Get PWM working

.gitignore

@@ -0,0 +1,8 @@
+obj
+*.bin
+*.eep
+*.elf
+*.hex
+*.lss
+*.map
+*.sym

Descriptors.h

@@ -107,4 +107,3 @@
                                             ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(3);
 
 #endif
-

Makefile

@@ -18,7 +18,7 @@ F_CPU        = 16000000
 F_USB        = $(F_CPU)
 OPTIMIZATION = s
 TARGET       = usbfanctrl
-SRC          = main.c Descriptors.c $(LUFA_SRC_USB) $(LUFA_SRC_USBCLASS) $(LUFA_SRC_PLATFORM)
+SRC          = $(wildcard *.c) $(LUFA_SRC_USB) $(LUFA_SRC_USBCLASS) $(LUFA_SRC_PLATFORM)
 LUFA_PATH    = LUFA/LUFA
 CC_FLAGS     = -DUSE_LUFA_CONFIG_HEADER -IConfig
 LD_FLAGS     =

event.c

@@ -0,0 +1,66 @@
+/***************************************************************************
+ *   Copyright (C) 01/2019 by Olaf Rempel                                  *
+ *   razzor@kopf-tisch.de                                                  *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; version 2 of the License,               *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+#include <avr/interrupt.h>
+#include <avr/io.h>
+
+#include "event.h"
+
+/* *********************************************************************** */
+
+static event_entry_t events[EVENT_COUNT];
+static volatile uint8_t event_in_idx;
+static volatile uint8_t event_out_idx;
+
+/* *********************************************************************** */
+
+void event_queue(uint8_t type, uint8_t num, uint16_t value)
+{
+    event_entry_t * p_event;
+    uint8_t sreg_save;
+    uint8_t idx;
+
+    sreg_save = SREG;
+    cli();
+
+    idx     = event_in_idx;
+    p_event = &events[idx++];
+    if (p_event->type == EVENT_TYPE_EMPTY)
+    {
+        p_event->type   = type;
+        p_event->num    = num;
+        p_event->value  = value;
+        event_in_idx    = idx % EVENT_COUNT;
+    }
+
+    SREG = sreg_save;
+} /* event_queue */
+
+
+event_entry_t * event_get(void)
+{
+    return &events[event_out_idx];
+} /* event_get */
+
+
+void event_clear(void)
+{
+    uint8_t idx         = event_out_idx;
+    events[idx++].type  = EVENT_TYPE_EMPTY;
+    event_out_idx       = idx % EVENT_COUNT;
+} /* event_clear */

event.h

@@ -0,0 +1,27 @@
+#ifndef __EVENT_H__
+#define __EVENT_H__
+
+#include <stdint.h>
+
+/* *********************************************************************** */
+
+#define EVENT_COUNT               16
+
+#define EVENT_TYPE_EMPTY          0x00
+
+typedef struct event_entry_s
+{
+    uint8_t     type;
+    uint8_t     num;
+    uint16_t    value;
+} event_entry_t;
+
+/* *********************************************************************** */
+
+void            event_queue       (uint8_t type, uint8_t num, uint16_t value);
+event_entry_t * event_get         (void);
+void            event_clear       (void);
+
+/* *********************************************************************** */
+
+#endif /* __EVENT_H__ */

main.c

@@ -5,6 +5,9 @@
 #include <string.h>
 
 #include "Descriptors.h"
+#include "event.h"
+#include "pwm.h"
+#include "timer.h"
 
 #include <LUFA/Drivers/USB/USB.h>
 #include <LUFA/Platform/Platform.h>
@@ -39,12 +42,52 @@ int main(void)
 {
     SetupHardware();
 
+    timer_init();
+    pwm_init();
+
     GlobalInterruptEnable();
 
