209 lines
4.8 KiB
C
209 lines
4.8 KiB
C
/* MSPDebug - debugging tool for the eZ430
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* Copyright (C) 2009, 2010 Daniel Beer
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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 2 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, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <string.h>
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#include <usb.h>
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#include "transport.h"
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#include "util.h"
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/*********************************************************************
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* USB transport
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*
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* These functions handle the details of slicing data over USB
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* transfers. The interface presented is a continuous byte stream with
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* no slicing codes.
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*
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* Writes are unbuffered -- a single write translates to at least
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* one transfer.
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*/
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#define USB_FET_VENDOR 0x0451
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#define USB_FET_PRODUCT 0xf432
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#define USB_FET_INTERFACE_CLASS 3
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#define USB_FET_IN_EP 0x81
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#define USB_FET_OUT_EP 0x01
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static int usbtr_int_number;
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static struct usb_dev_handle *usbtr_handle;
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static int usbtr_open_interface(struct usb_device *dev, int ino)
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{
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printf("Trying to open interface %d on %s\n", ino, dev->filename);
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usbtr_int_number = ino;
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usbtr_handle = usb_open(dev);
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if (!usbtr_handle) {
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perror("rf2500: can't open device");
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return -1;
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}
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if (usb_detach_kernel_driver_np(usbtr_handle, usbtr_int_number) < 0)
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perror("rf2500: warning: can't "
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"detach kernel driver");
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if (usb_claim_interface(usbtr_handle, usbtr_int_number) < 0) {
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perror("rf2500: can't claim interface");
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usb_close(usbtr_handle);
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return -1;
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}
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return 0;
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}
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static int usbtr_open_device(struct usb_device *dev)
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{
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struct usb_config_descriptor *c = &dev->config[0];
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int i;
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for (i = 0; i < c->bNumInterfaces; i++) {
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struct usb_interface *intf = &c->interface[i];
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struct usb_interface_descriptor *desc = &intf->altsetting[0];
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if (desc->bInterfaceClass == USB_FET_INTERFACE_CLASS &&
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!usbtr_open_interface(dev, desc->bInterfaceNumber))
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return 0;
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}
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return -1;
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}
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static int usbtr_send(const u_int8_t *data, int len)
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{
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while (len) {
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u_int8_t pbuf[256];
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int plen = len > 255 ? 255 : len;
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int txlen = plen + 1;
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memcpy(pbuf + 1, data, plen);
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/* This padding is needed to work around an apparent bug in
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* the RF2500 FET. Without this, the device hangs.
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*/
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if (txlen > 32 && (txlen & 0x3f))
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while (txlen < 255 && (txlen & 0x3f))
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pbuf[txlen++] = 0xff;
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else if (txlen > 16 && (txlen & 0xf))
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while (txlen < 255 && (txlen & 0xf) != 1)
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pbuf[txlen++] = 0xff;
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pbuf[0] = txlen - 1;
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#ifdef DEBUG_USBTR
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puts("USB transfer out:");
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hexdump(0, pbuf, txlen);
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#endif
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if (usb_bulk_write(usbtr_handle, USB_FET_OUT_EP,
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(const char *)pbuf, txlen, 10000) < 0) {
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perror("rf2500: can't send data");
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return -1;
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}
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data += plen;
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len -= plen;
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}
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return 0;
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}
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static u_int8_t usbtr_buf[64];
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static int usbtr_len;
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static int usbtr_offset;
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static int usbtr_flush(void)
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{
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char buf[64];
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while (usb_bulk_read(usbtr_handle, USB_FET_IN_EP,
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buf, sizeof(buf), 100) >= 0);
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return 0;
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}
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static int usbtr_recv(u_int8_t *databuf, int max_len)
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{
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int rlen;
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if (usbtr_offset >= usbtr_len) {
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if (usb_bulk_read(usbtr_handle, USB_FET_IN_EP,
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(char *)usbtr_buf, sizeof(usbtr_buf),
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10000) < 0) {
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perror("rf2500: can't receive data");
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return -1;
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}
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#ifdef DEBUG_USBTR
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puts("USB transfer in:");
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hexdump(0, usbtr_buf, 64);
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#endif
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usbtr_len = usbtr_buf[1] + 2;
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if (usbtr_len > sizeof(usbtr_buf))
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usbtr_len = sizeof(usbtr_buf);
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usbtr_offset = 2;
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}
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rlen = usbtr_len - usbtr_offset;
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if (rlen > max_len)
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rlen = max_len;
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memcpy(databuf, usbtr_buf + usbtr_offset, rlen);
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usbtr_offset += rlen;
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return rlen;
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}
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static void usbtr_close(void)
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{
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usb_release_interface(usbtr_handle, usbtr_int_number);
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usb_close(usbtr_handle);
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}
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static const struct fet_transport usbtr_transport = {
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.flush = usbtr_flush,
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.send = usbtr_send,
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.recv = usbtr_recv,
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.close = usbtr_close
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};
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const struct fet_transport *rf2500_open(void)
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{
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struct usb_bus *bus;
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usb_init();
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usb_find_busses();
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usb_find_devices();
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for (bus = usb_get_busses(); bus; bus = bus->next) {
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struct usb_device *dev;
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for (dev = bus->devices; dev; dev = dev->next) {
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if (dev->descriptor.idVendor == USB_FET_VENDOR &&
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dev->descriptor.idProduct == USB_FET_PRODUCT &&
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!usbtr_open_device(dev)) {
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usbtr_flush();
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return &usbtr_transport;
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}
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}
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}
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fprintf(stderr, "rf2500: no devices could be found\n");
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return NULL;
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}
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