基于STM32G031開發板的雙通道簡易示波器設計

引言

項目成果概述

本項目使用硬禾課堂STM32G031開發板卡以及STM32CubeIDE開發工具，實現了一個簡易的示波器。示波器的各項參數或功能概述如下：

項目需求分析

核心技術路線

void ADC_init(void){  uint32_t temp;  RCC->IOPENR |= 0X1UL;//打開PortA時鐘  temp=RCC->IOPENR;//時鐘使能需等2個周期  UNUSED(temp);//避免Warning  //由于GPIOA->MODER對應位默認為0X3，即模擬輸入  //因此不需要再額外配置PortA
  RCC->APBENR2 |= (0X1UL<<20UL);//打開ADC1時鐘  temp=RCC->APBENR2;  UNUSED(temp);  ADC1->CR |= (0X1UL<<28UL);//使能內部參考電壓  //自己寫的延時，用TIM17的OPM模式  TIM17_Delay(1000-1,32-1);//等待參考電壓有效  ADC1->CR |= (0X1UL<<31UL);  do  {    temp=ADC1->CR;//開始校正指令  }while(temp & (0X1UL<<31));//等待校正結束  ADC1->CFGR1 |= (0X1UL<<16 | 0X1UL<<12 | 0X2UL<<10 | 0X2UL<<6 | 0X0UL);  //(discontinuous,overwritten,ext rising edge,TRG2,DMA disabled);
  ADC1->TR1 &= ~(0X0FFF0000);  ADC1->TR1 |=  (0X0FFF0800);  //模擬看門狗的高低閾值  ADC1->CFGR1 |= (0X1<<26 | 0X1<<22 | 0X1UL<<23);  //AWD1 configuration  ADC1->CFGR2 |= (0X3UL<<30); //PCLK as ADC_CLK  ADC1->CHSELR |= (0X1UL << 1 | 0X0UL<<7);//選擇通道一  do  {    temp=ADC1->ISR;  }while(!(temp & (0X1UL<<13)));//等待通道配置有效  ADC1->CR |= 0X1UL;//enabling ADC1  do  {    temp = ADC1->ISR;  }while(!(temp & 0X1UL));//ADC Ready  ADC1->CR |= 0X1UL<<2;//ADC Start  return;}

void ADC_DMA_init(void){  uint32_t temp;  RCC->AHBENR |= 0X1UL;  temp=RCC->AHBENR;//時鐘使能需2個周期  UNUSED(temp);//避免Warning  DMA1_Channel1->CPAR = (uint32_t)(ADC1_BASE+0X40);  DMA1_Channel1->CMAR = (uint32_t)(&dat_buf);  DMA1_Channel1->CNDTR = ADC_MAX * 2;  DMA1_Channel1->CCR |= (0X2UL<<12 | 0X1UL<<10 | 0X2UL<<8 | 0X1UL<<7 |       0X0UL<<3 | 0X1UL<<1 | 0X1 << 5);      //v-high priority, m-size=16,p-size=16,m-increase,      //error and complete interrupt, circular mode;  DMAMUX1_Channel0->CCR &= ~(0X7FUL);  DMAMUX1_Channel0->CCR |= (0X1FUL);//tim2 as request source  __NVIC_SetPriority(DMA1_Channel1_IRQn,0);  __NVIC_EnableIRQ(DMA1_Channel1_IRQn);  DMA1_Channel1->CCR |= 0X1UL;//enable DMA channel  return;}

void TIM2_Init(unsigned int priority){  uint32_t temp;  RCC->APBENR1 |= 0X1UL;//使能TIM2時鐘  temp=RCC->APBENR1;  UNUSED(temp);  //TIM2->DIER |= 0X1UL;//允許更新中斷  TIM2->CR1 |= 0X1UL<<2UL;//手動更新不觸發中斷  TIM2->CR2 |= 0X2<<4;//update as TRGO  TIM2->SMCR |= 0X1UL<<7;  TIM2->DIER |= 0X1UL<<8;  TIM2->ARR = 16-1;  TIM2->PSC = 0;  temp=TIM2->ARR;  TIM2->EGR |= 0X1UL;//手動更新寄存器值  temp=TIM2->PSC;  UNUSED(temp);}

