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detection of faulty RAMBo (incorrect capacitor on fan tach pin) for MK3/S

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DRracer 2019-07-23 15:55:53 +02:00
parent a59e7090ea
commit 6860a572c2
1 changed files with 52 additions and 0 deletions
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52
Firmware/Marlin_main.cpp
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@ -3274,6 +3274,56 @@ static void gcode_PRUSA_SN()
puts_P(_N("Not in farm mode."));
}
}
//! Detection of faulty RAMBo 1.1b boards equipped with bigger capacitors
//! at the TACH_1 pin, which causes bad detection of print fan speed.
//! Warning: This function is not to be used by ordinary users, it is here only for automated testing purposes,
//! it may even interfere with other functions of the printer! You have been warned!
//! The test idea is to measure the time necessary to charge the capacitor.
//! So the algorithm is as follows:
//! 1. Set TACH_1 pin to INPUT mode and LOW
//! 2. Wait a few ms
//! 3. disable interrupts and measure the time until the TACH_1 pin reaches HIGH
//! Repeat 1.-3. several times
//! Good RAMBo's times are in the range of approx. 260-320 us
//! Bad RAMBo's times are approx. 260-1200 us
//! So basically we are interested in maximum time, the minima are mostly the same.
//! May be that's why the bad RAMBo's still produce some fan RPM reading, but not corresponding to reality
static void gcode_PRUSA_BadRAMBoFanTest(){
//printf_P(PSTR("Enter fan pin test\n"));
#if !defined(DEBUG_DISABLE_FANCHECK) && defined(FANCHECK) && defined(TACH_1) && TACH_1 >-1
fan_measuring = false; // prevent EXTINT7 breaking into the measurement
unsigned long tach1max = 0;
uint8_t tach1cntr = 0;
for( /* nothing */; tach1cntr < 100; ++tach1cntr){
//printf_P(PSTR("TACH_1: %d\n"), tach1cntr);
SET_OUTPUT(TACH_1);
WRITE(TACH_1, LOW);
delay2(20); // the delay may be lower
unsigned long tachMeasure = micros2();
cli();
SET_INPUT(TACH_1);
// just wait brutally in an endless cycle until we reach HIGH
// if this becomes a problem it may be improved to non-endless cycle
while( READ(TACH_1) == 0 ) ;
sei();
tachMeasure = micros2() - tachMeasure;
if( tach1max < tachMeasure )
tach1max = tachMeasure;
//printf_P(PSTR("TACH_1: %d: capacitor check time=%lu us\n"), (int)tach1cntr, tachMeasure);
}
//printf_P(PSTR("TACH_1: max=%lu us\n"), tach1max);
SERIAL_PROTOCOLPGM("RAMBo FAN ");
if( tach1max > 500 ){
// bad RAMBo
SERIAL_PROTOCOLLNPGM("BAD");
} else {
SERIAL_PROTOCOLLNPGM("OK");
}
// cleanup after the test function
SET_INPUT(TACH_1);
WRITE(TACH_1, HIGH);
#endif
}
#ifdef BACKLASH_X
extern uint8_t st_backlash_x;
@ -3559,6 +3609,8 @@ void process_commands()
else if (code_seen("PRN")) { //! PRUSA PRN
printf_P(_N("%d"), status_number);
} else if( code_seen("FANPINTST") ){
gcode_PRUSA_BadRAMBoFanTest();
}else if (code_seen("FAN")) { //! PRUSA FAN
printf_P(_N("E0:%d RPM\nPRN0:%d RPM\n"), 60*fan_speed[0], 60*fan_speed[1]);
}else if (code_seen("fn")) { //! PRUSA fn