stm8单片机TIM1变频程序

ID:162811 · 发表于 2022-7-27 10:37

#include "IOSTM8S103F3.h"

unsigned int FRE=200;          //frequency  频率 4M / 100 = 40K

void PWM_GPIO_Init( void )
{
PC_DDR |= ( 1 << 7 );    //PC7 推挽输出
PC_CR1 |= ( 1 << 7 );
}

void TIM1_Init( void )
{
PWM_GPIO_Init();
TIM1_CR1 = ( 1 << 7 );                            //自动预装载允许
TIM1_CCMR2 = ( 6 << 4 ) | ( 1 << 3 ) | ( 1 << 2 );  //TIM1 CH2 PWM1  输出比较1预装载使能  输出比较1 快速使能
TIM1_CCER1 |= 0x10;                               //CC2为输出高电平有效
TIM1_PSCRH = 0x00;                               //预分频 0
TIM1_PSCRL = 0x03;                               //16M/(1+3)=4 M
TIM1_ARRH = FRE >> 8;                            //设定自动重装载值高8位
TIM1_ARRL = FRE;                                  //设置自动重装载值低8位
TIM1_BKR = 0x80;                                  //刹车寄存器使能OC1输出定时器不工作时输出无效电平
TIM1_EGR = ( 1 << 0 );                            //产生更新事件
TIM1_CR1 |= 0x01;                                  //使能计数器
}

//TIM1 CH2  PC7

void TIM1_CH2_FRE_DC_Change( unsigned int freq, unsigned int dc )
{
TIM1_ARRH = freq >> 8;                   //设置频率
TIM1_ARRL = freq;
TIM1_CCR2H = dc >> 8;
TIM1_CCR2L = dc;
}

void SysClkInit( void )
{
CLK_SWR = 0xe1;    //HSI为主时钟源  16MHz CPU时钟频率
CLK_CKDIVR = 0x00; //CPU时钟0分频，系统时钟0分频
}

void main( void )
{
unsigned int i = 100;
SysClkInit();
__asm( "sim" );
TIM1_Init();
__asm( "rim" );
while( 1 )
{
      for( i = 100; i < 2000; i++ )
      {
         TIM1_CH2_FRE_DC_Change( i, i / 2 );
      }
}
}

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stm8单片机TIM1变频程序

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