2020-09-14 08:22:29 +00:00
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/*
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* usb_e1.c
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*
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* Copyright (C) 2019-2020 Sylvain Munaut <tnt@246tNt.com>
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <no2usb/usb_hw.h>
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#include <no2usb/usb_priv.h>
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#include "console.h"
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#include "misc.h"
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struct {
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2020-12-14 14:56:28 +00:00
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bool running; /* are we running (transceiving USB data)? */
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int out_bdi; /* buffer descriptor index for OUT EP */
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int in_bdi; /* buffer descriptor index for IN EP */
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2020-09-14 08:22:29 +00:00
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} g_usb_e1;
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/* Hack */
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unsigned int e1_rx_need_data(unsigned int usb_addr, unsigned int max_len);
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unsigned int e1_tx_feed_data(unsigned int usb_addr, unsigned int len);
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unsigned int e1_tx_level(void);
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unsigned int e1_rx_level(void);
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/* ---- */
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bool
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usb_ep_boot(const struct usb_intf_desc *intf, uint8_t ep_addr, bool dual_bd);
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static void
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_usb_fill_feedback_ep(void)
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{
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static uint16_t ticks_prev = 0;
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uint16_t ticks;
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uint32_t val = 8192;
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unsigned int level;
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2020-12-14 14:56:15 +00:00
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/* Compute real E1 tick count (with safety against bad values) */
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2020-09-14 08:22:29 +00:00
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ticks = e1_tick_read();
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val = (ticks - ticks_prev) & 0xffff;
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ticks_prev = ticks;
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if ((val < 7168) | (val > 9216))
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val = 8192;
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/* Bias depending on TX fifo level */
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level = e1_tx_level();
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if (level < (3 * 16))
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val += 256;
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else if (level > (8 * 16))
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val -= 256;
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/* Prepare buffer */
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usb_data_write(64, &val, 4);
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usb_ep_regs[1].in.bd[0].ptr = 64;
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usb_ep_regs[1].in.bd[0].csr = USB_BD_STATE_RDY_DATA | USB_BD_LEN(3);
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}
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void
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usb_e1_run(void)
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{
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int bdi;
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if (!g_usb_e1.running)
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return;
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/* EP2 IN */
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bdi = g_usb_e1.in_bdi;
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while ((usb_ep_regs[2].in.bd[bdi].csr & USB_BD_STATE_MSK) != USB_BD_STATE_RDY_DATA)
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{
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uint32_t ptr = usb_ep_regs[2].in.bd[bdi].ptr;
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uint32_t hdr;
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/* Error check */
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if ((usb_ep_regs[2].in.bd[bdi].csr & USB_BD_STATE_MSK) == USB_BD_STATE_DONE_ERR)
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puts("Err EP2 IN\n");
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/* Get some data from E1 */
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int n = e1_rx_level();
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if (n > 64)
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n = 12;
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else if (n > 32)
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n = 10;
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else if (n > 8)
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n = 8;
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else if (!n)
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break;
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n = e1_rx_need_data((ptr >> 2) + 1, n);
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/* Write header */
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hdr = 0x616b00b5;
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usb_data_write(ptr, &hdr, 4);
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/* Resubmit */
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usb_ep_regs[2].in.bd[bdi].csr = USB_BD_STATE_RDY_DATA | USB_BD_LEN((n * 32) + 4);
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/* Next BDI */
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bdi ^= 1;
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g_usb_e1.in_bdi = bdi;
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}
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/* EP1 OUT */
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bdi = g_usb_e1.out_bdi;
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while ((usb_ep_regs[1].out.bd[bdi].csr & USB_BD_STATE_MSK) != USB_BD_STATE_RDY_DATA)
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{
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uint32_t ptr = usb_ep_regs[1].out.bd[bdi].ptr;
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uint32_t csr = usb_ep_regs[1].out.bd[bdi].csr;
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uint32_t hdr;
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/* Error check */
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if ((csr & USB_BD_STATE_MSK) == USB_BD_STATE_DONE_ERR) {
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puts("Err EP1 OUT\n");
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goto refill;
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}
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/* Grab header */
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usb_data_read(&hdr, ptr, 4);
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/* Empty data into the FIFO */
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int n = ((csr & USB_BD_LEN_MSK) - 4) / 32;
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n = e1_tx_feed_data((ptr >> 2) + 1, n);
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refill:
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/* Refill it */
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usb_ep_regs[1].out.bd[bdi].csr = USB_BD_STATE_RDY_DATA | USB_BD_LEN(388);
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/* Next BDI */