+    event_queue(EVENT_TYPE_PWM_COMMAND, 0, EVENT_VALUE_PWM_FADE_MAX);
+    event_queue(EVENT_TYPE_PWM_COMMAND, 1, EVENT_VALUE_PWM_FADE_MAX);
+    event_queue(EVENT_TYPE_PWM_COMMAND, 2, EVENT_VALUE_PWM_FADE_MAX);
+
     for (;;)
     {
-        CDC_Task();
+//        CDC_Task();
-        USB_USBTask();
+//        USB_USBTask();
+
+        timer_check(0);
+
+        event_entry_t* p_event = event_get();
+        if (p_event->type != EVENT_TYPE_EMPTY)
+        {
+            switch (p_event->type)
+            {
+                case EVENT_TYPE_PWM_COMMAND:
+                case EVENT_TYPE_PWM_VALUE:
+                    pwm_event_handler(p_event);
+                    break;
+
+                case EVENT_TYPE_PWM_STATUS:
+                    break;
+
+                case EVENT_TYPE_TIMER_SET:
+                    timer_event_handler(p_event);
+                    break;
+
+                case EVENT_TYPE_TIMER_ELAPSED:
+                    if (p_event->num == EVENT_NUM_TIMER_PWM)
+                    {
+                        pwm_event_handler(p_event);
+                    }
+                    break;
+
+                default:
+                    break;
+            }
+
+            event_clear();
+        }
     }
 }
 
@@ -58,7 +101,7 @@ void SetupHardware(void)
     /* Disable clock division */
     clock_prescale_set(clock_div_1);
 
