251 lines
6.3 KiB
C
251 lines
6.3 KiB
C
/*
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* This file is part of the libopenstm32 project.
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*
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* Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopenstm32/common.h>
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#include <libopenstm32/tools.h>
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#include <libopenstm32/usb.h>
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#include <usb/usbd.h>
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#include "usb_private.h"
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/** Initialize USB Device Controller.
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*
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* Function initializes the USB Device controller hardware
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* of the STM32 microcontroller.
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*/
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void _usbd_hw_init(void)
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{
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SET_REG(USB_CNTR_REG, 0);
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SET_REG(USB_BTABLE_REG, 0);
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SET_REG(USB_ISTR_REG, 0);
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/* Enable RESET, SUSPEND, RESUME and CTR interrupts */
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SET_REG(USB_CNTR_REG, USB_CNTR_RESETM | USB_CNTR_CTRM |
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USB_CNTR_SUSPM | USB_CNTR_WKUPM);
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}
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void _usbd_hw_set_address(u8 addr)
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{
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/* Set device address and enable. */
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SET_REG(USB_DADDR_REG, (addr & USB_DADDR_ADDR) | USB_DADDR_ENABLE);
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}
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/** Set the receive buffer size for a given USB endpoint
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* @param ep Index of Endpoint to configure
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* @param addr Size in bytes of RX buffer
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*/
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static void usb_set_ep_rx_bufsize(u8 ep, u32 size)
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{
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if(size > 62) {
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if(size & 0x1f) size -= 32;
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USB_SET_EP_RX_COUNT(ep, (size << 5) | 0x8000);
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} else {
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if(size & 1) size++;
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USB_SET_EP_RX_COUNT(ep, size << 10);
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}
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}
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void usbd_ep_setup(u8 addr, u8 type, u16 max_size, void (*callback)(u8 ep))
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{
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/* Translate USB standard type codes to stm32 */
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const u16 typelookup[] = {
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[USB_ENDPOINT_ATTR_CONTROL] = USB_EP_TYPE_CONTROL,
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[USB_ENDPOINT_ATTR_ISOCHRONOUS] = USB_EP_TYPE_ISO,
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[USB_ENDPOINT_ATTR_BULK] = USB_EP_TYPE_BULK,
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[USB_ENDPOINT_ATTR_INTERRUPT] = USB_EP_TYPE_INTERRUPT,
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};
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u8 dir = addr & 0x80;
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addr &= 0x7f;
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/* Assign address */
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USB_SET_EP_ADDR(addr, addr);
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USB_SET_EP_TYPE(addr, typelookup[type]);
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if(dir || (addr == 0)) {
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USB_SET_EP_TX_ADDR(addr, _usbd_device.pm_top);
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if(callback)
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_usbd_device.user_callback_ctr[addr][USB_TRANSACTION_IN] = (void*)callback;
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USB_CLR_EP_TX_DTOG(addr);
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USB_SET_EP_TX_STAT(addr, USB_EP_TX_STAT_NAK);
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_usbd_device.pm_top += max_size;
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}
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if(!dir) {
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USB_SET_EP_RX_ADDR(addr, _usbd_device.pm_top);
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usb_set_ep_rx_bufsize(addr, max_size);
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if(callback)
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_usbd_device.user_callback_ctr[addr][USB_TRANSACTION_OUT] = (void*)callback;
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USB_CLR_EP_RX_DTOG(addr);
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USB_SET_EP_RX_STAT(addr, USB_EP_RX_STAT_VALID);
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_usbd_device.pm_top += max_size;
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}
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}
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void _usbd_hw_endpoints_reset(void)
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{
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int i;
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/* Reset all endpoints */
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for(i = 1; i < 8; i++) {
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USB_SET_EP_TX_STAT(i, USB_EP_TX_STAT_DISABLED);
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USB_SET_EP_RX_STAT(i, USB_EP_RX_STAT_DISABLED);
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}
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_usbd_device.pm_top = 0x40 + (2*_usbd_device.desc->bMaxPacketSize0);
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}
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void usbd_ep_stall_set(u8 addr, u8 stall)
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{
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if(addr == 0)
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USB_SET_EP_TX_STAT(addr,
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stall ? USB_EP_TX_STAT_STALL : USB_EP_TX_STAT_NAK);
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if(addr & 0x80) {
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addr &= 0x7F;
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USB_SET_EP_TX_STAT(addr,
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stall ? USB_EP_TX_STAT_STALL : USB_EP_TX_STAT_NAK);
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/* Reset to DATA0 if clearing stall condition */
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if(!stall)
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USB_CLR_EP_TX_DTOG(addr);
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} else {
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/* Reset to DATA0 if clearing stall condition */
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if(!stall)
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USB_CLR_EP_RX_DTOG(addr);
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USB_SET_EP_RX_STAT(addr,
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stall ? USB_EP_RX_STAT_STALL : USB_EP_RX_STAT_VALID);
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}
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}
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u8 usbd_ep_stall_get(u8 addr)
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{
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if(addr & 0x80) {
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if ((*USB_EP_REG(addr & 0x7F) & USB_EP_TX_STAT) ==
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USB_EP_TX_STAT_STALL)
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return 1;
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} else {
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if ((*USB_EP_REG(addr) & USB_EP_RX_STAT) ==
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USB_EP_RX_STAT_STALL)
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return 1;
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}
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return 0;
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}
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/** Copy a data buffer to Packet Memory.
