introduction to ARM C programming language

ARM C programming

1. ARM C programming

2. #include "lpc214x.h" // Include LPC2148 header file #define LED_PIN 16 // Define LED to PIN 16 #define LED_PORT IO1PIN // Define LED to Port1 #define LED_DIR IO1DIR // Define Port1 direction register void delayMs (unsigned int x); int main() { PINSEL2 = 0x00000000; // Define port lines as GPIO LED_DIR |= (1 << LED_PIN); // Define LED pin as O/P LED_PORT &= ~(1 << LED_PIN); // Turn off the LED initially while(1) // Loop forever { LED_PORT |= (1 << LED_PIN); // Turn ON LED delayMs (1000); // 1 second delay LED_PORT &= ~(1 << LED_PIN); // Turn OFF LED delayMs (1000); // 1 second delay } return 0; } //Blocking delay function void delayMs (unsigned int x) { unsigned int j; for(;x>0;x--) for(j=0; j<0x1FFF; j++ ); }

3. #include <lpc214x.h> int main ( void ) { IO1DIR &= ~ ( 1 << 16 ) ; // explicitly making P1.16 as Input IO0DIR |= ( 1 << 10 ) ; // Configuring P0.10 as Output while ( 1 ) { if ( ! ( IO1PIN & ( 1 << 16 ))) // Evaluates to True for a 'LOW' on P1.16 { IO0CLR |= ( 1 << 10 ) ; // drive P0.30 LOW, turn LED ON } else { IO0SET |= ( 1 << 10 ) ; // drive P0.30 HIGH, turn LED OFF } } return 0; }