Merge remote-tracking branch 'origin/combine-all'

This avoids the problem where the current index has outdated data.
It does however mean the first piece of stored data is empty, but it is
a worthwile tradeoff.

prosjekt.X/command-handler.c

@@ -0,0 +1,307 @@
+#include "command-handler.h"
+#include "fan-speed.h"
+
+// Initialize empty, global command context
+volatile command_context_t context = {UNKNOWN_COMMAND, SRC_NONE, FAN_NONE,
+                                      CNF_NONE};
+
+void parse_command(uint8_t command[], uint8_t command_len) {
+  ///////////////////////
+  // Command selection //
+  ///////////////////////
+
+  // Validate that we have a command
+  if (command_len < 1) {
+    context.command = UNKNOWN_COMMAND;
+  }
+
+  // Extract the first byte, which contains the command
+  uint8_t command_byte = command[0];
+
+  // Figure out which command to run
+  switch (command_byte) {
+  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;
+  }
+
+  // Validate that we have a second parameter, else requirements for command are
+  // not fulfilled. return unknown command.
+  if (command_len < 2) {
+    context.command = UNKNOWN_COMMAND;
+    return;
+  }
+
+  // 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
+      if (param == 0x01) {
+          context.conf = SAMPLE_TIME;
+      } else {
+          context.conf = CNF_NONE;
+      }
+    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
+    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;
+  }
+
+  /////////////////////////////////
+  //  Third 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;
+  }
+
+  // Validate that we have a third parameter, else requirements for command are
+  // not fulfilled. return unknown command.
+  if (command_len < 3) {
+    context.command = UNKNOWN_COMMAND;
+    return;
+  }
+
+  // Store the parameter
+  param = command[1];
+
+  context.conf = param;
+  
+
+  ////////////////////////////////
+  // Fourth parameter selection //
+  ////////////////////////////////
+  
+  // Validate that we have a fourth parameter, else requirements for command are
+  // not fulfilled. return unknown command. Second parameter is u16, thus two bytes.
+  if (command_len < 4) {
+    context.command = UNKNOWN_COMMAND;
+    return;
+  }
+  
+  // Extract the value
+  union {
+      uint16_t value;
+      uint8_t bytes[2];
+  } config_value;
+  
+  config_value.bytes[0] = command[2];
+  config_value.bytes[1] = command[3];
+  
+  // Store the value
+  context.conf_val = config_value.value;
+  
+  // exit
+  return;
+}
+
+uint8_t route_command(int pos) {
+ switch (context.command) {
+    case WRITE_CONFIG:
+        switch (context.conf) {
+            case SAMPLE_TIME:
+                // Overwrite the config value
+                config.ms_fanspeed_sample_rate = context.conf_val;
+                
+                // Set the flag to store it in the EEPROM
+                store_config = true;
+                return 0;
+                break;
+            case CNF_NONE:
+                return 0;
+                break;
+        }
+        break;
+    case READ_CONFIG:
+    {
+        switch (context.conf) {
+            case SAMPLE_TIME:
+            {
+                // Validate that pos is within the valid range
+                if (pos >= 2) { return 0x00; }
+                
+                // Config only has one parameter so we sent that parameter
+                // Create a union to store the data
+                union {
+                    uint16_t value;
+                    uint8_t bytes[2];
+                } config_value;
+                config_value.value = config.ms_fanspeed_sample_rate;
+        
+                // Return the corresponding data byte
+                return config_value.bytes[1-pos];
+            }
+            break;
+        } 
+    }
+    break;
+      
+    case READ_VOLTAGE:
+    {
+        // Validate that pos is within range
+        if (pos >= 2) { return 0; }
+        
+        // Create a union to store the data
+        union {
+            int16_t v;
+            uint8_t bytes[2];
+        } voltage;
+        
+        // Figure out which voltage source to read
+        switch (context.src_voltage) {
+            case SRC_INTERNAL:
+                voltage.v = internal_voltage_read();
+                break;
+            case SRC_EXTRNAL:
+                voltage.v = external_voltage_read();
+                break;
+            case SRC_THERMISTOR:
+                voltage.v = thermistor_voltage_read();
+                break;
+            default:
+                return 0xFF;
+                break;
+        }
+        
+        // Send the data
+        return voltage.bytes[1-pos];
+    }
+    case READ_TERMPERATURE:
+    {
+        uint16_t v_therm = thermistor_voltage_read();
+        union {
+            int16_t temp;
+            uint8_t bytes[2];
+        } temperature;
+        temperature.temp = (int16_t) ( calculate_thermistor_temp(v_therm) * 1000 );
+        return temperature.bytes[pos];
+    }
+        break;
+    case READ_FAN_SPEED:
+        // Validate that pos is within range
+        if (pos >= 2) { return 0; }
+        
+        // Union to hold the u16
+        if (context.fan == FAN1) {
+            union {
+                uint16_t val;
+                uint8_t bytes[2];
+            } speed;
+            
+            speed.val = fan1_history[fan1_history_index];
+            
+            return speed.bytes[1-pos];
+        } else if (context.fan == FAN2) {
+            union {
+                uint16_t val;
+                uint8_t bytes[2];
+            } speed;
+            
+            speed.val = fan2_history[fan2_history_index];
+            
+            return speed.bytes[1-pos];
+        } else {
+            return 0;
+        }
+        break;        
+    case READ_BULK_FAN_SPEED:
+        if (context.fan == FAN1) {
+            // Validate that pos is valid, if not return 0
+            if (pos >= 512) { return 0; }
+            
+            // Calculate the index position
+            int16_t index = fan1_history_index - pos;
+            if (index < 0) { index = 511-pos; }
+            
+            return fan1_history[index];
+        } else if (context.fan == FAN2) {
+            // Validate that pos is valid, if not return 0
+            if (pos >= 512) { return 0; }
+            
+            // Calculate the index position
+            int16_t index = fan2_history_index - pos;
+            if (index < 0) { index = 511-pos; }
+            
+            return fan2_history[index];
+        } else {
+            return 0;
+        }
+        break;
+    case CLEAR_BULK_FAN_SPEED:
+        // Overwrite the content of the desired fan array with zeroes
+        if (context.fan == FAN1) {
+            memset(fan1_history, 0, sizeof(fan1_history));
+        } else if (context.fan == FAN2) {
+            memset(fan2_history, 0, sizeof(fan2_history));
+        }
+        return 0;
+        break;
+    case UNKNOWN_COMMAND:
+    default:
+      return 0xFF;
+  }
+}

