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/************************************************************************/
/* */
/* File: avr/pwm.c */
/* Description: pulse width modulation driver. */
/* Version: 1.0 */
/* Author: Otto Mattik */
/* */
/* (C)Copyright Otto Mattik 2014-2021. */
/* */
/* This file is a part of 'armen' (a tiny operating system). */
/* 'armen' is distributed under the CeCILL-V2.1 licence. For more */
/* details about this licence, please visit the website cecill.info */
/* */
/************************************************************************/
#ifndef AVR_GPIO_C
#error "do not use this code directly, it must be included via gpio.c"
#endif
#if defined(__AVR_ATtiny84__)\
|| defined(__AVR_ATtiny85__)
#if defined(UART) && (UART != 0)
#error "pwm and uart, used together, are incompatible"
#endif
#endif
#if defined(__AVR_ATtiny84__)
#define GPIO_MAX_PWM 1
#elif defined(__AVR_ATtiny841__)
#define GPIO_MAX_PWM 2
#elif defined(__AVR_ATtiny85__)
#define GPIO_MAX_PWM 1
#elif defined(__AVR_ATtiny1634__)
#define GPIO_MAX_PWM 1
#elif defined(__AVR_ATmega328P__)
#define GPIO_MAX_PWM 2
#elif defined(__AVR_ATmega2560__)
#define GPIO_MAX_PWM 5
#endif
/*
__AVR_ATtiny84__
t1, 16 bits, OC1A=PA6/6, OC1B=PA5/5
__AVR_ATtiny85__
t1, 8 bits, OC1A=PB1/1, OC1B=PB4/4
__AVR_ATtiny841__
t1, 16 bits, OC1A=TOCC1|TOCC3|TOCC5|TOCC7, OC1B=TOCC0|TOCC2|TOCC4|TOCC6
t2, 16 bits, OC2A=TOCC1|TOCC3|TOCC5|TOCC7, OC2B=TOCC0|TOCC2|TOCC4|TOCC6
__AVR_ATtiny1634__
t1, 16 bits, OC1A=PC0/16, OC1B=PB3/11
__AVR_ATmega328P__
t1, 16 bits, OC1A=PB1/1, OC1B=PB2/2
t2, 8 bits, OC2A=PB3/3, OC2B=PD3/19
__AVR_ATmega2560__
t1, 16 bits, OC1A=PB5/13, OC1B=PB6/14, 0C1C=PB7/15
t2, 8 bits, OC2A=PB4/12, OC2B=PH6/62
t3, 16 bits, OC3A=PE3/35, OC3B=PE4/36, OC3C=PE5/37
t4, 16 bits, OC4A=PH3/59, OC4B=PH4/60, OC4C=PH5/61
t5, 16 bits, OC5A=PL3/83, OC5B=PL4/84, OC5C=PL5/85
*/
static uint8_t pwm_freq = 0;
static struct {
uint8_t* tccra;
uint8_t* tccrb;
uint8_t* ocra;
uint8_t* ocrb;
uint8_t* ocrc;
uint8_t modea;
uint8_t modeb;
uint8_t bytes;
} pwms[GPIO_MAX_PWM] = {
#if defined(__AVR_ATtiny84__)
{ 0x004F, 0x004E, 0x004A, 0x0048, 0x0000,
(1<<COM1A1)|(1<<COM1B1)|(1<<WGM10), (1<<WGM12), 2 }
#elif defined(__AVR_ATtiny85__)
{ 0x002A, 0x0033, 0x0029, 0x0028, 0x0000,
(1<<COM0A1)(1<<COM0B1)|(1<<WGM01)|(1<<WGM00), 0, 1 }
#elif defined(__AVR_ATtiny841__)
{ 0x004F, 0x004E, 0x004A, 0x0048, 0x0000,
(1<<COM1A1)|(1<<COM1B1)|(1<<WGM10), (1<<WGM12), 2 },
#if 0
{ 0x00CA, 0x00C9, 0x00C4, 0x00C2, 0x0000,
(1<<COM2A1)|(1<<COM2B1)|(1<<WGM20), (1<<WGM22), 2 }
#endif
#elif defined(__AVR_ATtiny1634__)
{ 0x0072, 0x0071, 0x006C, 0x006A, 0x0000,
(1<<COM1A1)|(1<<COM1B1)|(1<<WGM10), (1<<WGM12), 2 }
#elif defined(__AVR_ATmega328P__)
{ 0x0080, 0x0081, 0x0088, 0x008A, 0x0000,
