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nyawn |
/* cable_usbblaster_ftdi.c - Alternate, libFTDI-based Altera USB Blaster driver
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for the Advanced JTAG Bridge. Originally by Xianfeng Zheng.
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Copyright (C) 2009 Xianfeng Zeng
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2009 - 2010 Nathan Yawn, nathan.yawn@opencores.org
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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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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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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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include <sys/types.h>
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#include <unistd.h> // for usleep()
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#include <stdlib.h> // for sleep()
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#include <arpa/inet.h> // for htons()
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#include <sys/time.h>
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#include <time.h>
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#include <string.h>
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#include "ftdi.h" // libftdi header
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#include "cable_ft245.h"
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#include "errcodes.h"
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#define debug(...) //fprintf(stderr, __VA_ARGS__ )
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jtag_cable_t ft245_cable_driver = {
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.name = "ft245",
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.inout_func = cable_ft245_inout,
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.out_func = cable_ft245_out,
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.init_func =cable_ft245_init ,
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.opt_func = cable_ft245_opt,
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.bit_out_func = cable_common_write_bit,
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.bit_inout_func = cable_common_read_write_bit,
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#if 1
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.stream_out_func = cable_ft245_write_stream ,
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.stream_inout_func = cable_ft245_read_stream,
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#else
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.stream_out_func = cable_common_write_stream ,
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.stream_inout_func = cable_common_read_stream,
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#endif
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.flush_func = NULL,
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.opts = "",
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.help = "no options\n",
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};
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// USBBlaster has a max. single transaction of 63 bytes. We assume
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// the FT245 has the same limit.
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// So, size the max read and write to create 64-byte USB packets
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#define USBBLASTER_MAX_WRITE 63
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static uint8_t data_out_scratchpad[USBBLASTER_MAX_WRITE+1];
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#define USBBLASTER_MAX_READ 62
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static uint8_t data_in_scratchpad[USBBLASTER_MAX_READ+2];
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// USB constants for the USB Blaster
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#define ALTERA_VID 0x09FB
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#define ALTERA_PID 0x6001
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static struct ftdi_context ftdic;
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///////////////////////////////////////////////////////////////////////////////
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/*-------------------------------------[ USB Blaster specific functions ]---*/
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/////////////////////////////////////////////////////////////////////////////
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//
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// libusb does not work with my 3C25, but it works with libfdti.
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// Following code is ported from http://www.ixo.de/info/usb_jtag/
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// ZXF, 2009-10-22
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//
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int usb_blaster_buf_write(uint8_t *buf, int size, uint32_t* bytes_written)
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{
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int retval;
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debug("ft245 usb_blaster_buf_write %02X (%d)\n", buf[0], size);
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if ((retval = ftdi_write_data(&ftdic, buf, size)) < 0) {
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*bytes_written = 0;
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printf("ftdi_write_data: %s\n", ftdi_get_error_string(&ftdic));
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return -1;
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} else {
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*bytes_written = retval;
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return 0;
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}
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}
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int usb_blaster_buf_read(uint8_t* buf, int size, uint32_t* bytes_read)
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{
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int retval;
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int timeout = 100;
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*bytes_read = 0;
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while ((*bytes_read < size) && timeout--) {
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if ((retval = ftdi_read_data(&ftdic, buf + *bytes_read, size - *bytes_read)) < 0) {
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*bytes_read = 0;
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printf("ftdi_read_data: %s\n", ftdi_get_error_string(&ftdic));
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return -1;
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}
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*bytes_read += retval;
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}
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debug("ft245 usb_blaster_buf_read %02X (%d)\n", buf[0], *bytes_read);
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return 0;
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}
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/* The following code doesn't fully utilize the possibilities of the USB-Blaster. It
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* writes one byte per JTAG pin state change at a time; it doesn't even try to buffer
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* data up to the maximum packet size of 64 bytes.
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*
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* The USB-Blaster offers a byte-shift mode to transmit up to 504 data bits
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* (bidirectional) in a single USB packet. A header byte has to be sent as the first
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* byte in a packet with the following meaning:
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*
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* Bit 7 (0x80): Must be set to indicate byte-shift mode.
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* Bit 6 (0x40): If set, the USB-Blaster will also read data, not just write.
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* Bit 5..0: Define the number N of following bytes
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*
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* All N following bytes will then be clocked out serially on TDI. If Bit 6 was set,
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* it will afterwards return N bytes with TDO data read while clocking out the TDI data.
