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- 2019-7-8
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发表于 2019-7-13 21:19:04
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#include "spwm.h"
#include "stm32f10x.h"
uint16_t spwm[100] = {
0x4000,0x4405,0x4805,0x4BFE,0x4FEA,0x53C7,0x578F,0x5B40,0x5ED5,0x624A,
0x659E,0x68CB,0x6BCF,0x6EA7,0x714F,0x73C6,0x7609,0x7815,0x79E8,0x7B81,
0x7CDD,0x7DFC,0x7EDD,0x7F7E,0x7FDF,0x7FFF,0x7FDF,0x7F7E,0x7EDD,0x7DFC,
0x7CDD,0x7B81,0x79E8,0x7815,0x7609,0x73C6,0x714F,0x6EA7,0x6BCF,0x68CB,
0x659E,0x624A,0x5ED5,0x5B40,0x578F,0x53C7,0x4FEA,0x4BFE,0x4805,0x4405,
0x4000,0x3BFB,0x37FB,0x3402,0x3016,0x2C39,0x2871,0x24C0,0x212B,0x1DB6,
0x1A62,0x1735,0x1431,0x1159,0x0EB1,0x0C3A,0x09F7,0x07EB,0x0618,0x047F,
0x0323,0x0204,0x0123,0x0082,0x0021,0x0001,0x0021,0x0082,0x0123,0x0204,
0x0323,0x047F,0x0618,0x07EB,0x09F7,0x0C3A,0x0EB1,0x1159,0x1431,0x1735,
0x1A62,0x1DB6,0x212B,0x24C0,0x2871,0x2C39,0x3016,0x3402,0x37FB,0x3BFB,
};//这里采样点为1个全波100采样点，精度为15，则数值大小为0-32767(2^15)
static u16 i = 0; //表示正弦波取样点
u16 TimerPeriod = 0; //自动重装载值
u16 Channel1Pulse = 0;
u16 Channel2Pulse = 0;
/*****************************************************************
* 功能： 定时器1产生2路互补的PWM波(频率 = pfreq / (psc+1))
* 说明: channel2, channel3 --> PA.9, PA.10
* channel2N, channel3N --> PB.14, PB.15 (互补通道)
* TimerPeriod --> 自动重装载周期值
* ChannelxPulse --> 占空周期值
*****************************************************************/
void TIM1_PWM_Init(u16 pfreq ,u16 psc) //pfreq为不分频时的PWM频率，psc为预分频值
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure; //输出通道配置
TIM_BDTRInitTypeDef TIM_BDTRInitStructure; //死区和刹车配置
TimerPeriod = (SystemCoreClock / pfreq) - 1; //自动重装载周期值
/* ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100 */
Channel1Pulse = (u16)((u32)(50 * (TimerPeriod - 1)) / 100 ); //占空比50%
Channel2Pulse = (u16)((u32)(50 * (TimerPeriod - 1)) / 100 ); //占空比50%
/* 使能TIM1，GPIOA，GPIOB*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);
/*channel1 ,channel2 --> PA.9, PA.10*
*channel1N,channel2N --> PB.14, PB.15*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
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_14 | GPIO_Pin_15;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* 初始化TIM1 */
TIM_TimeBaseStructure.TIM_Period = TimerPeriod; //设置重装载周期值
TIM_TimeBaseStructure.TIM_Prescaler = psc; //设置预分频值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //时钟分频因子，仅与输入捕获有关（定时器与滤波器的频率比）
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned1;//TIM_CounterMode_Up; TIM向上计数模式 计数器交替地向上和向下计数。输出比较中断标志位，只在计数器向下计数时被设置
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; //重复溢出中断
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //初始化定时器基本配置
/* Channel_2 TIM_OCMode_PWM1模式 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;//TIM_OCMode_PWM1; //在向上计数时，一旦TIMx_CNT<TIMx_CCR1时通道1为有效电平 在向上计数时，一旦TIMx_CNT<TIMx_CCR1时通道1为无效电平，否则为
//有效电平；在向下计数时，一旦TIMx_CNT>TIMx_CCR1时通道1为有效电平，否则为无效电平。
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; //PWM互补输出使能
TIM_OCInitStructure.TIM_Pulse = Channel1Pulse; //占空比 = TIM_Pulse/TIM_Period;设置了待装入捕获比较寄存器的脉冲值。它的取值必须在 0x0000 和 0xFFFF 之间。
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //有效电平为高电平
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; //互补通道电平与普通通道电平相反
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; //输出空闲状态
