【求助】怎样PORTD这种命灵控制digitalWrite?

shineiku

想控制一个热水器，但用示波器看到的信号频率很高，和arduino 不是一个级别的，看到网上说portd这样的命令效率很高，想试一试，需要设置一个数字口为输出，设置为高电平，在设置为低电平，请问用那种方式怎么写？另外如果arduino 解决不了，我应该用什么方式能实现，成不不要太高。谢谢！

hmjack2008

Port Registers :
http://arduino.cc/en/Reference/PortManipulation

PORTD maps to Arduino digital pins 0 to 7
DDRD - The Port D Data Direction Register - read/write
PORTD - The Port D Data Register - read/write
PIND - The Port D Input Pins Register - read only

PORTB maps to Arduino digital pins 8 to 13 The two high bits (6 & 7) map to the crystal pins and are not usable
DDRB - The Port B Data Direction Register - read/write
PORTB - The Port B Data Register - read/write
PINB - The Port B Input Pins Register - read only

PORTC maps to Arduino analog pins 0 to 5. Pins 6 & 7 are only accessible on the Arduino Mini
DDRC - The Port C Data Direction Register - read/write
PORTC - The Port C Data Register - read/write
PINC - The Port C Input Pins Register - read only