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bdi ^= 1;
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g_usb_e1.out_bdi = bdi;
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static int x = 0;
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if ((x++ & 0xff) == 0xff)
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puts(".");
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}
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/* EP1 IN */
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if ((usb_ep_regs[1].in.bd[0].csr & USB_BD_STATE_MSK) != USB_BD_STATE_RDY_DATA)
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{
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_usb_fill_feedback_ep();
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}
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}
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static const struct usb_intf_desc *
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_find_intf(const struct usb_conf_desc *conf, uint8_t idx)
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{
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const struct usb_intf_desc *intf = NULL;
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const void *sod, *eod;
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if (!conf)
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return NULL;
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sod = conf;
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eod = sod + conf->wTotalLength;
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while (1) {
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sod = usb_desc_find(sod, eod, USB_DT_INTF);
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if (!sod)
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break;
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intf = (void*)sod;
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if (intf->bInterfaceNumber == idx)
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return intf;
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sod = usb_desc_next(sod);
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}
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return NULL;
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}
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2020-12-14 12:48:09 +00:00
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static enum usb_fnd_resp
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2020-09-14 08:22:29 +00:00
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_e1_set_conf(const struct usb_conf_desc *conf)
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{
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const struct usb_intf_desc *intf;
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printf("e1 set_conf %08x\n", conf);
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if (!conf)
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return USB_FND_SUCCESS;
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intf = _find_intf(conf, 0);
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if (!intf)
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return USB_FND_ERROR;
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printf("e1 set_conf %08x\n", intf);
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usb_ep_boot(intf, 0x01, true);
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usb_ep_boot(intf, 0x81, true);
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usb_ep_boot(intf, 0x82, true);
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return USB_FND_SUCCESS;
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}
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2020-12-14 12:48:09 +00:00
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static enum usb_fnd_resp
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2020-09-14 08:22:29 +00:00
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_e1_set_intf(const struct usb_intf_desc *base, const struct usb_intf_desc *sel)
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{
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if (base->bInterfaceNumber != 0)
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return USB_FND_CONTINUE;
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if (sel->bAlternateSetting != 1)
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return USB_FND_SUCCESS;
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/* Hack to avoid re-setting while running ... avoid BD desync */
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if (g_usb_e1.running)
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return USB_FND_SUCCESS;
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g_usb_e1.running = true;
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/* Configure EP1 OUT / EP2 IN */
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usb_ep_regs[1].out.status = USB_EP_TYPE_ISOC | USB_EP_BD_DUAL; /* Type=Isochronous, dual buffered */
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usb_ep_regs[2].in.status = USB_EP_TYPE_ISOC | USB_EP_BD_DUAL; /* Type=Isochronous, dual buffered */
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/* Configure EP1 IN (feedback) */
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usb_ep_regs[1].in.status = USB_EP_TYPE_ISOC; /* Type=Isochronous, single buffered */
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/* EP2 IN: Prepare two buffers */
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usb_ep_regs[2].in.bd[0].ptr = 1024;
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usb_ep_regs[2].in.bd[0].csr = 0;
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usb_ep_regs[2].in.bd[1].ptr = 1536;
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usb_ep_regs[2].in.bd[1].csr = 0;
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/* EP1 OUT: Queue two buffers */
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usb_ep_regs[1].out.bd[0].ptr = 1024;
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usb_ep_regs[1].out.bd[0].csr = USB_BD_STATE_RDY_DATA | USB_BD_LEN(388);
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usb_ep_regs[1].out.bd[1].ptr = 1536;
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usb_ep_regs[1].out.bd[1].csr = USB_BD_STATE_RDY_DATA | USB_BD_LEN(388);
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/* EP1 IN: Queue buffer */
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_usb_fill_feedback_ep();
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return USB_FND_SUCCESS;
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}
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2020-12-14 12:48:09 +00:00
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static enum usb_fnd_resp
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2020-09-14 08:22:29 +00:00
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_e1_get_intf(const struct usb_intf_desc *base, uint8_t *alt)
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{
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if (base->bInterfaceNumber != 0)
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return USB_FND_CONTINUE;
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*alt = g_usb_e1.running ? 1 : 0;
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return USB_FND_SUCCESS;
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}
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static struct usb_fn_drv _e1_drv = {
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.set_conf = _e1_set_conf,
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.set_intf = _e1_set_intf,
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.get_intf = _e1_get_intf,
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};
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void
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usb_e1_init(void)
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{
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memset(&g_usb_e1, 0x00, sizeof(g_usb_e1));
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usb_register_function_driver(&_e1_drv);
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}
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