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset; //PWM互补输出空闲状态
TIM_OC2Init(TIM1, &TIM_OCInitStructure); //根据指定的参数初始化外设TIM1 OC1
/* Channel_3 TIM_OCMode_PWM1模式 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;//TIM_OCMode_PWM1; //在向上计数时，一旦TIMx_CNT>TIMx_CCR1时通道1为有效电平
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; //PWM互补输出使能
TIM_OCInitStructure.TIM_Pulse = Channel2Pulse; //占空比 = TIM_Pulse/TIM_Period;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //有效电平为高电平TIM_OCPolarity_Low
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; //互补通道电平与普通通道电平相反
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; //输出空闲状态 如果实现了OC1N，则死区后OC1=1。
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset; //PWM互补输出空闲状态 0：当MOE=0时，死区后OC1N=0；
TIM_OC3Init(TIM1, &TIM_OCInitStructure); //根据指定的参数初始化外设TIM1 OC2
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable); //使能TIM3在CCR1上的预装载寄存器
TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable); //使能TIM3在CCR2上的预装载寄存器
/*死区和刹车功能配置*/
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 = 0x2F; //设置TIM1_BDTR的DTG[7:0]
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High; //刹车输入高电平有效
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
TIM_Cmd(TIM1, ENABLE); //使能TIM1
TIM_CtrlPWMOutputs(TIM1,ENABLE); //PWM输出使能(输出PWM的这句一定要加)
}
/**************************************************
* 名称：利用定时器2产生中断改变SPWM波的占空比
***************************************************/
void TIM2_Int_Init(u16 ifreq,u16 psc) //ifreq为不分频时的更新中断频率，psc为预分频值
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //时钟使能
TimerPeriod = (SystemCoreClock / ifreq) - 1;
TIM_TimeBaseStructure.TIM_Period = 2*TimerPeriod; //设置自动重装载寄存器周期值
TIM_TimeBaseStructure.TIM_Prescaler = psc; //设置预分频值 10Khz的计数频率
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分频系数
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE ); //使能指定的TIM2中断,允许更新中断（计数器溢出或软件初始化时）
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //TIM2中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; //主优先级3级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 4; //从优先级4级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
TIM_Cmd(TIM2, ENABLE); //使能TIM2
}
//定时器2中断服务程序
void TIM2_IRQHandler(void)
{
extern float Period_percent;
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) //检查TIM2更新中断发生与否
{
TIM_SetCompare2(TIM1,(u16)(Period_percent*spwm[i])) ; //修改TIM1通道1的PWM占空比，后者为捕获/比较寄存器1的值
TIM_SetCompare3(TIM1,(u16)(Period_percent*spwm[i++])); //修改TIM1通道2的PWM占空比，后者为捕获/比较寄存器2的值
if(i == 100) //一周期采样100个点
{
i = 0;
}
TIM_ClearITPendingBit(TIM2, TIM_IT_Update); //清除TIM2更新中断标志
}
}
main.c:
#include "delay.h"
#include "sys.h"
#include "SPWM.h"
#include "led.h"
vu16 freq = 10000, Period = 0; //PWM与定时器中断频率；自动重装载值
__IO float Period_percent; //PWM占空比变化因子，用于修改脉宽
int main(void)
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置系统中断优先级分组2
delay_init();
Period_percent = ((SystemCoreClock / freq) - 1) / 32767.0;
LED_Init();
TIM1_PWM_Init(10000,0); //输出PWM的频率为10KHz(一周期100个点，正弦波的频率为10000/2/100=50Hz)
TIM2_Int_Init(10000,0); //定时器中断的频率为10KHz
while(1)
{
LED1=0;
}
}
看了楼主的程序后，我感觉我对TIM_OCIdleState和TIM_OCNIdleState这些还未考虑，不过先马克一下，以后再说
最后说明一下，TIM2计时到时，即TIM1先增后减计数发生下溢时更新CCRx，至于第二次捕获更新我就先不管了 ，目前以我的水平还看不出来增加一个第二次捕获会有什么改进
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发表于 2017-5-29 15:08:36
楼主
WMÂö3å2¨DÎ
