// // hello.ftdi.45.port.ino // // tiny45 pin output port hello-world // // Neil Gershenfeld 11/17/19 // // This work may be reproduced, modified, distributed, // performed, and displayed for any purpose, but must // acknowledge this project. Copyright is retained and // must be preserved. The work is provided as is; no // warranty is provided, and users accept all liability. // #define output(directions,pin) (directions |= pin) // set port direction for output #define set(port,pin) (port |= pin) // set port pin #define clear(port,pin) (port &= (~pin)) // clear port pin #define port PORTB #define direction DDRB #define pin (1 << PB1) void setup() { // // set clock divider to /1 // CLKPR = (1 << CLKPCE); CLKPR = (0 << CLKPS3) | (0 << CLKPS2) | (0 << CLKPS1) | (0 << CLKPS0); // // initialize output pin // output(direction,pin); } void loop() { set(port,pin); clear(port,pin); set(port,pin); clear(port,pin); }