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Get PWM working

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This commit is contained in:
Olaf Rempel 2021-02-06 21:07:31 +01:00
parent 77aba4d21d
commit 3514b2576c
10 changed files with 749 additions and 62 deletions
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8
.gitignore vendored Normal file
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@ -0,0 +1,8 @@
obj
*.bin
*.eep
*.elf
*.hex
*.lss
*.map
*.sym

115
Descriptors.h
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@ -36,75 +36,74 @@
#ifndef _DESCRIPTORS_H_ #ifndef _DESCRIPTORS_H_
#define _DESCRIPTORS_H_ #define _DESCRIPTORS_H_
/* Includes: */ /* Includes: */
#include <LUFA/Drivers/USB/USB.h> #include <LUFA/Drivers/USB/USB.h>
#include <avr/pgmspace.h> #include <avr/pgmspace.h>
/* Macros: */ /* Macros: */
/** Endpoint address of the CDC device-to-host notification IN endpoint. */ /** Endpoint address of the CDC device-to-host notification IN endpoint. */
#define CDC_NOTIFICATION_EPADDR (ENDPOINT_DIR_IN | 2) #define CDC_NOTIFICATION_EPADDR (ENDPOINT_DIR_IN | 2)
/** Endpoint address of the CDC device-to-host data IN endpoint. */ /** Endpoint address of the CDC device-to-host data IN endpoint. */
#define CDC_TX_EPADDR (ENDPOINT_DIR_IN | 3) #define CDC_TX_EPADDR (ENDPOINT_DIR_IN | 3)
/** Endpoint address of the CDC host-to-device data OUT endpoint. */ /** Endpoint address of the CDC host-to-device data OUT endpoint. */
#define CDC_RX_EPADDR (ENDPOINT_DIR_OUT | 4) #define CDC_RX_EPADDR (ENDPOINT_DIR_OUT | 4)
/** Size in bytes of the CDC device-to-host notification IN endpoint. */ /** Size in bytes of the CDC device-to-host notification IN endpoint. */
#define CDC_NOTIFICATION_EPSIZE 8 #define CDC_NOTIFICATION_EPSIZE 8
/** Size in bytes of the CDC data IN and OUT endpoints. */ /** Size in bytes of the CDC data IN and OUT endpoints. */
#define CDC_TXRX_EPSIZE 16 #define CDC_TXRX_EPSIZE 16
/* Type Defines: */ /* Type Defines: */
/** Type define for the device configuration descriptor structure. This must be defined in the /** Type define for the device configuration descriptor structure. This must be defined in the
* application code, as the configuration descriptor contains several sub-descriptors which * application code, as the configuration descriptor contains several sub-descriptors which
* vary between devices, and which describe the device's usage to the host. * vary between devices, and which describe the device's usage to the host.
*/ */
typedef struct typedef struct
{ {
USB_Descriptor_Configuration_Header_t Config; USB_Descriptor_Configuration_Header_t Config;
// CDC Control Interface // CDC Control Interface
USB_Descriptor_Interface_t CDC_CCI_Interface; USB_Descriptor_Interface_t CDC_CCI_Interface;
USB_CDC_Descriptor_FunctionalHeader_t CDC_Functional_Header; USB_CDC_Descriptor_FunctionalHeader_t CDC_Functional_Header;
USB_CDC_Descriptor_FunctionalACM_t CDC_Functional_ACM; USB_CDC_Descriptor_FunctionalACM_t CDC_Functional_ACM;
USB_CDC_Descriptor_FunctionalUnion_t CDC_Functional_Union; USB_CDC_Descriptor_FunctionalUnion_t CDC_Functional_Union;
USB_Descriptor_Endpoint_t CDC_NotificationEndpoint; USB_Descriptor_Endpoint_t CDC_NotificationEndpoint;
// CDC Data Interface // CDC Data Interface
USB_Descriptor_Interface_t CDC_DCI_Interface; USB_Descriptor_Interface_t CDC_DCI_Interface;
USB_Descriptor_Endpoint_t CDC_DataOutEndpoint; USB_Descriptor_Endpoint_t CDC_DataOutEndpoint;
USB_Descriptor_Endpoint_t CDC_DataInEndpoint; USB_Descriptor_Endpoint_t CDC_DataInEndpoint;
} USB_Descriptor_Configuration_t; } USB_Descriptor_Configuration_t;
/** Enum for the device interface descriptor IDs within the device. Each interface descriptor /** Enum for the device interface descriptor IDs within the device. Each interface descriptor
* should have a unique ID index associated with it, which can be used to refer to the * should have a unique ID index associated with it, which can be used to refer to the
* interface from other descriptors. * interface from other descriptors.
*/ */
enum InterfaceDescriptors_t enum InterfaceDescriptors_t
{ {
INTERFACE_ID_CDC_CCI = 0, /**< CDC CCI interface descriptor ID */ INTERFACE_ID_CDC_CCI = 0, /**< CDC CCI interface descriptor ID */
INTERFACE_ID_CDC_DCI = 1, /**< CDC DCI interface descriptor ID */ INTERFACE_ID_CDC_DCI = 1, /**< CDC DCI interface descriptor ID */
}; };
/** Enum for the device string descriptor IDs within the device. Each string descriptor should /** Enum for the device string descriptor IDs within the device. Each string descriptor should
* have a unique ID index associated with it, which can be used to refer to the string from * have a unique ID index associated with it, which can be used to refer to the string from
* other descriptors. * other descriptors.
*/ */
enum StringDescriptors_t enum StringDescriptors_t
{ {
STRING_ID_Language = 0, /**< Supported Languages string descriptor ID (must be zero) */ STRING_ID_Language = 0, /**< Supported Languages string descriptor ID (must be zero) */
STRING_ID_Manufacturer = 1, /**< Manufacturer string ID */ STRING_ID_Manufacturer = 1, /**< Manufacturer string ID */
STRING_ID_Product = 2, /**< Product string ID */ STRING_ID_Product = 2, /**< Product string ID */
}; };
/* Function Prototypes: */ /* Function Prototypes: */
uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue, uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
const uint16_t wIndex, const uint16_t wIndex,
const void** const DescriptorAddress) const void** const DescriptorAddress)
ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(3); ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(3);
#endif #endif