prosjekt.X/command-handler.h

@@ -0,0 +1,89 @@
+/*
+ * File:   command-handler.h
+ * Author: Sebastian H. Gabrielli
+ *
+ * Created on March 6, 2024, 12:43 PM
+ */
+
+#ifndef COMMAND_HANDLER_H
+#define COMMAND_HANDLER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "eeprom.h"
+#include <avr/io.h>
+#include <stdint.h>
+#include <string.h>
+#include "voltage.h"
+#include "themistor-temp.h"
+        
+// Enum of all valid command types
+typedef enum {
+  WRITE_CONFIG = 0x21,         // Change the configuration
+  READ_CONFIG = 0x11,          // Read, and print the current configuration
+  READ_VOLTAGE = 0x12,         // Read, and print a voltage
+  READ_TERMPERATURE = 0x13,    // Read, and print the temperature
+  READ_FAN_SPEED = 0x14,       // Read, and print the current fan speed
+  READ_BULK_FAN_SPEED = 0x15,  // Read, and print the stored back fan speed data
+  CLEAR_BULK_FAN_SPEED = 0x22, // Clear the buffer of stored fan speed data
+  UNKNOWN_COMMAND              // An unrecognized command has been sent
+} command_t;
+
+// Enum of all valid voltage sources
+typedef enum {
+  SRC_INTERNAL,   // Internal volage
+  SRC_EXTRNAL,    // External voltage
+  SRC_THERMISTOR, // Thermistor voltage
+  SRC_NONE        // No voltage source selected
+} src_voltage_t;
+
+// Enum of all valid config options
+// TODO: Move into config header file
+typedef enum {
+  SAMPLE_TIME = 0x01,   // Time between each fan speed sample
+  CNF_NONE,             // No config option
+} config_option_t;
+
+// Enum of all valid fans
+// TODO: Consider moving into it's own fan page
+typedef enum {
+  FAN1 = 1,    // The first fan
+  FAN2 = 2,    // The second fan
+  FAN_NONE // No fan
+} fans_t;
+
+// Struct with command context
+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
+  uint16_t conf_val;         // The value of the config option to change
+} command_context_t;
+
+// Fan history variables
+extern volatile uint16_t fan1_history[512];
+extern volatile uint16_t fan2_history[512];
+// Fan history index variable
+extern volatile uint16_t fan1_history_index;
+extern volatile uint16_t fan2_history_index;
+
+// Config
+extern volatile config_t config;
+extern volatile bool store_config;
+
+// Parses the input string and outputs one of the valid commands
+void parse_command(uint8_t *command, uint8_t command_len);
+
+// Routes the provided command to the appropriate function to handle it
+// If the command is a read command it then returns the current byte.
+// The position is the byte to read when multiple bytes are being read.
+uint8_t route_command(int pos);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* COMMAND_HANDLER_H */

prosjekt.X/eeprom.c

@@ -0,0 +1,42 @@
+#include "eeprom.h"
+
+// The start address for the controller data
+uint16_t EEMEM start_address_controller = 0x1400;
+
+// Checks if the EEPROM memory is ready to be written in and waits until it is.
+void check_eeprom_is_ready(){
+    while(1){
+        if (eeprom_is_ready()){
+            break;
+        }else{
+            ;
+        }
+    }
+}
+
+
+void write_struct_from_EEPROM(config_t write_struct){
+    // Calculate the required storage size
+    uint8_t struct_size = sizeof(write_struct);
+    
+    // Wait for the EEPROM to be ready
+    check_eeprom_is_ready();
+    
+    // Update the stored config stuct
+    eeprom_update_block((void*) &write_struct,(void*) &start_address_controller, struct_size);
+}
+
+config_t read_struct_from_EEPROM(){
+    // Create a config struct to hold the received data
+    config_t read_struct = { 0 };
+    uint8_t struct_size = sizeof(read_struct);
+    
+    // Wait for the EEPROM to be ready
+    check_eeprom_is_ready();
+    
+    // Read the data from the EEPROM
+    eeprom_read_block((void *) &read_struct,(void*) &start_address_controller, struct_size);
+    
+    // Return the data
+    return read_struct;
+}

prosjekt.X/eeprom.h

@@ -0,0 +1,46 @@
+/* 
+ * File:   eeprom.h
+ * Author: Helle Augland Grasmo, Sebastian H. Gabrielli
+ *
+ * Created on 06 March 2024, 15:30
+ */
+
+#ifndef EEPROM_H
+#define	EEPROM_H
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#include <avr/io.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <avr/eeprom.h>
+#include <stdbool.h>
+
+// The code is inspired by "EEPROM handling" form avr-libc
+// web link: https://www.nongnu.org/avr-libc/user-manual/group__avr__eeprom.html
+
+
+// Struct for information on the controller.
+typedef struct {
+    uint16_t ms_fanspeed_sample_rate;
+} config_t;
+
+// Check if EEPROM is ready to be written to
+void check_eeprom_is_ready();
+
+// Writes a config_t struct to the EEPROM
+void write_struct_from_EEPROM(config_t write_struct);
+
+// Read data from EEPROM and return it as a config_t struct
+config_t read_struct_from_EEPROM();
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* EEPROM_H */
+

