/*-----------------------Include header file area-------------------------*/
#include /*-----------------------Function declaration area---------------------------*/ void delay(unsigned int xms); //delay function declaration /*-----------------------Main function area-----------------------------*/ void main() { unsigned char i,j; //define unsigned character type variables i and j (range 0~255) while(1) // Repeat the while loop program { i=0xFF; //assign value 1111 1111 to i P2=i; //Assign the value of i to the P2 port delay(500); //delay 500ms for(j=0;j<8;j++) // loop 8 times { i=i<<1; //Shift the value of i left by 1 bit (discard the high bit and fill the low bit with 0) P2=i; //Assign the value of i to port P2 delay(500); //delay 500ms } } } /*---------------------------------------------------------------- Function name: delay Function: Delay Function parameter: xms is the delay time Return value: None ----------------------------------------------------------------*/ void delay(unsigned int xms) { unsigned int i,j; //define unsigned integer variable i (range 0~65535) for(i=xms;i>0;i--) //Execute xms times, i.e. delay x milliseconds for(j=115;j>0;j--); //Delay 1ms (assign a delay value of 1ms to i, and when the loop body is empty, execute the i-- instruction 115 times for 1ms) }
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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