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* LSB of the first byte after the header byte will appear first on TDI.
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*/
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/* Simple bit banging mode:
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*
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* Bit 7 (0x80): Must be zero (see byte-shift mode above)
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* Bit 6 (0x40): If set, you will receive a byte indicating the state of TDO in return.
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* Bit 5 (0x20): Unknown; for now, set to one.
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* Bit 4 (0x10): TDI Output.
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* Bit 3 (0x08): Unknown; for now, set to one.
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* Bit 2 (0x04): Unknown; for now, set to one.
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* Bit 1 (0x02): TMS Output.
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* Bit 0 (0x01): TCK Output.
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*
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* For transmitting a single data bit, you need to write two bytes. Up to 64 bytes can be
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* combined in a single USB packet (but this is not done in the code below). It isn't
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* possible to read a data without transmitting data.
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*/
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#define FTDI_TCK 0
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#define FTDI_TMS 1
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#define FTDI_TDI 4
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#define FTDI_READ 6
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#define FTDI_SHMODE 7
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#define FTDI_OTHERS ((1<<2)|(1<<3)|(1<<5))
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void usb_blaster_write(int tck, int tms, int tdi)
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{
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uint8_t buf[1];
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uint32_t count;
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debug("---- usb_blaster_write(%d,%d,%d)\n", tck,tms,tdi);
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buf[0] = FTDI_OTHERS | (tck?(1<<FTDI_TCK):0) | (tms?(1<<FTDI_TMS):0) | (tdi?(1<<FTDI_TDI):0);
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usb_blaster_buf_write(buf, 1, &count);
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}
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int usb_blaster_write_read(int tck, int tms, int tdi)
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{
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uint8_t buf[1];
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uint32_t count;
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debug("++++ usb_blaster_write_read(%d,%d,%d)\n", tck,tms,tdi);
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buf[0] = FTDI_OTHERS | (tck?(1<<FTDI_TCK):0) | (tms?(1<<FTDI_TMS):0) | (tdi?(1<<FTDI_TDI):0) | (1<<FTDI_READ);
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usb_blaster_buf_write(buf, 1, &count);
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usb_blaster_buf_read(buf, 1, &count);
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return (buf[0]&1);
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}
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int usb_blaster_speed(int speed)
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{
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if(ftdi_set_baudrate(&ftdic, speed)<0) {
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printf("Can't set baud rate to max: %s\n", ftdi_get_error_string(&ftdic));
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return -1;
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}
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return 0;
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}
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int ftdi_usb_blaster_quit(void)
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{
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ftdi_usb_close(&ftdic);
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ftdi_deinit(&ftdic);
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return 0;
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}
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// ---------- adv_jtag_bridge interface functions ------------------
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// The stream functions below *do* use the full potential of the FT245
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// USB-Blaster. Up 63 bytes can be written in a single USB transaction,
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// and 62 can be read back. It's possible that libFTDI can handle arbitrary-
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// sized writes, but we break up reads and writes into single-transaction
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// chunks here.
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//
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// The usbblaster transfers the bits in the stream in the following order:
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// bit 0 of the first byte received ... bit 7 of the first byte received
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// bit 0 of second byte received ... etc.
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int cable_ft245_write_stream(uint32_t *stream, int len_bits, int set_last_bit) {
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int rv; // to catch return values of functions
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uint32_t count;
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unsigned int bytes_to_transfer, leftover_bit_length;
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uint32_t leftover_bits;
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int bytes_remaining;
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char *xfer_ptr;
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int err = APP_ERR_NONE;
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debug("cable_ft245_write_stream(0x%X, %d, %i)\n", stream, len, set_last_bit);
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// This routine must transfer at least 8 bits. Additionally, TMS (the last bit)
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// cannot be set by 'byte shift mode'. So we need at least 8 bits to transfer,
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// plus one bit to send along with TMS.
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bytes_to_transfer = len_bits / 8;
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leftover_bit_length = len_bits - (bytes_to_transfer * 8);
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if((!leftover_bit_length) && set_last_bit) {
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bytes_to_transfer -= 1;
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leftover_bit_length += 8;
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}
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debug("bytes_to_transfer: %d. leftover_bit_length: %d\n", bytes_to_transfer, leftover_bit_length);
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// Not enough bits for high-speed transfer. bit-bang.
