STM8S TIM1寄存器 PWM呼吸灯
6 ^$ S! z8 L5 R. t原理图:
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& I& U* f0 ^" x8 e$ s1 j- U4 j1.TIM1 初始化% g# Y: u% a, b1 m- U: M
- void TIM1_Init(void)0 h- a+ L6 M D
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- TIM1_PSCRH = 0;4 z" g* N: {( Z0 u O0 F
- TIM1_PSCRL = 15; //(15+1)分频为1M
3 ^7 T% X% u- x% h& }. O' Z( _$ F: v - TIM1_ARRH = 0x03;# F8 ?3 U' L5 l. [; _9 S' G
- TIM1_ARRL = 0xE8; //每1000us中断一次8 W* F4 ^4 @) ~, {' w7 {5 n6 R
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/ b: D' T6 U4 U - TIM1_CCMR2_OC2M = 6; //PWM2模式19 e; r( R( r+ w6 m
- TIM1_CCER1_CC2E = 1; //CC2引脚使能
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( Y. `. U7 ]$ I) } - TIM1_CCMR3_OC3M = 6; //PWM3模式1% y# `. g3 N' a
- TIM1_CCER2_CC3E = 1; //CC3引脚使能
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) I& C% z* B* C* g6 b - TIM1_CCR2H = 0X00; //DUTY , F: D% y" ]* K0 @ s) J+ i& c9 V6 [
- TIM1_CCR2L = 0x00;
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- TIM1_CCR3H = 0X00; //DUTY
, \, `4 d& P7 i& u# W - TIM1_CCR3L = 0x00; 7 H. @ D0 J7 @# r5 _3 l
- TIM1_BKR |= 0x80; //设置刹车寄存器
) _0 Z, w1 E6 _5 m3 W - TIM1_IER = 0x01; //允许更新中断
8 a* n/ X& e' S1 r - TIM1_CR1 = 0x01; //计数器使能,开始计数% W+ p. d. o5 k, y
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2.设置占空比% z; ?/ m! A8 S0 C D
- void pwm1_duty(u16 duty)
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- TIM1_CCR2H=duty>>8;
4 g& a' V4 {$ \- a7 a) f% o6 O9 E l - TIM1_CCR2L=(u8)(duty);
2 ^0 Y# d& j6 I4 S1 U - TIM1_CCR3H=duty>>8;
" e) |3 z. p9 \& K6 Z% r; t - TIM1_CCR3L=(u8)(duty);8 ]6 F% w% {- ?, F% {# T. X
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3.呼吸
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- if(key_value>=1000) dir=0;
+ L" {' g; h; x* B2 q - if(key_value<=1) dir=1;0 h j3 s$ v% g4 a: t
- if(dir) key_value++;
E& u, e6 o8 A$ ` - else key_value--;
5 K0 K! S) `2 r- J- u - pwm1_duty(key_value);
! l/ }1 h# p6 M6 @ - delay_ms(3);( U% @- L0 I% I, C M& e
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. f# f+ H* l/ I9 g: \4.实验现象:
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