stm8單片機TIM1變頻程序

ID:162811 · 發表于 2022-7-27 10:37

#include "IOSTM8S103F3.h"

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

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

void TIM1_Init( void )
{
PWM_GPIO_Init();
TIM1_CR1 = ( 1 << 7 );                            //自動預裝載允許
TIM1_CCMR2 = ( 6 << 4 ) | ( 1 << 3 ) | ( 1 << 2 );  //TIM1 CH2 PWM1  輸出比較1預裝載使能  輸出比較1 快速使能
TIM1_CCER1 |= 0x10;                               //CC2為輸出高電平有效
TIM1_PSCRH = 0x00;                               //預分頻 0
TIM1_PSCRL = 0x03;                               //16M/(1+3)=4 M
TIM1_ARRH = FRE >> 8;                            //設定自動重裝載值高8位
TIM1_ARRL = FRE;                                  //設置自動重裝載值低8位
TIM1_BKR = 0x80;                                  //剎車寄存器使能OC1輸出定時器不工作時輸出無效電平
TIM1_EGR = ( 1 << 0 );                            //產生更新事件
TIM1_CR1 |= 0x01;                                  //使能計數器
}

//TIM1 CH2  PC7

void TIM1_CH2_FRE_DC_Change( unsigned int freq, unsigned int dc )
{
TIM1_ARRH = freq >> 8;                   //設置頻率
TIM1_ARRL = freq;
TIM1_CCR2H = dc >> 8;
TIM1_CCR2L = dc;
}

void SysClkInit( void )
{
CLK_SWR = 0xe1;    //HSI為主時鐘源  16MHz CPU時鐘頻率
CLK_CKDIVR = 0x00; //CPU時鐘0分頻，系統時鐘0分頻
}

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單片機TIM1變頻程序

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