prosjekt.X/fan-speed.c

@@ -0,0 +1,127 @@
+#include "fan-speed.h"
+#include "uart.h"
+
+uint16_t timer_period_ms = 1000;
+uint16_t fan_speed = 0;
+volatile uint16_t fan1_edge_counter = 0;
+volatile uint16_t fan2_edge_counter = 0;
+
+
+void init_TCA0() {
+    TCA0.SINGLE.INTCTRL = TCA_SINGLE_OVF_bm ;
+    TCA0.SINGLE.CTRLA = TCA_SINGLE_ENABLE_bm | TCA_SINGLE_CLKSEL_DIV1024_gc ; /* Sysclk /1024 */
+}
+
+void TCA0_update_period(uint16_t period_ms) {
+    float period_s = period_ms / 1E3; // Convert the ms to s
+    float frequency = 1/ period_s; // convert the period to a frequency
+    float perbuf_val = frequency * F_CPU / 1024; // F_IQR * F_CPU / TCA_prescaler
+    TCA0.SINGLE.PERBUF = (uint16_t)perbuf_val;
+    timer_period_ms = period_ms;
+}
+
+// COUNTINGS / TIME = FREQUENCY
+// FREQ / 2 = GIVES ACTUAL FREQ
+// FREQ * SEC-IN-A-MINUTE(60) / FAN-BLADES
+uint16_t RPM_calculation(uint16_t edge_counter, uint16_t time_ms) {
+    fan_speed = (edge_counter / (float)((float)time_ms/1000.0) );
+    fan_speed = fan_speed/2; 
+    fan_speed = fan_speed * 60/5;
+    edge_counter = 0;
+    return fan_speed;
+}
+
+
+void init_fan_gpio() {
+    // CONFIGURE PINS AS ANALOG INPUTS
+    
+    // PIN FOR FAN 1
+    PORTD.DIRSET &= ~PIN6_bm;
+    PORTD.PIN6CTRL &= ~ PORT_ISC_gm;
+    PORTD.PIN6CTRL = PORT_ISC_INPUT_DISABLE_gc;
+    
+    // PIN FOR FAN 2
+    PORTD.DIRSET &= ~PIN4_bm;
+    PORTD.PIN4CTRL &= ~ PORT_ISC_gm ;
+    PORTD.PIN4CTRL = PORT_ISC_INPUT_DISABLE_gc;
+    
+    // PIN FOR REFRENCE
+    PORTD.DIRSET &= PIN7_bm;
+    PORTD.PIN7CTRL &= ~ PORT_ISC_gm ;
+    PORTD.PIN7CTRL = PORT_ISC_INPUT_DISABLE_gc;
+}
+
+void init_AC0(){ 
+    //Wincontroll disabled
+    AC0.CTRLB = 0x00;
+    
+    //SELECT POSITIVE AND NEGATIVE INPUTS FOR COMPARRISON
+    // FAN USE PD6 COMPARE WITH PD3
+    AC0.MUXCTRL = AC_MUXPOS_AINP3_gc | AC_MUXNEG_AINN2_gc;
+    
+    // ENABLE AC BY WRITING 1 TO ENABLE BIT IN ACN.CTRLA
+    AC0.CTRLA = AC_ENABLE_bm | AC_INTMODE_NORMAL_POSEDGE_gc | AC_OUTEN_bm;
+    
+    // TURN ON INTERUPT
+    AC0.INTCTRL = 0x01; 
+}
+
+
+void init_AC1(){    
+    //Wincontroll disabled
+    AC1.CTRLB = 0x00;
+    
+    //SELECT POSITIVE AND NEGATIVE INPUTS FOR COMPARRISON
+    // FAN USE PD4, COMPARE WITH PD3
+    AC1.MUXCTRL = AC_MUXPOS_AINP2_gc | AC_MUXNEG_AINN2_gc;
+    
+    // ENABLE AC BY WRITING 1 TO ENABLE BIT IN ACN.CTRLA
+    AC1.CTRLA = AC_ENABLE_bm | AC_INTMODE_NORMAL_POSEDGE_gc | AC_OUTEN_bm;
+    
+    // TURN ON INTERUPT
+    AC1.INTCTRL = 0x01; 
+}
+
+
+ISR(AC0_AC_vect){ // AC0 vec flag 
+    cli();
+    fan1_edge_counter++;
+    AC0.STATUS |= 0x10; //CMP flag to 0
+    sei();
+}
+
+
+ISR(AC1_AC_vect){ // AC1 vec flag 
+    cli();
+    fan2_edge_counter++;
+    AC1.STATUS |= 0x10; //CMP flag to 0
+    sei();
+}
+
+// TIMER INTERUPT
+ISR (TCA0_OVF_vect) {
+    cli();
+    
+    // Increment the index, or reset if it is at the top
+    if (fan1_history_index < 512) {
+        fan1_history_index++;
+    } else {
+        fan1_history_index = 0;
+    }
+    
+    if (fan2_history_index < 512) {
+        fan2_history_index++;
+    } else {
+        fan2_history_index = 0;
+    }
+    
+    // Calculate the fanspeed
+    fan1_history[fan1_history_index] = RPM_calculation(fan1_edge_counter, timer_period_ms);
+    fan2_history[fan2_history_index] = RPM_calculation(fan2_edge_counter, timer_period_ms);
+        
+    // Reset the edge counter
+    fan1_edge_counter = 0;
+    fan2_edge_counter = 0;
+    TCA0.SINGLE.INTFLAGS = TCA_SINGLE_OVF_bm ;
+    sei();
+}

prosjekt.X/fan-speed.h

@@ -0,0 +1,64 @@
+/* 
+ * File:   fanseeeed.h
+ * Author: inami, Helle Augland Grasmo
+ *
+ * Created on 13. mars 2024, 13:38
+ */
+
+
+
+#ifndef FANSEEEED_H
+#define	FANSEEEED_H
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#include <stdbool.h>
+#include <float.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <math.h>
+#include <avr/interrupt.h>
+#include <avr/io.h>
+
+    /*
+     The code has inspiration from "Getting Started with Analog comparator(AC)" by Microchip for setting up analog comparrator. 
+     *          web link: https://ww1.microchip.com/downloads/aemDocuments/documents/MCU08/ApplicationNotes/ApplicationNotes/TB3211-Getting-Started-with-AC-DS90003211.pdf
+     * and inspiration form practice 6 for TCA0 setup
+     */
+
+
+    // Fan history variables
+    extern volatile uint16_t fan1_history[512];
+    extern volatile uint16_t fan2_history[512];
+    // Fan history index variable
+    extern volatile uint16_t fan1_history_index;
+    extern volatile uint16_t fan2_history_index;
+
+    // INITALICE TIMER COUNTER
+    void init_TCA0();
+
+    // UPDATE TIMER PERIOD
+    void TCA0_update_period_ms (uint16_t timer_period);
+
+    // TAKES INN A TIME AND A THE COUNTED FAN DIPS
+    // RETURNS THE RPM OF THE FAN
+    uint16_t RPM_calculation(uint16_t edge_counter, uint16_t time_ms);
+
+    // INITIALISING FAN PORTS
+    void init_fan_gpio();
+
+    // INIT AC0 TO COMPARE PD6 AND PD7
+    void init_AC0();
+
+    // INIT AC1 TO COMPARE PD4 AND PD7
+    void init_AC1();
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* FANSEEEED_H */
+

