#include
#define uint unsigned int
#define uchar unsigned char
sbit k1=P3^2;
sbit k2=P3^3;
sbit bee=P1^2;
volatile PWM,num;
void delay(float z)
{
flying i;
while(z--)
{
for(i=120;i>0;i--);
}
}
void spk()
{
bee=0;
delay(100);
bee=1;
delay(100);
}
void init_t0()
{
TMOD=0X01;
TH0=255;
TL0=256-PWM;
EA=1;
ET0=1;
TR0=1;
}
void key_scan()
{
while(k1==0)
{
if(PWM!=0XFF)
{
PWM++;
delay(10);
}
else
spk();
}
while(k2==0)
{
if(PWM!=0X01)
{
PWM--;
delay(10);
}
else
spk();
}
}
void main()
{
PWM=0X7f;
P2=0XFF;
init_t0();
while(1)
key_scan();
}
void t0() interrupt 1
{
num++;
TR0=0;
if(num%2==1)
{
P2=0;
TH0=0XFF;
TL0=256-PWM;
TR0=1;
}
if(num%2==0)
{
P2=0XFF;
TH0=0XFF;
TL0=PWM;
TR0=1;
}
}
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Recommended ReadingLatest update time:2024-11-16 19:46
STM32 Timer PWM_Output
The pulse width modulation mode can generate a signal with a frequency determined by the TIMx_ARR register and a duty cycle determined by the TIMx_CCRx register.
The following is an example of PWM mode 1. The PWM signal reference OCxREF is high when TIMx_CNT
Library function STM32F10x_StdPeriph_Lib_V3.3.0\Proje
[Microcontroller]
Easy to play with STM32 microcontroller (Yang Baijun)
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