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50黑幣
做了一個(gè)用STM32F103RBT6芯片控制可控硅加熱的實(shí)驗(yàn)，用內(nèi)部時(shí)鐘CK_INT可以在TIM2_CH2/CH3/CH4上產(chǎn)生三路10ms脈寬PWM。因?yàn)橥獠侩娫搭l率有波動(dòng)所以這幾路PWM無法與電源過零信號(hào)同步控制可控硅。所以才用外部交流電源10ms周期的過零信號(hào)作為定時(shí)器的外部時(shí)鐘接入PA0_ETR管腳，這樣PWM周期就與外部交流電周期嚴(yán)格同步了。實(shí)際程序運(yùn)行后TIM2_CH2/CH3/CH4上并沒有產(chǎn)生10ms脈寬的PWM，不知道到底問題在那兒，請(qǐng)求哪位大俠幫忙看下。（外部中斷是10ms的交流過零信號(hào)）
以下是源代碼：
#include "sys.h"
#include "delay.h"
vu16 led0pwmval=0;
void GPIOInit() //一共10個(gè)PWM端口，初始化GPIOA與GPIOB端口
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOA, ENABLE); //開啟端口時(shí)鐘
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
//初始化定時(shí)器TIM1、TIM2、TIM3比較輸出PWM管腳
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_6|GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10;// GPIOA端口
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO口速度為50MHz
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_0|GPIO_Pin_1;// GPIOB端口
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO口速度為50MHz
GPIO_Init(GPIOB, &GPIO_InitStructure);
//初始化外部中斷管腳
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_15; // GPIOB_Pin15中斷輸入端口
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //PB15設(shè)置成上拉輸入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO口速度為50MHz
GPIO_Init(GPIOB, &GPIO_InitStructure);
//初始化外部時(shí)鐘管腳
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_0; // GPIOA_Pin0外部時(shí)鐘輸入端口
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //PA0設(shè)置成浮空輸入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO口速度為50MHz
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void TIM2_CH1_Clock_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //使能定時(shí)器2時(shí)鐘
//GPIOA_Pin0的ETR外部時(shí)鐘模式2配置
TIM_ETRClockMode2Config(TIM2,TIM_ExtTRGPSC_OFF,TIM_ExtTRGPolarity_NonInverted,0x0f); //外部時(shí)鐘配置：TIM2配置成 1）外部觸發(fā)不預(yù)分頻。2）外部觸發(fā)極性上升沿有效。3）外部觸發(fā)濾波器關(guān)閉
//初始化TIM2
TIM_TimeBaseStructure.TIM_Period = 1; //設(shè)置在下一個(gè)更新事件裝入活動(dòng)的自動(dòng)重裝載寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler = 1-1; //設(shè)置用來作為TIMx時(shí)鐘頻率除數(shù)的預(yù)分頻值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設(shè)置時(shí)鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計(jì)數(shù)模式
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; //重復(fù)計(jì)數(shù)。重復(fù)溢出多少次來一個(gè)溢出中斷
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //根據(jù)TIM_TimeBaseInitStruct中指定的參數(shù)初始化TIMx的時(shí)間基數(shù)單位
TIM_ClearFlag(TIM2, TIM_FLAG_Update);
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
//初始化TIM2_CH2 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //選擇定時(shí)器模式:TIM脈沖寬度調(diào)制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比較輸出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //輸出極性:TIM輸出比較極性高
TIM_OC2Init(TIM2, &TIM_OCInitStructure); //根據(jù)T指定的參數(shù)初始化外設(shè)TIM2 OC2
//初始化TIM2_CH3 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //選擇定時(shí)器模式:TIM脈沖寬度調(diào)制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比較輸出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //輸出極性:TIM輸出比較極性高
TIM_OC3Init(TIM2, &TIM_OCInitStructure); //根據(jù)T指定的參數(shù)初始化外設(shè)TIM2 OC3
//初始化TIM2_CH4 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //選擇定時(shí)器模式:TIM脈沖寬度調(diào)制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比較輸出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //輸出極性:TIM輸出比較極性高
TIM_OC4Init(TIM2, &TIM_OCInitStructure); //根據(jù)T指定的參數(shù)初始化外設(shè)TIM2 OC4
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable); //使能TIM2在CCR2上的預(yù)裝載寄存器
TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable); //使能TIM2在CCR3上的預(yù)裝載寄存器
TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable); //使能TIM2在CCR4上的預(yù)裝載寄存器
TIM_ARRPreloadConfig(TIM2,ENABLE); //立即生效，使能預(yù)裝載寄存器
}
void EXTIX_Init(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //使能復(fù)用功能時(shí)鐘
//GPIOB.6 中斷線以及中斷初始化配置 上升沿觸發(fā)
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource6);
EXTI_InitStructure.EXTI_Line=EXTI_Line6;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //上升沿觸發(fā)
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure); //根據(jù)EXTI_InitStruct中指定的參數(shù)初始化外設(shè)EXTI寄存器
//中斷優(yōu)先級(jí)配置
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn; //使能PB6所在的外部中斷通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02; //搶占優(yōu)先級(jí)2
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00; //子優(yōu)先級(jí)0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能外部中斷通道
NVIC_Init(&NVIC_InitStructure); //根據(jù)NVIC_InitStruct中指定的參數(shù)初始化外設(shè)NVIC寄存器
}
//外部GPIOB_Pin_6中斷服務(wù)程序
void EXTI9_5_IRQHandler(void)
{
EXTI_ClearITPendingBit(EXTI_Line6); //清除LINE6上的中斷標(biāo)志位
TIM_Cmd(TIM2,ENABLE);
TIM_SetCompare2(TIM2,led0pwmval);
TIM_SetCompare3(TIM2,led0pwmval);
TIM_SetCompare4(TIM2,led0pwmval);
}
int main(void)
{
u8 dir=1;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//設(shè)置中斷優(yōu)先級(jí)分組為組2：2位搶占優(yōu)先級(jí)，2位響應(yīng)優(yōu)先級(jí)
GPIOInit();
TIM_DeInit(TIM2);
EXTIX_Init();
TIM2_CH1_Clock_Init();
while(1)
{
delay_us(100);
if(dir)led0pwmval++;
else led0pwmval--;
if(led0pwmval>35000)dir=0;
if(led0pwmval==0)dir=1;
}
}
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