prosjekt.X/fan_speeeed.c

@@ -1,128 +0,0 @@
-#include "fan_speeeed.h"
-#include "uart.h"
-
-uint16_t timer_period_ms = 1;
-uint16_t fan_speed;
-volatile uint16_t falling_edge_counter = 0;
-
-void TCA0_init() {
-TCA0.SINGLE.INTCTRL = TCA_SINGLE_OVF_bm ;
-TCA0.SINGLE.CTRLA = TCA_SINGLE_ENABLE_bm | TCA_SINGLE_CLKSEL_DIV1024_gc ; /* Sysclk /1024 */
-TCA0_update_period_ms();
-}
-
-void TCA0_update_period_ms() {
-    TCA0.SINGLE.PERBUF = (F_CPU*(1/timer_period_ms)/1024); /* F_CPU * F_IRQ / TCA_prescaler */
-}
-
-uint16_t RPM_calculation() {
-    fan_speed = (falling_edge_counter/timer_period_ms)*6000*3;
-    falling_edge_counter= 0;
-    printf("%u", fan_speed);
-    return fan_speed;
-}
-
-void PORT_init(){
-    //compare or capture
-    //TCB3.CCMP = 0x00;
-    //count
-    TCB3.CNT = 0x00;
-    
-    PORTA.IN = PIN0_bm;
-    PORTA.PIN0CTRL =   PORT_PULLUPEN_bm;
-    
-    //PORTD.PIN2CTRL = PORT_ISC_FALLING_gc | 0b01000000;
-//	TCB3.CTRLB =0<< TCB_ASYNC_bp       /* Asynchronous Enable: disabled */|0<< TCB_CCMPEN_bp    /* Pin Output Enable: disabled */|0<< TCB_CCMPINIT_bp  /* Pin Initial State: disabled */| TCB_CNTMODE_FRQ_gc;/* Input Capture Frequency measurement */
-//	TCB3.EVCTRL =1<< TCB_CAPTEI_bp    /* Event Input Enable: enabled */|0<< TCB_EDGE_bp    /* Event Edge: disabled */|0<< TCB_FILTER_bp;/* Input Capture Noise Cancellation Filter: disabled */
-//	TCB3.INTCTRL =1<< TCB_CAPT_bp     /* Capture or Timeout: enabled */|0<< TCB_OVF_bp;/* OverFlow Interrupt: disabled */
-//	TCB3.CTRLA = TCB_CLKSEL_DIV1_gc     /* CLK_PER */|1<< TCB_ENABLE_bp   /* Enable: enabled */|0<< TCB_RUNSTDBY_bp /* Run Standby: disabled */|0<< TCB_SYNCUPD_bp  /* Synchronize Update: disabled */|0<< TCB_CASCADE_bp;/* Cascade Two Timer/Counters: disabled */
-    
-    //ASYNC disabled; CCMPINIT disabled; CCMPEN disabled; CNTMODE FRQPW; 
-    TCB3.CTRLB = 0x04;
-
-    //DBGRUN disabled; 
-    //TCB3.DBGCTRL = 0x00;
-
-    //FILTER disabled; EDGE disabled; CAPTEI enabled; 
-    TCB3.EVCTRL = 0x01;
-
-    //OVF disabled; CAPT enabled; 
-    TCB3.INTCTRL = 0x01;
-
-    //OVF disabledAPT disabled; 
-    //TCB3.INTFLAGS = 0; CAPT disabled; 
-    //TCB3.INTFLAGS = 0x00;
-
-    //Temporary Value
-    //TCB3.TEMP = 0x00;
-
-    
-    EVSYS.CHANNEL0 = 0x40;
-    //EVSYS.SWEVENTA = 0x01;
-    EVSYS.USERTCB3CAPT = 0x01;
-    
-    //RUNSTDBY disabled; CASCADE disabled; SYNCUPD disabled; CLKSEL DIV1; ENABLE enabled; 
-    TCB3.CTRLA = 0x01;
-}
-
-void TCB0_Init(void){
-    TCB3.CTRLB = TCB_CNTMODE_FRQPW_gc;    /* Input Capture Frequency */
-    TCB3.EVCTRL = TCB_CAPTEI_bm;        /* Event Input Enable: enabled */ 
-    TCB3.EVCTRL |= (1 << TCB_CAPTEI_bp | 1 << TCB_EDGE_bp | 1 << TCB_FILTER_bp);  /* Event Input Enable: enabled */ 
-    TCB3.INTCTRL = TCB_CAPT_bm;         /* Capture or Timeout: enabled */
-    TCB3.CTRLA = TCB_CLKSEL_DIV1_gc     /* CLK_PER/1 (From Prescaler) - This is needed to be able to count to 40 Hz with a 4 Mhz system clock */                                             
-          | TCB_ENABLE_bm    /* Enable: enabled */
-          | TCB_RUNSTDBY_bm;  /* Run Standby: enabled */
-} 
-void EVSYS_Init(void)
-{
-    /* Zero-cross detector 0 out linked to event channel 0 */
-    EVSYS.CHANNEL0 = EVSYS_CHANNEL0_PORTA_PIN5_gc;
-    /* TCB uses event channel 0 */
-    EVSYS.USERTCB0CAPT = EVSYS_USER_CHANNEL0_gc;
-}
- 
-void PORT_Init(void)
-{
-    PORTB.OUTSET |= PIN5_bm;
-    PORTB.DIRSET |= PIN5_bm;  
-}
-//-----------------------------------------------------------------------------------------------------
-//-------------------------------------- S E T U P-----------------------------------------------------
-
-/*
-ISR ( TCA0_OVF_vect ) {
-    cli();
-    RPM_calculation();
-    
-    TCA0.SINGLE.INTFLAGS = TCA_SINGLE_OVF_bm ;
-    
-    sei();
-}*/
-
-void printnie(uint8_t en, uint8_t to){
-    printf("CNT %u", en);
-    printf("ccmp %u", to);
-}
-
-ISR (TCB3_INT_vect){
-    uint16_t yo = TCB3.CNT;
-   
-    uint16_t stewui = TCB3.CCMP; 
-    
-    printnie(yo, stewui);
-    TCB3.INTFLAGS = 0x03;
-    //TCB3.INTFLAGS = PIN0_bm;
-    
-}
-
-
-/*
-ISR(PORTD_PORT_vect){
-   // cli();
-    falling_edge_counter ++;
-    
-    PORTD.INTFLAGS = PIN2_bm;
-    //sei();
-}
- * */

