STM32高級定時器-PWM簡單學習案例
高級定時器與通用定時器比較類似,下面是一個TIM1 的PWM 程序,TIM1是STM32唯一的高級定時器。共有4個通道有死區(qū)有互補。
本文引用地址:http://www.ex-cimer.com/article/201710/365449.htm先是配置IO腳:
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, GPIO_InitStructure);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
void Tim1_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_DeInit(TIM1); //重設為缺省值
TIM_TimeBaseStructure.TIM_Prescaler = 4000; //預分頻(時鐘分頻)72M/4000=18K
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上計數
TIM_TimeBaseStructure.TIM_Period = 144; //裝載值 18k/144=125hz 就是說向上加的144便滿了
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //設置了時鐘分割 不懂得不管
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0; //周期計數器值 不懂得不管
TIM_TimeBaseInit(TIM1,TIM_TimeBaseStructure); //初始化TIMx的時間基數單位
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //PWM模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //正向通道有效 PA8
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; //反向通道也有效 PB13
TIM_OCInitStructure.TIM_Pulse = 40; //占空時間 144 中有40的時間為高,互補的輸出正好相反
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //輸出極性
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; //互補端的極性
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; //空閑狀態(tài)下的非工作狀態(tài)不管
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; //先不管
TIM_OC1Init(TIM1,TIM_OCInitStructure); //數初始化外設TIMx通道1這里2.0庫為TIM_OCInit
TIM_Cmd(TIM1,ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);
}
//設置捕獲寄存器1
void SetT1Pwm1(u16 pulse)
{
TIM1-》CCR1=pulse;
}
//在MAIN 中加點鍵盤掃描啥的用來改變占空比
#include “STM32Lib\stm32f10x.h”
#include “hal.h”
extern void SetT1Pwm1(u16 pulse);
int main(void)
{
u16 pulse=40;
ChipHalInit(); //片內硬件初始化
ChipOutHalInit(); //片外硬件初始化
for(;;)
{
if(GET_UP())
{
while(GET_UP());
if(pulse《=144)
{
pulse+=5;
SetT1Pwm1(pulse);
}
}
if(GET_DOWN())
{
while(GET_DOWN());
if(pulse》30)
{
pulse-=5;
SetT1Pwm1(pulse);
}
}
}
}
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