-    USB_Init();
+//    USB_Init();
 }
 
 /** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and

pwm.c

@@ -0,0 +1,354 @@
+/***************************************************************************
+ *   Copyright (C) 01/2019 by Olaf Rempel                                  *
+ *   razzor@kopf-tisch.de                                                  *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; version 2 of the License,               *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+#include <avr/interrupt.h>
+#include <avr/pgmspace.h>
+
+#include "pwm.h"
+#include "timer.h"
+
+
+/* *********************************************************************** */
+
+#define PWM_TIM_16BIT       1
+
+#define PWM_TIM_INIT()      {   \
+                                /* enable output for OC1A, OC1B, OC3A */ \
+                                DDRB |= (1<<PORTB5) | (1<<PORTB6); \
+                                DDRC |= (1<<PORTC6); \
+                                /* reset and hold prescaler */ \
+                                GTCCR = (1<<TSM) | (1<<PSRSYNC); \
+                                /* FastModePWM, ICRn is TOP */ \
+                                TCCR1A = (1<<WGM11); \
+                                TCCR1B = (1<<WGM13) | (1<<WGM12); \
+                                ICR1 = 0xFFFF; \
+                                TCNT1 = 0x0000; \
+                                TCCR3A = (1<<WGM31); \
+                                TCCR3B = (1<<WGM33) | (1<<WGM32); \
+                                ICR3 = 0xFFFF; \
+                                TCNT3 = 0x8000; \
+                                /* release prescaler */ \
+                                GTCCR = (1<<PSRSYNC); \
+                            }
+
+#define PWM_TIM1_ENABLE()   { TCCR1B |= (1<<CS10); }
+#define PWM_TIM1_DISABLE()  { TCCR1B &= ~(1<<CS10); }
+#define PWM_TIM1_RUNNING()  (TCCR1B & ((1<<CS10) | (1<<CS11) | (1<<CS12)))
+#define PWM_TIM1_CHECK()    (TCCR1A & ((1<<COM1A1) | (1<<COM1B1)))
+
+#define PWM_TIM3_ENABLE()   { TCCR3B |= (1<<CS30); }
+#define PWM_TIM3_DISABLE()  { TCCR3B &= ~(1<<CS30); }
+#define PWM_TIM3_RUNNING()  (TCCR3B & ((1<<CS30) | (1<<CS31) | (1<<CS32)))
+#define PWM_TIM3_CHECK()    (TCCR3A & ((1<<COM3A1) | (1<<COM3B1)))
+
+#define PWM_TIMER_FADE_STEP_MS  10
+
+#define PWM_CH0_PORT        PORTB
+#define PWM_CH0_NUM         5
+#define PWM_CH0_OFF()       { PWM_CH0_PORT &= ~(1<<PWM_CH0_NUM); TCCR1A &= ~(1<<COM1A1); }
+#define PWM_CH0_ON()        { PWM_CH0_PORT |=  (1<<PWM_CH0_NUM); TCCR1A &= ~(1<<COM1A1); }
+#define PWM_CH0_PWM(x)      { PWM_CH0_PORT &= ~(1<<PWM_CH0_NUM); TCCR1A |=  (1<<COM1A1); OCR1A = x; }
+
+#define PWM_CH1_PORT        PORTB
+#define PWM_CH1_NUM         6
+#define PWM_CH1_OFF()       { PWM_CH1_PORT &= ~(1<<PWM_CH1_NUM); TCCR1A &= ~(1<<COM1B1); }
+#define PWM_CH1_ON()        { PWM_CH1_PORT |=  (1<<PWM_CH1_NUM); TCCR1A &= ~(1<<COM1B1); }
+#define PWM_CH1_PWM(x)      { PWM_CH1_PORT &= ~(1<<PWM_CH1_NUM); TCCR1A |=  (1<<COM1B1); OCR1B = x; }
+
+#define PWM_CH2_PORT        PORTC
+#define PWM_CH2_NUM         6
+#define PWM_CH2_OFF()       { PWM_CH2_PORT &= ~(1<<PWM_CH2_NUM); TCCR3A &= ~(1<<COM3A1); }
+#define PWM_CH2_ON()        { PWM_CH2_PORT |=  (1<<PWM_CH2_NUM); TCCR3A &= ~(1<<COM3A1); }
+#define PWM_CH2_PWM(x)      { PWM_CH2_PORT &= ~(1<<PWM_CH2_NUM); TCCR3A |=  (1<<COM3A1); OCR3A = x; }
+
+#if (PWM_TIM_16BIT)
+#define PWM_TABLE_SIZE      128
+#define PWM_TABLE_GET(x)    pgm_read_word(&pwmtable16[x])
+const uint16_t pwmtable16[PWM_TABLE_SIZE] PROGMEM =
+{
+    0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, 5, 5,
+    6, 6, 7, 8, 9, 9, 10, 11, 12, 14, 15, 16, 18, 20, 22, 24, 26,
+    28, 31, 34, 37, 40, 44, 48, 53, 58, 63, 69, 75, 82, 90, 98,
+    107, 116, 127, 139, 151, 165, 180, 196, 214, 234, 255, 278,
+    303, 331, 361, 394, 430, 469, 511, 557, 608, 663, 723, 789,
+    860, 938, 1023, 1116, 1217, 1327, 1447, 1578, 1721, 1877,
+    2047, 2232, 2434, 2655, 2895, 3157, 3443, 3755, 4095, 4466,
+    4870, 5311, 5792, 6316, 6888, 7511, 8191, 8932, 9741, 10623,
+    11584, 12633, 13776, 15023, 16383, 17866, 19483, 21246, 23169,
+    25267, 27553, 30047, 32767, 35733, 38967, 42494, 46340, 50534,
+    55108, 60096, 65535
+};
+#else
+#define PWM_TABLE_SIZE      32
+#define PWM_TABLE_GET(x)    pgm_read_byte(&pwmtable8[x])
+const uint8_t pwmtable8[PWM_TABLE_SIZE] PROGMEM =
+{
+    0, 0, 1, 1, 1, 2, 2, 3,
+    4, 5, 6, 7, 9, 10, 12, 15,
+    18, 22, 26, 31, 37, 44, 53, 63,
+    75, 90, 107, 127, 151, 180, 214, 255
+};
+#endif
+
+static uint8_t pwm_index[3];
+static uint8_t pwm_setpoint[3];
+static uint8_t pwm_setpoint_save[3];
+static uint8_t pwm_fade_timer_running;
+
+/* *********************************************************************** */
+
+static void pwm_update(uint8_t channel)
+{
+    uint8_t check_setpoint = 0;
+
+    if (pwm_setpoint[channel] >= PWM_TABLE_SIZE)
+    {
+        pwm_setpoint[channel] = (PWM_TABLE_SIZE - 1);
+    }
+
+    if ((pwm_setpoint[channel] > pwm_index[channel]) &&
+        (pwm_index[channel] < (PWM_TABLE_SIZE - 1))
