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////////////////////////////////////////////////////////////////////////////////
//
// Filename: ttybus.cpp
//
// Project: OpenArty, an entirely open SoC based upon the Arty platform
//
// Purpose: This is the C++ program on the command side that will interact
// with a UART on an FPGA, to command the WISHBONE on that same
// FPGA to ... whatever we wish to command it to do.
//
// This code does not run on an FPGA, is not a test bench, neither
// is it a simulator. It is a portion of a command program
// for commanding an FPGA.
//
// Creator: Dan Gisselquist, Ph.D.
// Gisselquist Technology, LLC
//
////////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2015-2017, Gisselquist Technology, LLC
//
// This program is free software (firmware): you can redistribute it and/or
// modify it under the terms of the GNU General Public License as published
// by the Free Software Foundation, either version 3 of the License, or (at
// your option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. (It's in the $(ROOT)/doc directory. Run make with no
// target there if the PDF file isn't present.) If not, see
// <http://www.gnu.org/licenses/> for a copy.
//
// License: GPL, v3, as defined and found on www.gnu.org,
// http://www.gnu.org/licenses/gpl.html
//
//
////////////////////////////////////////////////////////////////////////////////
//
//
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <arpa/inet.h>
#include <assert.h>
#include <strings.h>
#include <poll.h>
#include <ctype.h>
#include "ttybus.h"
#define TTYC_IDLE '0'
#define TTYC_BUSY '1'
#define TTYC_WRITE '2'
#define TTYC_RESET '3'
#define TTYC_INT '4'
#define TTYC_ERR '5'
const unsigned TTYBUS::MAXRDLEN = 1024;
const unsigned TTYBUS::MAXWRLEN = 32;
// #define DBGPRINTF printf
// #define DBGPRINTF filedump
#ifndef DBGPRINTF
#define DBGPRINTF null
#else
#warning "TTYBUS DEBUG IS TURNED ON"
#endif
void null(...) {}
#include <stdarg.h> // replaces the (defunct) varargs.h include file
void filedump(const char *fmt, ...) {
static FILE *dbgfp = NULL;
va_list args;
if (!dbgfp)
dbgfp = fopen("debug.txt", "w");
va_start(args, fmt);
vfprintf(dbgfp, fmt, args);
va_end(args);
fflush(dbgfp);
// If you want the debug output to go to stderr as well, you can
// uncomment the next couple of lines
// va_start(args, fmt);
// vfprintf(stderr, fmt, args);
// va_end(args);
}
char TTYBUS::charenc(const int sixbitval) const {
if (sixbitval < 10)
return '0' + sixbitval;
else if (sixbitval < 10+26)
return 'A' - 10 + sixbitval;
else if (sixbitval < 10+26+26)
return 'a' - 10 - 26 + sixbitval;
else if (sixbitval == 0x3e)
return '@';
else if (sixbitval == 0x3f)
return '%';
fprintf(stderr, "INTERNAL ERR: SIXBITVAL isn\'t!!!! sixbitval = %08x\n", sixbitval);
assert((sixbitval & (~0x03f))==0);
return 0;
}
unsigned TTYBUS::chardec(const char b) const {
if ((b >= '0')&&(b <= '9'))
return b-'0';
else if ((b >= 'A')&&(b <= 'Z'))
return b-'A'+10;
else if ((b >= 'a')&&(b <= 'z'))
return b-'a'+36;
else if (b == '@')
return 0x03e;
else if (b == '%')
return 0x03f;
else
return 0x0100; // ERR -- invalid code
}
int TTYBUS::lclreadcode(char *buf, int len) {
char *sp, *dp;
int nr, ret;
nr = m_dev->read(buf, len);
m_total_nread += nr;
ret = nr; sp = buf; dp = buf;
for(int i=0; i<nr; i++) {
if (chardec(*sp)&(~0x3f)) {
