mirror of
https://github.com/arduino/Arduino.git
synced 2025-02-27 21:54:30 +01:00
Added support for extra analog inputs and pwms on ATmega168.
This commit is contained in:
David A. Mellis
parent
debec4e37f
commit
41d86d5a75
39
readme.txt
39
readme.txt
@ -5,8 +5,6 @@ can be connected to software on your computer (e.g. Flash, Processing, MaxMSP).
|
||||
The boards can be assembled by hand or purchased preassembled; the open-source
|
||||
IDE can be downloaded for free.
|
||||
|
||||
Arduino is an open source project, owned by nobody and supported by many.
|
||||
|
||||
For more information, see the website at: http://www.arduino.cc/
|
||||
or the forums at: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl
|
||||
|
||||
@ -24,15 +22,36 @@ FTDI chip on the board. These can be found in the drivers/ directory.
|
||||
Arduino board and point the Windows Add Hardware wizard to the FTDI USB
|
||||
Drivers directory.
|
||||
|
||||
* On the Mac, mount the FTDIUSBSerialDriver_v2_0_1.dmg disk image and run the
|
||||
* On the Mac, mount the FTDIUSBSerialDriver_v2_1_6.dmg (on PPC Macs) or the
|
||||
FTDIUSBSerialDriver_v2_2_6_Intel.dmg (on Intel Macs) disk image and run the
|
||||
included FTDIUSBSerialDriver.pkg. Also run the macosx_setup.command (after
|
||||
moving the Arduino distribution to your /Applications folder). It corrects
|
||||
permission on a few files for use with the serial port and will prompt you
|
||||
for your password. You may need to reboot after running this script.
|
||||
|
||||
CREDITS
|
||||
Arduino is an open source project, owned by nobody and supported by many.
|
||||
|
||||
The Arduino team is composed of Massimo Banzi, David Cuartielles, Tom Igoe,
|
||||
Gianluca Martino, and David A. Mellis.
|
||||
|
||||
Nicholas Zambetti has contributed from the beginning.
|
||||
|
||||
Yaniv Steiner and Giorgio Olivero have been supporting the project and are
|
||||
working at using it with the Instant Soup platform.
|
||||
|
||||
Arduino uses the GNU avr-gcc toolchain, uisp, avr-libc, avrlib, and code
|
||||
from Processing and Wiring.
|
||||
|
||||
UPDATES
|
||||
|
||||
0005
|
||||
0006
|
||||
|
||||
Added support for analog inputs 6 and 7 and pwm on pins 5 and 6 on the
|
||||
on the ATmega168 used in the Arduino Mini (extra analog inputs not available
|
||||
in DIP ATmega168s).
|
||||
|
||||
0005 - 2006.09.26
|
||||
|
||||
Applied patch from Hans Steiner to improve Linux support by searching for avr
|
||||
tools in the user's path instead of expecting them at a fixed location.
|
||||
@ -112,15 +131,3 @@ This is the first released of the unified IDE + language library
|
||||
it's a terrible hack... but it works. at the moment it's in alpha stage
|
||||
but it can be used to work.
|
||||
The processing preprocessor is included but not used.
|
||||
|
||||
CREDITS
|
||||
The Arduino team is composed of Massimo Banzi, David Cuartielles, Tom Igoe,
|
||||
Gianluca Martino, and David A. Mellis.
|
||||
|
||||
Nicholas Zambetti has contributed from the beginning.
|
||||
|
||||
Yaniv Steiner and Giorgio Olivero have been supporting the project and are
|
||||
working at using it with the Instant Soup platform.
|
||||
|
||||
Arduino uses the GNU avr-gcc toolchain, uisp, avr-libc, avrlib, and code
|
||||
from Processing and Wiring.