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if(bytes_to_transfer == 0) {
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return cable_common_write_stream(stream, len_bits, set_last_bit);
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}
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// Bitbang functions leave clock high. USBBlaster assumes clock low at the start of a burst.
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err |= cable_ft245_out(0); // Lower the clock.
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// Set leftover bits
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leftover_bits = (stream[bytes_to_transfer>>2] >> ((bytes_to_transfer & 0x3) * 8)) & 0xFF;
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debug("leftover_bits: 0x%X, LSB_first_xfer = %d\n", leftover_bits, LSB_first_xfer);
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bytes_remaining = bytes_to_transfer;
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xfer_ptr = (char *) stream;
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while(bytes_remaining > 0)
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{
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int bytes_this_xfer = (bytes_remaining > USBBLASTER_MAX_WRITE) ? USBBLASTER_MAX_WRITE:bytes_remaining;
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data_out_scratchpad[0] = (1<<FTDI_SHMODE) | (bytes_this_xfer & 0x3F);
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memcpy(&data_out_scratchpad[1], xfer_ptr, bytes_this_xfer);
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/* printf("Data packet: ");
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for(i = 0; i <= bytes_to_transfer; i++)
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printf("0x%X ", out[i]);
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printf("\n"); */
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rv = usb_blaster_buf_write(data_out_scratchpad, bytes_this_xfer+1, &count);
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if (count != (bytes_this_xfer+1)){
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fprintf(stderr, "\nFailed to write to the FIFO (count = %d)", rv);
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err |= APP_ERR_USB;
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break;
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}
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bytes_remaining -= bytes_this_xfer;
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xfer_ptr += bytes_this_xfer;
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}
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// if we have a number of bits not divisible by 8, or we need to set TMS...
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if(leftover_bit_length != 0) {
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//printf("Doing leftovers: (0x%X, %d, %d)\n", leftover_bits, leftover_bit_length, set_last_bit);
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return cable_common_write_stream(&leftover_bits, leftover_bit_length, set_last_bit);
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}
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return err;
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}
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int cable_ft245_read_stream(uint32_t *outstream, uint32_t *instream, int len_bits, int set_last_bit) {
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int rv; // to catch return values of functions
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uint32_t count;
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unsigned int bytes_received = 0, total_bytes_received = 0;
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unsigned int bytes_to_transfer, leftover_bit_length;
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uint32_t leftover_bits, leftovers_received = 0;
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unsigned char i;
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int bytes_remaining;
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char *xfer_ptr;
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int retval = APP_ERR_NONE;
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debug("cable_usbblaster_read_stream(0x%X, %d, %i)\n", outstream[0], len_bits, set_last_bit);
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// This routine must transfer at least 8 bits. Additionally, TMS (the last bit)
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// cannot be set by 'byte shift mode'. So we need at least 8 bits to transfer,
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// plus one bit to send along with TMS.
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bytes_to_transfer = len_bits / 8;
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leftover_bit_length = len_bits - (bytes_to_transfer * 8);
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if((!leftover_bit_length) && set_last_bit) {
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bytes_to_transfer -= 1;
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leftover_bit_length += 8;
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}
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debug("RD bytes_to_transfer: %d. leftover_bit_length: %d\n", bytes_to_transfer, leftover_bit_length);
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// Not enough bits for high-speed transfer. bit-bang.
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if(bytes_to_transfer == 0) {
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return cable_common_read_stream(outstream, instream, len_bits, set_last_bit);
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}
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// Bitbang functions leave clock high. USBBlaster assumes clock low at the start of a burst.
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// Lower the clock.
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retval |= cable_ft245_out(0);
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// Zero the input, since we add new data by logical-OR
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for(i = 0; i < (len_bits/32); i++) instream[i] = 0;
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if(len_bits % 32) instream[i] = 0;
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// Set leftover bits
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leftover_bits = (outstream[bytes_to_transfer>>2] >> ((bytes_to_transfer & 0x3) * 8)) & 0xFF;
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debug("leftover_bits: 0x%X\n", leftover_bits);
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324 |
|
|
// Transfer the data. USBBlaster has a max transfer size of 64 bytes.