ret--; // Skip this value, not a valid codeword
sp++;
} else {
*sp++ = *dp++;
}
} return ret;
}
void TTYBUS::bufalloc(int len) {
if ((m_buf)&&(m_buflen >= len))
return;
if (m_buf)
delete[] m_buf;
m_buflen = (len&(-0x3f))+0x40;
m_buf = new char[m_buflen];
}
void TTYBUS::encode(const int hb, const BUSW val, char *buf) const {
buf[0] = charenc( (hb<<2)|((val>>30)&0x03) );
buf[1] = charenc( (val>>24)&0x3f);
buf[2] = charenc( (val>>18)&0x3f);
buf[3] = charenc( (val>>12)&0x3f);
buf[4] = charenc( (val>> 6)&0x3f);
buf[5] = charenc( (val )&0x3f);
}
unsigned TTYBUS::decodestr(const char *buf) const {
unsigned r;
r = chardec(buf[0]) & 0x03;
r = (r<<6) | (chardec(buf[1]) & 0x03f);
r = (r<<6) | (chardec(buf[2]) & 0x03f);
r = (r<<6) | (chardec(buf[3]) & 0x03f);
r = (r<<6) | (chardec(buf[4]) & 0x03f);
r = (r<<6) | (chardec(buf[5]) & 0x03f);
return r;
}
int TTYBUS::decodehex(const char hx) const {
if ((hx >= '0')&&(hx <= '9'))
return hx-'0';
else if ((hx >= 'A')&&(hx <= 'Z'))
return hx-'A'+10;
else if ((hx >= 'a')&&(hx <= 'z'))
return hx-'a'+10;
else
return 0;
}
void TTYBUS::writeio(const BUSW a, const BUSW v) {
writev(a, 0, 1, &v);
m_lastaddr = a; m_addr_set = true;
}
void TTYBUS::writev(const BUSW a, const int p, const int len, const BUSW *buf) {
char *ptr;
int nw = 0;
// We'll never be called with more than MAXWRLEN words to write at once.
// This is a configurable option length, set at the top of this file.
// (currently set at 32, but subject to change ...) This is important,
// as the return channel *must* be capable of holding at least this many
// acknowledgments in its buffer.
//
// assert(len <= MAXWRLEN);
// Allocate a buffer of six bytes per word, one for addr, plus
// six more
bufalloc((len+2)*6);
DBGPRINTF("WRITEV(%08x,%d,#%d,0x%08x ...)\n", a, p, len, buf[0]);
// Encode the address
ptr = encode_address(a);
m_lastaddr = a; m_addr_set = true;
while(nw < len) {
int ln = len-nw;
if ((unsigned)ln > MAXWRLEN)
ln = MAXWRLEN;
DBGPRINTF("WRITEV-SUB(%08x%s,#%d,&buf[%d])\n", a+nw, (p)?"++":"", ln, nw);
for(int i=0; i<ln; i++) {
BUSW val = buf[nw+i];
int caddr = 0;
// Let's try compression
for(int i=1; i<256; i++) {
unsigned tstaddr;
tstaddr = (m_wraddr - i) & 0x0ff;
if ((!m_wrloaded)&&(tstaddr > (unsigned)m_wraddr))
break;
if (m_writetbl[tstaddr] == val) {
caddr = ( m_wraddr- tstaddr ) & 0x0ff;
break;
}
}
/*
if (caddr != 0)
DBGPRINTF("WR[%08x] = %08x (= TBL[%4x] <= %4x)\n", m_lastaddr, val, caddr, m_wraddr);
else
DBGPRINTF("WR[%08x] = %08x\n", m_lastaddr, val);
*/
if (caddr != 0) {
*ptr++ = charenc( (((caddr>>6)&0x03)<<1) + (p?1:0) + 0x010);
*ptr++ = charenc( caddr &0x3f );
} else {
// For testing, let's start just doing this the hard way
*ptr++ = charenc( (((val>>30)&0x03)<<1) + (p?1:0) + 0x018);
*ptr++ = charenc( (val>>24)&0x3f);
*ptr++ = charenc( (val>>18)&0x3f);
*ptr++ = charenc( (val>>12)&0x3f);
*ptr++ = charenc( (val>> 6)&0x3f);
*ptr++ = charenc( (val )&0x3f);
m_writetbl[m_wraddr++] = val;
m_wraddr &= 0x0ff;
if (m_wraddr == 0) {
m_wrloaded = true;
}
}
if (p == 1) m_lastaddr+=4;
}
// *ptr++ = charenc(0x2e);
if (ln == len-nw)
*ptr++ = '\n';
*ptr = '\0';
m_dev->write(m_buf, ptr-m_buf);
DBGPRINTF(">> %s\n", m_buf);
readidle();
nw += ln;
ptr = m_buf;
}
DBGPRINTF("WR: LAST ADDRESS LEFT AT %08x\n", m_lastaddr);
// Need to clear the incoming queue ... if there's anything there.
