ref: 75c92428225428c8fde2d015f010e608a0b12f1d
dir: purgatorio/appl/cmd/lego/firmdl.b
implement RcxFirmdl;
include "sys.m";
include "draw.m";
include "bufio.m";
include "rcxsend.m";
RcxFirmdl : module {
init : fn (ctxt : ref Draw->Context, argv : list of string);
};
sys : Sys;
bufio : Bufio;
rcx : RcxSend;
me : int;
Iobuf : import bufio;
Image : adt {
start : int;
offset : int;
length : int;
data : array of byte;
};
DL_HDR : con 5; # download packet hdr size
DL_DATA : con 16rc8; # download packet payload size
init(nil : ref Draw->Context, argv : list of string)
{
sys = load Sys Sys->PATH;
me = sys->pctl(Sys->NEWPGRP, nil);
bufio = load Bufio Bufio->PATH;
if (bufio == nil)
error(sys->sprint("cannot load bufio module: %r"));
rcx = load RcxSend RcxSend->PATH; #"rcxsend.dis";
if (rcx == nil)
error(sys->sprint("cannot load rcx module: %r"));
argv = tl argv;
if (len argv != 2)
error("usage: portnum file");
portnum := int hd argv;
file := hd tl argv;
img := getimage(file);
cksum := sum(img.data[0:img.length]);
sys->print("length %.4x start %.4x \n", img.length, img.start);
err := rcx->init(portnum, 1);
if (err != nil)
error(err);
# delete firmware
sys->print("delete firmware\n");
reply : array of byte;
rmfirm := array [] of {byte 16r65, byte 1, byte 3, byte 5, byte 7, byte 11};
reply = rcx->send(rmfirm, len rmfirm, 1);
if (reply == nil)
error("delete firmware failed");
chkreply(reply, array [] of {byte 16r92}, "delete firmware");
# start download
sys->print("start download\n");
dlstart := array [] of {byte 16r75,
byte (img.start & 16rff),
byte ((img.start>>8) & 16rff),
byte (cksum & 16rff),
byte ((cksum>>8) & 16rff),
byte 0,
};
reply = rcx->send(dlstart, len dlstart, 2);
chkreply(reply,array [] of {byte 16r82, byte 0}, "start download");
# send the image
data := array [DL_HDR+DL_DATA+1] of byte; # hdr + data + 1 byte cksum
seqnum := 1;
step := DL_DATA;
for (i := 0; i < img.length; i += step) {
data[0] = byte 16r45;
if (seqnum & 1)
# alternate ops have bit 4 set
data[0] |= byte 16r08;
if (i + step > img.length) {
step = img.length - i;
seqnum = 0;
}
sys->print(".");
data[1] = byte (seqnum & 16rff);
data[2] = byte ((seqnum >> 8) & 16rff);
data[3] = byte (step & 16rff);
data[4] = byte ((step >> 8) & 16rff);
data[5:] = img.data[i:i+step];
data[5+step] = byte (sum(img.data[i:i+step]) & 16rff);
reply = rcx->send(data, DL_HDR+step+1, 2);
chkreply(reply, array [] of {byte 16rb2, byte 0}, "tx data");
seqnum++;
}
# unlock firmware
sys->print("\nunlock firmware\n");
ulfirm := array [] of {byte 16ra5, byte 'L', byte 'E', byte 'G', byte 'O', byte 174};
reply = rcx->send(ulfirm, len ulfirm, 26);
chkreply(reply, array [] of {byte 16r52}, "unlock firmware");
sys->print("result: %s\n", string reply[1:]);
# all done, tidy up
killgrp(me);
}
chkreply(got, expect : array of byte, err : string)
{
if (got == nil || len got < len expect)
error(err + ": short reply");
# RCX sometimes sets bit 3 of 'opcode' byte to prevent
# headers with same opcode having exactly same value - mask out
got[0] &= byte 16rf7;
for (i := 0; i < len expect; i++)
