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- /** @addtogroup usb_file USB peripheral API
- * @ingroup peripheral_apis
- *
- * @sa usb_defines
- * @copyright See @ref lgpl_license
- */
- /*
- * This file is part of the libopencm3 project.
- *
- * Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz>
- * Copyright (C) 2015 Kuldeep Singh Dhaka <kuldeepdhaka9@gmail.com>
- *
- * This library is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #include <string.h>
- #include <libopencm3/cm3/common.h>
- #include <libopencm3/efm32/memorymap.h>
- #include <libopencm3/efm32/cmu.h>
- #include <libopencm3/efm32/usb.h>
- #include <libopencm3/usb/usbd.h>
- #include "usb_private.h"
-
- /**@{*/
-
- /* Receive FIFO size in 32-bit words. */
- #define RX_FIFO_SIZE 256
-
- /* FIME: EFM32LG have 6 bidirectonal-endpoint
- * problem is "uint32_t doeptsiz[4];" in usb_private.h
- * doeptsiz is fixed size of length 4,
- * if we it to be of length 6
- * possibly, same with "uint8_t force_nak[4];"
- *
- * solution: remove everything driver specific from usb_private.h
- * and move that to there specific driver files.
- * maybe a pointer to driver specific data will do the task. */
-
- #define ENDPOINT_COUNT 4
-
- static struct _usbd_device _usbd_dev;
-
- /** Initialize the USB_FS device controller hardware of the STM32. */
- static usbd_device *efm32lg_usbd_init(void)
- {
- /* Enable clock */
- CMU_HFCORECLKEN0 |= CMU_HFCORECLKEN0_USB | CMU_HFCORECLKEN0_USBC;
- CMU_CMD = CMU_CMD_USBCCLKSEL_HFCLKNODIV;
-
- /* wait till clock not selected */
- while (!(CMU_STATUS & CMU_STATUS_USBCHFCLKSEL));
-
- USB_GINTSTS = USB_GINTSTS_MMIS;
-
- USB_CTRL &= ~USB_CTRL_DMPUAP;
- USB_ROUTE = USB_ROUTE_DMPUPEN | USB_ROUTE_PHYPEN;
-
- /* Wait for AHB idle. */
- while (!(USB_GRSTCTL & USB_GRSTCTL_AHBIDL));
- /* Do core soft reset. */
- USB_GRSTCTL |= USB_GRSTCTL_CSRST;
- while (USB_GRSTCTL & USB_GRSTCTL_CSRST);
-
- /* Force peripheral only mode. */
- USB_GUSBCFG |= USB_GUSBCFG_FDMOD | USB_GUSBCFG_TRDT_16BIT;
-
- /* Full speed device. */
- USB_DCFG |= USB_DCFG_DSPD;
-
- /* Restart the PHY clock. */
- USB_PCGCCTL = 0;
-
- USB_GRXFSIZ = efm32lg_usb_driver.rx_fifo_size;
- _usbd_dev.fifo_mem_top = efm32lg_usb_driver.rx_fifo_size;
-
- /* Unmask interrupts for TX and RX. */
- USB_GAHBCFG |= USB_GAHBCFG_GLBLINTRMSK;
- USB_GINTMSK = USB_GINTMSK_ENUMDNEM |
- USB_GINTMSK_RXFLVLM |
- USB_GINTMSK_IEPINT |
- USB_GINTMSK_USBSUSPM |
- USB_GINTMSK_WUIM;
- USB_DAINTMSK = 0xF;
- USB_DIEPMSK = USB_DIEPMSK_XFRCM;
-
- return &_usbd_dev;
- }
-
- static void efm32lg_set_address(usbd_device *usbd_dev, uint8_t addr)
- {
- (void)usbd_dev;
-
- USB_DCFG = (USB_DCFG & ~USB_DCFG_DAD) | (addr << 4);
- }
-
- static void efm32lg_ep_setup(usbd_device *usbd_dev, uint8_t addr, uint8_t type,
- uint16_t max_size,
- void (*callback) (usbd_device *usbd_dev, uint8_t ep))
- {
- /*
- * Configure endpoint address and type. Allocate FIFO memory for
- * endpoint. Install callback function.
