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Merge pull request #1570 from C-o-r-E/escape_fix

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Fixes gCode handling of comments and escaped characters
This commit is contained in:
Scott Lahteine 2015-03-06 15:09:35 -08:00
commit 254970c92a
2 changed files with 108 additions and 76 deletions
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22
Documentation/GCodes.md
View File

@ -101,3 +101,25 @@
* M908 - Control digital trimpot directly.
* M928 - Start SD logging (M928 filename.g) - ended by M29
* M999 - Restart after being stopped by error
# Comments
Comments start at a `;` (semicolon) and end with the end of the line:
N3 T0*57 ; This is a comment
N4 G92 E0*67
; So is this
N5 G28*22
(example taken from the [RepRap wiki](http://reprap.org/wiki/Gcode#Comments))
If you need to use a literal `;` somewhere (for example within `M117`), you can escape semicolons with a `\`
(backslash):
M117 Hello \;)
`\` can also be used to escape `\` itself, if you need a literal `\` in front of a `;`:
M117 backslash: \\;and a comment
Please note that hosts should strip any comments before sending GCODE to the printer in order to save bandwidth.

162
Marlin/Marlin_main.cpp
View File

@ -730,103 +730,113 @@ void get_command()
serial_char = MYSERIAL.read();
if(serial_char == '\n' ||
serial_char == '\r' ||
(serial_char == ':' && comment_mode == false) ||
serial_count >= (MAX_CMD_SIZE - 1) )
{
if(!serial_count) { //if empty line
comment_mode = false; //for new command
// end of line == end of comment
comment_mode = false;
if(!serial_count) {
// short cut for empty lines
return;
}
cmdbuffer[bufindw][serial_count] = 0; //terminate string
if(!comment_mode){
comment_mode = false; //for new command
fromsd[bufindw] = false;
if(strchr(cmdbuffer[bufindw], 'N') != NULL)
fromsd[bufindw] = false;
if(strchr(cmdbuffer[bufindw], 'N') != NULL)
{
strchr_pointer = strchr(cmdbuffer[bufindw], 'N');
gcode_N = (strtol(strchr_pointer + 1, NULL, 10));
if(gcode_N != gcode_LastN+1 && (strstr_P(cmdbuffer[bufindw], PSTR("M110")) == NULL) ) {
SERIAL_ERROR_START;
SERIAL_ERRORPGM(MSG_ERR_LINE_NO);
SERIAL_ERRORLN(gcode_LastN);
//Serial.println(gcode_N);
FlushSerialRequestResend();
serial_count = 0;
return;
}
if(strchr(cmdbuffer[bufindw], '*') != NULL)
{
strchr_pointer = strchr(cmdbuffer[bufindw], 'N');
gcode_N = (strtol(strchr_pointer + 1, NULL, 10));
if(gcode_N != gcode_LastN+1 && (strstr_P(cmdbuffer[bufindw], PSTR("M110")) == NULL) ) {
SERIAL_ERROR_START;
SERIAL_ERRORPGM(MSG_ERR_LINE_NO);
SERIAL_ERRORLN(gcode_LastN);
//Serial.println(gcode_N);
FlushSerialRequestResend();
serial_count = 0;
return;
}
byte checksum = 0;
byte count = 0;
while(cmdbuffer[bufindw][count] != '*') checksum = checksum^cmdbuffer[bufindw][count++];
strchr_pointer = strchr(cmdbuffer[bufindw], '*');
if(strchr(cmdbuffer[bufindw], '*') != NULL)
