AT32F435/437 ADC过采样

static void gpio_config(void) 

{ 

gpio_init_type gpio_initstructure; 

crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE); 

crm_periph_clock_enable(CRM_GPIOB_PERIPH_CLOCK, TRUE); 

gpio_default_para_init(&gpio_initstructure); 

gpio_initstructure.gpio_mode = GPIO_MODE_ANALOG; 

gpio_initstructure.gpio_pins = GPIO_PINS_0 | GPIO_PINS_1; 

gpio_init(GPIOB, &gpio_initstructure);} 

/* config adc pin as analog input mode */ 

gpio_initstructure.gpio_mode = GPIO_MODE_ANALOG; 

gpio_initstructure.gpio_pins = GPIO_PINS_4 | GPIO_PINS_5 | GPIO_PINS_6 | GPIO_PINS_7; 

gpio_init(GPIOA, &gpio_initstructure);

static void dma_config(void) 

{ 

  dma_init_type dma_init_struct; 

  crm_periph_clock_enable(CRM_DMA1_PERIPH_CLOCK, TRUE); 

  nvic_irq_enable(DMA1_Channel1_IRQn, 0, 0); 

   

  dma_reset(DMA1_CHANNEL1); 

  dma_default_para_init(&dma_init_struct); 

  dma_init_struct.buffer_size = 15; 

  dma_init_struct.direction = DMA_DIR_PERIPHERAL_TO_MEMORY; 

  dma_init_struct.memory_base_addr = (uint32_t)adc1_ordinary_valuetab; 

  dma_init_struct.memory_data_width = DMA_MEMORY_DATA_WIDTH_HALFWORD; 

  dma_init_struct.memory_inc_enable = TRUE; 

  dma_init_struct.peripheral_base_addr = (uint32_t)&(ADC1->odt); 

  dma_init_struct.peripheral_data_width = DMA_PERIPHERAL_DATA_WIDTH_HALFWORD; 

  dma_init_struct.peripheral_inc_enable = FALSE; 

  dma_init_struct.priority = DMA_PRIORITY_HIGH; 

  dma_init_struct.loop_mode_enable = FALSE; 

  dma_init(DMA1_CHANNEL1, &dma_init_struct); 

   

  dmamux_enable(DMA1, TRUE); 

  dmamux_init(DMA1MUX_CHANNEL1, DMAMUX_DMAREQ_ID_ADC1); 

   

  /* enable dma transfer complete interrupt */ 

  dma_interrupt_enable(DMA1_CHANNEL1, DMA_FDT_INT, TRUE); 

  dma_channel_enable(DMA1_CHANNEL1, TRUE);  

} 

static void adc_config(void) 

{ 

  adc_common_config_type adc_common_struct; 

  adc_base_config_type adc_base_struct; 

  crm_periph_clock_enable(CRM_ADC1_PERIPH_CLOCK, TRUE); 

  nvic_irq_enable(ADC1_2_3_IRQn, 0, 0); 

   

  adc_common_default_para_init(&adc_common_struct); 

   

  /* config combine mode */ 

  adc_common_struct.combine_mode = ADC_INDEPENDENT_MODE; 

   

  /* config division,adcclk is division by hclk */ 

  adc_common_struct.div = ADC_HCLK_DIV_4; 

   

  /* config common dma mode,it's not useful in independent mode */ 

  adc_common_struct.common_dma_mode = ADC_COMMON_DMAMODE_DISABLE;

 /* config common dma request repeat */ 

  adc_common_struct.common_dma_request_repeat_state = FALSE; 

   

  /* config adjacent adc sampling interval,it's useful for ordinary shifting mode */ 

  adc_common_struct.sampling_interval = ADC_SAMPLING_INTERVAL_5CYCLES; 

   

  /* config inner temperature sensor and vintrv */ 

  adc_common_struct.tempervintrv_state = FALSE; 

   

