Implement setting fan speed manually

fantemp/controller.cpp

@@ -8,6 +8,7 @@ double Controller::m_resistance;
 double Controller::m_temperature;
 uint8_t Controller::m_fanSpeed;
 bool Controller::m_dataAvailable = false;
+bool Controller::m_autoMode = true;
 
 volatile uint32_t Controller::m_adcSampleSum;
 volatile bool Controller::m_adcSampleReady = false;
@@ -28,6 +29,8 @@ void Controller::callback()
 
 		m_resistance = m_thermistor.getResistance(m_adcSample);
 		m_temperature = m_thermistor.getTemperature(m_resistance);
+
+		if (m_autoMode)
 			m_fanSpeed = mapTemperature(m_temperature);
 
 		pwm::setDuty(m_fanSpeed);

fantemp/controller.hpp

@@ -13,6 +13,7 @@ class Controller {
 	static double m_temperature;
 	static uint8_t m_fanSpeed;
 	static bool m_dataAvailable;
+	static bool m_autoMode;
 
 	static void init();
 

fantemp/terminal.hpp

@@ -22,11 +22,13 @@ GF(MONITOR_CMD, "monitor");
 GF(BOOTLOADER_CMD, "bootloader");
 GF(UPTIME_CMD, "uptime");
 GF(STATISTICS_CMD, "statistics");
-GF(RESET_CMD, "reset");
 GF(HISTOGRAM_CMD, "histogram");
+GF(RESET_CMD, "reset");
+GF(SET_CMD, "set");
+GF(AUTO_CMD, "auto");
 
 GF(VERSION_CMD, "version");
-GF(VERSION, "1.7");
+GF(VERSION, "1.8");
 
 static inline bool substringEquals(const char *str, const ::detail::FlashString *flashStr, const size_t &size)
 {
@@ -128,6 +130,26 @@ class Terminal {
 		return false;
 	}
 
+	static uint8_t parseFanSpeed()
+	{
+		const auto setCmdLen = strlen_P(reinterpret_cast<const char *>(detail::SET_CMD));
+
+		if (m_inputSize > setCmdLen && substringEquals(m_inputBuffer, detail::SET_CMD, setCmdLen) &&
+		    m_inputSize < INPUT_BUFFER_SIZE) {
+			m_inputBuffer[m_inputSize] = '\0'; // Null terminate to be parsable by stdlib
+			const auto *fanSpeedStr = m_inputBuffer + setCmdLen;
+			auto *fanSpeedStrEnd = m_inputBuffer + setCmdLen;
+			const auto fanSpeed = strtol(fanSpeedStr, &fanSpeedStrEnd, 10);
+
+			if (fanSpeedStrEnd != fanSpeedStr && *fanSpeedStr != '\0' && *fanSpeedStrEnd == '\0') {
+				if (fanSpeed >= 0 && fanSpeed <= 100)
+					return static_cast<uint8_t>(fanSpeed);
+			}
+		}
+
+		return 0xFF;
+	}
+
 	static void parseInput()
 	{
 		if (m_inputSize) {
@@ -152,6 +174,10 @@ class Terminal {
 					printHistogram();
 				} else if (stringEquals(m_inputBuffer, detail::RESET_CMD, m_inputSize)) {
 					handleReset();
+				} else if (uint8_t targetFanSpeed = parseFanSpeed(); targetFanSpeed <= 100) {
+					handleSet(targetFanSpeed);
+				} else if (substringEquals(m_inputBuffer, detail::AUTO_CMD, m_inputSize)) {
+					handleAuto();
 				} else if (substringEquals(m_inputBuffer, detail::VERSION_CMD, m_inputSize)) {
 					printVersion();
 				} else {
@@ -183,6 +209,8 @@ class Terminal {
 		m_serial << detail::STATISTICS_CMD << F(" .: prints overall statistics like min and max temp") << detail::ENDL;
 		m_serial << detail::HISTOGRAM_CMD << F(" ..: prints a histogram of the temperature") << detail::ENDL;
 		m_serial << detail::RESET_CMD << F(" ......: resets statistics to 0 in EEPROM and RAM") << detail::ENDL;
+		m_serial << detail::SET_CMD << F(" ........: sets the fan speed to the provided value") << detail::ENDL;
+		m_serial << detail::AUTO_CMD << F(" .......: turns on automatic fan control") << detail::ENDL;
 		m_serial << detail::VERSION_CMD << F(" ....: displays firmware version") << detail::ENDL;
 	}
 
@@ -306,6 +334,21 @@ class Terminal {
 		m_serial << F("Reset statistics") << detail::ENDL;
 	}
 
+	static void handleSet(uint8_t targetFanSpeed)
+	{
+		m_serial << F("Setting fan speed to ");
+		m_serial.txNumber(targetFanSpeed);
+		m_serial << detail::ENDL;
+		Controller::m_autoMode = false;
+		Controller::m_fanSpeed = targetFanSpeed;
+	}
+
+	static void handleAuto()
+	{
+		m_serial << F("Turning on automatic fan control") << detail::ENDL;
+		Controller::m_autoMode = true;
+	}
+
 	static void printVersion()
 	{
 		m_serial << F("FanTemp v") << detail::VERSION << detail::ENDL;