if (got[i] != expect[i]) {
hexdump(got);
error(sys->sprint("%s: reply mismatch at %d", err, i));
}
}
error(msg : string)
{
sys->print("%s\n", msg);
killgrp(me);
}
killgrp(pid : int)
{
pctl := sys->open("/prog/" + string pid + "/ctl", Sys->OWRITE);
if (pctl != nil) {
poison := array of byte "killgrp";
sys->write(pctl, poison, len poison);
}
exit;
}
sum(data : array of byte) : int
{
t := 0;
for (i := 0; i < len data; i++)
t += int data[i];
return t;
}
hexdump(data : array of byte)
{
for (i := 0; i < len data; i++)
sys->print("%.2x ", int data[i]);
sys->print("\n");
}
IMGSTART : con 16r8000;
IMGLEN : con 16r4c00;
getimage(path : string) : ref Image
{
img := ref Image (IMGSTART, IMGSTART, 0, array [IMGLEN] of {* => byte 0});
iob := bufio->open(path, Sys->OREAD);
if (iob == nil)
error(sys->sprint("cannot open %s: %r", path));
lnum := 0;
while ((s := iob.gets('\n')) != nil) {
lnum++;
slen := len s;
# trim trailing space
while (slen > 0) {
ch := s[slen -1];
if (ch == ' ' || ch == '\r' || ch == '\n') {
slen--;
continue;
}
break;
}
# ignore blank lines
if (slen == 0)
continue;
if (slen < 10)
# STNNAAAACC
error("short S-record: line " + string lnum);
s = s[0:slen];
t := s[1];
if (s[0] != 'S' || t < '0' || t > '9')
error("bad S-record format: line " + string lnum);
data := hex2bytes(s[2:]);
if (data == nil)
error("bad chars in S-record: line " + string lnum);
count := int data[0];
cksum := int data[len data - 1];
if (count != len data -1)
error("S-record length mis-match: line " + string lnum);
if (sum(data[0:len data -1]) & 16rff != 16rff)
error("bad S-record checksum: line " + string lnum);
alen : int;
case t {
'0' =>
# addr[2] mname[10] ver rev desc[18] cksum
continue;
'1' =>
# 16-bit address, data
alen = 2;
'2' =>
# 24-bit address, data
alen = 3;
'3' =>
# 32-bit address, data
alen = 4;
'4' =>
# extension record
error("bad S-record type: line " + string lnum);
'5' =>
# data record count - ignore
continue;
'6' =>
# unused - ignore
continue;
'7' =>
img.start = wordval(data, 1, 4);
continue;
'8' =>
img.start = wordval(data, 1, 3);
continue;
'9' =>
img.start = wordval(data, 1, 2);
continue;
}
addr := wordval(data, 1, alen) - img.offset;
if (addr < 0 || addr > len img.data)
error("S-record address out of range: line " + string lnum);
img.data[addr:] = data[1+alen:1+count];
img.length = max(img.length, addr + count -(alen +1));
}
iob.close();
return img;
}
wordval(src : array of byte, s, l : int) : int
{
r := 0;
for (i := 0; i < l; i++) {
r <<= 8;
r += int src[s+i];
}
return r;
}
max(a, b : int) : int
{
if (a > b)
return a;
return b;
}
hex2bytes(s : string) : array of byte
{
slen := len s;
if (slen & 1)
# should be even
return nil;
data := array [slen/2] of byte;
six := 0;
dix := 0;
while (six < slen) {
d1 := hexdigit(s[six++]);
d2 := hexdigit(s[six++]);
if (d1 == -1 || d2 == -1)
return nil;
data[dix++] = byte ((d1 << 4) + d2);
}
return data;
}
hexdigit(h : int) : int
{
if (h >= '0' && h <= '9')
return h - '0';
if (h >= 'A' && h <= 'F')
return 10 + h - 'A';
if (h >= 'a' && h <= 'f')
return 10 + h - 'a';
return -1;
}