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Added all PWM pins for arduino nano.

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Marvin Blum
2017-04-01 02:13:03 +02:00
parent 2af06f8e0a
commit 6074be0eff
3 changed files with 76 additions and 30 deletions
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84
ard/pins.c
View File

@@ -20,6 +20,21 @@ const unsigned char A7 = 0x15;
void analog_read_duty_cycle();
unsigned char map_analog_pin(unsigned char);
void pins_init(){
sei();
// enable ADC (128 bit ADPS scaling factor 0x07) to read analog values
ADCSRA = _BV(ADEN)|_BV(ADIE)|0x07;
// clear timer to compare match for PWM output
TCCR0A |= _BV(WGM01)|_BV(WGM00);
TCCR1A |= _BV(WGM01)|_BV(WGM00);
TCCR2A |= _BV(WGM21)|_BV(WGM20);
// enable interrupt on timer overflow for PWM output
TIMSK0 |= _BV(TOIE0);
}
void pin_mode(unsigned char pin, unsigned char mode){
if(pin > A7){
return;
@@ -122,12 +137,10 @@ unsigned int analog_read(unsigned char pin){
return 0;
}
// enable ADC (128 bit ADPS scaling factor 0x07),
// disable digital input buffer (DIDR0)
ADCSRA = _BV(ADEN)|_BV(ADIE)|0x07;
ADMUX = _BV(REFS0)|pin;
DIDR0 |= _BV(pin);
ADCSRA |= _BV(ADSC); // start
ADCSRA |= _BV(ADSC); // start conversion
// wait for it to finish
while(ADCSRA&_BV(ADSC));
@@ -136,23 +149,54 @@ unsigned int analog_read(unsigned char pin){
return ADC;
}
// TODO support more than pin 6!
void analog_write(unsigned char pin, unsigned char value){
// write digital if possible
if(value == 0){
digital_write(pin, LOW);
return;
}
else if(value == 255){
digital_write(pin, HIGH);
return;
}
if(pin != 3 && pin != 5 && pin != 6 && pin != 9 && pin != 10 && pin != 11){
return;
}
pin_mode(pin, OUTPUT);
// clear timer on compare match
TCCR0A |= _BV(COM0A1)|_BV(WGM01)|_BV(WGM00);
// set interrupt on overflow and value to compare to
TIMSK0 |= _BV(TOIE0);
OCR0A = value;
// set timer scaling to 1, which starts the timer
TCCR0B |= _BV(CS00)|_BV(CS02);
// 1. clear timer on compare match (pins_init)
// 2. set interrupt on overflow (pins_init) and value to compare to
// 3. set timer scaling to 1, which starts the timer
if(pin == 3){
TCCR2A |= _BV(COM2B1);
OCR2B = value;
TCCR2B |= _BV(CS20)|_BV(CS21);
}
else if(pin == 5){
TCCR0A |= _BV(COM0B1);
OCR0B = value;
TCCR0B |= _BV(CS00)|_BV(CS02);
}
else if(pin == 6){
TCCR0A |= _BV(COM0A1);
OCR0A = value;
TCCR0B |= _BV(CS00)|_BV(CS02);
}
else if(pin == 9){
TCCR1A |= _BV(COM1A1);
OCR1A = value;
TCCR1B |= _BV(CS10)|_BV(CS11);
}
else if(pin == 10){
TCCR1A |= _BV(COM1B1);
OCR1B = value;
TCCR1B |= _BV(CS10)|_BV(CS11);
}
else if(pin == 11){
TCCR2A |= _BV(COM2A1);
OCR2A = value;
TCCR2B |= _BV(CS20)|_BV(CS21);
}
}
// maps A0-A7 to 0-7
@@ -165,11 +209,5 @@ unsigned char map_analog_pin(unsigned char pin){
}
// analog to digital converter interrupt handler
ISR(ADC_vect){
// required but not used...
}
// fast PWM overflow interrupt handler
ISR(TIMER0_OVF_vect){
// required but not used...
}
// required, but does not need to do anything
ISR(ADC_vect){}

1
ard/pins.h
View File

@@ -15,6 +15,7 @@ extern const unsigned char A5;
extern const unsigned char A6;
extern const unsigned char A7;
void pins_init();
void pin_mode(unsigned char, unsigned char);
int digital_read(unsigned char);
void digital_write(unsigned char, unsigned char);