//使用高级定时器 1 完成

//Update--2019.6.3

//sin_k =    TIM1_ARR / 200.0 * (float)(spwm_max_duty - spwm_min_duty ) ;    //正弦波的比例系数,一个简单的数学代换

//sin_b = TIM1_ARR / 200.0 * (float)(spwm_max_duty + spwm_min_duty ) ; //正弦波的截距

#include "timer1.h"

#include "led.h"

#include "math.h"

TIM_HandleTypeDef      TIM1_Handler;         //定时器句柄

TIM_OC_InitTypeDef     TIM1_CH1Handler;     //定时器3通道4句柄

TIM_BreakDeadTimeConfigTypeDef BreakDeadTime_Config;

#define PWM_GPIO        GPIOA

#define PWM_PIN1        GPIO_PIN_8　　　　　　

#define PWM_PIN2        GPIO_PIN_7

#define TIM1_ARR        5399

//SPWM波相关计算

//sin_points -- 一个周期内中断计算的正弦点数，20KHz载波，Tc = 50us，基波周期 Tb = 50us * sin_points

//Tb = 20Hz  = 50ms = 50,000us, sin_points = 1000

//Tb = 100Hz = 10ms = 10,000us , sin_points =  200

//(-sin_k + sin_b ) / TIM1_ARR = spwm_min_duty %

//( sin_k + sin_b ) / TIM1_ARR = spwm_max_duty %，反解出 sin_k, sin_b

// sin_k = TIM1_ARR / 200.0 * (float)(spwm_max_duty - spwm_min_duty )

// sin_b = TIM1_ARR / 200.0 * (float)(spwm_max_duty + spwm_min_duty )        

uint8_t   spwm_min_duty    =    ;                    //SPWM波最小占空比

uint8_t   spwm_max_duty    =    ;                  //SPWM波最大占空比

uint16_t  count = ;

uint16_t  sin_points =    ;

uint16_t  cc1_value;                                    //比较寄存器 1的值，修改改变占空比

float          sin_k,sin_b;

//TIM1 PWM部分初始化

//PWM输出初始化

//arr：自动重装值

//psc：时钟预分频数

void TIM1_PWM_Init(u16 arr,u16 psc)

{

      //时钟配置

    TIM1_Handler.Instance = TIM1;            //定时器3

    TIM1_Handler.Init.Prescaler = psc;       //定时器分频

    TIM1_Handler.Init.CounterMode=TIM_COUNTERMODE_UP;//向上计数模式

    TIM1_Handler.Init.Period=arr;          //自动重装载值

    TIM1_Handler.Init.ClockDivision=TIM_CLOCKDIVISION_DIV1;

    HAL_TIM_PWM_Init(&TIM1_Handler);       //初始化PWM，会调用HAL_TIM_PWM_Init(*)

      //PWM配置

    TIM1_CH1Handler.OCMode=TIM_OCMODE_PWM1; //模式选择PWM1

    TIM1_CH1Handler.Pulse=arr/;            //设置比较值,此值用来确定占空比，默认比较值为自动重装载值的一半,即占空比为50%

    TIM1_CH1Handler.OCPolarity = TIM_OCPOLARITY_HIGH;//输出比较极性为高

    TIM1_CH1Handler.OCNPolarity = TIM_OCPOLARITY_HIGH;

    TIM1_CH1Handler.OCIdleState = TIM_OCIDLESTATE_SET;

    TIM1_CH1Handler.OCNIdleState = TIM_OCIDLESTATE_SET;

    HAL_TIM_PWM_ConfigChannel(&TIM1_Handler,&TIM1_CH1Handler,TIM_CHANNEL_1);//配置TIM1通道1

     //死区时间配置

     //https://blog.csdn.net/DZRYWYBL/article/details/82527889

    BreakDeadTime_Config.OffStateRunMode = TIM_OSSR_DISABLE;

    BreakDeadTime_Config.OffStateIDLEMode = TIM_OSSI_DISABLE;

    BreakDeadTime_Config.LockLevel = TIM_LOCKLEVEL_OFF;

    BreakDeadTime_Config.DeadTime = 0X00; //0x00~0xFF,当设置为0xFF时，50us周期，约有4.68us死区时间；0x0F约有100ns死区时间

    BreakDeadTime_Config.BreakState = TIM_BREAK_DISABLE;

    BreakDeadTime_Config.BreakPolarity = TIM_BREAKPOLARITY_HIGH;

    BreakDeadTime_Config.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;

    HAL_TIMEx_ConfigBreakDeadTime(&TIM1_Handler, &BreakDeadTime_Config);

     //中断配置

    HAL_NVIC_SetPriority(TIM1_CC_IRQn,,);    //设置中断优先级，抢占优先级1，子优先级3

    HAL_NVIC_EnableIRQ(TIM1_CC_IRQn);          //开启ITM3中断

    //开启PWM并使能中断

    HAL_TIM_PWM_Start_IT(&TIM1_Handler, TIM_CHANNEL_1); //开启PWM输出并使能中断

    HAL_TIMEx_PWMN_Start(&TIM1_Handler, TIM_CHANNEL_1); //打开互补通道

}

//定时器底层驱动，时钟使能，引脚配置

//此函数会被HAL_TIM_PWM_Init()调用

//htim:定时器句柄

void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)

{

    GPIO_InitTypeDef GPIO_Initure;

    __HAL_RCC_TIM1_CLK_ENABLE();            //使能定时器3

    __HAL_RCC_GPIOA_CLK_ENABLE();

    __HAL_RCC_GPIOB_CLK_ENABLE();

    GPIO_Initure.Pin=PWM_PIN1 | PWM_PIN2;   //PWM Pin

    GPIO_Initure.Mode=GPIO_MODE_AF_PP;      //复用推完输出

    GPIO_Initure.Pull=GPIO_PULLUP;          //上拉

    GPIO_Initure.Speed=GPIO_SPEED_HIGH;     //高速

    GPIO_Initure.Alternate=GPIO_AF1_TIM1;   //PA8复用为TIM1_CH1

    HAL_GPIO_Init(PWM_GPIO,&GPIO_Initure); 

}

//设置TIM通道4的占空比

//compare:比较值

void TIM_SetTIM1Compare1(u32 compare)

{

    TIM1->CCR1=compare;

}

//定时器1中断服务函数

void TIM1_CC_IRQHandler(void)    //注意名称与通用计时器不同，多了 CC

{

    HAL_TIM_IRQHandler(&TIM1_Handler);

}

//定时器1中断服务函数调用

void HAL_TIM_OC_DelayElapsedCallback(TIM_HandleTypeDef *htim)

{

    if(htim==(&TIM1_Handler))

    {

          count ++;

          if(count ==  sin_points)

              count = ;

          sin_k =    TIM1_ARR / 200.0 * (float)(spwm_max_duty - spwm_min_duty ) ;    //正弦波的比例系数,一个简单的数学代换//更正为相减

          sin_b = TIM1_ARR / 200.0 * (float)(spwm_max_duty + spwm_min_duty ) ;       //正弦波的截距//更正为相加

          cc1_value = (uint16_t) (sin_k * sin( (double)count * 6.28318 / (double)sin_points) + sin_b);    //正弦值计算，得到SPWM波占空比

          TIM_SetTIM1Compare1(cc1_value);

    }

}

TIM1_PWM_Init(-,-);     //216M / (5400 * 2 ) = 20K