  /* config voltage battery */ 

  adc_common_struct.vbat_state = FALSE; 

  adc_common_config(&adc_common_struct); 

   

  adc_base_default_para_init(&adc_base_struct); 

   

  adc_base_struct.sequence_mode = TRUE; 

  adc_base_struct.repeat_mode = FALSE; 

  adc_base_struct.data_align = ADC_RIGHT_ALIGNMENT; 

  adc_base_struct.ordinary_channel_length = 3; 

  adc_base_config(ADC1, &adc_base_struct); 

  adc_resolution_set(ADC1, ADC_RESOLUTION_12B); 

   

  /* config ordinary channel */ 

  adc_ordinary_channel_set(ADC1, ADC_CHANNEL_4, 1, ADC_SAMPLETIME_6_5); 

  adc_ordinary_channel_set(ADC1, ADC_CHANNEL_5, 2, ADC_SAMPLETIME_6_5); 

  adc_ordinary_channel_set(ADC1, ADC_CHANNEL_6, 3, ADC_SAMPLETIME_6_5); 

   

  /* config ordinary trigger source and trigger edge */ 

  adc_ordinary_conversion_trigger_set(ADC1, ADC_ORDINARY_TRIG_TMR1CH1, 

ADC_ORDINARY_TRIG_EDGE_NONE); 

   

  /* config dma mode,it's not useful when common dma mode is use */ 

  adc_dma_mode_enable(ADC1, TRUE); 

   

  /* config dma request repeat,it's not useful when common dma mode is use */ 

  adc_dma_request_repeat_enable(ADC1, FALSE); 

   

  /* config preempt channel */ 

  adc_preempt_channel_length_set(ADC1, 3); 

  adc_preempt_channel_set(ADC1, ADC_CHANNEL_7, 1, ADC_SAMPLETIME_6_5); 

  adc_preempt_channel_set(ADC1, ADC_CHANNEL_8, 2, ADC_SAMPLETIME_6_5); 

  adc_preempt_channel_set(ADC1, ADC_CHANNEL_9, 3, ADC_SAMPLETIME_6_5); 

   

  /* config preempt trigger source and trigger edge */ 

  adc_preempt_conversion_trigger_set(ADC1, ADC_PREEMPT_TRIG_TMR1CH4, 

ADC_PREEMPT_TRIG_EDGE_NONE);

 /* disable preempt group automatic conversion after ordinary group */ 

  adc_preempt_auto_mode_enable(ADC1, FALSE); 

   

  /* enable adc overflow interrupt */ 

  adc_interrupt_enable(ADC1, ADC_OCCO_INT, TRUE); 

   

  /* enable adc preempt channels conversion end interrupt */ 

  adc_interrupt_enable(ADC1, ADC_PCCE_INT, TRUE); 

   

  /* set oversampling ratio and shift */ 

  adc_oversample_ratio_shift_set(ADC1, ADC_OVERSAMPLE_RATIO_8, 

ADC_OVERSAMPLE_SHIFT_3); 

   

  /* disable ordinary oversampling trigger mode */ 

  adc_ordinary_oversample_trig_enable(ADC1, FALSE); 

   

  /* set ordinary oversample restart mode */ 

  adc_ordinary_oversample_restart_set(ADC1, ADC_OVERSAMPLE_CONTINUE); 

   

  /* enable ordinary oversampling */ 

  adc_ordinary_oversample_enable(ADC1, TRUE); 

   

  /* enable preempt oversampling */ 

  adc_preempt_oversample_enable(ADC1, TRUE); 

   

  /* adc enable */ 

  adc_enable(ADC1, TRUE); 

  while(adc_flag_get(ADC1, ADC_RDY_FLAG) == RESET); 

   

  /* adc calibration */ 

  adc_calibration_init(ADC1); 

  while(adc_calibration_init_status_get(ADC1)); 

  adc_calibration_start(ADC1); 

  while(adc_calibration_status_get(ADC1)); 

