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hello.ftdi.16E5.blink.c

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  • hello.ftdi.16E5.blink.c 1.17 KiB
    //
    // hello.ftdi.16E5.blink.c
    //
    // 16E5 blink
    //
    // Neil Gershenfeld
    // 10/27/15
    //
    // (c) Massachusetts Institute of Technology 2015
    // This work may be reproduced, modified, distributed,
    // performed, and displayed for any purpose. Copyright is
    // retained and must be preserved. The work is provided
    // as is; no warranty is provided, and users accept all 
    // liability.
    //
    
    #include <avr/io.h>
    #include <util/delay.h>
    
    #define VPORTA VPORT0 // pre-mapped virtual port A
    #define VPORTC VPORT1 // pre-mapped virtual port C
    #define VPORTD VPORT2 // pre-mapped virtual port D
    #define VPORTR VPORT3 // pre-mapped virtual port R
    
    #define DELAY 100 // blink delay
    #define LED PIN4_bm // LED bit mask
    
    int main(void) {
       //
       // set up clock
       //
       OSC.CTRL = OSC_RC32MEN_bm; // enable 32MHz clock
       while (!(OSC.STATUS & OSC_RC32MRDY_bm)); // wait for clock to be ready
       CCP = CCP_IOREG_gc; // enable protected register change
       CLK.CTRL = CLK_SCLKSEL_RC32M_gc; // switch to 32MHz clock
       //
       // set up port
       //
       VPORTA.DIR = LED;
       //
       // main loop
       //
       while (1) {
          VPORTA.OUT = LED;
          _delay_ms(DELAY);
          VPORTA.OUT = 0;
         _delay_ms(DELAY);
         }
       }