// We could do a ...
// readacks(len);
// to clear a known number of acks (up to half the length of our buffer
// which we can let just sit for speed ...), or we could do a ...
// readtilidle(void);
// Then, upon startup we could also start with a readtilidle(); command.
// This would help to clear out the problems between programs, where
// one program doesn't finish reading, and the next gets a confusing
// message.
readidle();
}
void TTYBUS::writez(const BUSW a, const int len, const BUSW *buf) {
writev(a, 0, len, buf);
}
void TTYBUS::writei(const BUSW a, const int len, const BUSW *buf) {
writev(a, 1, len, buf);
}
TTYBUS::BUSW TTYBUS::readio(const TTYBUS::BUSW a) {
BUSW v;
// I/O reads are now the same as vector reads, but with a vector length
// of one.
DBGPRINTF("READIO(0x%08x)\n", a);
try {
readv(a, 0, 1, &v);
} catch(BUSERR b) {
DBGPRINTF("BUSERR trying to read %08x\n", a);
throw BUSERR(a);
}
if (m_lastaddr != a) {
DBGPRINTF("LAST-ADDR MIS-MATCH: (RCVD) %08x != %08x (XPECTED)\n", m_lastaddr, a);
m_addr_set = false;
exit(-3);
}
return v;
}
char *TTYBUS::encode_address(const TTYBUS::BUSW a) {
TTYBUS::BUSW addr = a>>2;
char *ptr = m_buf;
// Double check that we are aligned
if ((a&3)!=0) {
throw BUSERR(a);
}
if ((m_addr_set)&&(a == m_lastaddr))
return ptr;
if (m_addr_set) {
// Encode a difference address
int diffaddr = (a - m_lastaddr)>>2;
ptr = m_buf;
if ((diffaddr >= -32)&&(diffaddr < 32)) {
*ptr++ = charenc(0x09);
*ptr++ = charenc(diffaddr & 0x03f);
} else if ((diffaddr >= -2048)&&(diffaddr < 2048)) {
*ptr++ = charenc(0x0b);
*ptr++ = charenc((diffaddr>>6) & 0x03f);
*ptr++ = charenc( diffaddr & 0x03f);
} else if ((diffaddr >= -(1<<17))&&(diffaddr < (1<<17))) {
*ptr++ = charenc(0x0d);
*ptr++ = charenc((diffaddr>>12) & 0x03f);
*ptr++ = charenc((diffaddr>> 6) & 0x03f);
*ptr++ = charenc( diffaddr & 0x03f);
} else if ((diffaddr >= -(1<<23))&&(diffaddr < (1<<23))) {
*ptr++ = charenc(0x0d);
*ptr++ = charenc((diffaddr>>18) & 0x03f);
*ptr++ = charenc((diffaddr>>12) & 0x03f);
*ptr++ = charenc((diffaddr>> 6) & 0x03f);
*ptr++ = charenc( diffaddr & 0x03f);
}
*ptr = '\0';
DBGPRINTF("DIF-ADDR: (%ld) \'%s\' encodes last_addr(0x%08x) %c %d(0x%08x)\n",
ptr-m_buf, m_buf,
m_lastaddr, (diffaddr<0)?'-':'+',
diffaddr, diffaddr&0x0ffffffff);
}
{
// Encode an absolute (low memory) address
// Prefer absolute address encoding over differential encoding,
// when both encodings encode the same address, and when both
// encode the address in the same number of words
if ((addr <= 0x03f)&&((ptr == m_buf)||(ptr >= &m_buf[2]))) {
