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avrdude: Line noise prevention on MK3 xflash boot

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This commit is contained in:
Vojtech Kral 2018-06-20 14:08:41 +02:00
parent cea5b97cad
commit f8bbfad152
1 changed files with 9 additions and 2 deletions
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11
xs/src/avrdude/arduino.c
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@ -99,7 +99,7 @@ static int prusa_init_external_flash(PROGRAMMER * pgm)
avrdude_message(MSG_INFO, "%s: prusa_init_external_flash(): MK3 printer did not boot up on time or serial communication failed\n", progname); avrdude_message(MSG_INFO, "%s: prusa_init_external_flash(): MK3 printer did not boot up on time or serial communication failed\n", progname);
return -1; return -1;
} else if (strncmp(buffer, entry_magic_send, recv_size) != 0) { } else if (strncmp(buffer, entry_magic_send, recv_size) != 0) {
avrdude_message(MSG_INFO, "%s: prusa_init_external_flash(): MK3 printer emitted incorrect start code\n", progname); avrdude_message(MSG_INFO, "%s: prusa_init_external_flash(): MK3 printer emitted incorrect start code: `%*s`\n", progname, recv_size, buffer);
return -1; return -1;
} }
@ -116,7 +116,7 @@ static int prusa_init_external_flash(PROGRAMMER * pgm)
avrdude_message(MSG_INFO, "%s: prusa_init_external_flash(): MK3 printer did not boot up on time or serial communication failed\n", progname); avrdude_message(MSG_INFO, "%s: prusa_init_external_flash(): MK3 printer did not boot up on time or serial communication failed\n", progname);
return -1; return -1;
} else if (strncmp(buffer, entry_magic_cfm, recv_size) != 0) { } else if (strncmp(buffer, entry_magic_cfm, recv_size) != 0) {
avrdude_message(MSG_INFO, "%s: prusa_init_external_flash(): MK3 printer emitted incorrect start code\n", progname); avrdude_message(MSG_INFO, "%s: prusa_init_external_flash(): MK3 printer emitted incorrect cfm code: `%*s`\n", progname, recv_size, buffer);
return -1; return -1;
} }
@ -140,6 +140,13 @@ static int arduino_open(PROGRAMMER * pgm, char * port)
serial_set_dtr_rts(&pgm->fd, 1); serial_set_dtr_rts(&pgm->fd, 1);
usleep(50*1000); usleep(50*1000);
// Sometimes there may be line noise generating input on the printer's USB-to-serial IC
// Here we try to clean its input buffer with a sequence of newlines (a minimum of 9 is needed):
const char cleanup_newlines[] = "\n\n\n\n\n\n\n\n\n\n";
if (serial_send(&pgm->fd, cleanup_newlines, sizeof(cleanup_newlines) - 1) < 0) {
return -1;
}
/* /*
* drain any extraneous input * drain any extraneous input
*/ */