arm7 Litian Electronics lpc2148 GPIO one buzzer test program-EEWORLD

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The experiment uses the output function of P0.22 to control the buzzer. The program sets PINSEL0 to connect P0.22 to GPIO, and sets it to output state through IO0DIR; then sets and clears P0.22 port through IO0DET and IO0CLR to control the buzzer.

#include

void Delay(unsigned long n);

main()

{

PINSEL0=0x00000000; //Set the pin to connect to GPIO

IO0DIR=1<<22; //P0.7 controls the buzzer, set to output

while(1)

{

IO0SET=1<<22; //Buzzer beeps

Delay(100000); //delay

IO0CLR=1<<22; //Buzzer stops beeping

Delay(100000); //delay

}

void Delay(unsigned long n)

{

while(n--);

}

The circuit schematic is shown below:

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