/************************************************************
Copyright (C), 2012-2022, yin.
FileName: main.c
Author: ycw Version : 1.0 Date: 2012.04.25
Description: TIM1 PWM NVIC
Version: V1.0
Function List: TIM1 PWM NVIC
History:

YCW 12/04/25 1.0 build this moudle
***********************************************************/

#include

static __IO uint32_t TimingDelay;//__IO為volatile的宏定義
int8_t LED_Flag = 1;//LED燈翻轉(zhuǎn)標(biāo)志位

void GPIO_Config(void);
void TIM_Config(void);
void NVIC_Config(void);
void Delay(__IO uint32_t nTime);

main ()
{
/*在主函數(shù)main之前通過(guò)調(diào)用啟動(dòng)代碼運(yùn)行了SystemInit函數(shù)，而
這個(gè)函數(shù)位于system_stm32f4xx.c”。程序運(yùn)行起始于啟動(dòng)文件的第
175行（LDR R0, =SystemInit）。sys時(shí)鐘為HSE頻率/PLL_M*PLL_N/PLL_P，
定義HSE為25M，則sys時(shí)鐘頻率為168M */

GPIO_Config();
TIM_Config();
NVIC_Config();
/*SystemCoreClock / 1000時(shí)基為1ms*/
if (SysTick_Config(SystemCoreClock / 1000))
{
/* Capture error */
while (1);
}
while (1)
{
/*產(chǎn)生一個(gè)軟件中斷
TIM_GenerateEvent(TIM1,TIM1_UP_TIM10_IRQn);
Delay(1000);
*/
if (LED_Flag != 1)
{
GPIO_SetBits(GPIOG, GPIO_Pin_6); //setbits使能IO，當(dāng)前下指輸出（此時(shí)為滅）
}
else
{
GPIO_ResetBits(GPIOG, GPIO_Pin_6); //Resetbits屏蔽IO，當(dāng)前下指不輸出（此時(shí)為亮）
}
}
}

/*************************************************
Function: void GPIO_Config(void)
Description: GPIO配置函數(shù)
Input: 無(wú)
Output:無(wú)
Return:無(wú)
*************************************************/
void GPIO_Config(void)
{
/*定義了一個(gè)GPIO_InitStructure的結(jié)構(gòu)體，方便一下使用 */
GPIO_InitTypeDef GPIO_InitStructure;
/* 使能GPIOG時(shí)鐘（時(shí)鐘結(jié)構(gòu)參見(jiàn)“stm32圖解.pdf”）*/
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOG | RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB, ENABLE);
/*僅設(shè)置結(jié)構(gòu)體中的部分成員：這種情況下，用戶應(yīng)當(dāng)首先調(diào)用函數(shù)PPP_SturcInit(..)
來(lái)初始化變量PPP_InitStructure，然后再修改其中需要修改的成員。這樣可以保證其他
成員的值（多為缺省值）被正確填入。
*/
GPIO_StructInit(&GPIO_InitStructure);
/* 初始化GPIOG的Pin_6為推挽輸出*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //指定第六引腳
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; //模式為輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //頻率為快速
GPIO_Init(GPIOG, &GPIO_InitStructure); //調(diào)用IO初始化函數(shù)

/*配置GPIOA_Pin_8，作為TIM1_Channel2 PWM輸出*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_10 | GPIO_Pin_11; //指定復(fù)用引腳
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //模式必須為復(fù)用！
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //頻率為快速
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉與否對(duì)PWM產(chǎn)生無(wú)影響
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13; //GPIOB_Pin13作為TIM1_CH1N輸出
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_TIM1); //復(fù)用GPIOA_Pin7為TIM1_Ch1N，效果不理想高電平不到0.5V
GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_TIM1); //復(fù)用GPIOA_Pin8為TIM1_Ch1,
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_TIM1);//復(fù)用GPIOA_Pin10為TIM1_Ch3,
GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_TIM1);//復(fù)用GPIOA_Pin11為TIM1_Ch4,注意沒(méi)有CH4N
GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_TIM1);//復(fù)用GPIOB_Pin13為TIM1_Ch1N,效果很好，可以和GPIOA_Pin7同時(shí)復(fù)用
}