+       )
+    {
+        pwm_index[channel]++;
+        check_setpoint = 1;
+    }
+    else if ((pwm_setpoint[channel] < pwm_index[channel]) &&
+             (pwm_index[channel] > 0)
+            )
+    {
+        pwm_index[channel]--;
+        check_setpoint = 1;
+    }
+
+    /* setpoint reached, notify others */
+    if (check_setpoint)
+    {
+        if (pwm_index[channel] == pwm_setpoint[channel])
+        {
+            event_queue(EVENT_TYPE_PWM_STATUS,
+                        channel,
+                        pwm_setpoint[channel]);
+        }
+        else if (!pwm_fade_timer_running)
+        {
+            event_queue(EVENT_TYPE_TIMER_SET,
+                        EVENT_NUM_TIMER_PWM,
+                        PWM_TIMER_FADE_STEP_MS);
+
+            pwm_fade_timer_running = 1;
+        }
+    }
+
+    /* if PWM is zero, disable output */
+    if (pwm_index[channel] == 0)
+    {
+        switch (channel)
+        {
+        case 0:
+            PWM_CH0_OFF();
+            break;
+
+        case 1:
+            PWM_CH1_OFF();
+            break;
+
+        case 2:
+            PWM_CH2_OFF();
+            break;
+
+        default:
+            break;
+        }
+    }
+    /* if PWM is max, enable output */
+    else if (pwm_index[channel] == (PWM_TABLE_SIZE - 1))
+    {
+        switch (channel)
+        {
+        case 0:
+            PWM_CH0_ON();
+            break;
+
+        case 1:
+            PWM_CH1_ON();
+            break;
+
+        case 2:
+            PWM_CH2_ON();
+            break;
+
+        default:
+            break;
+        }
+    }
+    /* else load new PWM into timer */
+    else
+    {
+        switch (channel)
+        {
+        case 0:
+            PWM_CH0_PWM(PWM_TABLE_GET(pwm_index[0]));
+            break;
+
+        case 1:
+            PWM_CH1_PWM(PWM_TABLE_GET(pwm_index[1]));
+            break;
+
+        case 2:
+            PWM_CH2_PWM(PWM_TABLE_GET(pwm_index[2]));
+            break;
+
+        default:
+            break;
+        }
+    }
+
+    switch (channel)
+    {
+    case 0:
+    case 1:
+        /* disable timer if all channels are ON or OFF */
+        if (PWM_TIM1_CHECK())
+        {
+            PWM_TIM1_ENABLE();
+        }
+        else
+        {
+            PWM_TIM1_DISABLE();
+        }
+        break;
+
+    case 2:
+        /* disable timer if all channels are ON or OFF */
+        if (PWM_TIM3_CHECK())
+        {
+            PWM_TIM3_ENABLE();
+        }
+        else
+        {
+            PWM_TIM3_DISABLE();
+        }
+        break;
+    }
+} /* pwm_update */
+
+
+void pwm_event_handler(event_entry_t * p_event)
+{
+    if (p_event->type == EVENT_TYPE_PWM_COMMAND)
+    {
+        uint8_t channel = p_event->num;
+
+        switch (p_event->value)
+        {
+        case EVENT_VALUE_PWM_KEEP:
+            pwm_setpoint[channel] = pwm_index[channel];
+            break;
+
+        /* increment PWM */
+        case EVENT_VALUE_PWM_INC:
+            if (pwm_setpoint[channel] < (PWM_TABLE_SIZE - 1))
+            {
+                pwm_setpoint[channel]++;
+            }
+            break;
+
+        /* decrement PWM */
+        case EVENT_VALUE_PWM_DEC:
+            if (pwm_setpoint[channel] > 0)
+            {
+                pwm_setpoint[channel]--;
+            }
+            break;
+
+        /* fade to min */
+        case EVENT_VALUE_PWM_FADE_MIN:
+            pwm_setpoint[channel] = 0;
+            break;
+
+        /* fade to max */
+        case EVENT_VALUE_PWM_FADE_MAX:
+            pwm_setpoint[channel] = (PWM_TABLE_SIZE - 1);
+            break;
+
+        /* toggle between 0 and stored value */
+        case EVENT_VALUE_PWM_TOGGLE:
+            if (pwm_setpoint[channel] > 5)
+            {
+                pwm_setpoint_save[channel] = pwm_setpoint[channel];
+                pwm_setpoint[channel] = 0;
+            }
+            else
+            {
+                pwm_setpoint[channel] = pwm_setpoint_save[channel];
+            }
+            break;
+
+        default:
+            break;
+        }
+
+        pwm_update(channel);
+    }
+    else if (p_event->type == EVENT_TYPE_PWM_VALUE)
+    {
+        uint8_t channel = p_event->num;
+
+        if (p_event->value < PWM_TABLE_SIZE)
+        {
+            pwm_setpoint[channel] = p_event->value;
+        }
+        else
+        {
+            pwm_setpoint[channel] = (PWM_TABLE_SIZE - 1);
+        }
+
+        pwm_update(channel);
+    }
+    else if ((p_event->type == EVENT_TYPE_TIMER_ELAPSED) &&
+             (p_event->num == EVENT_NUM_TIMER_PWM)
+            )
+    {
+        pwm_fade_timer_running = 0;
+
+        pwm_update(0);
+        pwm_update(1);
+        pwm_update(2);
+    }
+} /* pwm_event_handler */
+
+
+uint8_t pwm_get_sleep_mode(void)
+{
+    if (PWM_TIM1_RUNNING() || PWM_TIM3_RUNNING())
+    {
+        return SLEEP_MODE_IDLE;
+    }
+    else
+    {
+        return SLEEP_MODE_PWR_DOWN;
+    }
+} /* pwm_get_sleep_mode */
+
+
+void pwm_init(void)
+{
+    PWM_TIM_INIT();
+} /* pwm_init */