|
||||
|
||||
@ -109,15 +109,21 @@ int analog_out_pin_to_timer_array[NUM_DIGITAL_PINS] = {
|
||||
NOT_ON_TIMER,
|
||||
NOT_ON_TIMER,
|
||||
NOT_ON_TIMER,
|
||||
// on the ATmega168, digital pin 3 has pwm
|
||||
// on the ATmega168, digital pin 3 has hardware pwm
|
||||
#if defined(__AVR_ATmega168__)
|
||||
TIMER2B,
|
||||
#else
|
||||
NOT_ON_TIMER,
|
||||
#endif
|
||||
NOT_ON_TIMER,
|
||||
// on the ATmega168, digital pins 5 and 6 have hardware pwm
|
||||
#if defined(__AVR_ATmega168__)
|
||||
TIMER0B,
|
||||
TIMER0A,
|
||||
#else
|
||||
NOT_ON_TIMER,
|
||||
NOT_ON_TIMER,
|
||||
#endif
|
||||
NOT_ON_TIMER,
|
||||
NOT_ON_TIMER,
|
||||
TIMER1A,
|
||||
@ -161,6 +167,10 @@ pin_t analog_in_pin_to_port_array[NUM_ANALOG_IN_PINS] = {
|
||||
{ PC, 3 },
|
||||
{ PC, 4 },
|
||||
{ PC, 5 },
|
||||
#if defined(__AVR_ATmega168__)
|
||||
{ NOT_A_PIN, 6 },
|
||||
{ NOT_A_PIN, 7 },
|
||||
#endif
|
||||
};
|
||||
|
||||
pin_t *analog_in_pin_to_port = analog_in_pin_to_port_array;
|
||||
|
||||
@ -94,6 +94,12 @@ void digitalWrite(int pin, int val)
|
||||
cbi(TCCR1A, COM1B1);
|
||||
|
||||
#if defined(__AVR_ATmega168__)
|
||||
if (analogOutPinToTimer(pin) == TIMER0A)
|
||||
cbi(TCCR0A, COM0A1);
|
||||
|
||||
if (analogOutPinToTimer(pin) == TIMER0B)
|
||||
cbi(TCCR0A, COM0B1);
|
||||
|
||||
if (analogOutPinToTimer(pin) == TIMER2A)
|
||||
cbi(TCCR2A, COM2A1);
|
||||
|
||||
@ -126,6 +132,12 @@ int digitalRead(int pin)
|
||||
cbi(TCCR1A, COM1B1);
|
||||
|
||||
#if defined(__AVR_ATmega168__)
|
||||
if (analogOutPinToTimer(pin) == TIMER0A)
|
||||
cbi(TCCR0A, COM0A1);
|
||||
|
||||
if (analogOutPinToTimer(pin) == TIMER0B)
|
||||
cbi(TCCR0A, COM0B1);
|
||||
|
||||
if (analogOutPinToTimer(pin) == TIMER2A)
|
||||
cbi(TCCR2A, COM2A1);
|
||||
|
||||
@ -194,6 +206,16 @@ void analogWrite(int pin, int val)
|
||||
// set pwm duty
|
||||
OCR1B = val;
|
||||
#if defined(__AVR_ATmega168__)
|
||||
} else if (analogOutPinToTimer(pin) == TIMER0A) {
|
||||
// connect pwm to pin on timer 0, channel A
|
||||
sbi(TCCR0A, COM0A1);
|
||||
// set pwm duty
|
||||
OCR0A = val;
|
||||
} else if (analogOutPinToTimer(pin) == TIMER0B) {
|
||||
// connect pwm to pin on timer 0, channel B
|
||||
sbi(TCCR0A, COM0B1);
|
||||
// set pwm duty
|
||||
OCR0B = val;
|
||||
} else if (analogOutPinToTimer(pin) == TIMER2A) {
|
||||
// connect pwm to pin on timer 2, channel A
|
||||
sbi(TCCR2A, COM2A1);
|
||||
@ -328,15 +350,14 @@ SIGNAL(SIG_OVERFLOW0)
|
||||
|
||||
unsigned long millis()
|
||||
{
|
||||
// timer 0 increments every 8 cycles, and overflows when it reaches 256.
|
||||
// we calculate the total number of clock cycles, then divide by the
|
||||
// number of clock cycles per millisecond.
|
||||
//return timer0_overflow_count * 8UL * 256UL / (F_CPU / 1000UL);
|
||||
// timer 0 increments every 64 cycles, and overflows when it reaches 256.
|
||||
// we would calculate the total number of clock cycles, then divide by the
|
||||
// number of clock cycles per millisecond, but this overflows too often.
|
||||
//return timer0_overflow_count * 64UL * 256UL / (F_CPU / 1000UL);
|
||||
|
||||
// calculating the total number of clock cycles overflows an
|
||||
// unsigned long, so instead find 1/128th the number of clock cycles
|
||||
// and divide by 1/128th the number of clock cycles per millisecond.
|
||||
return timer0_overflow_count * 8UL * 2UL / (F_CPU / 128000UL);
|
||||
// instead find 1/128th the number of clock cycles and divide by 1/128th
|
||||
// the number of clock cycles per millisecond
|
||||
return timer0_overflow_count * 64UL * 2UL / (F_CPU / 128000UL);
|
||||
}
|
||||
|
||||
void delay(unsigned long ms)
|
||||
@ -441,11 +462,20 @@ int main(void)
|
||||
|
||||
// timer 0 is used for millis() and delay()
|
||||
timer0_overflow_count = 0;
|
||||
// set timer 0 prescale factor to 8
|
||||
// on the ATmega168, timer 0 is also used for fast hardware pwm
|
||||
// (using phase-correct PWM would mean that timer 0 overflowed half as often
|
||||
// resulting in different millis() behavior on the ATmega8 and ATmega168)
|
||||
#if defined(__AVR_ATmega168__)
|
||||
sbi(TCCR0A, WGM01);
|
||||
sbi(TCCR0A, WGM00);
|
||||
#endif
|
||||
// set timer 0 prescale factor to 64
|
||||
#if defined(__AVR_ATmega168__)
|
||||
sbi(TCCR0B, CS01);
|
||||
sbi(TCCR0B, CS00);
|
||||
#else
|
||||
sbi(TCCR0, CS01);
|
||||
sbi(TCCR0, CS00);
|
||||
#endif
|
||||
// enable timer 0 overflow interrupt
|
||||
#if defined(__AVR_ATmega168__)
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user