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Extend measuring range of thermocouple for MAX31855

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This commit is contained in:
esenapaj 2016-10-17 01:30:04 +09:00
parent 483082387c
commit 70e287ca8c
2 changed files with 11 additions and 3 deletions
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4
Marlin/Conditionals_post.h
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@ -222,8 +222,12 @@
#if TEMP_SENSOR_0 == -3
#define HEATER_0_USES_MAX6675
#define MAX6675_IS_MAX31855
#define MAX6675_TMIN -270
#define MAX6675_TMAX 1800
#elif TEMP_SENSOR_0 == -2
#define HEATER_0_USES_MAX6675
#define MAX6675_TMIN 0
#define MAX6675_TMAX 1024
#elif TEMP_SENSOR_0 == -1
#define HEATER_0_USES_AD595
#elif TEMP_SENSOR_0 == 0

10
Marlin/temperature.cpp
View File

@ -669,8 +669,8 @@ void Temperature::manage_heater() {
updateTemperaturesFromRawValues(); // also resets the watchdog
#if ENABLED(HEATER_0_USES_MAX6675)
if (current_temperature[0] > min(HEATER_0_MAXTEMP, 1023)) max_temp_error(0);
if (current_temperature[0] < max(HEATER_0_MINTEMP, 0.01)) min_temp_error(0);
if (current_temperature[0] > min(HEATER_0_MAXTEMP, MAX6675_TMAX - 1)) max_temp_error(0);
if (current_temperature[0] < max(HEATER_0_MINTEMP, MAX6675_TMIN + 0.01)) min_temp_error(0);
#endif
#if (ENABLED(THERMAL_PROTECTION_HOTENDS) && WATCH_TEMP_PERIOD > 0) || (ENABLED(THERMAL_PROTECTION_BED) && WATCH_BED_TEMP_PERIOD > 0) || DISABLED(PIDTEMPBED) || HAS_AUTO_FAN
@ -1355,10 +1355,14 @@ void Temperature::disable_all_heaters() {
#else
SERIAL_ERRORLNPGM("MAX6675");
#endif
max6675_temp = 4000; // thermocouple open
max6675_temp = MAX6675_TMAX * 4; // thermocouple open
}
else
max6675_temp >>= MAX6675_DISCARD_BITS;
#if ENABLED(MAX6675_IS_MAX31855)
// Support negative temperature
if (max6675_temp & 0x00002000) max6675_temp |= 0xffffc000;
#endif
return (int)max6675_temp;
}