GD32F190定时器的使用-PWM占空比的调节

2016-6-23 14:30:18 7683 定时器

0 学习190的板子也还是老套路，先是建立一个模板工程，之后点灯……这些都没有什么难度，就不发帖子了。需要注意的是190的结构和STM32还是有点区别的，时钟的设置略有差别。这次想拿小红板用来控制电机，因此PWM是必不可少的。由于没有示波器，就拿LED用来验证占空比是否改变。以下是定时器2的初始化设置部分代码：另外，在使用小红版的过程中，频繁出现小红板与电脑断开连接的问题，一开始以为是数据线的问题，换过几根数据线后，并没有解决问题，应该是小红版的问题，不知道是否和u**hub芯片的发热有关。 void tiMER_Configuration(void) { / ----------------------------------------------------------------------- TIMER2 Configuration: generate 3 PWM signals with 3 different duty cycles: TIMER2CLK = SystemCoreClock / 72 = 1MHz TIMER2 Channel2 duty cycle = (4000/ 16000)* 100 = 25% TIMER2 Channel3 duty cycle = (8000/ 16000)* 100 = 50% TIMER2 Channel4 duty cycle = (12000/ 16000)* 100 = 75% ----------------------------------------------------------------------- / GPIO_InitPara GPIO_InitStructure; TIMER_BaseInitPara TIMER_TimeBaseStructure; TIMER_OCInitPara TIMER_OCInitStructure; NVIC_InitPara NVIC_InitStructure; RCC_AHBPeriphClock_Enable( RCC_AHBPERIPH_GPIOB, ENABLE); / TIMERS clock enable / RCC_APB2PeriphClock_Enable(RCC_APB2PERIPH_TIMER1\|RCC_APB2PERIPH_TIMER15\|RCC_APB2PERIPH_TIMER16\|RCC_APB2PERIPH_TIMER17,ENABLE); RCC_APB1PeriphClock_Enable(RCC_APB1PERIPH_TIMER2\|RCC_APB1PERIPH_TIMER3\|RCC_APB1PERIPH_TIMER6\|RCC_APB1PERIPH_TIMER14,ENABLE); /Configure PB3 PB10 PB11(TIMER2 CH2 CH3 CH4) as alternate function/ GPIO_InitStructure.GPIO_Pin = GPIO_PIN_3\|GPIO_PIN_10\|GPIO_PIN_11; GPIO_InitStructure.GPIO_Mode = GPIO_MODE_AF; GPIO_InitStructure.GPIO_Speed = GPIO_SPEED_50MHZ; GPIO_InitStructure.GPIO_OType = GPIO_OTYPE_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PUPD_NOPULL; GPIO_Init(GPIOB,&GPIO_InitStructure); GPIO_PinAFConfig(GPIOB,GPIO_PINSOURCE3,GPIO_AF_2); GPIO_PinAFConfig(GPIOB,GPIO_PINSOURCE10,GPIO_AF_2); GPIO_PinAFConfig(GPIOB,GPIO_PINSOURCE11,GPIO_AF_2); / TIMER2 configuration / TIMER_DeInit(TIMER2); TIMER_TimeBaseStructure.TIMER_Prescaler = 71; TIMER_TimeBaseStructure.TIMER_CounterMode = TIMER_COUNTER_UP; TIMER_TimeBaseStructure.TIMER_Period = 15999; TIMER_TimeBaseStructure.TIMER_ClockDivision = TIMER_CDIV_DIV1; TIMER_BaseInit(TIMER2,&TIMER_TimeBaseStructure); TIMER_INTConfig(TIMER2,TIMER_INT_UPDATE,ENABLE); / CH2,CH3 and CH4 Configuration in PWM mode / TIMER_OCInitStructure.TIMER_OCMode = TIMER_OC_MODE_PWM1; TIMER_OCInitStructure.TIMER_OCPolarity = TIMER_OC_POLARITY_HIGH; TIMER_OCInitStructure.TIMER_OutputState = TIMER_OUTPUT_STATE_ENABLE; TIMER_OCInitStructure.TIMER_Pulse = 39; TIMER_OC2_Init(TIMER2, &TIMER_OCInitStructure); TIMER_OC2_Preload(TIMER2,TIMER_OC_PRELOAD_DISABLE); TIMER_OCInitStructure.TIMER_Pulse = 79; TIMER_OC3_Init(TIMER2, &TIMER_OCInitStructure); TIMER_OC3_Preload(TIMER2,TIMER_OC_PRELOAD_DISABLE); TIMER_OCInitStructure.TIMER_Pulse = 119; TIMER_OC4_Init(TIMER2, &TIMER_OCInitStructure); TIMER_OC4_Preload(TIMER2,TIMER_OC_PRELOAD_DISABLE); / Auto-reload preload enable / TIMER_CARLPreloadConfig(TIMER2,ENABLE); / TIMER enable counter*/ TIMER_Enable( TIMER2, ENABLE ); NVIC_PRIGroup_Enable(NVIC_PRIGROUP_1); NVIC_InitStructure.NVIC_IRQ=TIMER2_IRQn; NVIC_InitStructure.NVIC_IRQPreemptPriority=0; NVIC_InitStructure.NVIC_IRQSubPriority=1; NVIC_InitStructure.NVIC_IRQEnable=ENABLE; NVIC_Init(&NVIC_InitStructure); } [color=rgb(51, 102, 153) !important]复制代码 0
