msp430

Msp430 blinky (uses onboard led!)

Get your Energia development package here: http://energia.nu/ /download/ 
http://www.ti.com/ww/en/launchpad/launchpads-msp430-msp-exp430g2.html#tabs

#include  <msp430g2553.h>  unsigned int i = 0;          // Initialize variables. This will keep count of how many cycles between LED toggles void main(void) {   WDTCTL = WDTPW + WDTHOLD;   // Stop watchdog timer. This line of code is needed at the beginning of most MSP430 projects.                               // This line of code turns off the watchdog timer, which can reset the device after a certain period of time.   P1DIR |= 0x01;              // P1DIR is a register that configures the direction (DIR) of a port pin as an output or an input.                               // To set a specific pin as output or input, we write a '1' or '0' on the appropriate bit of the register.                               // P1DIR = <PIN7><PIN6><PIN5><PIN4><PIN3><PIN2><PIN1><PIN0>                               // Since we want to blink the on-board red LED, we want to set the direction of Port 1, Pin 0 (P1.0) as an output                               // We do that by writing a 1 on the PIN0 bit of the P1DIR register                               // P1DIR = <PIN7><PIN6><PIN5><PIN4><PIN3><PIN2><PIN1><PIN0>                               // P1DIR = 0000 0001                               // P1DIR = 0x01     <-- this is the hexadecimal conversion of 0000 0001   for (;;)                    // This empty for-loop will cause the lines of code within to loop infinitely   {     P1OUT ^= 0x01;            // Toggle P1.0 using exclusive-OR operation (^=)                               // P1OUT is another register which holds the status of the LED.                               // '1' specifies that it's ON or HIGH, while '0' specifies that it's OFF or LOW                               // Since our LED is tied to P1.0, we will toggle the 0 bit of the P1OUT register     for(i=0; i< 20000; i++);  //Delay between LED toggles. This for-loop will run until the condition is met.                               //In this case, it will loop until the variable i increments to 20000.   } }