ozone_cp/APP/pwm.c

#include "pwm.h"

#include "board.h"
#define CLCK 48
uint32_t target_frequencyhz;
uint32_t target_duty;

static double calculate_top(double target_frequency_hz) {
  int clck = 0;
  int top = 0;
  clck = CLCK * 1000 * 1000;
  top = clck / target_frequency_hz;
  return top;
}

void t16_pa4_init(void) {
  T16Nx_Disable(T16N0);
  // PA4 T16N0_1
  T16Nx_BaseInitStruType x;
  T16Nx_PWMInitStruType y;
  /* 初始化T16Nx定时器*/
  x.T16Nx_ClkS = T16Nx_ClkS_PCLK;  //时钟源48M
  x.T16Nx_SYNC = Disable;          //不同步
  x.T16Nx_EDGE = T16Nx_EDGE_Rise;  //上升沿触发
  x.T16Nx_Mode = T16Nx_Mode_PWM;   // 选用PWM模式
  x.T16Nx_PREMAT = 0x01;           /* 预分频比1:1 */
  T16Nx_BaseInit(T16N0, &x);
  /* 配置T16N0通道1输出 */
  y.T16Nx_MOE0 = Disable;
  y.T16Nx_MOE1 = Enable;
  y.T16Nx_POL0 = POSITIVE;  //在串口发送的时候，正极性代表发送的数据与接受的数据相同，负极性代表与发送的数据相反，在这么不知道有没有作用
  y.T16Nx_POL1 = POSITIVE;
  y.T16Nx_PWMMODE = T16Nx_PWMMode_INDEP;  //选择独立模式
  y.PWMDZE = Disable;                     // PWM互补模式死区使能
  y.REGBUFEN = Enable;                    //缓冲寄存器使能 (REGBUFEN目前不知道干什么用的)
  T16Nx_PMWOutInit(T16N0, &y);
  /* 配置T16N0 通道1输出 */
  /*MAT2 MAT3 通道的中断配置*/
  //匹配寄存器值匹配后的工作模式，计数到以后： 继续计数不产生中断
  T16Nx_MAT2ITConfig(T16N0, T16Nx_Go_No);
  //匹配寄存器值匹配后的工作模式,清零并重新计数，产生中断
  T16Nx_MAT3ITConfig(T16N0, T16Nx_Clr_Int);

  /*MAT2 MAT3 匹配后的输出电平高低*/
  T16Nx_MAT2Out1Config(T16N0,
                       T16Nx_Out_Low);  //匹配后输出端口的模式，输出高还是低
  T16Nx_MAT3Out1Config(T16N0,
                       T16Nx_Out_High);  //匹配后输出端口的模式，输出高还是低
  //以上是设置模式，输出高低电平
  T16Nx_SetCNT1(T16N0, 0);  //设定计数器的初始值
  T16Nx_SetMAT2(T16N0, 0);  //设置匹配寄存器的数值
  T16Nx_SetMAT3(T16N0, 0);  //设置匹配寄存器的数值
  //设置计数器峰值//根据这个得到定时的时钟48M/48000=1khZ(在独立模式下PWM的周期由TOP1决定为TOP+1，周期算出来是1ms)
  T16Nx_SetTOP1(T16N0, 0);
  //以上是设置占空比
  /* 配置输出管脚 */
  GPIO_InitSettingType initset;

  initset.Signal = GPIO_Pin_Signal_Digital;  //数字
  initset.Dir = GPIO_Direction_Output;       //输出模式
  initset.Func = GPIO_Reuse_Func2;           //复用到T16N0_1功能
  initset.ODE = GPIO_ODE_Output_Disable;     //开漏使能
  initset.DS = GPIO_DS_Output_Normal;        //普通电流模式
  initset.PUE = GPIO_PUE_Input_Enable;       //弱上拉使能
  initset.PDE = GPIO_PDE_Input_Disable;      //弱下拉禁止
  /* 配置PA4为T16N0输出通道1 */
  GPIO_Init(GPIO_Pin_A4, &initset);
  T16Nx_Enable(T16N0);
  return;
}

void set_pwm_t16_pa4(uint32_t freqhz, double duty) {
  double top_double = calculate_top(freqhz);  //根据需要的频率计算出TOP（自动重装载值）
  uint16_t top = (uint16_t)top_double;
  uint16_t Mat2 = (uint16_t)top_double * (duty / 100.0);
  uint16_t Mat3 = top;
  if (Mat2 >= top) Mat2 = top - 1;
  // printf("Mat2:%d\r\n", Mat2);
  // printf("Mat3:%d\r\n", Mat3);
  // printf("top:%d\r\n", top);
  T16Nx_SetCNT1(T16N0, 0);     //设定计数器的初始值
  T16Nx_SetMAT2(T16N0, Mat2);  //设置匹配寄存器的数值
  T16Nx_SetMAT3(T16N0, Mat3);  //设置匹配寄存器的数值
  //设置计数器峰值//根据这个得到定时的时钟48M/48000=1khZ(在独立模式下PWM的周期由TOP1决定为TOP+1，周期算出来是1ms)
  T16Nx_SetTOP1(T16N0, top);
  //以上是设置占空比
}