prosjekt.X/fan_speeeed.h

@@ -1,37 +0,0 @@
-/* 
- * File:   fanseeeed.h
- * Author: inami
- *
- * Created on 13. mars 2024, 13:38
- */
-
-
-
-#ifndef FANSEEEED_H
-#define	FANSEEEED_H
-
-#ifdef	__cplusplus
-extern "C" {
-#endif
-
-#include <stdbool.h>
-#include <float.h>    
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <math.h>
-#include <avr/interrupt.h>
-#include <avr/io.h>
-#include <avr/cpufunc.h>
-    
-    void TCA0_init ();
-    void PORT_init();
-    
-    void TCA0_update_period_ms ();
-    uint16_t RPM_calculation();
-#ifdef	__cplusplus
-}
-#endif
-
-#endif	/* FANSEEEED_H */
-

prosjekt.X/i2c.c

@@ -0,0 +1,125 @@
+#include "i2c.h"
+#include "command-handler.h"
+
+// Basic I2C handling structure is heavily inspired by:
+// https://github.com/microchip-pic-avr-examples/avr128db48-bare-metal-twi-mplab/blob/master/twi-client.X/peripherals/TWI/TWI_client.c
+
+// We need to keep track of if the stop confition is in regards to a write or
+// read request
+volatile bool last_action_write = false;
+
+// Buffer to hold the received data
+volatile uint8_t i2c_recv_buf[I2C_RECV_BUF_SIZE] = {0};
+// Counter to know which datapoint we're on
+volatile uint8_t i2c_recv_len = 0;
+
+void init_i2c(void) {
+  // Pin setup
+  PORTA.DIRSET = PIN2_bm | PIN3_bm;
+  PORTA.PINCTRLUPD = PIN2_bm | PIN3_bm;
+
+  // Enable operating in debug
+  TWI0.DBGCTRL = TWI_DBGRUN_bm;
+
+  // Initialize the control A register
+  TWI0.CTRLA = TWI_INPUTLVL_I2C_gc    // I2C voltage transition level
+               | TWI_SDASETUP_4CYC_gc // Four clock cycles setup time
+               | TWI_SDAHOLD_50NS_gc  // 50ns SDA hold time
+               | TWI_FMPEN_OFF_gc     // Standard SPI timing
+      ;
+
+  // The device's slave address
+  TWI0.SADDR = 0x42;
+
+  // Enable acting as a slave
+  TWI0.SCTRLA = TWI_DIEN_bm     // Enable data interrupt
+                | TWI_APIEN_bm  // Enable more interrupts
+                | TWI_PIEN_bm   // Enable stop flag interrupt
+                | PIN2_bm       // Respond to all TWI addresses
+                | TWI_ENABLE_bm // Enable acting as a slave
+      ;
+
+  // Reset the received stuff
+  i2c_reset_recv();
+}
+
+// Reset received counter and clear receive buffer
+void i2c_reset_recv() {
+  i2c_recv_len = 0;
+  for (int i = 0; i < I2C_RECV_BUF_SIZE; i++) {
+    i2c_recv_buf[i] = 0;
+  }
+}
+
+void i2c_write_handler(uint8_t data) {
+  last_action_write = true;
+  
+  // Validate that we are not overflowing the buffer
+  if (i2c_recv_len >= I2C_RECV_BUF_SIZE) { return; }
+  
+  // Write the data to the receive buffer
+  i2c_recv_buf[i2c_recv_len] = data;
+  i2c_recv_len++;
+}
+
+void i2c_read_handler() {
+  last_action_write = false;
+  TWI0.SDATA = route_command(i2c_recv_len);
+  i2c_recv_len++; // Increment the counter of the current amount of requests
+}
+
+void i2c_stop_handler() {
+  if (last_action_write) {
+    // Parse the received command data
+    parse_command(i2c_recv_buf, i2c_recv_len);
+    
+    // If the received command is a write only command we want to route it now.
+    if (i2c_recv_buf[0] == CLEAR_BULK_FAN_SPEED || i2c_recv_buf[0] == WRITE_CONFIG) {
+        route_command(0);
+    }
+  }
+  
+  // Reset the buffer for future transmissions
+  i2c_reset_recv();
+}
+
+// Address received
+ISR(TWI0_TWIS_vect) {
+  // Disable interrupts while handling I2C
+  cli();
+
+  // Check for the data interrupt flag
+  if (TWI0.SSTATUS & TWI_DIF_bm) {
+
+    if (((TWI0.SSTATUS & TWI_DIR_bm) >> TWI_DIR_bp) == 0) {
+      // Data write Controller -> Target
+      uint8_t data = TWI0.SDATA;
+
+      // Send the data to the write handler
+      i2c_write_handler(data);
+    } else {
+      // Data read Controller <- Target
+      i2c_read_handler();
+    }
+
+    // Acknowledge having received
+    TWI0.SCTRLB = TWI_ACKACT_ACK_gc | TWI_SCMD_RESPONSE_gc;
+  }
+
+  // Check for address match or STOP
+  if (TWI0.SSTATUS & TWI_APIF_bm) {
+
+    if (TWI0.SSTATUS & TWI_AP_ADR_gc) {
+      // Address match, just send ack
+      TWI0.SCTRLB = TWI_ACKACT_ACK_gc | TWI_SCMD_RESPONSE_gc;
+    } else {
+      // STOP condition received
+      i2c_stop_handler();
+      // Send ACK
+      TWI0.SCTRLB = TWI_ACKACT_ACK_gc | TWI_SCMD_RESPONSE_gc;
+    }
+  }
+
+  // Re-enable interrupts
+  sei();
+}