ptr = m_buf;
*ptr++ = charenc(0x08);
*ptr++ = charenc(addr);
} else if((addr <= 0x0fff)&&((ptr == m_buf)||(ptr >= &m_buf[3]))) {
DBGPRINTF("Setting ADDR.3 to %08x\n", addr);
ptr = m_buf;
*ptr++ = charenc(0x0a);
*ptr++ = charenc((addr>> 6) & 0x03f);
*ptr++ = charenc( addr & 0x03f);
} else if((addr <= 0x03ffff)&&((ptr == m_buf)||(ptr >= &m_buf[4]))) {
DBGPRINTF("Setting ADDR.4 to %08x\n", addr);
ptr = m_buf;
*ptr++ = charenc(0x0c);
*ptr++ = charenc((addr>>12) & 0x03f);
*ptr++ = charenc((addr>> 6) & 0x03f);
*ptr++ = charenc( addr & 0x03f);
} else if((addr <= 0x0ffffff)&&((ptr == m_buf)||(ptr >= &m_buf[5]))) {
DBGPRINTF("Setting ADDR.5 to %08x\n", addr);
ptr = m_buf;
*ptr++ = charenc(0x0e);
*ptr++ = charenc((addr>>18) & 0x03f);
*ptr++ = charenc((addr>>12) & 0x03f);
*ptr++ = charenc((addr>> 6) & 0x03f);
*ptr++ = charenc( addr & 0x03f);
} else if (ptr == m_buf) { // Send our address prior to any read
// ptr = m_buf;
encode(0, addr, ptr);
ptr+=6;
}
}
*ptr = '\0';
DBGPRINTF("ADDR-CMD: (%ld) \'%s\'\n", ptr-m_buf, m_buf);
m_rdaddr = 0;
return ptr;
}
char *TTYBUS::readcmd(const int inc, const int len, char *buf) {
char *ptr = buf;
DBGPRINTF("READCMD: LEN = %d: ", len);
assert(len < 520);
assert(len > 0);
if (len <= 8) {
*ptr++ = charenc(0x20 + (((len-1)&0x07)<<1) + (inc?1:0));
DBGPRINTF("%c\n", ptr[-1]);
} else {
*ptr++ = charenc(0x30 + (((len-9)>>5)&0x0e) + (inc?1:0));
*ptr++ = charenc( (len-9) & 0x03f);
DBGPRINTF("%c%c\n", ptr[-2], ptr[-1]);
}
return ptr;
}
void TTYBUS::readv(const TTYBUS::BUSW a, const int inc, const int len, TTYBUS::BUSW *buf) {
const int READAHEAD = MAXRDLEN/2, READBLOCK=(MAXRDLEN/2>512)?512:MAXRDLEN/2;
int cmdrd = 0, nread = 0;
// TTYBUS::BUSW addr = a;
char *ptr = m_buf;
if (len <= 0)
return;
DBGPRINTF("READV(%08x,%d,#%4d)\n", a, inc, len);
ptr = encode_address(a);
try {
while(cmdrd < len) {
// ptr = m_buf;
do {
int nrd = len-cmdrd;
if (nrd > READBLOCK)
nrd = READBLOCK;
if (cmdrd-nread + nrd>READAHEAD+READBLOCK)
nrd = READAHEAD+READBLOCK-(cmdrd-nread);
ptr = readcmd(inc, nrd, ptr);
cmdrd += nrd;
} while((cmdrd-nread < READAHEAD+READBLOCK)&&(cmdrd< len));
*ptr++ = '\n'; *ptr = '\0';
m_dev->write(m_buf, (ptr-m_buf));
// DBGPRINTF("Reading %d words\n", (cmdrd-nread));
while(nread<(cmdrd-READAHEAD)) {
buf[nread++] = readword();
} ptr = m_buf;
} // DBGPRINTF("Reading %d words, to end the read\n", len-nread);
while(nread<len) {
buf[nread++] = readword();
}
} catch(BUSERR b) {
DBGPRINTF("READV::BUSERR trying to read %08x\n", a+((inc)?nread:0));
throw BUSERR(a+((inc)?(nread<<2):0));
}
