例程(5)
This example shows how to configure the TIM peripheral in Output Compare Timing
mode with the corresponding Interrupt requests for each channel in order to generate
4 different time bases.
The TIMxCLK frequency is set to 36 MHz, the Prescaler is 4 so the TIM2 counter
clock is 7.2 MHz.
The TIM2 CC1 register value is equal to 49152,
CC1 update rate = TIM2 counter clock / CCR1_Val = 146.48 Hz,
so the TIM2 Channel 1 generates an interrupt each 6.8ms
The TIM2 CC2 register is equal to 32768,
CC2 update rate = TIM2 counter clock / CCR2_Val = 219.7 HzHz
so the TIM2 Channel 2 generates an interrupt each 4.55ms
The TIM2 CC3 register is equal to 16384,
CC3 update rate = TIM2 counter clock / CCR3_Val = 439.4Hz
so the TIM2 Channel 3 generates an interrupt each 2.27ms
The TIM2 CC4 register is equal to 8192,
CC4 update rate = TIM2 counter clock / CCR4_Val = 878.9 Hz
so the TIM2 Channel 4 generates an interrupt each 1.13ms.
When the counter value reaches the Output compare registers values, the Output
Compare interrupts are generated and, in the handler routine, 4 pins(PC.04- PC.07,
) are toggled with the following frequencies:
- PC.04: 73.24Hz (CC1)
- PC.05: 109.8Hz (CC2)
- PC.06: 219.7Hz (CC3)
- PC.07: 439.4Hz (CC4)
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
vu16 CCR1_Val = 49152;
vu16 CCR2_Val = 32768;
vu16 CCR3_Val = 16384;
vu16 CCR4_Val = 8192;
ErrorStatus HSEStartUpStatus;
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : main
* Description : Main program
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
debug();
#endif
/* System Clocks Configuration */
RCC_Configuration();
/* NVIC Configuration */
NVIC_Configuration();
/* GPIO Configuration */
GPIO_Configuration();
/* ---------------------------------------------------------------
TIM2 Configuration: Output Compare Timing Mode:
TIM2CLK = 36 MHz, Prescaler = 4, TIM2 counter clock = 7.2 MHz
CC1 update rate = TIM2 counter clock / CCR1_Val = 146.48 Hz
CC2 update rate = TIM2 counter clock / CCR2_Val = 219.7 Hz
CC3 update rate = TIM2 counter clock / CCR3_Val = 439.4 Hz
CC4 update rate = TIM2 counter clock / CCR4_Val = 878.9 Hz
--------------------------------------------------------------- */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 65535;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
/* Prescaler configuration */
TIM_PrescalerConfig(TIM2, 4, TIM_PSCReloadMode_Immediate);
/* Output Compare Timing Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
TIM_OCInitStructure.TIM_Channel = TIM_Channel_1;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInit(TIM2, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable);
/* Output Compare Timing Mode configuration: Channel2 */
TIM_OCInitStructure.TIM_Channel = TIM_Channel_2;
TIM_OCInitStructure.TIM_Pulse = CCR2_Val;
TIM_OCInit(TIM2, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Disable);
/* Output Compare Timing Mode configuration: Channel3 */
TIM_OCInitStructure.TIM_Channel = TIM_Channel_3;
TIM_OCInitStructure.TIM_Pulse = CCR3_Val;
TIM_OCInit(TIM2, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Disable);
/* Output Compare Timing Mode configuration: Channel4 */
TIM_OCInitStructure.TIM_Channel = TIM_Channel_4;
TIM_OCInitStructure.TIM_Pulse = CCR4_Val;
TIM_OCInit(TIM2, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Disable);
/* TIM IT enable */
TIM_ITConfig(TIM2, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4, ENABLE);
/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);
while (1);
}
/*******************************************************************************
* Function Name : RCC_Configuration
* Description : Configures the different system clocks.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
/* RCC system reset(for debug purpose) */
RCC_DeInit();
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK/4 */
RCC_PCLK1Config(RCC_HCLK_Div4);
/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
/* Enable PLL */
RCC_PLLCmd(ENABLE);
/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
/* TIM2 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/* GPIOC clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
}
/*******************************************************************************
* Function Name : GPIO_Configuration
* Description : Configure the GPIOD Pins.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* GPIOC Configuration:Pin 4 - 7 in Output */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
/*******************************************************************************
* Function Name : NVIC_Configuration
* Description : Configure the nested vectored interrupt controller.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
/* Enable the TIM2 gloabal Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
#ifdef DEBUG
/*******************************************************************************
* Function Name : assert_failed
* Description : Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* Input : - file: pointer to the source file name
* - line: assert_param error line source number
* Output : None
* Return : None
*******************************************************************************/
void assert_failed(u8* file, u32 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) */
while (1)
{
}
}
#endif
在stm32f10x_it.c 中 ，设置中断如下 ：
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);
/* Pin PC.04 toggling with frequency = 73.24 Hz */ //翻转
GPIO_WriteBit(GPIOC, GPIO_Pin_4, (BitAction)(1-GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_4)));
capture = TIM_GetCapture1(TIM2);//获得TIM2输入捕获1的值
TIM_SetCompare1(TIM2, capture + CCR1_Val);//设置TIM2捕获比较1寄存器值
}
else if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_CC2);
/* Pin PC.05 toggling with frequency = 109.8 Hz */ //翻转
GPIO_WriteBit(GPIOC, GPIO_Pin_5, (BitAction)(1-GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_5)));
capture = TIM_GetCapture2(TIM2);
TIM_SetCompare2(TIM2, capture + CCR2_Val);
}
else if (TIM_GetITStatus(TIM2, TIM_IT_CC3) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_CC3);
/* Pin PC.06 toggling with frequency = 219.7 Hz */ //翻转
GPIO_WriteBit(GPIOC, GPIO_Pin_6, (BitAction)(1-GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_6)));
capture = TIM_GetCapture3(TIM2);
TIM_SetCompare3(TIM2, capture + CCR3_Val);
}
else
{
TIM_ClearITPendingBit(TIM2, TIM_IT_CC4);
/* Pin PC.07 toggling with frequency = 439.4 Hz */ //翻转
GPIO_WriteBit(GPIOC, GPIO_Pin_7, (BitAction)(1-GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_7)));
capture = TIM_GetCapture4(TIM2);
TIM_SetCompare4(TIM2, capture + CCR4_Val);
}
}
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