pwm.h

@@ -0,0 +1,32 @@
+#ifndef __PWM_H__
+#define __PWM_H__
+
+#include <stdint.h>
+#include "event.h"
+
+/* *********************************************************************** */
+
+#define EVENT_TYPE_PWM_COMMAND    0x04
+#define EVENT_TYPE_PWM_VALUE      0x05
+#define EVENT_TYPE_PWM_STATUS     0x06
+
+#define EVENT_NUM_PWM_CH0         0x00
+#define EVENT_NUM_PWM_CH1         0x01
+#define EVENT_NUM_PWM_CH2         0x02
+
+#define EVENT_VALUE_PWM_KEEP      0x00
+#define EVENT_VALUE_PWM_INC       0x01
+#define EVENT_VALUE_PWM_DEC       0x02
+#define EVENT_VALUE_PWM_FADE_MIN  0x03
+#define EVENT_VALUE_PWM_FADE_MAX  0x04
+#define EVENT_VALUE_PWM_TOGGLE    0x05
+
+/* *********************************************************************** */
+
+void    pwm_init                  (void);
+void    pwm_event_handler         (event_entry_t * p_event);
+uint8_t pwm_get_sleep_mode        (void);
+
+/* *********************************************************************** */
+
+#endif /* __PWM_H__ */