if ((unsigned)m_lastaddr != (a+((inc)?(len<<2):0))) {
DBGPRINTF("TTYBUS::READV(a=%08x,inc=%d,len=%4x,x) ERR: (Last) %08x != %08x + %08x (Expected)\n", a, inc, len<<2, m_lastaddr, a, (inc)?(len<<2):0);
printf("TTYBUS::READV(a=%08x,inc=%d,len=%4x,x) ERR: (Last) %08x != %08x + %08x (Expected)\n", a, inc, len<<2, m_lastaddr, a, (inc)?(len<<2):0);
sleep(1);
assert((int)m_lastaddr == (a+(inc)?(len<<2):0));
exit(-3);
}
DBGPRINTF("READV::COMPLETE\n");
}
void TTYBUS::readi(const TTYBUS::BUSW a, const int len, TTYBUS::BUSW *buf) {
readv(a, 1, len, buf);
}
void TTYBUS::readz(const TTYBUS::BUSW a, const int len, TTYBUS::BUSW *buf) {
readv(a, 0, len, buf);
}
TTYBUS::BUSW TTYBUS::readword(void) {
TTYBUS::BUSW val = 0;
int nr;
unsigned sixbits;
DBGPRINTF("READ-WORD()\n");
bool found_start = false;
do {
// Blocking read (for now)
do {
nr = lclreadcode(&m_buf[0], 1);
} while (nr < 1);
DBGPRINTF("READWORD: -- lclreadcode, nr = %d, m_buf[0] = %c\n", nr, m_buf[0]);
sixbits = chardec(m_buf[0]);
if (sixbits&(~0x03f)) {
// Ignore new lines, unprintables, and characters
// not a part of our code
;
} else if (sixbits < 6) {
switch(sixbits) {
case 0: break; // Idle -- ignore
case 1: break; // Idle, but the bus is busy
case 2: break; // Write acknowledgement, ignore it here
case 3:
m_bus_err = true;
DBGPRINTF("READWORD::BUSRESET (unknown addr)\n");
throw BUSERR(0);
break;
case 4:
m_interrupt_flag = true;
break;
case 5:
DBGPRINTF("READWORD::BUSERR (unknown addr)\n");
m_bus_err = true;
throw BUSERR(0);
break;
}
} else if (0x08 == (sixbits & 0x3c)) { // Set 32-bit address
do {
nr += lclreadcode(&m_buf[nr], 6-nr);
} while (nr < 6);
val = chardec(m_buf[0]) & 0x03;
val = (val<<6) | (chardec(m_buf[1]) & 0x03f);
val = (val<<6) | (chardec(m_buf[2]) & 0x03f);
val = (val<<6) | (chardec(m_buf[3]) & 0x03f);
val = (val<<6) | (chardec(m_buf[4]) & 0x03f);
val = (val<<6) | (chardec(m_buf[5]) & 0x03f);
m_addr_set = true;
m_lastaddr = val<<2;
DBGPRINTF("RCVD ADDR: 0x%08x\n", val<<2);
} else if (0x0c == (sixbits & 0x03c)) { // Set 32-bit address,compressed
int nw = (sixbits & 0x03) + 2;
do {
nr += lclreadcode(&m_buf[nr], nw-nr);
} while (nr < nw);
if (nw == 2) {
val = chardec(m_buf[1]);
} else if (nw == 3) {
val = chardec(m_buf[1]);
val = (val<<6) | (chardec(m_buf[2]) & 0x03f);
} else if (nw == 4) {
val = chardec(m_buf[1]);
val = (val<<6) | (chardec(m_buf[2]) & 0x03f);
val = (val<<6) | (chardec(m_buf[3]) & 0x03f);
} else { // if (nw == 5)
val = chardec(m_buf[1]);
val = (val<<6) | (chardec(m_buf[2]) & 0x03f);
val = (val<<6) | (chardec(m_buf[3]) & 0x03f);
