Implement command parser up to second parameter

The command parser has been implemented for all options other than the
config option.

See #1

prosjekt.X/command-handler.c

@@ -1,5 +1,131 @@
 #include "command-handler.h"
 
-command_t parse_command(char *command_str);
+command_context_t parse_command(uint8_t *command, uint8_t command_len) {
+  // Create the context
+  command_context_t context;
 
-void route_command(command_t command);
+  ///////////////////////
+  // Command selection //
+  ///////////////////////
+
+  // Validate that we have a command
+  if (command_len < 1) {
+    context.command = UNKNOWN_COMMAND;
+    return context;
+  }
+
+  // Figure out which command to run
+  switch (command[0]) {
+  case 0x11: // Read config
+    context.command = READ_CONFIG;
+    break;
+  case 0x12: // Read voltage
+    context.command = READ_VOLTAGE;
+    break;
+  case 0x13: // Read temperature
+    context.command = READ_TERMPERATURE;
+    break;
+  case 0x14: // Read current fan speed
+    context.command = READ_FAN_SPEED;
+    break;
+  case 0x15: // Read bulk fan speed
+    context.command = READ_BULK_FAN_SPEED;
+    break;
+  case 0x21: // Write config
+    context.command = WRITE_CONFIG;
+    break;
+  case 0x22: // Clear stored fan speed data
+    context.command = CLEAR_BULK_FAN_SPEED;
+    break;
+  default: // Unrecognized command
+    context.command = UNKNOWN_COMMAND;
+    break;
+  }
+
+  ///////////////////////////////
+  // First parameter selection //
+  ///////////////////////////////
+
+  // Check if the command does not require a parameter. If it does not, return.
+  if (context.command == READ_TERMPERATURE) {
+    return context;
+  }
+
+  // Validate that we have a first parameter, else requirements for command are
+  // not fulfilled. return unknown command.
+  if (command_len < 2) {
+    context.command = UNKNOWN_COMMAND;
+    return context;
+  }
+
+  // Store the parameter
+  uint8_t param = command[1];
+
+  // Extract the parameter. Parameter is dependent on command
+  switch (command[0]) {
+  // Configuration parameters
+  case 0x11: // Read config
+  case 0x21: // Write config
+    // TODO: Handle parameters for config
+    break;
+
+  // Voltage parameters
+  case 0x12: // Read voltage
+    if (param == 0x01) {
+      context.src_voltage = SRC_INTERNAL;
+    } else if (param == 0x02) {
+      context.src_voltage = SRC_EXTRNAL;
+    } else if (param == 0x03) {
+      context.src_voltage = SRC_THERMISTOR;
+    } else {
+      context.src_voltage = SRC_NONE;
+    }
+    break;
+
+  // Fan parameters
+  case 0x14: // Read current fan speed
+  case 0x15: // Read bulk fan speed
+  case 0x22: // Clear stored fan speed data
+    context.command = READ_BULK_FAN_SPEED;
+    if (param == 0x01) {
+      context.fan = FAN1;
+    } else if (param == 0x02) {
+      context.fan = FAN2;
+    } else {
+      context.fan = FAN_NONE;
+    }
+    break;
+
+  // This should never be reached
+  default: // Unrecognized command
+    context.command = UNKNOWN_COMMAND;
+    break;
+  }
+
+  ////////////////////////////////
+  // Second parameter selection //
+  ////////////////////////////////
+
+  // Check if the command does not require a second parameter. If it does not,
+  // return. Only config write requires a second parameter.
+  if (context.command != WRITE_CONFIG) {
+    return context;
+  }
+
+  // Validate that we have a first parameter, else requirements for command are
+  // not fulfilled. return unknown command.
+  if (command_len < 3) {
+    context.command = UNKNOWN_COMMAND;
+    return context;
+  }
+
+  // Store the parameter
+  param = command[2];
+
+  // TODO: Handle the config parameters
+
+  // Return the context
+  return context;
+}
+
+void route_command(command_context_t command);

prosjekt.X/command-handler.h

@@ -12,9 +12,12 @@
 extern "C" {
 #endif
 
+#include <stdint.h>
+#include <string.h>
+
 // Enum of all valid command types
 typedef enum {
-  WRITE_CHANGE,         // Change the configuration
+  WRITE_CONFIG,         // Change the configuration
   READ_CONFIG,          // Read, and print the current configuration
   READ_VOLTAGE,         // Read, and print a voltage
   READ_TERMPERATURE,    // Read, and print the temperature
@@ -28,6 +31,7 @@ typedef enum {
 typedef enum {
   SRC_INTERNAL,   // Internal volage
   SRC_EXTRNAL,    // External voltage
+  SRC_THERMISTOR, // Thermistor voltage
   SRC_NONE        // No voltage source selected
 } src_voltage_t;
 
@@ -49,11 +53,13 @@ typedef enum {
 typedef struct {
   command_t command;         // The command to execute
   src_voltage_t src_voltage; // The selected voltage source
+  fans_t fan;                // The selected fan
   config_option_t conf;      // The configuration option to cange
+                             // TODO: Add config value field for writing
 } command_context_t;
 
 // Parses the input string and outputs one of the valid commands
-command_context_t parse_command(char *command_str);
+command_context_t parse_command(uint8_t *command, uint8_t command_len);
 
 // Routes the provided command to the appropriate function to handle it
 void route_command(command_context_t command);