if((!(cursor_buf & (0X1 << 7))) || ((cursor_buf & (0X1 << 7)) && (single_flag == 0)))    {      TIM1->ARR = TIM2->ARR;      TIM1->PSC = (TIM2->PSC + 1) * 256 - 1;      TIM1->EGR |= 0X1;      {        DMA1_Channel1->CNDTR = ADC_MAX * 2;        DMA1_Channel1->CCR |= 0X1UL;        TIM1->SR &= ~(0X1UL);        TIM2->CR1 |= 0X1UL;      }
      while(!(dat_buf_ready & 0X01))      {      }      TIM1->DIER |= (0X1UL);      TIM1->SMCR |= (0X0UL<<16 | 0X6UL);      dat_buf_ready &= ~(0X1);    }void TIM1_BRK_UP_TRG_COM_IRQHandler(void){  CH1_CNDTR = DMA1_Channel1->CNDTR;//賦值了不一定用，但這樣最準確  if(TIM1->SR & 0X1UL)  {    {      TIM2->CR1 &= ~(0X1UL);      TIM1->CR1 &= ~(0X1UL);      //Stop tim2 and consequently stop DMA      TIM2->CNT = 0;//resetting TIM2      dat_buf_ready |= 0X1 << 7;//setting complement flag    }    TIM1->SR &= ~(0X1UL);    __NVIC_ClearPendingIRQ(TIM1_BRK_UP_TRG_COM_IRQn);  }}void DMA1_Channel1_IRQHandler(void)//中斷服務函數{  DMA1->IFCR |=0X1UL;  dat_buf_ready |= 0X1;  __NVIC_ClearPendingIRQ(DMA1_Channel1_IRQn);}

if((!(cursor_buf & (0X1 << 7))) || ((cursor_buf & (0X1 << 7)) && (single_flag == 0)))//測量頻率        {       //配置參數        //保存TIM2原參數，并設為2MHz采樣率        arr = TIM2->ARR;        TIM2->ARR = 16 - 1;        smp = (ADC1->SMPR) & 0X7;        ADC1->SMPR &= ~(0X7);        ADC1->SMPR |= 0X1;        psc = TIM2->PSC;        TIM2->PSC = 0;        //將TIM1的從模式更改為External Clock 1        //并打開數字濾波        TIM1->SMCR &= ~((0X1 << 16) | 0X7);        TIM1->SMCR |= 0X7;        TIM1->SMCR |= 0XF << 8;        TIM1->PSC = 0;        TIM1->ARR = 65535;        TIM1->CNT = 0;        TIM1->EGR |= 0X1;
        //配置SysTick        SysTick->VAL = 0;        SysTick->LOAD = 16000000 -1;
        //開啟測量        TIM2->CR1 |= 0X1;        TIM1->CR1 |= 0X1;        SysTick->CTRL |= 0X1;        while(!(SysTick_UE_FLAG & 0X1))        {        }        //結束測量，恢復TIM1參數        TIM1->CR1 &= ~(0X1);        TIM2->CR1 &= ~(0X1);        SysTick_UE_FLAG &= ~(0X1);        TIM1->SMCR &= ~((0X1 << 16) | 0X7);        TIM1->SMCR &= ~(0XF << 8);      }