val = (val<<6) | (chardec(m_buf[4]) & 0x03f);
}
m_addr_set = true;
m_lastaddr = val<<2;
DBGPRINTF("RCVD ADDR: 0x%08x (%d bytes)\n", val<<2, nw+1);
} else
found_start = true;
} while(!found_start);
int rdaddr;
DBGPRINTF("READ-WORD() -- sixbits = %02x\n", sixbits);
if (0x06 == (sixbits & 0x03e)) { // Tbl read, last value
rdaddr = (m_rdaddr-1)&0x03ff;
val = m_readtbl[rdaddr];
m_lastaddr += (sixbits&1)?4:0;
DBGPRINTF("READ-WORD() -- repeat last value, %08x, A= %08x\n", val, m_lastaddr);
} else if (0x10 == (sixbits & 0x030)) { // Tbl read, up to 521 into past
int idx;
do {
nr += lclreadcode(&m_buf[nr], 2-nr);
} while (nr < 2);
idx = (chardec(m_buf[0])>>1) & 0x07;
idx = ((idx<<6) | (chardec(m_buf[1]) & 0x03f)) + 2 + 8;
rdaddr = (m_rdaddr-idx)&0x03ff;
val = m_readtbl[rdaddr];
m_lastaddr += (sixbits&1)?4:0;
DBGPRINTF("READ-WORD() -- long table value[%3d], %08x, A=%08x\n", idx, val, m_lastaddr);
} else if (0x20 == (sixbits & 0x030)) { // Tbl read, 2-9 into past
int idx;
idx = (((sixbits>>1)&0x07)+2);
rdaddr = (m_rdaddr - idx) & 0x03ff;
val = m_readtbl[rdaddr];
m_lastaddr += (sixbits&1)?4:0;
DBGPRINTF("READ-WORD() -- short table value[%3d], %08x, A=%08x\n", idx, val, m_lastaddr);
} else if (0x38 == (sixbits & 0x038)) { // Raw read
// DBGPRINTF("READ-WORD() -- RAW-READ, nr = %d\n", nr);
do {
nr += lclreadcode(&m_buf[nr], 6-nr);
} while (nr < 6);
val = (chardec(m_buf[0])>>1) & 0x03;
val = (val<<6) | (chardec(m_buf[1]) & 0x03f);
val = (val<<6) | (chardec(m_buf[2]) & 0x03f);
val = (val<<6) | (chardec(m_buf[3]) & 0x03f);
val = (val<<6) | (chardec(m_buf[4]) & 0x03f);
val = (val<<6) | (chardec(m_buf[5]) & 0x03f);
m_readtbl[m_rdaddr++] = val; m_rdaddr &= 0x03ff;
m_lastaddr += (sixbits&1)?4:0;
DBGPRINTF("READ-WORD() -- RAW-READ %02x:%02x:%02x:%02x:%02x:%02x -- %08x, A=%08x\n",
m_buf[0], m_buf[1], m_buf[2], m_buf[3],
m_buf[4], m_buf[5], val, m_lastaddr);
} else
DBGPRINTF("READ-WORD() -- Unknown character, %02x\n", sixbits);
return val;
}
void TTYBUS::readidle(void) {
TTYBUS::BUSW val = 0;
int nr;
unsigned sixbits;
bool found_start = false;
DBGPRINTF("READ-IDLE()\n");
while((!found_start)&&(m_dev->available())
&&((nr=lclreadcode(&m_buf[0], 1))>0)) {
nr = lclreadcode(&m_buf[0], 1);
sixbits = chardec(m_buf[0]);
if (sixbits&(~0x03f)) {
// Ignore new lines, unprintables, and characters
// not a part of our code
;
} else if (sixbits < 6) {
switch(sixbits) {
case 0: break; // Idle -- ignore
case 1: break; // Idle, but the bus is busy
case 2:
// Write acknowledgement, ignore it here
// This is one of the big reasons why we are
// doing this.