- */
- uint8_t dir = addr & 0x80;
- addr &= 0x7f;
-
- if (addr == 0) { /* For the default control endpoint */
- /* Configure IN part. */
- if (max_size >= 64) {
- USB_DIEP0CTL = USB_DIEP0CTL_MPSIZ_64;
- } else if (max_size >= 32) {
- USB_DIEP0CTL = USB_DIEP0CTL_MPSIZ_32;
- } else if (max_size >= 16) {
- USB_DIEP0CTL = USB_DIEP0CTL_MPSIZ_16;
- } else {
- USB_DIEP0CTL = USB_DIEP0CTL_MPSIZ_8;
- }
-
- USB_DIEP0TSIZ =
- (max_size & USB_DIEP0TSIZ_XFRSIZ_MASK);
- USB_DIEP0CTL |=
- USB_DIEP0CTL_EPENA | USB_DIEP0CTL_SNAK;
-
- /* Configure OUT part. */
- usbd_dev->doeptsiz[0] = USB_DIEP0TSIZ_STUPCNT_1 |
- USB_DIEP0TSIZ_PKTCNT |
- (max_size & USB_DIEP0TSIZ_XFRSIZ_MASK);
- USB_DOEPx_TSIZ(0) = usbd_dev->doeptsiz[0];
- USB_DOEPx_CTL(0) |=
- USB_DOEP0CTL_EPENA | USB_DIEP0CTL_SNAK;
-
- USB_GNPTXFSIZ = ((max_size / 4) << 16) |
- usbd_dev->driver->rx_fifo_size;
- usbd_dev->fifo_mem_top += max_size / 4;
- usbd_dev->fifo_mem_top_ep0 = usbd_dev->fifo_mem_top;
-
- return;
- }
-
- if (dir) {
- USB_DIEPTXF(addr) = ((max_size / 4) << 16) |
- usbd_dev->fifo_mem_top;
- usbd_dev->fifo_mem_top += max_size / 4;
-
- USB_DIEPx_TSIZ(addr) =
- (max_size & USB_DIEP0TSIZ_XFRSIZ_MASK);
- USB_DIEPx_CTL(addr) |=
- USB_DIEP0CTL_EPENA | USB_DIEP0CTL_SNAK | (type << 18)
- | USB_DIEP0CTL_USBAEP | USB_DIEP0CTL_SD0PID
- | (addr << 22) | max_size;
-
- if (callback) {
- usbd_dev->user_callback_ctr[addr][USB_TRANSACTION_IN] =
- (void *)callback;
- }
- }
-
- if (!dir) {
- usbd_dev->doeptsiz[addr] = USB_DIEP0TSIZ_PKTCNT |
- (max_size & USB_DIEP0TSIZ_XFRSIZ_MASK);
- USB_DOEPx_TSIZ(addr) = usbd_dev->doeptsiz[addr];
- USB_DOEPx_CTL(addr) |= USB_DOEP0CTL_EPENA |
- USB_DOEP0CTL_USBAEP | USB_DIEP0CTL_CNAK |
- USB_DOEP0CTL_SD0PID | (type << 18) | max_size;
-
- if (callback) {
- usbd_dev->user_callback_ctr[addr][USB_TRANSACTION_OUT] =
- (void *)callback;
- }
- }
- }
-
- static void efm32lg_endpoints_reset(usbd_device *usbd_dev)
- {
- /* The core resets the endpoints automatically on reset. */
- usbd_dev->fifo_mem_top = usbd_dev->fifo_mem_top_ep0;
- }
-
- static void efm32lg_ep_stall_set(usbd_device *usbd_dev, uint8_t addr,
- uint8_t stall)
- {
- (void)usbd_dev;
- if (addr == 0) {
- if (stall) {
- USB_DIEPx_CTL(addr) |= USB_DIEP0CTL_STALL;
- } else {
- USB_DIEPx_CTL(addr) &= ~USB_DIEP0CTL_STALL;
- }
- }
-
- if (addr & 0x80) {
- addr &= 0x7F;
-
- if (stall) {
- USB_DIEPx_CTL(addr) |= USB_DIEP0CTL_STALL;
- } else {
- USB_DIEPx_CTL(addr) &= ~USB_DIEP0CTL_STALL;
- USB_DIEPx_CTL(addr) |= USB_DIEP0CTL_SD0PID;
- }
- } else {
- if (stall) {
- USB_DOEPx_CTL(addr) |= USB_DOEP0CTL_STALL;
- } else {
- USB_DOEPx_CTL(addr) &= ~USB_DOEP0CTL_STALL;
- USB_DOEPx_CTL(addr) |= USB_DOEP0CTL_SD0PID;
- }
- }
- }
-
- static uint8_t efm32lg_ep_stall_get(usbd_device *usbd_dev, uint8_t addr)
- {
- (void)usbd_dev;
-
- /* Return non-zero if STALL set. */
