求教，TIM1互补输出模式，互补通道的占空比不能改变
本帖最后由 woobruce 于 2018-9-19 12:03 编辑问题已解决，是在其他地方的疏忽以及自己观察不仔细造成的，属于愚蠢的错误，惭愧惭愧。。。。
无论如何，谢谢回复的朋友。
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大家好，最近在看网上的教程自学STM32，今天在试验高级定时器的互补输出时，遇到了一个问题。
具体是，输出通道和互补输出通道各接上一个LED来直观的观察效果。
按照例程配置和初始化定时器和通道后，CH1和CH1N上接的LED会根据初始化时设定的TIM_Pulse值，有不同的明暗度，CH1和CH1N的明暗度相反，这应该符合互补输出的特性。
但是，如果在main函数里修改TIM1->CCR1的值，主通道LED的亮度会变化，但接互补通道的LED亮度没有变化。
请问这是为什么？
希望大家指点一下。
初始化的代码：
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
/*--------------------时基结构体初始化-------------------------*/
TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period=(1000-1);
TIM_TimeBaseStructure.TIM_Prescaler= (72-1);
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter=0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/*--------------------输出比较结构体初始化-------------------*/
TIM_OCInitTypeDefTIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; //反向通道有效
TIM_OCInitStructure.TIM_Pulse = 4;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
TIM_OC1Init(ADVANCE_TIM, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(ADVANCE_TIM, TIM_OCPreload_Enable);
/*-------------------刹车和死区结构体初始化-------------------*/
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
TIM_BDTRInitStructure.TIM_DeadTime = 11;
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(ADVANCE_TIM, &TIM_BDTRInitStructure);
// 使能计数器
TIM_Cmd(ADVANCE_TIM, ENABLE);
TIM_CtrlPWMOutputs(ADVANCE_TIM, ENABLE);Main函数中的代码：实验结果是 只有主通道的LED出来呼吸灯效果，互补通道的LED一直不会动
if((Millis()-recMillis)<=(PWMLightCycle/2))
{
TIM1->CCR1=PWMmax*((Millis()-recMillis)/((float)PWMLightCycle/2));
}
else if((Millis()-recMillis)<=(PWMLightCycle))
{
TIM1->CCR1=PWMmax*(1-((Millis()-recMillis-(PWMLightCycle/2))/((float)PWMLightCycle/2)));
}
else
{
recMillis=Millis();
}
首先对应的GPIO要配置为Alternate function push-pull模式，其次你的正向引作用，反向不起作用的话。
请检查输出模式是否正确。
请参考标准函数库例程“STM32F10x_StdPeriph_Examples\TIM\7PWM_Output”
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
/** @addtogroup STM32F10x_StdPeriph_Examples
* @{
*/
/** @addtogroup TIM_7PWM_Output
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure;
TIM_OCInitTypeDefTIM_OCInitStructure;
uint16_t TimerPeriod = 0;
uint16_t Channel1Pulse = 0, Channel2Pulse = 0, Channel3Pulse = 0, Channel4Pulse = 0;
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @paramNone
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f10x_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f10x.c file
*/
/* System Clocks Configuration */
RCC_Configuration();
/* GPIO Configuration */
GPIO_Configuration();
/* TIM1 Configuration ---------------------------------------------------
Generate 7 PWM signals with 4 different duty cycles:
TIM1CLK = SystemCoreClock, Prescaler = 0, TIM1 counter clock = SystemCoreClock
SystemCoreClock is set to 72 MHz for Low-density, Medium-density, High-density
and Connectivity line devices and to 24 MHz for Low-Density Value line and
Medium-Density Value line devices
The objective is to generate 7 PWM signal at 17.57 KHz:
- TIM1_Period = (SystemCoreClock / 17570) - 1
The channel 1 and channel 1N duty cycle is set to 50%
The channel 2 and channel 2N duty cycle is set to 37.5%
The channel 3 and channel 3N duty cycle is set to 25%
The channel 4 duty cycle is set to 12.5%
The Timer pulse is calculated as follows:
- ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100
----------------------------------------------------------------------- */
/* Compute the value to be set in ARR regiter to generate signal frequency at 17.57 Khz */
TimerPeriod = (SystemCoreClock / 17570 ) - 1;
/* Compute CCR1 value to generate a duty cycle at 50% for channel 1 and 1N */
Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);
/* Compute CCR2 value to generate a duty cycle at 37.5%for channel 2 and 2N */
Channel2Pulse = (uint16_t) (((uint32_t) 375 * (TimerPeriod - 1)) / 1000);
/* Compute CCR3 value to generate a duty cycle at 25%for channel 3 and 3N */
Channel3Pulse = (uint16_t) (((uint32_t) 25 * (TimerPeriod - 1)) / 100);
/* Compute CCR4 value to generate a duty cycle at 12.5%for channel 4 */
Channel4Pulse = (uint16_t) (((uint32_t) 125 * (TimerPeriod- 1)) / 1000);
/* Time Base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/* Channel 1, 2,3 and 4 Configuration in PWM mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse = Channel3Pulse;
TIM_OC3Init(TIM1, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse = Channel4Pulse;
TIM_OC4Init(TIM1, &TIM_OCInitStructure);
/* TIM1 counter enable */
TIM_Cmd(TIM1, ENABLE);
/* TIM1 Main Output Enable */
TIM_CtrlPWMOutputs(TIM1, ENABLE);
while (1)
{}
}
/**
* @briefConfigures the different system clocks.
* @paramNone
* @retval None
*/
void RCC_Configuration(void)
{
/* TIM1, GPIOA, GPIOB, GPIOE and AFIO clocks enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOE|
RCC_APB2Periph_GPIOB |RCC_APB2Periph_AFIO, ENABLE);
}
/**
* @briefConfigure the TIM1 Pins.
* @paramNone
* @retval None
*/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
#ifdef STM32F10X_CL
/* GPIOE Configuration: Channel 1/1N, 2/2N, 3/3N and 4 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_11|GPIO_Pin_13|GPIO_Pin_14|
GPIO_Pin_8|GPIO_Pin_10|GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOE, &GPIO_InitStructure);
/* TIM1 Full remapping pins */
GPIO_PinRemapConfig(GPIO_FullRemap_TIM1, ENABLE);
#else
/* GPIOA Configuration: Channel 1, 2 and 3 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* GPIOB Configuration: Channel 1N, 2N and 3N as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_Init(GPIOB, &GPIO_InitStructure);
#endif
}
修改配置前：
TIM_Cmd(TIM1, DIABLE);
然后再修改配置，改完以后：
TIM_Cmd(TIM1, ENABLE);
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