STM8S TIM1寄存器 PWM呼吸灯* t t5 A* `9 N2 \
原理图:
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1.TIM1 初始化6 ?- M8 g. ~0 k7 ^. W, v8 I4 r
- void TIM1_Init(void)
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- TIM1_PSCRH = 0;
2 ]; _4 |2 `: g - TIM1_PSCRL = 15; //(15+1)分频为1M; b+ V" F9 m* X
- TIM1_ARRH = 0x03;& a, M6 P* X" e
- TIM1_ARRL = 0xE8; //每1000us中断一次& k8 c! q, ~, }* w' k- I4 D( t
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- TIM1_CCMR2_OC2M = 6; //PWM2模式1& T5 a9 W# E1 z% o8 W F0 D
- TIM1_CCER1_CC2E = 1; //CC2引脚使能* R4 B+ u" c% m/ d% I
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# {, R7 D% E) @, O% L! ~ - TIM1_CCMR3_OC3M = 6; //PWM3模式1
6 A6 i* ?2 \/ B2 O( @7 \: D - TIM1_CCER2_CC3E = 1; //CC3引脚使能
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- TIM1_CCR2H = 0X00; //DUTY 1 Q4 H; c: K% B2 Y A. z% C
- TIM1_CCR2L = 0x00; : D. w' A5 r# Y* _
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$ L7 y4 Y. x& k' Y3 o x - TIM1_CCR3H = 0X00; //DUTY
1 D' L3 L0 I) a. f4 ~ - TIM1_CCR3L = 0x00; ) I2 r$ i3 ^. c' {' t& K$ n
- TIM1_BKR |= 0x80; //设置刹车寄存器) c$ B# ?7 P) j( n8 ?6 o7 s2 ?: b
- TIM1_IER = 0x01; //允许更新中断
3 N% V' i+ ^$ b2 n1 o7 w - TIM1_CR1 = 0x01; //计数器使能,开始计数( L& z4 _, m3 F& L- ]+ [: W8 a
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( F" F3 S2 B1 S) Y: I! {2.设置占空比0 _( g+ W$ ^+ v( V% f, k6 ^
- void pwm1_duty(u16 duty)
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# W9 Y. j* [& E+ i( C" z - TIM1_CCR2H=duty>>8;6 B" o8 S& }& @- v" J7 \
- TIM1_CCR2L=(u8)(duty);: F5 O) S$ p; _/ {" L
- TIM1_CCR3H=duty>>8;3 l# [7 z6 `7 q6 N7 n4 [: i
- TIM1_CCR3L=(u8)(duty);) P0 t4 |% r. a0 D- Z
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3.呼吸
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- if(key_value>=1000) dir=0;
% F7 H( [% R5 u# i/ \2 E - if(key_value<=1) dir=1;
7 v l; g2 ~4 [2 d6 P9 p4 O - if(dir) key_value++;
9 f) B3 \+ s1 _8 G2 P - else key_value--;
2 V/ Y* \+ c! G - pwm1_duty(key_value);
% P4 l8 a6 d B/ p& {' \1 X - delay_ms(3);
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3 Q8 @. `% d6 v- w4.实验现象: v O, x1 P3 j# h- L
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