|
325 |
|
|
bytes_remaining = bytes_to_transfer;
|
326 |
|
|
xfer_ptr = (char *) outstream;
|
327 |
|
|
total_bytes_received = 0;
|
328 |
|
|
while(bytes_remaining > 0)
|
329 |
|
|
{
|
330 |
|
|
int bytes_this_xfer = (bytes_remaining > USBBLASTER_MAX_READ) ? USBBLASTER_MAX_READ:bytes_remaining;
|
331 |
|
|
data_out_scratchpad[0] = (1<<FTDI_SHMODE) | (1<<FTDI_READ) | (bytes_this_xfer & 0x3F);
|
332 |
|
|
memcpy(&data_out_scratchpad[1], xfer_ptr, bytes_this_xfer);
|
333 |
|
|
|
334 |
|
|
/* debug("Data packet: ");
|
335 |
|
|
for(i = 0; i <= bytes_to_transfer; i++) debug("0x%X ", data_out_scratchpad[i]);
|
336 |
|
|
debug("\n"); */
|
337 |
|
|
|
338 |
|
|
rv = usb_blaster_buf_write(data_out_scratchpad, bytes_this_xfer+1, &count);
|
339 |
|
|
if (count != (bytes_this_xfer+1)){
|
340 |
|
|
fprintf(stderr, "\nFailed to write to the EP2 FIFO (count = %d)\n", count);
|
341 |
|
|
return APP_ERR_USB;
|
342 |
|
|
}
|
343 |
|
|
|
344 |
|
|
// receive the response
|
345 |
|
|
// libFTDI removes the excess 0x31 0x60 chars for us.
|
346 |
|
|
int retries = 0;
|
347 |
|
|
bytes_received = 0;
|
348 |
|
|
do {
|
349 |
|
|
debug("stream read, bytes_this_xfer = %i, bytes_received = %i\n", bytes_this_xfer, bytes_received);
|
350 |
|
|
rv = usb_blaster_buf_read(data_in_scratchpad, (bytes_this_xfer-bytes_received), &count);
|
351 |
|
|
if (rv < 0){
|
352 |
|
|
fprintf(stderr, "\nFailed to read stream from the EP1 FIFO (%i)\n", rv);
|
353 |
|
|
return APP_ERR_USB;
|
354 |
|
|
}
|
355 |
|
|
|
356 |
|
|
/* debug("Read %i bytes: ", rv);
|
357 |
|
|
for(i = 0; i < rv; i++)
|
358 |
|
|
debug("0x%X ", data_in_scratchpad[i]);
|
359 |
|
|
debug("\n"); */
|
360 |
|
|
|
361 |
|
|
if(count > 0) retries = 0;
|
362 |
|
|
else retries++;
|
363 |
|
|
|
364 |
|
|
/* Put the received bytes into the return stream. Works for either endian. */
|
365 |
|
|
for(i = 0; i < count; i++) {
|
366 |
|
|
// Do size/type promotion before shift. Must cast to unsigned, else the value may be
|
367 |
|
|
// sign-extended through the upper 16 bits of the uint32_t.
|
368 |
|
|
uint32_t tmp = (unsigned char) data_in_scratchpad[i];
|
369 |
|
|
instream[(total_bytes_received+i)>>2] |= (tmp << ((i & 0x3)*8));
|
370 |
|
|
}
|
371 |
|
|
|
372 |
|
|
bytes_received += count;
|
373 |
|
|
total_bytes_received += count;
|
374 |
|
|
}
|
375 |
|
|
while((bytes_received < bytes_this_xfer) && (retries < 15));
|
376 |
|
|
|
377 |
|
|
bytes_remaining -= bytes_this_xfer;
|
378 |
|
|
xfer_ptr += bytes_this_xfer;
|
379 |
|
|
}
|
380 |
|
|
|
381 |
|
|
// if we have a number of bits not divisible by 8
|
382 |
|
|
if(leftover_bit_length != 0) {
|
383 |
|
|
debug("Doing leftovers: (0x%X, %d, %d)\n", leftover_bits, leftover_bit_length, set_last_bit);
|
384 |
|
|
retval |= cable_common_read_stream(&leftover_bits, &leftovers_received, leftover_bit_length, set_last_bit);
|
385 |
|
|
