bytes;
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+ xfer->total_bytes = total_bytes;
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+
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+ /* for the first of one or more EP0_IN packets in a message, the first must be DATA1 */
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+ if ( (0x80 == ep_addr) && !active_ep0_xfer ) ep->CFG |= USBD_CFG_DSQSYNC_Msk;
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+
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+ if (TUSB_DIR_IN == dir)
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+ dcd_in_xfer(xfer, ep);
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+ else
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+ ep->MXPLD = xfer->max_packet_size;
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+
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+ return true;
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+}
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+
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+void dcd_edpt_stall(uint8_t rhport, uint8_t ep_addr)
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+{
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+ (void) rhport;
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+ USBD_EP_T *ep = ep_entry(ep_addr, false);
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+ ep->CFGP |= USBD_CFGP_SSTALL_Msk;
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+}
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+
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+void dcd_edpt_clear_stall(uint8_t rhport, uint8_t ep_addr)
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+{
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+ (void) rhport;
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+ USBD_EP_T *ep = ep_entry(ep_addr, false);
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+ ep->CFG |= USBD_CFG_CSTALL_Msk;
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+}
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+
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+void USBD_IRQHandler(void)
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+{
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+ uint32_t status = USBD->INTSTS;
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+#ifdef SUPPORT_LPM
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+ uint32_t state = USBD->ATTR & 0x300f;
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+#else
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+ uint32_t state = USBD->ATTR & 0xf;
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+#endif
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+
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+ if(status & USBD_INTSTS_VBDETIF_Msk)
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+ {
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+ if(USBD->VBUSDET & USBD_VBUSDET_VBUSDET_Msk)
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+ {
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+ /* USB connect */
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+ USBD->ATTR |= USBD_ATTR_USBEN_Msk | USBD_ATTR_PHYEN_Msk;
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+ }
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+ else
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+ {
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+ /* USB disconnect */
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+ USBD->ATTR &= ~USBD_ATTR_USBEN_Msk;
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+ }
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+ }
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+
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+ if(status & USBD_INTSTS_BUSIF_Msk)
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+ {
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+ if(state & USBD_ATTR_USBRST_Msk)
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+ {
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+ /* USB bus reset */
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+ USBD->ATTR |= USBD_ATTR_USBEN_Msk | USBD_ATTR_PHYEN_Msk;
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+
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+ /* Reset all endpoints to DATA0 */
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+ for(enum ep_enum ep_index = PERIPH_EP0; ep_index < PERIPH_MAX_EP; ep_index++)
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+ USBD->EP[ep_index].CFG &= ~USBD_CFG_DSQSYNC_Msk;
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+
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+ /* Reset USB device address */
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+ USBD->FADDR = 0;
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+
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+ /* reset EP0_IN flag */
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+ active_ep0_xfer = false;
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+
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+ dcd_event_bus_signal(0, DCD_EVENT_BUS_RESET, true);
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+ }
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+
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+ if(state & USBD_ATTR_SUSPEND_Msk)
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+ {