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* @param PM Destination pointer into packet memory.
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* @param buf Source pointer to data buffer.
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* @param len Number of bytes to copy.
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*/
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static inline void
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usb_copy_to_pm(volatile void *vPM, const void *buf, u16 len)
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{
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const u16 *lbuf = buf;
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volatile u16 *PM = vPM;
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for(len = (len + 1) >> 1; len; PM += 2, lbuf++, len--)
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*PM = *lbuf;
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}
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u16 usbd_ep_write_packet(u8 addr, const void *buf, u16 len)
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{
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addr &= 0x7F;
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if((*USB_EP_REG(addr) & USB_EP_TX_STAT) == USB_EP_TX_STAT_VALID)
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return 0;
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usb_copy_to_pm(USB_GET_EP_TX_BUFF(addr), buf, len);
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USB_SET_EP_TX_COUNT(addr, len);
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USB_SET_EP_TX_STAT(addr, USB_EP_TX_STAT_VALID);
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return len;
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}
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/** Copy a data buffer from Packet Memory.
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* @param buf Source pointer to data buffer.
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* @param PM Destination pointer into packet memory.
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* @param len Number of bytes to copy.
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*/
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static inline void
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usb_copy_from_pm(void *buf, const volatile void *vPM, u16 len)
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{
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u16 *lbuf = buf;
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const volatile u16 *PM = vPM;
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u8 odd = len & 1;
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for(len >>= 1; len; PM += 2, lbuf++, len--)
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*lbuf = *PM;
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if(odd) *(u8*)lbuf = *(u8*)PM;
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}
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u16 usbd_ep_read_packet(u8 addr, void *buf, u16 len)
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{
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if((*USB_EP_REG(addr) & USB_EP_RX_STAT) == USB_EP_RX_STAT_VALID)
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return 0;
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len = MIN(USB_GET_EP_RX_COUNT(addr) & 0x3ff, len);
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usb_copy_from_pm(buf, USB_GET_EP_RX_BUFF(addr), len);
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USB_CLR_EP_RX_CTR(addr);
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USB_SET_EP_RX_STAT(addr, USB_EP_RX_STAT_VALID);
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return len;
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}
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void usbd_poll(void)
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{
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u16 istr = *USB_ISTR_REG;
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if(istr & USB_ISTR_RESET) {
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_usbd_device.pm_top = 0x40;
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_usbd_reset();
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USB_CLR_ISTR_RESET();
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return;
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}
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if(istr & USB_ISTR_CTR) {
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u8 ep = istr & USB_ISTR_EP_ID;
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u8 type = (istr & USB_ISTR_DIR) ? 1 : 0;
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if(type) { /* OUT or SETUP transaction */
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type += (*USB_EP_REG(ep) & USB_EP_SETUP) ? 1 : 0;
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} else { /* IN transaction */
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USB_CLR_EP_TX_CTR(ep);
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}
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if(_usbd_device.user_callback_ctr[ep][type])
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_usbd_device.user_callback_ctr[ep][type](ep);
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}
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if(istr & USB_ISTR_SUSP) {
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USB_CLR_ISTR_SUSP();
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if(_usbd_device.user_callback_suspend)
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_usbd_device.user_callback_suspend();
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}
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if(istr & USB_ISTR_WKUP) {
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USB_CLR_ISTR_WKUP();
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if(_usbd_device.user_callback_resume)
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_usbd_device.user_callback_resume();
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}
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if(istr & USB_ISTR_SOF)
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USB_CLR_ISTR_SOF();
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}
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