/*************************************************
Function: void TIM_Config(void)
Description: 定時(shí)器配置函數(shù)
Input: 無(wú)
Output: 無(wú)
*************************************************/
void TIM_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
TIM_DeInit(TIM1);//初始化TIM1寄存器

/*分頻和周期計(jì)算公式：
Prescaler = (TIMxCLK / TIMx counter clock) - 1;
Period = (TIMx counter clock / TIM3 output clock) - 1
TIMx counter clock為你所需要的TXM的定時(shí)器時(shí)鐘
*/
TIM_TimeBaseStructure.TIM_Period = 10000-1; //查數(shù)據(jù)手冊(cè)可知，TIM1與TIM8為16位自動(dòng)裝載
/*在system_stm32f4xx.c中設(shè)置的APB2 Prescaler = 2 ,可知
*APB1時(shí)鐘為168M/2*2,因?yàn)槿绻鸄PB1分頻不為1，則定時(shí)時(shí)鐘x2
*/
TIM_TimeBaseStructure.TIM_Prescaler = 16800-1; //分頻為10K
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上計(jì)數(shù)
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

/*配置輸出比較，產(chǎn)生占空比為20%的PWM方波*/
TIM_OCStructInit(&TIM_OCInitStructure); //填入缺省值，其中后幾項(xiàng)只對(duì)TIM1和TIM8有效
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //PWM1為正常占空比模式，PWM2為反極性模式
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //輸出允許
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; //互補(bǔ)輸出允許
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //High為占空比高極性，此時(shí)占空比為20%；Low則為反極性，占空比為80%
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;//互補(bǔ)輸出，與以上相反
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;

TIM_OCInitStructure.TIM_Pulse = 2000; //輸入通道1 CCR1（占空比數(shù)值）
TIM_OC1Init(TIM1, &TIM_OCInitStructure); //Ch1初始化
TIM_OCInitStructure.TIM_Pulse = 4000;
TIM_OC3Init(TIM1, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse = 7000;
TIM_OC4Init(TIM1, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);//CCR自動(dòng)裝載默認(rèn)也是打開(kāi)的
TIM_ARRPreloadConfig(TIM1, ENABLE); //ARR自動(dòng)裝載默認(rèn)是打開(kāi)的，可以不設(shè)置

TIM_ClearFlag(TIM1, TIM_FLAG_Update);
TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM1, ENABLE); //使能TIM1定時(shí)器
TIM_CtrlPWMOutputs(TIM1, ENABLE);//使能TIM1的PWM輸出，TIM1與TIM8有效
}

/*************************************************
Function: void NVIC_Config(void)
Description: 嵌套中斷斷配置函數(shù)
Input: 無(wú)
Output: 無(wú)
*************************************************/
void NVIC_Config(void)
{
/*配置定時(shí)器TIM1中斷嵌套*/
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); //中斷優(yōu)先級(jí)分組為1
NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_TIM10_IRQn; //嵌套中斷通道為TIM1
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //搶占優(yōu)先級(jí)為1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //響應(yīng)優(yōu)先級(jí)為0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能中斷
NVIC_Init(&NVIC_InitStructure);
}

/*************************************************
Function: void Delay(__IO uint32_t nTime)
Description: 精確延時(shí)函數(shù)，時(shí)基根據(jù)前面設(shè)定，當(dāng)前
為1ms
Input: 需要延時(shí)的時(shí)間，單位ms
Output:無(wú)
*************************************************/
void Delay(__IO uint32_t nTime)
{
TimingDelay = nTime;
while (TimingDelay != 0);
}

/*************************************************
Function: void TimingDelay_Decrement(void)
Description: SysTick中斷服務(wù)函數(shù)，加在_it.h中的
void SysTick_Handler(void)函數(shù)內(nèi)
Input: 無(wú)
Output:無(wú)
*************************************************/
void TimingDelay_Decrement(void)
{
if (TimingDelay != 0x00)
{
TimingDelay--;
}
}