标题:
STM32学习-TIM3 PWM输出
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作者:
xiongxiao
时间:
2015-5-27 16:45
标题:
STM32学习-TIM3 PWM输出
/*******************************************************************************
STM32学习日志(11)---- PWM输出
编译环境: EWARM V5.30
硬件环境: 南京万利 EK-STM32F
作者 : szlihongtao
时间 : 2010-07-05
说明 : 1. 在相应的引脚上可以观察到PWM波形
// PA.06: (TIM3_CH1) STM32F103VBT6----pin31
// PA.07: (TIM3_CH2) STM32F103VBT6----pin32
// PB.00: (TIM3_CH3) STM32F103VBT6----pin35
// PB.01: (TIM3_CH4) STM32F103VBT6----pin36
2. 在运行过程中修改占空比
3. 4路输出波形的频率总是一样的
*******************************************************************************/
#include "stm32f10x.h"
#include "stm32_m.h"
//******************************************************************************
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
uint16_t CCR1_Val = 500;
uint16_t CCR2_Val = 375;
uint16_t CCR3_Val = 250;
uint16_t CCR4_Val = 125;
ErrorStatus HSEStartUpStatus;
//******************************************************************************
// 延时50ms
//******************************************************************************
static void delay(void)
{
INT32U i;
static INT32U jjj=5240*50;
for (i=0; i<jjj; i++);
}
//******************************************************************************
static void delayms(INT16U cnt)
{
INT16U i;
while(cnt--)
for (i=0; i<7333; i++);
}
//******************************************************************************
// 时钟设置初始化
//******************************************************************************
static void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;
/*
RCC_AdjustHSICalibrationValue 调整内部高速晶振(HSI)校准值
RCC_ITConfig 使能或者失能指定的RCC中断
RCC_ClearFlag 清除RCC的复位标志位
RCC_GetITStatus 检查指定的RCC中断发生与否
RCC_ClearITPendingBit 清除RCC的中断待处理位
*/
/* RCC system reset(for debug purpose) */
// 时钟系统复位
RCC_DeInit();
// 使能外部的8M晶振
// 设置外部高速晶振(HSE)
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
// 使能或者失能内部高速晶振(HSI)
RCC_HSICmd(DISABLE);
// 等待HSE起振
// 该函数将等待直到HSE就绪,或者在超时的情况下退出
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
/* HCLK = SYSCLK */
// 设置AHB时钟(HCLK)
RCC_HCLKConfig(RCC_SYSCLK_Div1); // 72 MHz
/* PCLK1 = HCLK/2 */
// 设置低速AHB时钟(PCLK1)
RCC_PCLK1Config(RCC_HCLK_Div2); // 36 MHz
/* PCLK2 = HCLK */
// 设置高速AHB时钟(PCLK2)
RCC_PCLK2Config(RCC_HCLK_Div1); // 72 MHz
/* ADCCLK = PCLK2/8 */
// 设置ADC时钟(ADCCLK)
RCC_ADCCLKConfig(RCC_PCLK2_Div8);
// 设置USB时钟(USBCLK)
// USB时钟 = PLL时钟除以1.5
RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);
// 设置外部低速晶振(LSE)
RCC_LSEConfig(RCC_LSE_OFF);
// 使能或者失能内部低速晶振(LSI)
// LSE晶振OFF
RCC_LSICmd(DISABLE);
// 设置RTC时钟(RTCCLK)
// 选择HSE时钟频率除以128作为RTC时钟
RCC_RTCCLKConfig(RCC_RTCCLKSource_HSE_Div128);
// 使能或者失能RTC时钟
// RTC时钟的新状态
RCC_RTCCLKCmd(DISABLE);
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* PLLCLK = 8MHz * 9 = 72 MHz */
// 设置PLL时钟源及倍频系数
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
/* Enable PLL */
// 使能或者失能PLL
RCC_PLLCmd(ENABLE);
/* Wait till PLL is ready */
// 检查指定的RCC标志位设置与否
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
/* Select PLL as system clock source */
// 设置系统时钟(SYSCLK)
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* Wait till PLL is used as system clock source */
// 返回用作系统时钟的时钟源
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
// 使能或者失能AHB外设时钟
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1
|RCC_AHBPeriph_DMA2
|RCC_AHBPeriph_SRAM
|RCC_AHBPeriph_FLITF
|RCC_AHBPeriph_CRC
|RCC_AHBPeriph_FSMC
|RCC_AHBPeriph_SDIO,DISABLE);
// 使能或者失能APB1外设时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_ALL,DISABLE);
// 强制或者释放高速APB(APB2)外设复位
RCC_APB2PeriphResetCmd(RCC_APB2Periph_ALL,ENABLE);
// 退出复位状态
RCC_APB2PeriphResetCmd(RCC_APB2Periph_ALL,DISABLE);
// 强制或者释放低速APB(APB1)外设复位
RCC_APB1PeriphResetCmd(RCC_APB1Periph_ALL,ENABLE);
// 退出复位状态
RCC_APB1PeriphResetCmd(RCC_APB1Periph_ALL,DISABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); // tim3时钟使能
// 强制或者释放后备域复位
RCC_BackupResetCmd(ENABLE);
// 使能或者失能时钟安全系统
RCC_ClockSecuritySystemCmd(DISABLE);
}
//******************************************************************************
// NVIC设置
//******************************************************************************
static void NVIC_Configuration(void)
{
}
//******************************************************************************
// GPIO设置
//******************************************************************************
static void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// 使能或者失能APB2外设时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOD, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOD, &GPIO_InitStructure);