2
Makefile
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@ -18,7 +18,7 @@ F_CPU = 16000000
F_USB = $(F_CPU) F_USB = $(F_CPU)
OPTIMIZATION = s OPTIMIZATION = s
TARGET = usbfanctrl 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 LUFA_PATH = LUFA/LUFA
CC_FLAGS = -DUSE_LUFA_CONFIG_HEADER -IConfig CC_FLAGS = -DUSE_LUFA_CONFIG_HEADER -IConfig
LD_FLAGS = LD_FLAGS =

66
event.c Normal file
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/***************************************************************************
* 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 */

27
event.h Normal file
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@ -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__ */

49
main.c
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@ -5,6 +5,9 @@
#include <string.h> #include <string.h>
#include "Descriptors.h" #include "Descriptors.h"
#include "event.h"
#include "pwm.h"
#include "timer.h"
#include <LUFA/Drivers/USB/USB.h> #include <LUFA/Drivers/USB/USB.h>
#include <LUFA/Platform/Platform.h> #include <LUFA/Platform/Platform.h>
@ -39,12 +42,52 @@ int main(void)
{ {
SetupHardware(); SetupHardware();
timer_init();
pwm_init();
GlobalInterruptEnable(); 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 (;;) 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 */ /* Disable clock division */
clock_prescale_set(clock_div_1); 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 /** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and

354
pwm.c Normal file
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@ -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 */

32
pwm.h Normal file
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@ -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__ */

133
timer.c Normal file
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@ -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 */

25
timer.h Normal file
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#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__ */