//macros for register ui_buf#define CH_SEL_BIT_OFFSET (0)#define CH_SEL_BIT (0X1 << CH_SEL_BIT_OFFSET)
#define FFT_ON_BIT_OFFSET (1)#define FFT_ON_BIT (0X1 << FFT_ON_BIT_OFFSET)
#define TRG_POL_BIT_OFFSET (2)#define TRG_POL_BIT (0X1 << TRG_POL_BIT_OFFSET)
#define AUTO_ON_BIT_OFFSET (3)#define AUTO_ON_BIT (0X1 << AUTO_ON_BIT_OFFSET)
#define TIME_BASE_BITS_OFFSET (4)#define TIME_BASE_BITS (0XF << TIME_BASE_BITS_OFFSET)
#define AMP_DIV_BITS_OFFSET (8)#define AMP_DIV_BITS (0XF << AMP_DIV_BITS_OFFSET)
#define NEG_TIME_BITS_OFFSET (12)#define NEG_TIME_BITS (0X7F << NEG_TIME_BITS_OFFSET)
#define TRG_LV_BITS_OFFSET (19)#define TRG_LV_BITS (0X7F << TRG_LV_BITS_OFFSET)
#define BIAS_BITS_OFFSET (26)#define BIAS_BITS (0X3F << BIAS_BITS_OFFSET)

void EXTI4_15_IRQHandler(void){  if(EXTI->FPR1 & (0X1 << 15))  {    flag |= 0X1 << 7;    if(!(GPIOB->IDR & (0X1 << 4)))    {      add_buf ++;      min_buf = 0;    }    else    {      min_buf ++;      add_buf = 0;    }    TIM17_Delay(5000-1,320-1);    EXTI->FPR1 |= 0X1 << 15;  }  if(EXTI->FPR1 & (0X1 << 4))//left key down,--, or switch to main ui  {    TIM17_Delay(5000-1,320-1);    if(!(GPIOA->IDR & (0X1 << 4)))    {    flag |= 0X1;    if(GPIOB->IDR & (0X1 << 3))//PB3 not down    {      if(!(M_S_FLAG & cursor_buf))//main ui      {        if(!(ui_buf & FFT_ON_BIT))        {          if((cursor_buf & M_UI_BITS) > 0)            cursor_buf -= 0X1 << M_UI_BITS_OFFSET;        }        else        {          fft_col |= 0X1 << 7;//變量標志位        }      }      else//sub ui      {        if((cursor_buf & S_UI_BITS) > 0)          cursor_buf -= 0X1 << S_UI_BITS_OFFSET;      }    }    else//PB3 down    {      cursor_buf &= ~(M_S_FLAG);    }    }    EXTI->FPR1 |= 0X1 << 4;  }  if(EXTI->FPR1 & (0X1 << 5))//right key down,++, or switch to sub ui  {    TIM17_Delay(5000-1,320-1);    if(!(GPIOA->IDR & (0X1 << 5)))    {    flag |= 0X1;    if(GPIOB->IDR & (0X1 << 3))//PB3 not down    {      if(!(M_S_FLAG & cursor_buf))//main ui      {        if(!(ui_buf & FFT_ON_BIT))        {          if((cursor_buf & M_UI_BITS) < (0X4 << M_UI_BITS_OFFSET))            cursor_buf += 0X1 << M_UI_BITS_OFFSET;        }        else        {          fft_col &= ~(0X1 << 7);        }      }      else//sub ui      {        if((cursor_buf & S_UI_BITS) < (0X4 << S_UI_BITS_OFFSET))          cursor_buf += 0X1 << S_UI_BITS_OFFSET;      }    }    else//PB3 down    {      cursor_buf |= M_S_FLAG;    }    }    EXTI->FPR1 |= 0X1 << 5;  }  __NVIC_ClearPendingIRQ(EXTI4_15_IRQn);}

case (0X1 << M_UI_BITS_OFFSET)://水平分格{  flag |= 0X1 << 2;  if(add_buf && ((ui_buf & TIME_BASE_BITS) < (0XF << TIME_BASE_BITS_OFFSET)))  {    add_buf = 0;    ui_buf += (0X1 << TIME_BASE_BITS_OFFSET);  }  else if(min_buf && ((ui_buf & TIME_BASE_BITS) > (0X1 << TIME_BASE_BITS_OFFSET)))  {    min_buf = 0;    ui_buf -= (0X1 << TIME_BASE_BITS_OFFSET);  }  break;}事實上，這是本項

其他功能簡述

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