prosjekt.X/i2c.h

@@ -0,0 +1,36 @@
+/*
+ * File:   i2c.h
+ * Author: sebgab
+ *
+ * Created on March 6, 2024, 1:53 PM
+ */
+
+#ifndef I2C_H
+#define I2C_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Include the IO for I2C
+#include "command-handler.h"
+#include <avr/interrupt.h>
+#include <avr/io.h>
+#include <stdbool.h>
+#include <util/twi.h>
+
+// Received data buffer size
+// The size is larger than any expected command length
+#define I2C_RECV_BUF_SIZE 16
+
+// Reset recv to initial state
+void i2c_reset_recv();
+
+// Initialize the I2C bus
+void init_i2c(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* I2C_H */

prosjekt.X/main.c

@@ -1,65 +1,83 @@
-/* 
+/*
- * File:   main.c
+ * File:   main.c
- * Author: Sebastian H. Gabrielli
+ * Author: Sebastian H. Gabrielli, Helle Augland Grasmo, Ina Min Rørnes
- *
+ *
- * Created on March 6, 2024, 12:34 PM
+ * Created on March 6, 2024, 12:34 PM
- */
+ */
-#include "voltage.h"
+#define F_CPU 4E6
-#include "uart.h"
+
-#define RTC_PERIOD (511)
+// Include AVR specific libs
-#define DELAY_TIME 1000
+#include <avr/interrupt.h>
-#include <avr/io.h>
+#include <avr/io.h>
-#include <avr/interrupt.h>
+#include <util/delay.h>
-#include <util/delay.h>
+
-#include <string.h>
+// Include standard C libraries
-#include <stdbool.h>
+#include <stdbool.h>
-
+#include <stdio.h>
-
+#include <stdlib.h>
-//#define F_CPU 4E6
+#include <string.h>
-
+#include <stdint.h>
-#include <stdio.h>
+
-#include <stdlib.h>
+// Include custom source files
-#include "uart.h"
+#include "eeprom.h"
-#include <util/delay.h>
+#include "voltage.h"
-#include <stdint.h>
+#include "command-handler.h"
-#include "themistor-temp.h"
+#include "i2c.h"
-#include "fan_speeeed.h"
+#include "themistor-temp.h"
-
+#include "fan-speed.h"
-
+
-int main() {
+// Only enable UART when required for debugging
-    init_uart((uint16_t)9600);
+#ifdef ENABLE_UART
-    stdout = &USART_stream;
+#include "uart.h"
-    TCA0_init ();
+#endif
-    //PORT_init();  
+
-    //test
+// Fan history variables
-    
+volatile uint16_t fan1_history[512] = {0};
-    TCB0_Init();
+volatile uint16_t fan2_history[512] = {0};
-  EVSYS_Init();
+// Fan history index variable
-  PORT_Init();
+volatile uint16_t fan1_history_index = 0;
-  TCB3.INTCTRL = 0b00000001;     // Bit 0 ? CAPT Capture Interrupt Enable
+volatile uint16_t fan2_history_index = 0;
-  
+
-     sei();
+// Default config is 500ms sample rate
-     
+volatile config_t config = {500};
-    while (1) {
+volatile bool store_config = false;
-        /*
+
-        printf("loop");
+int main() {
-        uint16_t yo = TCB3.CNT;
+  // Initialize functionality
-        printf("CNT %u", yo);
+  ADC0_init();
-        uint16_t stewui = TCB3.CCMP; 
+  init_alarm_gpio();
-        printf("CCMP %u", stewui);
+  init_i2c();
-        */
+  
-        ;
+  // Fanspeed
-    }
+  init_AC0();
-}
+  init_AC1();
-
+  init_TCA0();
-/*ISR (TCB3_INT_vect){
+  TCA0_update_period(config.ms_fanspeed_sample_rate);
-    uint16_t yo = TCB3.CNT;
+  
-    printf("CNT %u", yo);
+  // Only enable UART when required for debugging
-    
+#ifdef ENABLE_UART
-    uint16_t stewui = TCB3.CCMP; 
+  init_uart((uint16_t)9600);
-    printf("CCMP %u", stewui);
+  stdout = &USART_stream;
-    
+#endif
-    TCB3.INTFLAGS = 0x03;
+
-    //TCB3.INTFLAGS = PIN0_bm;
+  // Read the stored config struct
-    
+  config = read_struct_from_EEPROM();
-}*/
+
+  // Enable interrupts
+  sei();
+
+  while (1) {
+    // If we have made a config change, store it and recalculate the period.
+    if (store_config) {
+      TCA0_update_period(config.ms_fanspeed_sample_rate);
+      write_struct_from_EEPROM(config);
+      store_config = false;
+    }
+  }
+  
+  // Check the temperature, and start the alarm if required
+  uint16_t thermistor_voltage = thermistor_voltage_read();
+  float temperature = calculate_thermistor_temp(thermistor_voltage);
+  bool start_alarm = voltage_threshold_bool(temperature, 40);
+  alert_voltage_threshold_exceeded(start_alarm);
+}