break;
case 3:
m_bus_err = true;
DBGPRINTF("READ-IDLE() - BUSERR\n");
throw BUSERR(0);
break;
case 4:
m_interrupt_flag = true;
break;
case 5:
m_bus_err = true;
DBGPRINTF("READ-IDLE() - BUS RESET\n");
throw BUSERR(0);
break;
}
} else if (0x08 == (sixbits & 0x3c)) { // Set 32-bit address
do {
nr += lclreadcode(&m_buf[nr], 6-nr);
} while (nr < 6);
val = chardec(m_buf[0]) & 0x03;
val = (val<<6) | (chardec(m_buf[1]) & 0x03f);
val = (val<<6) | (chardec(m_buf[2]) & 0x03f);
val = (val<<6) | (chardec(m_buf[3]) & 0x03f);
val = (val<<6) | (chardec(m_buf[4]) & 0x03f);
val = (val<<6) | (chardec(m_buf[5]) & 0x03f);
/* Ignore the address, as we are in readidle();
m_addr_set = true;
m_lastaddr = val;
*/
DBGPRINTF("RCVD IDLE-ADDR: 0x%08x\n", val);
} else if (0x0c == (sixbits & 0x03c)) { // Set 32-bit address,compressed
int nw = (sixbits & 0x03) + 2;
do {
nr += lclreadcode(&m_buf[nr], nw-nr);
} while (nr < nw);
if (nw == 2) {
val = chardec(m_buf[1]);
} else if (nw == 3) {
val = chardec(m_buf[1]);
val = (val<<6) | (chardec(m_buf[2]) & 0x03f);
} else if (nw == 4) {
val = chardec(m_buf[1]);
val = (val<<6) | (chardec(m_buf[2]) & 0x03f);
val = (val<<6) | (chardec(m_buf[3]) & 0x03f);
} else { // if (nw == 5)
val = chardec(m_buf[1]);
val = (val<<6) | (chardec(m_buf[2]) & 0x03f);
val = (val<<6) | (chardec(m_buf[3]) & 0x03f);
val = (val<<6) | (chardec(m_buf[4]) & 0x03f);
}
/* Ignore address, we are in readidle();
m_addr_set = true;
m_lastaddr = val;
*/
DBGPRINTF("RCVD IDLE-ADDR: 0x%08x (%d bytes)\n", val, nw+1);
} else
found_start = true;
}
if (found_start) {
// We're in readidle(). We don't expect to find any data.