//######################################################
/**
 * @brief 设置pwm的周期占空比
 *
 * @param frequency
 * @param duty
 */

/**
 *
 * 频率变化:
 *
 *
 *
 * 占空比变化:
 *  20->0
 *  0->20
 *  0->10
 *
 *  有效时间逐渐增加，周期最大,有效时间不变，周期变小，频率变大
 *
 *
 *
 *  周期变大，有效时间不变，周期变到最大，有效时间逐渐减小
 *
 *
 * 1. 先变化到周期,如果周期时间大于占空比，则先变化到占空比
 * 2. 再变化频率
 *
 */

uint32_t s_target_frequencyhz;
uint32_t s_now_frequencyhz;

uint32_t s_target_duty;
uint32_t s_now_duty;

/**
 * @brief
 *
 * @param freq
 * @param us
 */

// static uint32_t get_duty_by_freq_and_valid_time(uint32_t freq, uint32_t us) {
//   uint32_t period = 1000000 / freq;
//   uint32_t duty = us * 100 / period;
//   return duty;
// }
// static uint32_t get_pwm_pulse_width_us_by_duty(uint32_t freq, uint32_t duty) {
//   uint32_t period = 1000000 / freq;
//   uint32_t pwm_pulse_width_us = period * duty / 100;
//   return pwm_pulse_width_us;
// }

double get_duty(double now_duty, double target_duty, double increment_count) {
  if (now_duty > target_duty) {
    now_duty -= (now_duty - target_duty) / increment_count;  //(now_duty-target_duty)/increment_count每次的增量
  } else if (now_duty < target_duty) {
    now_duty += (target_duty - now_duty) / increment_count;
  }
  return now_duty;
}
void set_pwm_modbul_freq_duty(uint32_t frequencyhz, uint32_t duty) {
  static uint32_t now_frequencyhz;
  static double now_duty;
  static uint32_t pwm_pulse_width_us;
  uint32_t increment_conut;  //从现在的频率到目标频率每次增加PWM_CHANGE_STEP_FREQ，还需要增加多少次
  target_frequencyhz = frequencyhz;
  target_duty = duty;
  if (now_frequencyhz == target_frequencyhz) {
    if (now_duty != target_duty) {
      now_duty = target_duty;
      set_pwm_t16_pa4(now_frequencyhz, now_duty);
    }
    if ((uint32_t)now_duty == target_duty) {
      return;
    }
  }
  // pwm_pulse_width_us = get_pwm_pulse_width_us_by_duty(target_frequencyhz, target_duty);
  if (now_frequencyhz < target_frequencyhz) {
    now_frequencyhz = now_frequencyhz + PWM_CHANGE_STEP_FREQ;
    if (now_frequencyhz >= target_frequencyhz) {
      now_frequencyhz = target_frequencyhz;
    }
    increment_conut = (target_frequencyhz - now_frequencyhz) / PWM_CHANGE_STEP_FREQ;
    // now_duty = get_duty_by_freq_and_valid_time(now_frequencyhz, pwm_pulse_width_us);
    now_duty = get_duty(now_duty, target_duty, increment_conut);
    set_pwm_t16_pa4(now_frequencyhz, now_duty);
    printf("%d,%lf\r\n", now_frequencyhz, now_duty);
  } else if (now_frequencyhz > target_frequencyhz) {
    now_frequencyhz = now_frequencyhz - PWM_CHANGE_STEP_FREQ;
    if (now_frequencyhz <= target_frequencyhz) {
      now_frequencyhz = target_frequencyhz;
    }
    // now_duty = get_duty_by_freq_and_valid_time(now_frequencyhz, pwm_pulse_width_us);
    increment_conut = (now_frequencyhz - target_frequencyhz) / PWM_CHANGE_STEP_FREQ;
    now_duty = get_duty(now_duty, target_duty, increment_conut);
    set_pwm_t16_pa4(now_frequencyhz, now_duty);
    printf("%d,%lf\r\n", now_frequencyhz, now_duty);
  }
}


// uint32_t get_next_value_on_step(uint32_t now, uint32_t target, uint32_t step) {

// }

// void pwm_module_stop() { set_pwm_modbul_freq_duty(MIN_PWM_FREQ, 0); }
// void pwm_schdule() {
//   /**
//    * @brief 当前频率的占空比的百分之一变化
//    */
//   //计算当前频率下的目标占空比
//   uint32_t targetduty = 0;
//   uint32_t targetduty1 = s_target_duty;
//   uint32_t targetduty2 = (1.0 / s_target_frequencyhz) * (s_target_duty / 100.0) / (1.0 / s_now_frequencyhz) * 100;
//   targetduty = targetduty1 < targetduty2 ? targetduty1 : targetduty2;

//   if (targetduty != s_now_duty) {
//     set_pwm_t16_pa4(s_now_frequencyhz, targetduty);
//     return;
//   } else {
//     //计算下一次设置的频率

//     set_pwm_t16_pa4(s_now_frequencyhz, targetduty);
//   }

//   if (s_target_frequencyhz > s_now_frequencyhz) {
//     s_now_frequencyhz += 1000;
//   }
// }
//######################################################
//# c语言的理解
//# static , 字节长度 ，堆，栈，变量分布，
//# 操作系统
//# 线程，进程，信号量
//#
//#