prosjekt.X/nbproject/configurations.xml

@@ -6,8 +6,11 @@
                    projectFiles="true">
       <itemPath>uart.h</itemPath>
       <itemPath>voltage.h</itemPath>
-      <itemPath>fan_speeeed.h</itemPath>
       <itemPath>themistor-temp.h</itemPath>
+      <itemPath>command-handler.h</itemPath>
+      <itemPath>eeprom.h</itemPath>
+      <itemPath>i2c.h</itemPath>
+      <itemPath>fan-speed.h</itemPath>
     </logicalFolder>
     <logicalFolder name="ExternalFiles"
                    displayName="Important Files"
@@ -25,8 +28,11 @@
       <itemPath>main.c</itemPath>
       <itemPath>uart.c</itemPath>
       <itemPath>voltage.c</itemPath>
-      <itemPath>fan_speeeed.c</itemPath>
       <itemPath>thermistor-temp.c</itemPath>
+      <itemPath>command-handler.c</itemPath>
+      <itemPath>i2c.c</itemPath>
+      <itemPath>eeprom.c</itemPath>
+      <itemPath>fan-speed.c</itemPath>
     </logicalFolder>
   </logicalFolder>
   <projectmakefile>Makefile</projectmakefile>

prosjekt.X/themistor-temp.h

@@ -13,24 +13,34 @@ extern "C" {
 #endif
 
 #include <stdbool.h>
-#include <float.h>    
+#include <float.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
 #include <math.h>
-#define R_t0 10000
+#include <avr/io.h>
+#define R_T0 100E3
 #define T_0 298.15
 #define B 3950
 #define R_1 1000
-    
+#define ledpin PIN3_bm
-// Takes inn messured value 
+
+// Takes inn messured value
+#define ALERT_PIN PIN3_bm
+
+// Takes inn messured value
 // Calculates the temperature in celcius
-// Returns the thermistor themperature 
+// Returns the thermistor themperature
 float calculate_thermistor_temp(float readValue);
-// Returns true if temperatur is higher then high_temp int    
-bool error_message(float thermistor_temp);
 
 
+// Returns true if temperatur is higher than max_temp
+bool voltage_threshold_bool(float thermistor_temp, uint8_t max_temp);
+
+void alert_voltage_threshold_exceeded(bool voltage_threshold_bool);
+
+// Initialise alarm GPIO
+void init_alarm_gpio();
 
 #ifdef	__cplusplus
 }

prosjekt.X/thermistor-temp.c

@@ -1,41 +1,52 @@
 #include "themistor-temp.h"
 
-float calculate_thermistor_temp(float readValue){
+
-    float R_therm;
+void init_alarm_gpio(){
-    float V_1;
+    PORTB.DIRSET = ALERT_PIN;    
-    float ln; 
-    float T_therm;
-    float V_therm;
-    uint8_t V_tot = 5;
-    // Calculate Voltage over thermistor
-    V_therm = (V_tot/1024)*readValue;
-    
-    // Voltage accross R_1
-    V_1 = V_tot - V_therm; 
-    
-    // Calculate Thermistor resistanse
-    R_therm = (V_therm)/ (V_1 / R_1);
-    
-    // Steinhart-Harts formula
-    ln = log(R_therm/R_t0);
-    T_therm = (1/ ((ln/B) + (1/T_0)));
-    
-    // Temperatur in celcius
-    T_therm -= 273.15;
-    
-    return T_therm;
 }
 
-// returns error message
+// The code is inspired by "Arduino thermistor guide" by valtentina Vogelman, 1 november 2023
-bool error_message(float thermistor_temp){
+// https://www.build-electronic-circuits.com/arduino-thermistor/
-    // Max value
+
-    int high_temp = 0;
+float calculate_thermistor_temp(float thermistor_voltage){
+    float R_thermistor;
+    float V_1;
+    float ln; 
+    float T_thermistor;
+    float V_thermistor;
+    #define V_TOT 3.3
+    // Calculate Voltage over thermistor
+    V_thermistor = (V_TOT/1024)*thermistor_voltage;
+    
+    // Voltage accross R_1
+    V_1 = V_TOT - V_thermistor; 
+    
+    // Calculate Thermistor resistanse
+    R_thermistor = (V_thermistor)/ (V_1 / R_1);
+    
+    // Steinhart-Harts formula
+    ln = log(R_thermistor/R_T0);
+    T_thermistor = (1/ ((ln/B) + (1/T_0)));
+    
+    // Temperatur in celcius
+    T_thermistor -= 273.15;
+    
+    return T_thermistor;
+}
+
+// returns error message if the messured thermistor temp is higher than
+// Choosen max_temp
+bool voltage_threshold_bool(float thermistor_temp, uint8_t max_temp){
     // Return true if temp is higher then max value
-    if (thermistor_temp > high_temp){
+    return (thermistor_temp >= max_temp);
-        printf("Error");
+}
-        return true;
+
+//print if the maximum threshold is exceeded. 
+void alert_voltage_threshold_exceeded(bool voltage_threshold_bool){
+    if (voltage_threshold_bool){
+        //printf("Error: maximum temperature exceeded");
+        PORTB.OUTSET = ALERT_PIN; 
+    }  else{
+        PORTB.OUTCLR = ALERT_PIN; 
     }
-    else {
+}
-        return false;
-    }
-}

prosjekt.X/thermistor-temp.c.save

@@ -0,0 +1,52 @@
+#include "themistor-temp.h"
+
+
+void init_led(){
+    PORTB.DIRSET = ledpin;    
+}
+
+
+https://www.build-electronic-circuits.com/arduino-thermistor/
+
+float calculate_thermistor_temp(float thermistor_voltage){
+    float R_thermistor;
+    float V_1;
+    float ln; 
+    float T_thermistor;
+    float V_thermistor;
+    #define V_TOT 5
+    // Calculate Voltage over thermistor
+    V_thermistor = (V_TOT/1024)*thermistor_voltage;
+    
+    // Voltage accross R_1
+    V_1 = V_TOT - V_thermistor; 
+    
+    // Calculate Thermistor resistanse
+    R_thermistor = (V_thermistor)/ (V_1 / R_1);
+    
+    // Steinhart-Harts formula
+    ln = log(R_thermistor/R_T0);
+    T_thermistor = (1/ ((ln/B) + (1/T_0)));
+    
+    // Temperatur in celcius
+    T_thermistor -= 273.15;
+    
+    return T_thermistor;
+}
+
+// returns error message if the messured thermistor temp is higher than
+// Choosen max_temp
+bool voltage_threshold_bool(float thermistor_temp, uint8_t max_temp){
+    // Return true if temp is higher then max value
+    return (thermistor_temp >= max_temp);
+}
+
+//print if the maximum threshold is exceeded. 
+void alert_voltage_threshold_exceeded(bool voltage_threshold_bool){
+    if (voltage_threshold_bool){
+        printf("Error: maximum temperature exceeded");
+        PORTB.OUTSET = ledpin; 
+    }  else{
+        PORTB.OUTCLR = ledpin; 
+    }
+}

