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