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lee_st · 2016-6-24 10:04:52 沙发实验中使用两个用户按键对占空比进行调节，为了让先是效果比较显著，调节的步长比较大。 void EXIT_Init(void) { GPIO_InitPara GPIO_InitStructure; EXTI_InitPara EXTI_InitStructure; NVIC_InitPara NVIC_InitStructure; RCC_AHBPeriphClock_Enable(RCC_AHBPERIPH_GPIOB,ENABLE); GPIO_InitStructure.GPIO_Pin=GPIO_PIN_6; GPIO_InitStructure.GPIO_Mode=GPIO_MODE_IN; GPIO_InitStructure.GPIO_PuPd=GPIO_PUPD_NOPULL; GPIO_Init(GPIOB,&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin=GPIO_PIN_6; GPIO_InitStructure.GPIO_Mode=GPIO_MODE_IN; GPIO_InitStructure.GPIO_PuPd=GPIO_PUPD_NOPULL; GPIO_Init(GPIOB,&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin=GPIO_PIN_7; GPIO_InitStructure.GPIO_Mode=GPIO_MODE_IN; GPIO_InitStructure.GPIO_PuPd=GPIO_PUPD_NOPULL; GPIO_Init(GPIOB,&GPIO_InitStructure); RCC_APB2PeriphClock_Enable(RCC_APB2PERIPH_CFG,ENABLE); SYSCFG_EXTILine_Config(EXTI_SOURCE_GPIOB,EXTI_SOURCE_PIN6); SYSCFG_EXTILine_Config(EXTI_SOURCE_GPIOB,EXTI_SOURCE_PIN7); EXTI_InitStructure.EXTI_LINE=EXTI_LINE6; EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt; EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling; EXTI_InitStructure.EXTI_LINEEnable=ENABLE; EXTI_Init(&EXTI_InitStructure); EXTI_ClearIntBitState(EXTI_LINE6); EXTI_InitStructure.EXTI_LINE=EXTI_LINE7; EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt; EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling; EXTI_InitStructure.EXTI_LINEEnable=ENABLE; EXTI_Init(&EXTI_InitStructure); EXTI_ClearIntBitState(EXTI_LINE7); NVIC_PRIGroup_Enable(NVIC_PRIGROUP_1); NVIC_InitStructure.NVIC_IRQ=EXTI4_15_IRQn; NVIC_InitStructure.NVIC_IRQPreemptPriority=0; NVIC_InitStructure.NVIC_IRQSubPriority=0; NVIC_InitStructure.NVIC_IRQEnable=ENABLE; NVIC_Init(&NVIC_InitStructure); } int KEY_SCAN(void) { int count=0xfff; if(EXTI_GetIntBitState(EXTI_LINE6)!=RESET) { while(count--) ; if(EXTI_GetIntBitState(EXTI_LINE6)!=RESET) { EXTI_ClearIntBitState(EXTI_LINE6); return 1; } } if(EXTI_GetIntBitState(EXTI_LINE7)!=RESET) { while(count--) ; if(EXTI_GetIntBitState(EXTI_LINE7)!=RESET) { EXTI_ClearIntBitState(EXTI_LINE7); return 2; } } return 0; } void EXTI4_15_IRQHandler(void) { unsigned int temp=15999; int key; key=KEY_SCAN(); if(key==1) { t+=500; if(t>=16000) t=15999; TIMER_Compare3Config( TIMER2, t); } if(key==2) { t-=500; if(t<=500) t=500; TIMER_Compare3Config( TIMER2, t); } } [color=rgb(51, 102, 153) !important]复制代码

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