prosjekt.X/uart.h

@@ -20,7 +20,7 @@ extern "C" {
 #endif
     
 #define USART3_BAUD_RATE(BAUD_RATE) ((float)(F_CPU * 64 / (16 * (float)BAUD_RATE)) + 0.5)
-
+   
 // Initialize the USART3 controller
 void init_uart(uint16_t baud);
 

prosjekt.X/voltage.c

@@ -2,40 +2,58 @@
 #include "uart.h"
 
 void ADC0_init(void) {
-    /* Initializing ADC0 pin*/
+  /* Initializing ADC0 pin*/
-    PORTD.PIN6CTRL &= ~PORT_ISC_gm;
+  /*Voltage reading on pin pd2*/
-    PORTD.PIN6CTRL |= PORT_ISC_INPUT_DISABLE_gc; /* Disable  */
+  PORTD.PIN2CTRL &= ~PORT_ISC_gm;
-    PORTD.PIN6CTRL &= PORT_PULLUPEN_bm;
+  PORTD.PIN2CTRL |= PORT_ISC_INPUT_DISABLE_gc; /* Disable  */
+  PORTD.PIN2CTRL &= PORT_PULLUPEN_bm;
 
-    ADC0.CTRLC = ADC_PRESC_DIV4_gc;
+  /* Thermistor */
-    VREF.ADC0REF = VREF_REFSEL_VDD_gc; /* Internal reference */
+  PORTD.PIN3CTRL &= ~PORT_ISC_gm;
-    ADC0.CTRLA = ADC_ENABLE_bm /* ADC Enable: enabled */
+  PORTD.PIN3CTRL |= PORT_ISC_INPUT_DISABLE_gc; /* Disable  */
-            | ADC_RESSEL_10BIT_gc; /* 10-bit mode */
+  PORTD.PIN3CTRL &= PORT_PULLUPEN_bm;
-    /* Select ADC channel */
+
-    ADC0.MUXPOS = ADC_MUXPOS_AIN6_gc;
+  ADC0.CTRLC = ADC_PRESC_DIV4_gc;
+  VREF.ADC0REF = VREF_REFSEL_VDD_gc;  /* Internal reference */
+  ADC0.CTRLA = ADC_ENABLE_bm          /* ADC Enable: enabled */
+               | ADC_RESSEL_10BIT_gc; /* 10-bit mode */
+
+  /* Select ADC channel */
+  ADC0.MUXPOS = ADC_MUXPOS_AIN6_gc;
 }
 
 uint16_t ADC0_read(void) {
-    /* Start ADC conversion */
+  /* Start ADC conversion */
-    ADC0.COMMAND = ADC_STCONV_bm;
+  ADC0.COMMAND = ADC_STCONV_bm;
-    /* Wait until ADC conversion done */
+  /* Wait until ADC conversion done */
-    while (!(ADC0.INTFLAGS & ADC_RESRDY_bm)) {
+  while (!(ADC0.INTFLAGS & ADC_RESRDY_bm)) {
-        ;
+    ;
-    }
+  }
-    // Clear the interrupt flag by writing 1:
+  // Clear the interrupt flag by writing 1:
-    ADC0.INTFLAGS = ADC_RESRDY_bm;
+  ADC0.INTFLAGS = ADC_RESRDY_bm;
-    return ADC0.RES;
+  return ADC0.RES;
 }
 
-uint16_t diode_voltage_read() {
+uint16_t thermistor_voltage_read() {
-    /* Gets value for the diode */
+  /* Gets value for the diode */
-    uint8_t adcVal = ADC0_read();
+  ADC0.MUXPOS = 0x03; // Read PD3
+  uint16_t adc_val = ADC0_read();
 
-    return adcVal;
+  return adc_val;
+}
+// Gets the value over thermistor
+uint16_t external_voltage_read() {
+  ADC0.MUXPOS = 0x02; // Read PD6
+  uint16_t adc_val = ADC0_read();
+
+  return adc_val;
 }
 
 uint16_t internal_voltage_read() {
-    /* Gets value for the internal voltage reffreance*/
+  /* Gets value for the internal voltage reffreance*/
 
-    VREF.ADC0REF = VREF_REFSEL_VDD_gc;
+  ADC0.MUXPOS = 0x44;
+  uint8_t adc_val = ADC0_read();
+
+  return adc_val * 10;
 }

prosjekt.X/voltage.h

@@ -20,9 +20,9 @@
  */
 
 /* 
- * File:   
+ * File: Voltage.h 
- * Author: 
+ * Author: Sebastian Hernø Gabrielli, Helle Augland Grasmo, Ina Min Rørnes 
- * Comments:
+ * Comments: 
  * Revision history: 
  */
 
@@ -54,7 +54,13 @@ extern "C" {
     uint16_t ADC0_read(void);
     // Gets the value from sensor and internal voltage
     uint16_t internal_voltage_read();
-    uint16_t diode_voltage_read();
+    // Gets the value over thermistor
+    uint16_t thermistor_voltage_read();
+    // Gets internal voltage
+    uint16_t external_voltage_read();
+    // Converts value to voltage
+    uint16_t convert_to_voltage(uint16_t adc_val);
+    
 #ifdef	__cplusplus
 }
 #endif /* __cplusplus */