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Implemented PWM on pin 11; slowed PWM frequency on pins 9 and 10; documented changes in readme.txt.

This commit is contained in:
David A. Mellis 2006-02-25 13:15:23 +00:00
parent 18fc6d6875
commit aa9ed15849
3 changed files with 89 additions and 34 deletions
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11
readme.txt
View File

@ -41,6 +41,17 @@ may need to reboot after running this script.
UPDATES
0004
Main sketch is now compiled as C++ (instead of C).
Updated avr toolchain.
printInteger(), printHex(), etc. now handle longs.
millis() fixed (now overflows after days, not minutes)
Fixed path to java in Windows run.bat.
Added Matrix and Sprite libraries.
PWM now working on pin 11 (as well as 9 and 10).
Slowed PWM frequency (on all three PWM pins) to 1KHz.
0003
API Changes

8
targets/arduino/pins_arduino.c
View File

@ -43,9 +43,9 @@
// PB6 9| |20 AVCC
// PB7 10| |19 PB5 (D 13)
// (D 5) PD5 11| |18 PB4 (D 12)
// (D 6) PD6 12| |17 PB3 (D 11)
// (D 7) PD7 13| |16 PB2 (D 10)
// (D 8) PB0 14| |15 PB1 (D 9)
// (D 6) PD6 12| |17 PB3 (D 11) PWM
// (D 7) PD7 13| |16 PB2 (D 10) PWM
// (D 8) PB0 14| |15 PB1 (D 9) PWM
// +----+
#define NUM_DIGITAL_PINS 14
@ -118,7 +118,7 @@ pin_t analog_out_pin_to_port_array[NUM_DIGITAL_PINS] = {
{ NOT_A_PIN, NOT_A_PIN },
{ PB, 1 },
{ PB, 2 },
{ NOT_A_PIN, NOT_A_PIN },
{ PB, 3 },
{ NOT_A_PIN, NOT_A_PIN },
{ NOT_A_PIN, NOT_A_PIN },
};