(1<<COM1A1)|(1<<COM1B1)|(1<<WGM10), (1<<WGM12), 2 },
{ 0x00B0, 0x00B1, 0x00B3, 0x00B4, 0x0000,
(1<<COM2A1)|(1<<COM2B1)|(1<<WGM21)|(1<<WGM20), 0, 1 }
#elif defined(__AVR_ATmega2560__)
{ 0x0080, 0x0081, 0x0088, 0x008A, 0x008C,
(1<<COM1A1)|(1<<COM1B1)|(1<<COM1C1)|(1<<WGM10), (1<<WGM12), 2 },
{ 0x00B0, 0x00B1, 0x00B3, 0x00B4, 0x0000,
(1<<COM2A1)|(1<<COM2B1)|(1<<WGM21)|(1<<WGM20), 0, 1 },
{ 0x0090, 0x0091, 0x0098, 0x009A, 0x009C,
(1<<COM3A1)|(1<<COM3B1)|(1<<COM3C1)|(1<<WGM30), (1<<WGM32), 2 },
{ 0x00A0, 0x00A1, 0x00A8, 0x00AB, 0x00AC,
(1<<COM4A1)|(1<<COM4B1)|(1<<COM4C1)|(1<<WGM40), (1<<WGM42), 2 },
{ 0x0120, 0x0121, 0x0128, 0x012A, 0x012C,
(1<<COM5A1)|(1<<COM5B1)|(1<<COM5C1)|(1<<WGM50), (1<<WGM52), 2 }
#endif
};
void gpio_pwm_freq( uint8_t scale )
{
#ifdef CHECK_PARAM
if( scale >= 1 && scale <= 5 )
#endif
{
uint8_t i;
/* set fast pwm (8 bits) mode with OCnA and 0CnB cleared on compare match */
for( i = 0; i < GPIO_MAX_PWM; i++ )
{
*pwms[i].tccra = pwms[i].modea;
#if defined(__AVR_ATmega328P__)\
|| defined(__AVR_ATmega2560__)
if( i == 1 && scale > 2 )
{
uint8_t value;
if( scale == 3 )
value = 4;
else if( scale == 4 )
value = 6;
else
value = 7;
*pwms[i].tccrb = pwms[i].modeb | value;
else
#endif
*pwms[i].tccrb = pwms[i].modeb | scale;
*pwms[i].ocra = 0;
*pwms[i].ocrb = 0;
if( pwms[i].ocrc != 0 )
*pwms[i].ocrc = 0;
}
}
}
void gpio_pwm_set( uint8_t gpio, uint8_t percent )
{
#ifdef CHECK_PARAM
if( gpio < (GPIO_MAX_PORT << 3) )
#endif
{
uint8_t timer = 0;
#if defined(__AVR_ATtiny84__)
if( gpio == 6 || gpio == 5 )
{
gpio = 6 - gpio;
#elif defined(__AVR_ATtiny85__)
if( gpio == 1 || gpio == 4 )
{
gpio = (gpio == 1 ? 0 : 1);
#elif defined(__AVR_ATtiny841__)
if( gpio <= 7 )
{
/* OC1A=TOCC1|TOCC3|TOCC5|TOCC7
OC1B=TOCC0|TOCC2|TOCC4|TOCC6 */
if( gpio <= 3 )
TOCPMSA0 |= (01 << (gpio << 2));
else
TOCPMSA1 |= (01 << ((gpio - 4) << 2));
TOCPMCOE |= (1 << gpio);
gpio = ((gpio & 1) == 1 ? 0 : 1);
#elif defined(__AVR_ATtiny1634__)
if( gpio == 16 || gpio == 11 )
{
gpio = (gpio == 16 ? 0 : 1);
#elif defined(__AVR_ATmega328P__)
if( gpio == 1 || gpio == 2 )
gpio -= 1;
else if( gpio == 3 || gpio == 19 )
{
gpio = (gpio == 3 ? 0 : 1);
timer = 1;
}
else
return;
{
#elif defined(__AVR_ATmega2560__)
if( gpio >= 13 || gpio <= 15 )
gpio -= 13;
else if( gpio == 12 || gpio == 62 )
{
gpio = (gpio == 12 ? 0 : 1);
timer = 1;
}
else if( gpio >= 35 && gpio <= 37 )
{
gpio -= 35;
timer = 2;
}
else if( gpio >= 59 && gpio <= 61 )
{
gpio -= 59;
timer = 3;
}
else if( gpio >= 83 && gpio <= 85 )
{
gpio -= 83;
timer = 4;
}
else
return;
{
#endif
percent = (255 * percent) / 100;
if( gpio == 0 )
*pwms[timer].ocra = percent;
#if defined(__AVR_ATmega2560__)
else if( gpio == 2 )
*pwms[timer].ocrc = percent;
#endif
else
*pwms[timer].ocrb = percent;
}
}
}
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