// But ... we did. So, just read it off and ignore it.
int rdaddr;
DBGPRINTF("READ-IDLE() PANIC! -- sixbits = %02x\n", sixbits);
if (0x06 == (sixbits & 0x03e)) { // Tbl read, last value
rdaddr = (m_rdaddr-1)&0x03ff;
val = m_readtbl[rdaddr];
m_lastaddr += (sixbits&1)?4:0;
DBGPRINTF("READ-IDLE() -- repeat last value, %08x\n", val);
} else if (0x10 == (sixbits & 0x030)) { // Tbl read, up to 521 into past
int idx;
do {
nr += lclreadcode(&m_buf[nr], 2-nr);
} while (nr < 2);
idx = (chardec(m_buf[0])>>1) & 0x07;
idx = ((idx<<6) | (chardec(m_buf[1]) & 0x03f)) + 2 + 8;
rdaddr = (m_rdaddr-idx)&0x03ff;
val = m_readtbl[rdaddr];
m_lastaddr += (sixbits&1)?4:0;
DBGPRINTF("READ-IDLE() -- long table value[%3d], %08x\n", idx, val);
} else if (0x20 == (sixbits & 0x030)) { // Tbl read, 2-9 into past
rdaddr = (m_rdaddr - (((sixbits>>1)&0x07)+2)) & 0x03ff;
val = m_readtbl[rdaddr];
m_lastaddr += (sixbits&1)?4:0;
DBGPRINTF("READ-IDLE() -- short table value[%3d], %08x\n", rdaddr, val);
} else if (0x38 == (sixbits & 0x038)) { // Raw read
do {
nr += lclreadcode(&m_buf[nr], 6-nr);
} while (nr < 6);
val = (chardec(m_buf[0])>>1) & 0x03;
val = (val<<6) | (chardec(m_buf[1]) & 0x03f);
val = (val<<6) | (chardec(m_buf[2]) & 0x03f);
val = (val<<6) | (chardec(m_buf[3]) & 0x03f);
val = (val<<6) | (chardec(m_buf[4]) & 0x03f);
val = (val<<6) | (chardec(m_buf[5]) & 0x03f);
m_readtbl[m_rdaddr++] = val; m_rdaddr &= 0x03ff;
m_lastaddr += (sixbits&1)?4:0;
DBGPRINTF("READ-IDLE() -- RAW-READ %02x:%02x:%02x:%02x:%02x:%02x -- %08x\n",
m_buf[0], m_buf[1], m_buf[2], m_buf[3],
m_buf[4], m_buf[5], val);
} else
DBGPRINTF("READ-IDLE() -- Unknown character, %02x\n", sixbits);
}
}
void TTYBUS::usleep(unsigned ms) {
if (m_dev->poll(ms)) {
int nr;
nr = m_dev->read(m_buf, 16);
if (nr == 0) {
// Connection closed, let it drop
DBGPRINTF("Connection closed!!\n");
m_dev->close();
exit(-1);
} for(int i=0; i<nr; i++) {
if (m_buf[i] == TTYC_INT) {
m_interrupt_flag = true;
DBGPRINTF("!!!!!!!!!!!!!!!!! ----- INTERRUPT!\n");
} else if (m_buf[i] == TTYC_IDLE) {
DBGPRINTF("Interface is now idle\n");
} else if (m_buf[i] == TTYC_WRITE) {
} else if (m_buf[i] == TTYC_RESET) {
DBGPRINTF("Bus was RESET!\n");
} else if (m_buf[i] == TTYC_ERR) {
DBGPRINTF("Bus error\n");
} else if (m_buf[i] == TTYC_BUSY) {
DBGPRINTF("Interface is ... busy ??\n");
}
// else if (m_buf[nr] == 'Q')
// else if (m_buf[nr] == 'W')
// else if (m_buf[nr] == '\n')
}
}
}
void TTYBUS::wait(void) {
if (m_interrupt_flag)
DBGPRINTF("INTERRUPTED PRIOR TO WAIT()\n");
do {
usleep(200);
} while(!m_interrupt_flag);
}
// TTYBUS: 3503421 ~= 3.3 MB, stopwatch = 1:18.5 seconds, vs 53.8 secs
// If you issue two 512 word reads at once, time drops to 41.6 secs.
// PORTBUS: 6408320 ~= 6.1 MB, ... 26% improvement, 53 seconds real time