timer.c

@@ -0,0 +1,133 @@
+/***************************************************************************
+ *   Copyright (C) 01/2019 by Olaf Rempel                                  *
+ *   razzor@kopf-tisch.de                                                  *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; version 2 of the License,               *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+#include <avr/interrupt.h>
+#include <avr/io.h>
+#include <avr/sleep.h>
+
+#include "event.h"
+#include "timer.h"
+
+/* *********************************************************************** */
+
+#define TIMER_TIM_INIT()    {   \
+                                TCCR0A = 0x00; \
+                                TCCR0B = 0x00; \
+                                TIMSK0 = (1<<TOIE0); \
+                            }
+
+#define TIMER_TIM_ENABLE()  { TCCR0B |= ((1<<CS00) | (1<<CS01)); }
+#define TIMER_TIM_DISABLE() { TCCR0B &= ~((1<<CS00) | (1<<CS01)); }
+#define TIMER_TIM_RUNNING() (TCCR0B & ((1<<CS00) | (1<<CS01) | (1<<CS02)))
+#define TIMER_TIM_RELOAD(x) { TCNT0 = (0xFF - (x)); }
+#define TIMER_TIM_VECT      TIMER0_OVF_vect
+
+#define TIMER_DIVISOR       64
+#define TIMER_IRQFREQ_MS    1
+
+#define TIMER_MSEC2TICKS(x)     ((x * F_CPU) / (TIMER_DIVISOR * 1000ULL))
+#define TIMER_MSEC2IRQCNT(x)    (x / TIMER_IRQFREQ_MS)
+
+static uint16_t timers[TIMER_COUNT];
+volatile static uint8_t timer_ticked;
+
+/* *********************************************************************** */
+
+ISR(TIMER_TIM_VECT)
+{
+    /* 1ms interrupt */
+    TIMER_TIM_RELOAD(TIMER_MSEC2TICKS(TIMER_IRQFREQ_MS));
+
+    timer_ticked = 1;
+} /* TIM1_OVF_vect */
+
+
+uint8_t timer_check(uint8_t timer_needed)
+{
+    if (timer_ticked)
+    {
+        uint8_t i;
+
+        timer_ticked = 0;
+
+        for (i = 0; i < TIMER_COUNT; i++)
+        {
+            if (timers[i] > 0)
+            {
+                timers[i]--;
+                if (timers[i] == 0)
+                {
+                   event_queue(EVENT_TYPE_TIMER_ELAPSED, i, 0);
+                }
+                else
+                {
+                   timer_needed = 1;
+                }
+            }
+        }
+
+        /* stop timer */
+        if (timer_needed == 0)
+        {
+            TIMER_TIM_DISABLE();
+        }
+
+        return 1;
+    }
+
+    return 0;
+} /* timer_check */
+
+
+void timer_event_handler(event_entry_t * p_event)
+{
+    if ((p_event->type == EVENT_TYPE_TIMER_SET) &&
+        (p_event->num < TIMER_COUNT)
+      )
+    {
+        timers[p_event->num] = p_event->value;
+
+        /* start timer if needed */
+        if (!TIMER_TIM_RUNNING())
+        {
+            TIMER_TIM_RELOAD(TIMER_MSEC2TICKS(TIMER_IRQFREQ_MS));
+            TIMER_TIM_ENABLE();
+        }
+    }
+} /* timer_event_handler */
+
+
+uint8_t timer_get_sleep_mode(void)
+{
+    if (TIMER_TIM_RUNNING())
+    {
+       return SLEEP_MODE_IDLE;
+    }
+    else
+    {
+       return SLEEP_MODE_PWR_DOWN;
+    }
+  } /* timer_get_sleep_mode */
+
+
+void timer_init(void)
+{
+    TIMER_TIM_INIT();
+    TIMER_TIM_RELOAD(TIMER_MSEC2TICKS(TIMER_IRQFREQ_MS));
+    TIMER_TIM_ENABLE();
+} /* timer_init */

timer.h

@@ -0,0 +1,25 @@
+#ifndef __TIMER_H__
+#define __TIMER_H__
+
+#include <stdint.h>
+#include "event.h"
+
+/* *********************************************************************** */
+
+#define TIMER_COUNT                         1
+
+#define EVENT_TYPE_TIMER_SET                0x01
+#define EVENT_TYPE_TIMER_ELAPSED            0x02
+
+#define EVENT_NUM_TIMER_PWM                 0
+
+/* *********************************************************************** */
+
+void    timer_init                (void);
+uint8_t timer_check               (uint8_t timer_needed);
+void    timer_event_handler       (event_entry_t * p_event);
+uint8_t timer_get_sleep_mode      (void);
+
+/* *********************************************************************** */
+
+#endif /* __TIMER_H__ */