- if (addr & 0x80) {
- return (USB_DIEPx_CTL(addr & 0x7f) &
- USB_DIEP0CTL_STALL) ? 1 : 0;
- } else {
- return (USB_DOEPx_CTL(addr) &
- USB_DOEP0CTL_STALL) ? 1 : 0;
- }
- }
-
- static void efm32lg_ep_nak_set(usbd_device *usbd_dev, uint8_t addr, uint8_t nak)
- {
- /* It does not make sence to force NAK on IN endpoints. */
- if (addr & 0x80) {
- return;
- }
-
- usbd_dev->force_nak[addr] = nak;
-
- if (nak) {
- USB_DOEPx_CTL(addr) |= USB_DOEP0CTL_SNAK;
- } else {
- USB_DOEPx_CTL(addr) |= USB_DOEP0CTL_CNAK;
- }
- }
-
- static uint16_t efm32lg_ep_write_packet(usbd_device *usbd_dev, uint8_t addr,
- const void *buf, uint16_t len)
- {
- (void)usbd_dev;
- const uint32_t *buf32 = buf;
- int i;
-
- addr &= 0x7F;
-
- /* Return if endpoint is already enabled. */
- if (USB_DIEPx_TSIZ(addr) & USB_DIEP0TSIZ_PKTCNT) {
- return 0;
- }
-
- /* Enable endpoint for transmission. */
- USB_DIEPx_TSIZ(addr) = USB_DIEP0TSIZ_PKTCNT | len;
- USB_DIEPx_CTL(addr) |= USB_DIEP0CTL_EPENA |
- USB_DIEP0CTL_CNAK;
- volatile uint32_t *fifo = USB_FIFOxD(addr);
-
- /* Copy buffer to endpoint FIFO, note - memcpy does not work */
- for (i = len; i > 0; i -= 4) {
- *fifo++ = *buf32++;
- }
-
- return len;
- }
-
- static uint16_t efm32lg_ep_read_packet(usbd_device *usbd_dev, uint8_t addr,
- void *buf, uint16_t len)
- {
- int i;
- uint32_t *buf32 = buf;
- uint32_t extra;
-
- len = MIN(len, usbd_dev->rxbcnt);
- usbd_dev->rxbcnt -= len;
-
- volatile uint32_t *fifo = USB_FIFOxD(addr);
- for (i = len; i >= 4; i -= 4) {
- *buf32++ = *fifo++;
- }
-
- if (i) {
- extra = *fifo++;
- memcpy(buf32, &extra, i);
- }
-
- USB_DOEPx_TSIZ(addr) = usbd_dev->doeptsiz[addr];
- USB_DOEPx_CTL(addr) |= USB_DOEP0CTL_EPENA |
- (usbd_dev->force_nak[addr] ?
- USB_DOEP0CTL_SNAK : USB_DOEP0CTL_CNAK);
-
- return len;
- }
-
- static void efm32lg_poll(usbd_device *usbd_dev)
- {
- /* Read interrupt status register. */
- uint32_t intsts = USB_GINTSTS;
- int i;
-
- if (intsts & USB_GINTSTS_ENUMDNE) {
- /* Handle USB RESET condition. */
- USB_GINTSTS = USB_GINTSTS_ENUMDNE;
- usbd_dev->fifo_mem_top = usbd_dev->driver->rx_fifo_size;
- _usbd_reset(usbd_dev);
- return;
- }
-
- /* Note: RX and TX handled differently in this device. */
- if (intsts & USB_GINTSTS_RXFLVL) {
- /* Receive FIFO non-empty. */
- uint32_t rxstsp = USB_GRXSTSP;
- uint32_t pktsts = rxstsp & USB_GRXSTSP_PKTSTS_MASK;
- if ((pktsts != USB_GRXSTSP_PKTSTS_OUT) &&
- (pktsts != USB_GRXSTSP_PKTSTS_SETUP)) {
- return;
- }
-
- uint8_t ep = rxstsp & USB_GRXSTSP_EPNUM_MASK;
- uint8_t type;
- if (pktsts == USB_GRXSTSP_PKTSTS_SETUP) {
- type = USB_TRANSACTION_SETUP;
- } else {
- type = USB_TRANSACTION_OUT;
- }
-
- /* Save packet size for stm32f107_ep_read_packet(). */
- usbd_dev->rxbcnt = (rxstsp & USB_GRXSTSP_BCNT_MASK) >> 4;
-
- /*
- * FIXME: Why is a delay needed here?