104
targets/arduino/wiring.c
View File

@ -1,8 +1,8 @@
/*
wiring.c - Wiring API Partial Implementation
Part of Arduino / Wiring Lite
Part of Arduino - http://arduino.berlios.de/
Copyright (c) 2005 David A. Mellis
Copyright (c) 2005-2006 David A. Mellis
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@ -77,13 +77,35 @@ int analogInPinToBit(int pin)
return analog_in_pin_to_port[pin].bit;
}
void timer2PWMOn()
{
// configure timer 2 for normal (non-inverting) pwm operation
// this attaches the timer to the pwm pin
sbi(TCCR2, COM21);
cbi(TCCR2, COM20);
}
void timer2PWMOff()
{
// disconnect the timer from the pwm pin
cbi(TCCR2, COM21);
cbi(TCCR2, COM20);
}
void timer2PWMSet(unsigned char val)
{
OCR2 = val;
}
void pinMode(int pin, int mode)
{
if (digitalPinToPort(pin) != NOT_A_PIN) {
if (mode == INPUT)
cbi(_SFR_IO8(port_to_mode[digitalPinToPort(pin)]), digitalPinToBit(pin));
cbi(_SFR_IO8(port_to_mode[digitalPinToPort(pin)]),
digitalPinToBit(pin));
else
sbi(_SFR_IO8(port_to_mode[digitalPinToPort(pin)]), digitalPinToBit(pin));
sbi(_SFR_IO8(port_to_mode[digitalPinToPort(pin)]),
digitalPinToBit(pin));
}
}
@ -99,10 +121,15 @@ void digitalWrite(int pin, int val)
if (analogOutPinToBit(pin) == 2)
timer1PWMBOff();
if (analogOutPinToBit(pin) == 3)
timer2PWMOff();
if (val == LOW)
cbi(_SFR_IO8(port_to_output[digitalPinToPort(pin)]), digitalPinToBit(pin));
cbi(_SFR_IO8(port_to_output[digitalPinToPort(pin)]),
digitalPinToBit(pin));
else
sbi(_SFR_IO8(port_to_output[digitalPinToPort(pin)]), digitalPinToBit(pin));
sbi(_SFR_IO8(port_to_output[digitalPinToPort(pin)]),
digitalPinToBit(pin));
}
}
@ -118,7 +145,11 @@ int digitalRead(int pin)
if (analogOutPinToBit(pin) == 2)
timer1PWMBOff();
return (_SFR_IO8(port_to_input[digitalPinToPort(pin)]) >> digitalPinToBit(pin)) & 0x01;
if (analogOutPinToBit(pin) == 3)
timer2PWMOff();
return (_SFR_IO8(port_to_input[digitalPinToPort(pin)]) >>
digitalPinToBit(pin)) & 0x01;
}
return LOW;
@ -170,6 +201,10 @@ void analogWrite(int pin, int val)
pinMode(pin, OUTPUT);
timer1PWMBOn();
timer1PWMBSet(val);
} else if (analogOutPinToBit(pin) == 3) {
pinMode(pin, OUTPUT);
timer2PWMOn();
timer2PWMSet(val);
} else if (val < 128)
digitalWrite(pin, LOW);
else
@ -220,29 +255,31 @@ void printString(char *s)
void printIntegerInBase(unsigned long n, unsigned long base)
{
unsigned char buf[8 * sizeof(long)]; // Assumes 8-bit chars.
unsigned long i = 0;
unsigned char buf[8 * sizeof(long)]; // Assumes 8-bit chars.
unsigned long i = 0;
if (n == 0) {
printByte('0');
return;
}
if (n == 0) {
printByte('0');
return;
}
while (n > 0) {
buf[i++] = n % base;
n /= base;
}
while (n > 0) {
buf[i++] = n % base;
n /= base;
}
for (; i > 0; i--)
printByte(buf[i - 1] < 10 ? '0' + buf[i - 1] : 'A' + buf[i - 1] - 10);
for (; i > 0; i--)
printByte(buf[i - 1] < 10 ?
'0' + buf[i - 1] :
'A' + buf[i - 1] - 10);
}
void printInteger(long n)
{
if (n < 0) {
printByte('-');
n = -n;
}
if (n < 0) {
printByte('-');
n = -n;
}
printIntegerInBase(n, 10);
}
@ -284,9 +321,8 @@ unsigned long millis()
// overflows when it reaches 256. we calculate the total
// number of clock cycles, then divide by the number of clock
// cycles per millisecond.
//return timer0GetOverflowCount() * timer0GetPrescaler() * 256L / (F_CPU / 1000L);
return (unsigned long) timer0GetOverflowCount() * timer0GetPrescaler() * 2UL / (F_CPU / 128000UL);
//return (((unsigned long) timer0GetOverflowCount()) / 62UL) * (unsigned long) timer0GetPrescaler();
return (unsigned long) timer0GetOverflowCount() *
timer0GetPrescaler() * 2UL / (F_CPU / 128000UL);
}
void delay(unsigned long ms)
@ -332,18 +368,26 @@ void delayMicroseconds(unsigned int us)
int main(void)
{
// this needs to be called before setup() or some functions won't
// work there
sei();
// timer 0 is used for millis() and delay()
timer0Init();
// timer 1 is used for the hardware pwm
// timers 1 & 2 are used for the hardware pwm
timer1Init();
timer1SetPrescaler(TIMER_CLK_DIV1);
//timer1SetPrescaler(TIMER_CLK_DIV1);
timer1PWMInit(8);
timer2Init();
//a2dInit();
//a2dSetPrescaler(ADC_PRESCALE_DIV128);
// configure timer 2 for phase correct pwm
// this is better for motors as it ensures an even waveform
// note, however, that fast pwm mode can achieve a frequency of up
// 8 MHz (with a 16 MHz clock) at 50% duty cycle
cbi(TCCR2, WGM21);
sbi(TCCR2, WGM20);
// set a2d reference to AVCC (5 volts)
cbi(ADMUX, REFS1);