Question

STM8S单片机 定时器TIM1 设置输出PWM没有输出，只能输出一个固定的PWM。求解！

#include<iostm8s003f3.h>
#include<intrinsics.h>
void CLK_Init()
{
CLK_CKDIVR = 0x18; // 16M/8 =2M;
}

void DelayMS(unsigned int ms)
{
unsigned int i;
while(ms != 0)
{
for(i = 0; i < 200;i++)
{

for(i = 0; i < 150;i++);

}
ms--;
}
}
void Tim1_Config(void)
{
TIM1_PSCRH =199/256; //必须先高8位再低8位 update：999
TIM1_PSCRL = 199%256; //技术时钟= 2MHz/（199+1）= 10KHz 计数周期为0.1ms

TIM1_CCMR3 |=0x60; //output mode1 PWM 强制为有效电平强制OC2REF为高
TIM1_CCER2 |= 0x01; //捕获使能

TIM1_ARRH =100/256;
TIM1_ARRL = 100%256; //脉冲周期 = 10ms

TIM1_CCR3H = 0;
TIM1_CCR3L = 0;
TIM1_BKR =0x80; //TIM1必须写，TIM2，3没有此寄存器
TIM1_CR1 =0x01; //启动计数
}
void PWM1_Config(unsigned int duty)
{
TIM1_CCR3H = duty/256;
TIM1_CCR3L = duty%256;
}
unsigned int id;
main()
{
CLK_Init();
Tim1_Config();
while(1)
{
for (id = 0; id <=100; id++)
{
PWM1_Config(id);
DelayMS(10);
}
for (id = 100; id > 0;id--)
{
PWM1_Config(id);
DelayMS(10);
}
}
}

Answer 1

在程序完全正确的情况下，还要根据所用的编程软件设置选项字节的。