instream[bytes_to_transfer>>2] |= (leftovers_received & 0xFF) << (8*(bytes_to_transfer & 0x3));
|
386 |
|
|
}
|
387 |
|
|
|
388 |
|
|
return retval;
|
389 |
|
|
}
|
390 |
|
|
|
391 |
|
|
|
392 |
|
|
int cable_ft245_out(uint8_t value)
|
393 |
|
|
{
|
394 |
|
|
int tck = 0;
|
395 |
|
|
int tms = 0;
|
396 |
|
|
int tdi = 0;
|
397 |
|
|
|
398 |
|
|
// Translate to USB blaster protocol
|
399 |
|
|
// USB-Blaster has no TRST pin
|
400 |
|
|
if(value & TCLK_BIT)
|
401 |
|
|
tck = 1;
|
402 |
|
|
if(value & TDI_BIT)
|
403 |
|
|
tdi = 1;;
|
404 |
|
|
if(value & TMS_BIT)
|
405 |
|
|
tms = 1;
|
406 |
|
|
|
407 |
|
|
usb_blaster_write(tck, tms, tdi);
|
408 |
|
|
|
409 |
|
|
return 0;
|
410 |
|
|
}
|
411 |
|
|
|
412 |
|
|
int cable_ft245_inout(uint8_t value, uint8_t *in_bit)
|
413 |
|
|
{
|
414 |
|
|
int tck = 0;
|
415 |
|
|
int tms = 0;
|
416 |
|
|
int tdi = 0;
|
417 |
|
|
|
418 |
|
|
// Translate to USB blaster protocol
|
419 |
|
|
// USB-Blaster has no TRST pin
|
420 |
|
|
if(value & TCLK_BIT)
|
421 |
|
|
tck = 1;
|
422 |
|
|
if(value & TDI_BIT)
|
423 |
|
|
tdi = 1;
|
424 |
|
|
if(value & TMS_BIT)
|
425 |
|
|
tms = 1;
|
426 |
|
|
|
427 |
|
|
*in_bit = usb_blaster_write_read(tck, tms, tdi);
|
428 |
|
|
|
429 |
|
|
return 0;
|
430 |
|
|
}
|
431 |
|
|
|
432 |
|
|
int cable_ft245_init(void)
|
433 |
|
|
{
|
434 |
|
|
uint8_t latency_timer;
|
435 |
|
|
|
436 |
|
|
printf("'usb_blaster' interface using libftdi\n");
|
437 |
|
|
|
438 |
|
|
if (ftdi_init(&ftdic) < 0) {
|
439 |
|
|
printf("ftdi_init failed!");
|
440 |
|
|
return -1;
|
441 |
|
|
}
|
442 |
|
|
|
443 |
|
|
/* context, vendor id, product id */
|
444 |
|
|
if (ftdi_usb_open(&ftdic, ALTERA_VID, ALTERA_PID) < 0) {
|
445 |
|
|
printf("unable to open ftdi device: %s\n", ftdic.error_str);
|
446 |
|
|
return -1;
|
447 |
|
|
}
|
448 |
|
|
|
449 |
|
|
if (ftdi_usb_reset(&ftdic) < 0) {
|
450 |
|
|
printf("unable to reset ftdi device\n");
|
451 |
|
|
return -1;
|
452 |
|
|
}
|
453 |
|
|
|
454 |
|
|
if (ftdi_set_latency_timer(&ftdic, 2) < 0) {
|
455 |
|
|
printf("unable to set latency timer\n");
|
456 |
|
|
return -1;
|
457 |
|
|
}
|
458 |
|
|
|
459 |
|
|
if (ftdi_get_latency_timer(&ftdic, &latency_timer) < 0) {
|
460 |
|
|
printf("unable to get latency timer\n");
|
461 |
|
|
return -1;
|
462 |
|
|
} else {
|
463 |
|
|
printf("current latency timer: %i\n", latency_timer);
|
464 |
|
|
}
|
465 |
|
|
|
466 |
|
|
ftdi_disable_bitbang(&ftdic);
|
467 |
|
|
|
468 |
|
|
usb_blaster_speed(300000);
|
469 |
|
|
|
470 |
|
|
return 0;
|
471 |
|
|
}
|
472 |
|
|
|
473 |
|
|
jtag_cable_t *cable_ft245_get_driver(void)
|
474 |
|
|
{
|
475 |
|
|
return &ft245_cable_driver;
|
476 |
|
|
}
|
477 |
|
|
|
478 |
|
|
|
479 |
|
|
int cable_ft245_opt(int c, char *str)
|
480 |
|
|
{
|
481 |
|
|
fprintf(stderr, "Unknown parameter '%c'\n", c);
|
482 |
|
|
return APP_ERR_BAD_PARAM;
|
483 |
|
|
}
|
484 |
|
|
|
485 |
|
|
|