From af3538850539e0b306651ba63f3b941b8d208372 Mon Sep 17 00:00:00 2001
From: BlackMark <me@blackmark.me>
Date: Wed, 1 Apr 2020 02:27:28 +0200
Subject: [PATCH] Add basic terminal

---
 fantemp/fantemp.cppproj |  3 ++
 fantemp/main.cpp        | 12 +++---
 fantemp/terminal.hpp    | 86 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 95 insertions(+), 6 deletions(-)
 create mode 100644 fantemp/terminal.hpp

diff --git a/fantemp/fantemp.cppproj b/fantemp/fantemp.cppproj
index 3c2f23a..35bbaeb 100644
--- a/fantemp/fantemp.cppproj
+++ b/fantemp/fantemp.cppproj
@@ -218,6 +218,9 @@
     <Compile Include="pwm.hpp">
       <SubType>compile</SubType>
     </Compile>
+    <Compile Include="terminal.hpp">
+      <SubType>compile</SubType>
+    </Compile>
     <Compile Include="thermistor.cpp">
       <SubType>compile</SubType>
     </Compile>
diff --git a/fantemp/main.cpp b/fantemp/main.cpp
index 961403b..ec0f3f6 100644
--- a/fantemp/main.cpp
+++ b/fantemp/main.cpp
@@ -13,6 +13,7 @@
 #include "uart/hardware0.hpp"
 
 #include "pwm.hpp"
+#include "terminal.hpp"
 #include "thermistor.hpp"
 
 template <typename T>
@@ -34,9 +35,8 @@ uint8_t temperatureCurve(double temperature)
 int main()
 {
 	uart::Uart0<uart::Config<115200>> serial;
-	serial.init();
-
-	serial << F("Thermistor reader\r\n");
+	Terminal<decltype(serial)> terminal;
+	terminal.init();
 
 	using adc_conf = adc::Config<adc::SingleMode>;
 
@@ -54,7 +54,7 @@ int main()
 		const auto temperature = temp.getTemperature(fantempResistance);
 		const auto fanSpeed = temperatureCurve(temperature);
 
-		char floatBuffer[16];
+		/*char floatBuffer[16];
 
 		sprintf(floatBuffer, "%.2f", adcSample);
 		serial << F("Read ADC: ") << floatBuffer << F("\r\n");
@@ -62,11 +62,11 @@ int main()
 		serial << F("Resistance: ") << floatBuffer << F("\r\n");
 		sprintf(floatBuffer, "%.2f", temperature);
 		serial << F("Temperature: ") << floatBuffer << F(" C \r\n");
-		serial << F("Fan speed: ") << fanSpeed << F("%\r\n");
+		serial << F("Fan speed: ") << fanSpeed << F("%\r\n");*/
 
 		pwm::setDuty(fanSpeed);
 
-		_delay_ms(1000);
+		terminal.callback();
 	}
 
 	serial.flushTx();
diff --git a/fantemp/terminal.hpp b/fantemp/terminal.hpp
new file mode 100644
index 0000000..8b10923
--- /dev/null
+++ b/fantemp/terminal.hpp
@@ -0,0 +1,86 @@
+#pragma once
+
+#include <ctype.h>
+#include <stdint.h>
+
+#include "flash/flash.hpp"
+
+#define ENDL F("\r\n")
+
+template <class Uart>
+class Terminal {
+  public:
+	static void init()
+	{
+		m_serial.init();
+
+		m_serial << ENDL << F("FanTemp Control Panel") << ENDL << ENDL << F("$ ");
+	}
+
+	static void callback()
+	{
+		uint8_t inputByte;
+		bool handleInput = false;
+
+		while (m_serial.rxByte(inputByte)) {
+			if (isprint(inputByte) || inputByte == 0x03) {
+				m_inputBuffer[m_inputSize++] = inputByte;
+
+				// Handle Ctrl + C
+				if (inputByte == 0x03) {
+					m_serial << F("^C");
+					handleInput = true;
+					break;
+				}
+				// Echo
+				else {
+					m_serial << static_cast<char>(inputByte);
+				}
+			}
+
+			// Handle backspace
+			if (inputByte == 0x7f && m_inputSize > 0) {
+				m_serial << static_cast<char>(0x7f);
+				--m_inputSize;
+			}
+			// Handle line terminator
+			else if (inputByte == '\r' || inputByte == '\n') {
+				// Consume possible second line terminator
+				if (m_serial.peek(inputByte) && (inputByte == '\r' || inputByte == '\n')) {
+					m_serial.rxByte(inputByte);
+				}
+				handleInput = true;
+				break;
+			}
+
+			if (m_inputSize >= INPUT_BUFFER_SIZE) {
+				m_serial << ENDL << F("WARNING: Terminal input buffer overflow!") << ENDL;
+				handleInput = true;
+				break;
+			}
+		}
+
+		if (handleInput) {
+			parseInput();
+			m_inputSize = 0;
+			m_serial << ENDL << F("$ ");
+		}
+	}
+
+  private:
+	static constexpr auto INPUT_BUFFER_SIZE = 128;
+
+	static Uart m_serial;
+	static char m_inputBuffer[INPUT_BUFFER_SIZE];
+	static uint16_t m_inputSize;
+
+	static void parseInput() {}
+};
+
+template <class Uart>
+char Terminal<Uart>::m_inputBuffer[INPUT_BUFFER_SIZE];
+
+template <class Uart>
+uint16_t Terminal<Uart>::m_inputSize = 0;
+
+#undef ENDL