- * This appears to fix a problem where the first 4 bytes
- * of the DATA OUT stage of a control transaction are lost.
- */
- for (i = 0; i < 1000; i++) {
- __asm__("nop");
- }
-
- if (usbd_dev->user_callback_ctr[ep][type]) {
- usbd_dev->user_callback_ctr[ep][type] (usbd_dev, ep);
- }
-
- /* Discard unread packet data. */
- for (i = 0; i < usbd_dev->rxbcnt; i += 4) {
- (void)*USB_FIFOxD(ep);
- }
-
- usbd_dev->rxbcnt = 0;
- }
-
- /*
- * There is no global interrupt flag for transmit complete.
- * The XFRC bit must be checked in each USB_DIEPx_INT(x).
- */
- for (i = 0; i < ENDPOINT_COUNT; i++) { /* Iterate over endpoints. */
- if (USB_DIEPx_INT(i) & USB_DIEP_INT_XFRC) {
- /* Transfer complete. */
- if (usbd_dev->user_callback_ctr[i]
- [USB_TRANSACTION_IN]) {
- usbd_dev->user_callback_ctr[i]
- [USB_TRANSACTION_IN](usbd_dev, i);
- }
-
- USB_DIEPx_INT(i) = USB_DIEP_INT_XFRC;
- }
- }
-
- if (intsts & USB_GINTSTS_USBSUSP) {
- if (usbd_dev->user_callback_suspend) {
- usbd_dev->user_callback_suspend();
- }
- USB_GINTSTS = USB_GINTSTS_USBSUSP;
- }
-
- if (intsts & USB_GINTSTS_WKUPINT) {
- if (usbd_dev->user_callback_resume) {
- usbd_dev->user_callback_resume();
- }
- USB_GINTSTS = USB_GINTSTS_WKUPINT;
- }
-
- if (intsts & USB_GINTSTS_SOF) {
- if (usbd_dev->user_callback_sof) {
- usbd_dev->user_callback_sof();
- }
- USB_GINTSTS = USB_GINTSTS_SOF;
- }
-
- if (usbd_dev->user_callback_sof) {
- USB_GINTMSK |= USB_GINTMSK_SOFM;
- } else {
- USB_GINTMSK &= ~USB_GINTMSK_SOFM;
- }
- }
-
- static void efm32lg_disconnect(usbd_device *usbd_dev, bool disconnected)
- {
- (void)usbd_dev;
-
- if (disconnected) {
- USB_DCTL |= USB_DCTL_SDIS;
- } else {
- USB_DCTL &= ~USB_DCTL_SDIS;
- }
- }
-
- const struct _usbd_driver efm32lg_usb_driver = {
- .init = efm32lg_usbd_init,
- .set_address = efm32lg_set_address,
- .ep_setup = efm32lg_ep_setup,
- .ep_reset = efm32lg_endpoints_reset,
- .ep_stall_set = efm32lg_ep_stall_set,
- .ep_stall_get = efm32lg_ep_stall_get,
- .ep_nak_set = efm32lg_ep_nak_set,
- .ep_write_packet = efm32lg_ep_write_packet,
- .ep_read_packet = efm32lg_ep_read_packet,
- .poll = efm32lg_poll,
- .disconnect = efm32lg_disconnect,
- .base_address = USB_BASE,
- .set_address_before_status = 1,
- .rx_fifo_size = RX_FIFO_SIZE,
- };
-
- /**@}*/
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