求教，STM32F030的PA6，PA7作PWM输出的设置问题

只看该作者 · 2014-8-25 22:52

void PWM_Init(void)
{
GPIO_InitTypeDef       GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef       TIM_OCInitStructure;

// TIM3参数设置
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

// 配置GPIO管脚参数设置
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
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_UP ;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
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_UP ;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_1); // GPIO管脚复用设置
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_1);

TIM_TimeBaseStructure.TIM_Period = 2250;                   //自动重装载值，取值必须在0x0000~0xFFFF之间
TIM_TimeBaseStructure.TIM_Prescaler =0;                   //预分频值，取值必须在0x0000~0xFFFF之间，+1为分频系数
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //时钟分割
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;          //TIM脉冲宽度调制模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_Pulse =0;                         //设置待装入捕获比较寄存器的脉冲值,取值必须在0x0000~0xFFFF之间，占空比101/1001
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;    //输出极性:TIM输出比较极性高
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;

TIM_OC1Init(TIM3, &TIM_OCInitStructure);       //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
TIM_OC3Init(TIM3, &TIM_OCInitStructure);
TIM_OC4Init(TIM3, &TIM_OCInitStructure);
TIM_Cmd(TIM3, ENABLE);
TIM_CtrlPWMOutputs(TIM3, ENABLE);
}
这段程序的PWM输出CH3，CH4没有问题，但是CH1，CH2的PA6，PA7却得不到正确的输出，问题出在哪儿？

只看该作者 · 2014-8-25 23:31

自己顶

只看该作者 · 2014-8-26 10:35

复用时钟开启了吗

只看该作者 · 2014-8-26 12:12

21ID 发表于 2014-8-26 10:35
复用时钟开启了吗

哪个复用时钟？如何开启？能说一下吗？

只看该作者 · 2014-8-27 11:11

beamart 发表于 2014-8-26 12:12
哪个复用时钟？如何开启？能说一下吗？

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB| RCC_APB2Periph_AFIO, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Prescaler = 0;    // 分配系数
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  // 向上计数模式
TIM_TimeBaseStructure.TIM_Period = PWM.TimerPeriod; // PWM 周期
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

你可以参考一下

只看该作者 · 2014-12-4 11:00

本帖最后由 gurong60 于 2014-12-4 11:01 编辑

@香水城 @grant_jx @mmuuss586 @icecut
各位版主来看看，这个问题不知道哪里了

1万 · 2014-12-4 11:25

看5楼

只看该作者 · 2014-12-4 11:33

icecut 发表于 2014-12-4 11:25
看5楼

stm32f030里面没有RCC_APB2Periph_AFIO这个定义

只看该作者 · 2014-12-4 12:16

icecut 发表于 2014-12-4 11:25
看5楼

GPIO_PinAFConfig复用只需要配置这个函数，复用时钟是没有的

3万 · 2014-12-4 12:27

3,4有输出，1,2没输出；
说明PWM初始化没问题，也许引脚配置问题；

3万 · 2014-12-4 12:35

/**
  * @brief  Configure the TIM1 Pins.
  * @param  None
  * @retval None
  */
static void TIM_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* GPIOA Clocks enable */
  RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);

  /* GPIOA Configuration: Channel 1, 2, 3 and 4 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;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_2);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_2);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_2);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_2);

  /* TIM1 Configuration ---------------------------------------------------
Generate PWM signals with 4 different duty cycles:
TIM1 input clock (TIM1CLK) is set to APB2 clock (PCLK2)
=> TIM1CLK = PCLK2 = SystemCoreClock
TIM1CLK = SystemCoreClock, Prescaler = 0, TIM1 counter clock = SystemCoreClock
SystemCoreClock is set to 48 MHz for STM32F0xx devices

The objective is to generate 4 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

Note:
SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f0xx.c file.
Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate()
function to update SystemCoreClock variable value. Otherwise, any configuration
based on this variable will be incorrect.
  ----------------------------------------------------------------------- */
  /* 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 */
  Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);
  /* Compute CCR2 value to generate a duty cycle at 37.5%  for channel 2 */
  Channel2Pulse = (uint16_t) (((uint32_t) 375 * (TimerPeriod - 1)) / 1000);
  /* Compute CCR3 value to generate a duty cycle at 25%  for channel 3 */
  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);

  /* TIM1 clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE);

  /* 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_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  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_OCInitStructure.TIM_Pulse = Channel1Pulse;
  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);
}

3万 · 2014-12-4 12:35

按官方的例程改下看看；

只看该作者 · 2014-12-4 13:18

本帖最后由 gurong60 于 2014-12-4 14:06 编辑

mmuuss586 发表于 2014-12-4 12:35
按官方的例程改下看看；

就是按官方例程改的

只看该作者 · 2014-12-4 13:44

根据官方的例程修改啊！

1万 · 2014-12-4 17:30

gurong60 发表于 2014-12-4 13:18
就是按官方例程改的

你看明白再改.别乱删

只看该作者 · 2014-12-4 17:40

icecut 发表于 2014-12-4 17:30
你看明白再改.别乱删

看的不够仔细，问题在这里
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE);
我直接替换上面的RCC_APB2Periph_TIM1，实际前面也得改，总线时钟不是apb2

1万 · 2014-12-4 17:51

gurong60 发表于 2014-12-4 17:40
看的不够仔细，问题在这里
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE);
我直接替换上面的RCC ...

恩.细心就好

3万 · 2014-12-4 17:55

gurong60 发表于 2014-12-4 13:18
就是按官方例程改的

改成AF2，PWM1试试看；
主要是手头没有030的板子，要不然可以帮你测试下；

只看该作者 · 2014-12-4 18:04

mmuuss586 发表于 2014-12-4 17:55
改成AF2，PWM1试试看；
主要是手头没有030的板子，要不然可以帮你测试下； ...

解决了，谢谢，

3万 · 2014-12-4 20:11

gurong60 发表于 2014-12-4 18:04
解决了，谢谢，

:loveliness:
也不说怎么解决的；

求教，STM32F030的PA6，PA7作PWM输出的设置问题

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