Programming MSP430 on board button

To get user input or to make a switch working in MSP430 Launchpad first we will try programming the on board button P1.3 to read user inputs

Connect P1.3 pin to Vcc through a resistor…Thecode to get user input is below

/*button_press.c
ganeshredcobra@gmail.com
GPL
on board button S2 is used in this example...
connect P1.3 to vcc through a resistor...
*/
#include <msp430g2553.h>

volatile unsigned int i;//to prevent optimization
void main(void)
{
WDTCTL=WDTPW+WDTHOLD;
P1DIR|=0X01;//set all bits in P1 to input except BIT0
for(;;)
{
P1OUT=0x01;//BIT 0 LED ON
while((P1IN & BIT3)==0)//while pusing S1
P1OUT=0X00;//LED OFF
}
}

The above code sets the red led on whenever we pushes the button the led is turned off….The code is self explanatory with comments…

This is an example of polling…

Happy Hacking 🙂

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