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+ /* Enable USB but disable PHY */
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+ USBD->ATTR &= ~USBD_ATTR_PHYEN_Msk;
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+ dcd_event_bus_signal(0, DCD_EVENT_SUSPEND, true);
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+ }
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+
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+ if(state & USBD_ATTR_RESUME_Msk)
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+ {
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+ /* Enable USB and enable PHY */
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+ USBD->ATTR |= USBD_ATTR_USBEN_Msk | USBD_ATTR_PHYEN_Msk;
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+ dcd_event_bus_signal(0, DCD_EVENT_RESUME, true);
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+ }
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+ }
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+
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+ if(status & USBD_INTSTS_SETUP_Msk)
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+ {
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+ /* clear the data ready flag of control endpoints */
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+ USBD->EP[PERIPH_EP0].CFGP |= USBD_CFGP_CLRRDY_Msk;
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+ USBD->EP[PERIPH_EP1].CFGP |= USBD_CFGP_CLRRDY_Msk;
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+
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+ /* get SETUP packet from USB buffer */
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+ dcd_event_setup_received(0, (uint8_t *)USBD_BUF_BASE, true);
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+ }
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+
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+ if(status & USBD_INTSTS_USBIF_Msk)
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+ {
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+ if (status & USBD_INTSTS_EPEVT0_Msk) /* PERIPH_EP0 (EP0_IN) event: this is treated separately from the rest */
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+ {
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+ /* given ACK from host has happened, we can now set the address (if not already done) */
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+ if((USBD->FADDR != assigned_address) && (USBD->FADDR == 0)) USBD->FADDR = assigned_address;
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+
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+ uint16_t const available_bytes = USBD->EP[PERIPH_EP0].MXPLD;
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|
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+
|
|
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+ active_ep0_xfer = (available_bytes == xfer_table[PERIPH_EP0].max_packet_size);
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|
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+
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|
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+ dcd_event_xfer_complete(0, 0x80, available_bytes, XFER_RESULT_SUCCESS, true);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* service PERIPH_EP1 through PERIPH_EP7 */
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|
|
+ enum ep_enum ep_index;
|
|
|
+ uint32_t mask;
|
|
|
+ struct xfer_ctl_t *xfer;
|
|
|
+ USBD_EP_T *ep;
|
|
|
+ for (ep_index = PERIPH_EP1, mask = USBD_INTSTS_EPEVT1_Msk, xfer = &xfer_table[PERIPH_EP1], ep = &USBD->EP[PERIPH_EP1]; ep_index <= PERIPH_EP7; ep_index++, mask <<= 1, xfer++, ep++)
|
|
|
+ {
|
|
|
+ if(status & mask)
|
|
|
+ {
|
|
|
+ USBD->INTSTS = mask;
|
|
|
+
|
|
|
+ uint16_t const available_bytes = ep->MXPLD;
|
|
|
+ uint8_t const ep_addr = decode_ep_addr(ep);
|
|
|
+ bool const out_ep = !(ep_addr & TUSB_DIR_IN_MASK);
|
|
|
+
|
|
|
+ if (out_ep)
|
|
|
+ {
|
|
|
+ /* copy the data from the PC to the previously provided buffer */
|
|
|
+ memcpy(xfer->data_ptr, (uint8_t *)(USBD_BUF_BASE + ep->BUFSEG), available_bytes);
|
|
|
+ xfer->remaining_bytes -= available_bytes;
|
|
|
+ xfer->data_ptr += available_bytes;
|
|
|
+
|
|
|
+ /* when the transfer is finished, alert TinyUSB */
|
|
|
+ if ( (0 == xfer->remaining_bytes) || (available_bytes < xfer->max_packet_size) )
|
|
|
+ dcd_event_xfer_complete(0, ep_addr, available_bytes, XFER_RESULT_SUCCESS, true);
|
|
|
+ }
|
|
|
+ else if (xfer->remaining_bytes)
|
|
|
+ {
|
|
|
+ /* update the bookkeeping to reflect the data that has now been sent to the PC */
|
|
|
+ xfer->remaining_bytes -= available_bytes;
|
|
|
+ xfer->data_ptr += available_bytes;
|
|
|
+
|
|
|
+ /* if more data to send, send it; otherwise, alert TinyUSB that we've finished */
|
|
|
+ if (xfer->remaining_bytes)
|
|
|
+ dcd_in_xfer(xfer, ep);
|
|
|
+ else
|
|
|
+ dcd_event_xfer_complete(0, ep_addr, xfer->total_bytes, XFER_RESULT_SUCCESS, true);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if(status & USBD_INTSTS_SOFIF_Msk)
|
|
|
+ {
|
|
|
+ /* Start-Of-Frame event */
|
|
|
+ dcd_event_bus_signal(0, DCD_EVENT_SOF, true);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* acknowledge all interrupts */
|
|
|
+ USBD->INTSTS = status & enabled_irqs;
|
|
|
+}
|
|
|
+
|
|
|
+void dcd_isr(uint8_t rhport)
|
|
|
+{
|
|
|
+ (void) rhport;
|
|
|
+ USBD_IRQHandler();
|
|
|
+}
|
|
|
+
|
|
|
+#endif
|
Peter Lawrence