391 lines
9.9 KiB
C
391 lines
9.9 KiB
C
/* MSPDebug - debugging tool for the eZ430
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* Copyright (C) 2009-2012 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 <stdarg.h>
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#include <assert.h>
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#include <string.h>
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#include "util.h"
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#include "fet_proto.h"
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#include "fet_error.h"
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#include "output.h"
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/*********************************************************************
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* Checksum calculation
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*
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* This code table is also derived from uif430.
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*/
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static const uint16_t fcstab[256] = {
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0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
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0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
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0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
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0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
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0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
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0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
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0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
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0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
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0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
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0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
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0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
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0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
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0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
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0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
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0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
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0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
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0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
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0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
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0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
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0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
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0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
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0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
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0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
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0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
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0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
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0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
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0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
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0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
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0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
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0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
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0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
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0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
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};
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static uint16_t calc_checksum(uint8_t *cp, int len)
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{
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uint16_t fcs = 0xffff;
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while (len--) {
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fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff];
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}
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return fcs ^ 0xffff;
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}
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/*********************************************************************
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* FET packet transfer. This level of the interface deals in packets
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* send to/from the device.
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*/
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/* This is a type of data transfer which appears to be unique to
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* the RF2500. Blocks of data are sent to an internal buffer. Each
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* block is prefixed with a buffer offset and a payload length.
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*
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* No checksums are included.
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*/
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static int send_rf2500_data(struct fet_proto *dev,
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const uint8_t *data, int len)
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{
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int offset = 0;
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while (len) {
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uint8_t pbuf[63];
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int plen = len > 59 ? 59 : len;
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pbuf[0] = 0x83;
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pbuf[1] = offset & 0xff;
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pbuf[2] = offset >> 8;
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pbuf[3] = plen;
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memcpy(pbuf + 4, data, plen);
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if (dev->transport->ops->send(dev->transport,
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pbuf, plen + 4) < 0)
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return -1;
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data += plen;
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len -= plen;
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offset += plen;
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}
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return 0;
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}
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#define PTYPE_ACK 0
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#define PTYPE_CMD 1
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#define PTYPE_PARAM 2
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#define PTYPE_DATA 3
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#define PTYPE_MIXED 4
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#define PTYPE_NAK 5
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#define PTYPE_FLASH_ACK 6
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static int parse_packet(struct fet_proto *dev, int plen)
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{
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uint16_t c = calc_checksum(dev->fet_buf + 2, plen - 2);
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uint16_t r = LE_WORD(dev->fet_buf, plen);
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int i = 2;
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int type;
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if (c != r) {
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printc_err("fet: checksum error (calc %04x,"
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" recv %04x)\n", c, r);
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return -1;
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}
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if (plen < 6)
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goto too_short;
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dev->command_code = dev->fet_buf[i++];
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type = dev->fet_buf[i++];
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dev->state = dev->fet_buf[i++];
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dev->error = dev->fet_buf[i++];
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if (dev->error) {
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printc_err("fet: FET returned error code %d (%s)\n",
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dev->error, fet_error(dev->error));
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return -1;
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}
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if (type == PTYPE_NAK) {
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printc_err("fet: FET returned NAK\n");
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return -1;
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}
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/* Parse packet parameters */
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if (type == PTYPE_PARAM || type == PTYPE_MIXED) {
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int j;
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if (i + 2 > plen)
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goto too_short;
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dev->argc = LE_WORD(dev->fet_buf, i);
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i += 2;
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if (dev->argc >= FET_PROTO_MAX_PARAMS) {
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printc_err("fet: too many params: %d\n", dev->argc);
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return -1;
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}
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for (j = 0; j < dev->argc; j++) {
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if (i + 4 > plen)
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goto too_short;
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dev->argv[j] = LE_LONG(dev->fet_buf, i);
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i += 4;
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}
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} else {
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dev->argc = 0;
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}
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/* Extract a pointer to the data */
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if (type == PTYPE_DATA || type == PTYPE_MIXED) {
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if (i + 4 > plen)
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goto too_short;
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dev->datalen = LE_LONG(dev->fet_buf, i);
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i += 4;
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if (i + dev->datalen > plen)
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goto too_short;
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dev->data = dev->fet_buf + i;
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} else {
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dev->data = NULL;
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dev->datalen = 0;
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}
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return 0;
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too_short:
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printc_err("fet: too short (%d bytes)\n",
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plen);
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return -1;
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}
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static void do_chomp_ff(struct fet_proto *dev)
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{
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int chomp_len = 0;
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while ((chomp_len < dev->fet_len) && dev->fet_buf[chomp_len] == 0xff)
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chomp_len++;
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if (chomp_len)
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memmove(dev->fet_buf, dev->fet_buf + chomp_len,
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dev->fet_len - chomp_len);
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dev->fet_len -= chomp_len;
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}
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/* Receive a packet from the FET. The usual format is:
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* <length (2 bytes)> <data> <checksum>
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*
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* The length is that of the data + checksum. Olimex JTAG adapters follow
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* all packets with a trailing 0x7e byte, which must be discarded.