// PA.06: (TIM3_CH1) STM32F103VBT6----pin31
// PA.07: (TIM3_CH2) STM32F103VBT6----pin32
/* GPIOA Configuration: TIM3 channel 1 and 2 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// PB.00: (TIM3_CH3) STM32F103VBT6----pin35
// PB.01: (TIM3_CH4) STM32F103VBT6----pin36
/* GPIOB Configuration: TIM3 channel 3 and 4 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
//******************************************************************************
static void Tim3_Configuration(void)
{
/* TIM3 clock enable */
//RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
/* -----------------------------------------------------------------------
TIM3 Configuration: generate 4 PWM signals with 4 different duty cycles:
TIM3CLK = 72 MHz, Prescaler = 0x1, TIM3 counter clock = 36 MHz
TIM3 ARR Register = 999 => TIM3 Frequency = TIM3 counter clock/(ARR + 1)
TIM3 Frequency = 36 KHz.
TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR)* 100 = 50%
TIM3 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR)* 100 = 37.5%
TIM3 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR)* 100 = 25%
TIM3 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR)* 100 = 12.5%
----------------------------------------------------------------------- */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 1000-1;
TIM_TimeBaseStructure.TIM_Prescaler = 2-1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
//------------------------------------------------------------------------------
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); // 使能TIMx在CCR1上的预装载寄存器
//------------------------------------------------------------------------------
/* PWM1 Mode configuration: Channel2 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR2_Val;
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);// 使能TIMx在CCR1上的预装载寄存器
//------------------------------------------------------------------------------
/* PWM1 Mode configuration: Channel3 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR3_Val;
TIM_OC3Init(TIM3, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);// 使能TIMx在CCR1上的预装载寄存器
//------------------------------------------------------------------------------
/* PWM1 Mode configuration: Channel4 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR4_Val;
TIM_OC4Init(TIM3, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);// 使能TIMx在CCR1上的预装载寄存器
//------------------------------------------------------------------------------
TIM_ARRPreloadConfig(TIM3, ENABLE); // 使能TIMx在ARR上的预装载寄存器
TIM_SetClockDivision(TIM3,TIM_CKD_DIV4); // 这句话好像没有什么用处
// 设定为 TIM_CKD_DIV4,TIM_CKD_DIV1都是一样的
TIM_Cmd(TIM3, ENABLE); // 定时器开始运行
}
//******************************************************************************
// LED5亮
//******************************************************************************
void Led_RW_ON(void)
{
GPIO_SetBits(GPIOC,GPIO_Pin_4);
}
//******************************************************************************
// LED5灭
//******************************************************************************
void Led_RW_OFF(void)
{
GPIO_ResetBits(GPIOC,GPIO_Pin_4);
}
//******************************************************************************
// 主程序
//******************************************************************************
int main(void)
{
INT8U i;
RCC_Configuration();
GPIO_Configuration();
Tim3_Configuration();
NVIC_Configuration();
delay();
for (i=0;i<3;++i)
{
Led_RW_ON();
delayms(200);
Led_RW_OFF();
delayms(200);
}
//------------------------------------------------------------------------------
for (;;)
{
delayms(3333);
GPIOC->ODR ^= GPIO_Pin_7; // led2 toogle
CCR4_Val = 25; // 对应 PB01,(TIM3_CH4) STM32F103VBT6----pin36
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable ;
TIM_OCInitStructure.TIM_Pulse = CCR4_Val;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OC4Init(TIM3, &TIM_OCInitStructure);
}
}
//******************************************************************************
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval : None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
//******************************************************************************
/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/
//******************************************************************************
/*
LED2---------PC7
LED3---------PC6
LED4---------PC5
LED5---------PC4
KEY2---------PD3
KEY3---------PD4
*/
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作者:
CHao.chen
时间:
2017-11-28 14:58
stm32f100cb芯片用TIM4定时器配置PB9输出PWM波形,用以上类似方式不生效;另外,发现管脚模式配置成复用推挽输出,PB9管脚输出始终为低电平。这是什么原因?
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