1 LED闪烁实验.zip_LED灯闪烁_led c8051f340

//----------------------------------------------------------------------------- // Includes //----------------------------------------------------------------------------- #include <c8051f340.h> // SFR declarations //----------------------------------------------------------------------------- // Pin Declarations //----------------------------------------------------------------------------- sbit LED1 = P2^2; // LED1 ='1' means ON sbit LED2 = P2^3; // LED2 ='1' means ON //----------------------------------------------------------------------------- // Function Prototypes //----------------------------------------------------------------------------- void OSCILLATOR_Init (void); void PORT_Init (void); void delay(unsigned int t); //----------------------------------------------------------------------------- // main() Routine //----------------------------------------------------------------------------- void main (void) { PCA0MD &= ~0x40; // WDTE = 0 (clear watchdog timer // enable) PORT_Init(); // Initialize Port I/O OSCILLATOR_Init (); // Initialize Oscillator while (1) { LED1 = 1; // Turn on LED delay(500); LED1 = 0; // Else, turn it off delay(500); LED2 = 1; // Turn on LED delay(500); LED2 = 0; // Else, turn it off delay(500); } } //----------------------------------------------------------------------------- // OSCILLATOR_Init //----------------------------------------------------------------------------- void OSCILLATOR_Init (void) { OSCICN |= 0x03; // Configure internal oscillator for // its maximum frequency (24.5 Mhz) } //----------------------------------------------------------------------------- // PORT_Init //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- void PORT_Init (void) { P2MDIN |= 0x0F; // Lower four pins on P2 are digital P2MDOUT = 0x0C; // enable LEDs as push-pull outputs XBR1 = 0x40; // Enable crossbar and enable // weak pull-ups } //----------------------------------------------------------------------------- // Delay //----------------------------------------------------------------------------- void delay(unsigned int t) { unsigned int i,j; for(i=0;i<t;i++) for(j=0;j<250;j++); }