{
byte checksum = 0;
byte count = 0;
while(cmdbuffer[bufindw][count] != '*') checksum = checksum^cmdbuffer[bufindw][count++];
strchr_pointer = strchr(cmdbuffer[bufindw], '*');
if( (int)(strtod(strchr_pointer + 1, NULL)) != checksum) {
SERIAL_ERROR_START;
SERIAL_ERRORPGM(MSG_ERR_CHECKSUM_MISMATCH);
SERIAL_ERRORLN(gcode_LastN);
FlushSerialRequestResend();
serial_count = 0;
return;
}
//if no errors, continue parsing
}
else
{
if( (int)(strtod(strchr_pointer + 1, NULL)) != checksum) {
SERIAL_ERROR_START;
SERIAL_ERRORPGM(MSG_ERR_NO_CHECKSUM);
SERIAL_ERRORPGM(MSG_ERR_CHECKSUM_MISMATCH);
SERIAL_ERRORLN(gcode_LastN);
FlushSerialRequestResend();
serial_count = 0;
return;
}
gcode_LastN = gcode_N;
//if no errors, continue parsing
}
else // if we don't receive 'N' but still see '*'
else
{
if((strchr(cmdbuffer[bufindw], '*') != NULL))
{
SERIAL_ERROR_START;
SERIAL_ERRORPGM(MSG_ERR_NO_LINENUMBER_WITH_CHECKSUM);
SERIAL_ERRORLN(gcode_LastN);
serial_count = 0;
return;
}
}
if((strchr(cmdbuffer[bufindw], 'G') != NULL)){
strchr_pointer = strchr(cmdbuffer[bufindw], 'G');
switch((int)((strtod(strchr_pointer + 1, NULL)))){
case 0:
case 1:
case 2:
case 3:
if (Stopped == true) {
SERIAL_ERRORLNPGM(MSG_ERR_STOPPED);
LCD_MESSAGEPGM(MSG_STOPPED);
}
break;
default:
break;
}
SERIAL_ERROR_START;
SERIAL_ERRORPGM(MSG_ERR_NO_CHECKSUM);
SERIAL_ERRORLN(gcode_LastN);
FlushSerialRequestResend();
serial_count = 0;
return;
}
//If command was e-stop process now
if(strcmp(cmdbuffer[bufindw], "M112") == 0)
kill();
bufindw = (bufindw + 1)%BUFSIZE;
buflen += 1;
gcode_LastN = gcode_N;
//if no errors, continue parsing
}
else // if we don't receive 'N' but still see '*'
{
if((strchr(cmdbuffer[bufindw], '*') != NULL))
{
SERIAL_ERROR_START;
SERIAL_ERRORPGM(MSG_ERR_NO_LINENUMBER_WITH_CHECKSUM);
SERIAL_ERRORLN(gcode_LastN);
serial_count = 0;
return;
}
}
if((strchr(cmdbuffer[bufindw], 'G') != NULL)){
strchr_pointer = strchr(cmdbuffer[bufindw], 'G');
switch((int)((strtod(strchr_pointer + 1, NULL)))){
case 0:
case 1:
case 2:
case 3:
if (Stopped == true) {
SERIAL_ERRORLNPGM(MSG_ERR_STOPPED);
LCD_MESSAGEPGM(MSG_STOPPED);
}
break;
default:
break;
}
}
//If command was e-stop process now
if(strcmp(cmdbuffer[bufindw], "M112") == 0)
kill();
bufindw = (bufindw + 1)%BUFSIZE;
buflen += 1;
serial_count = 0; //clear buffer
}
else
{
if(serial_char == ';') comment_mode = true;
if(!comment_mode) cmdbuffer[bufindw][serial_count++] = serial_char;
else if(serial_char == '\\') { //Handle escapes
if(MYSERIAL.available() > 0 && buflen < BUFSIZE) {
// if we have one more character, copy it over
serial_char = MYSERIAL.read();
cmdbuffer[bufindw][serial_count++] = serial_char;
}
//otherwise do nothing
}
else { // its not a newline, carriage return or escape char
if(serial_char == ';') comment_mode = true;
if(!comment_mode) cmdbuffer[bufindw][serial_count++] = serial_char;
}
}
#ifdef SDSUPPORT