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*/
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static int recv_packet(struct fet_proto *dev, int chomp_ff)
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{
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int pkt_extra = (dev->proto_flags & FET_PROTO_EXTRA_RECV) ? 3 : 2;
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int plen = LE_WORD(dev->fet_buf, 0);
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/* If there's a packet still here from last time, get rid of it */
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if (dev->fet_len >= plen + pkt_extra) {
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memmove(dev->fet_buf, dev->fet_buf + plen + pkt_extra,
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dev->fet_len - plen - pkt_extra);
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dev->fet_len -= plen + pkt_extra;
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}
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/* Keep adding data to the buffer until we have a complete packet */
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for (;;) {
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int len;
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plen = LE_WORD(dev->fet_buf, 0);
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if (dev->fet_len >= plen + pkt_extra)
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return parse_packet(dev, plen);
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len = dev->transport->ops->recv(dev->transport,
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dev->fet_buf + dev->fet_len,
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sizeof(dev->fet_buf) -
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dev->fet_len);
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if (len < 0)
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return -1;
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dev->fet_len += len;
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if (chomp_ff)
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do_chomp_ff(dev);
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}
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return -1;
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}
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static int send_command(struct fet_proto *dev, int command_code,
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const uint32_t *params, int nparams,
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const uint8_t *extra, int exlen)
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{
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uint8_t datapkt[FET_PROTO_MAX_BLOCK * 2];
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int len = 0;
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uint8_t buf[FET_PROTO_MAX_BLOCK * 3];
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uint16_t cksum;
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int i = 0;
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int j;
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assert (len + exlen + 2 <= sizeof(datapkt));
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/* Command code and packet type */
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datapkt[len++] = command_code;
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datapkt[len++] = ((nparams > 0) ? 1 : 0) + ((exlen > 0) ? 2 : 0) + 1;
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/* Optional parameters */
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if (nparams > 0) {
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datapkt[len++] = nparams & 0xff;
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datapkt[len++] = nparams >> 8;
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for (j = 0; j < nparams; j++) {
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uint32_t p = params[j];
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datapkt[len++] = p & 0xff;
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p >>= 8;
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datapkt[len++] = p & 0xff;
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p >>= 8;
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datapkt[len++] = p & 0xff;
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p >>= 8;
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datapkt[len++] = p & 0xff;
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}
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}
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/* Extra data */
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if (extra) {
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int x = exlen;
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datapkt[len++] = x & 0xff;
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x >>= 8;
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datapkt[len++] = x & 0xff;
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x >>= 8;
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datapkt[len++] = x & 0xff;
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x >>= 8;
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datapkt[len++] = x & 0xff;
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memcpy(datapkt + len, extra, exlen);
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len += exlen;
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}
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/* Checksum */
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cksum = calc_checksum(datapkt, len);
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datapkt[len++] = cksum & 0xff;
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datapkt[len++] = cksum >> 8;
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/* Copy into buf, escaping special characters and adding
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* delimeters.
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*/
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if (!(dev->proto_flags & FET_PROTO_NOLEAD_SEND))
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buf[i++] = 0x7e;
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for (j = 0; j < len; j++) {
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char c = datapkt[j];
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if (c == 0x7e || c == 0x7d) {
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buf[i++] = 0x7d;
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c ^= 0x20;
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}
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buf[i++] = c;
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}
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buf[i++] = 0x7e;
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assert (i < sizeof(buf));
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return dev->transport->ops->send(dev->transport, buf, i);
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}
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void fet_proto_init(struct fet_proto *dev, transport_t transport,
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int proto_flags)
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{
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dev->transport = transport;
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dev->proto_flags = proto_flags;
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dev->fet_len = 0;
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}
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int fet_proto_xfer(struct fet_proto *dev,
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int command_code, const uint8_t *data, int datalen,
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int nparams, ...)
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{
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uint32_t params[FET_PROTO_MAX_PARAMS];
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int i;
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va_list ap;
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assert (nparams <= FET_PROTO_MAX_PARAMS);
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va_start(ap, nparams);
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for (i = 0; i < nparams; i++)
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params[i] = va_arg(ap, uint32_t);
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va_end(ap);
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if (data && (dev->proto_flags & FET_PROTO_SEPARATE_DATA)) {
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assert (nparams + 1 <= FET_PROTO_MAX_PARAMS);
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params[nparams++] = datalen;
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if (send_rf2500_data(dev, data, datalen) < 0)
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return -1;
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if (send_command(dev, command_code, params, nparams,
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NULL, 0) < 0)
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return -1;
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} else if (send_command(dev, command_code, params, nparams,
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data, datalen) < 0)
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return -1;
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/* Olimex devices sometimes return a spurious 0xff before their
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* response to C_INITIALIZE.
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*/
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if (recv_packet(dev, (command_code == 0x01)) < 0)
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return -1;
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if (dev->command_code != command_code) {
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printc_err("fet: reply type mismatch\n");
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return -1;
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}
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return 0;
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}
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