}

/* 获取普通通道数据传输完成状态 */ 

void DMA1_Channel1_IRQHandler(void) 

{ 

  if(dma_flag_get(DMA1_FDT1_FLAG) != RESET) 

  { 

    dma_flag_clear(DMA1_FDT1_FLAG); 

    dma1_trans_complete_flag = 1; 

  } 

} 

/* 获取ADC的溢出状态信息及抢占通道转换数据 */ 

void ADC1_2_3_IRQHandler(void) 

{ 

  if(adc_flag_get(ADC1, ADC_OCCO_FLAG) != RESET) 

  { 

    adc_flag_clear(ADC1, ADC_OCCO_FLAG); 

    adc1_overflow_flag++; 

  } 

  if(adc_flag_get(ADC1, ADC_PCCE_FLAG) != RESET) 

  { 

    adc_flag_clear(ADC1, ADC_PCCE_FLAG); 

    if(preempt_conversion_count < 5) 

    { 

      adc1_preempt_valuetab[preempt_conversion_count][0] = adc_preempt_conversion_data_get(ADC1, 

ADC_PREEMPT_CHANNEL_1); 

      adc1_preempt_valuetab[preempt_conversion_count][1] = adc_preempt_conversion_data_get(ADC1, 

ADC_PREEMPT_CHANNEL_2); 

      adc1_preempt_valuetab[preempt_conversion_count][2] = adc_preempt_conversion_data_get(ADC1, 

ADC_PREEMPT_CHANNEL_3); 

      preempt_conversion_count++; 

    } 

  } 

} 

int main(void) 

{ 

  __IO uint32_t index = 0; 

  nvic_priority_group_config(NVIC_PRIORITY_GROUP_4); 

   

  /* config the system clock */ 

  system_clock_config(); 

   

  /* init at start board */ 

  at32_board_init(); 

  at32_led_off(LED2); 

  at32_led_off(LED3); 

  at32_led_off(LED4); 

  usart1_config(115200); 

  gpio_config(); 

  dma_config(); 

  adc_config(); 

  printf("ordinary_preempt_oversampling \r\n"); 

   

  /* adc1 software trigger start conversion */

 for(index = 0; index < 5; index++) 

  { 

    adc_ordinary_software_trigger_enable(ADC1, TRUE); 

    adc_preempt_software_trigger_enable(ADC1, TRUE); 

    delay_sec(1); 

  } 

  if((dma_trans_complete_flag == 0) || (adc1_overflow_flag != 0)) 

  { 

    /* printf flag when error occur */ 

    at32_led_on(LED3); 

    at32_led_on(LED4); 

    printf("error occur\r\n"); 

    printf("adc1_overflow_flag = %d\r\n",adc1_overflow_flag); 

    printf("dma_trans_complete_flag = %d\r\n",dma_trans_complete_flag); 

  } 

  else 

  { 

    /* printf data when conversion end without error */ 

    printf("conversion end without error\r\n"); 

    for(index = 0; index < 5; index++) 

    { 

      printf("adc1_ordinary_valuetab[%d][0] = 0x%x\r\n", index, adc1_ordinary_valuetab[index][0]); 

      printf("adc1_ordinary_valuetab[%d][1] = 0x%x\r\n", index, adc1_ordinary_valuetab[index][1]); 

      printf("adc1_ordinary_valuetab[%d][2] = 0x%x\r\n", index, adc1_ordinary_valuetab[index][2]); 

      printf("adc1_preempt_valuetab[%d][0] = 0x%x\r\n", index, adc1_preempt_valuetab[index][0]); 

      printf("adc1_preempt_valuetab[%d][1] = 0x%x\r\n", index, adc1_preempt_valuetab[index][1]); 

      printf("adc1_preempt_valuetab[%d][2] = 0x%x\r\n", index, adc1_preempt_valuetab[index][2]); 

      printf("\r\n"); 

    } 

  } 

  at32_led_on(LED2); 

  while(1) 

  { 

  } 

}