ADC双Buffer

static void gpio_config(void) 

{ 

gpio_init_type gpio_initstructure; 

crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE); 

gpio_default_para_init(&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_init(GPIOA, &gpio_initstructure); 

}    

static void edma_config(void) 

{ 

edma_init_type edma_init_struct; 

crm_periph_clock_enable(CRM_EDMA_PERIPH_CLOCK, TRUE); 

nvic_irq_enable(EDMA_Stream1_IRQn, 0, 0);

 edma_reset(EDMA_STREAM1); 

  edma_default_para_init(&edma_init_struct); 

  edma_init_struct.buffer_size = 3; 

  edma_init_struct.direction = EDMA_DIR_PERIPHERAL_TO_MEMORY; 

  edma_init_struct.memory0_base_addr = (uint32_t)adc1_ordinary_valuetab; 

  edma_init_struct.memory_burst_mode = EDMA_MEMORY_SINGLE; 

  edma_init_struct.memory_data_width = EDMA_MEMORY_DATA_WIDTH_HALFWORD; 

  edma_init_struct.memory_inc_enable = TRUE; 

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

  edma_init_struct.peripheral_burst_mode = EDMA_PERIPHERAL_SINGLE; 

  edma_init_struct.peripheral_data_width = EDMA_PERIPHERAL_DATA_WIDTH_HALFWORD; 

  edma_init_struct.peripheral_inc_enable = FALSE; 

  edma_init_struct.priority = EDMA_PRIORITY_VERY_HIGH; 

  edma_init_struct.loop_mode_enable = FALSE; 

  edma_init_struct.fifo_threshold = EDMA_FIFO_THRESHOLD_1QUARTER; 

  edma_init_struct.fifo_mode_enable = FALSE; 

  edma_init(EDMA_STREAM1, &edma_init_struct); 

 

  /* edmamux init and enable */ 

  edmamux_enable(TRUE); 

  edmamux_init(EDMAMUX_CHANNEL1, EDMAMUX_DMAREQ_ID_ADC1); 

 

  /* config double buffer mode */ 

  edma_double_buffer_mode_init(EDMA_STREAM1, (uint32_t)double_adc1_ordinary_valuetab, 

EDMA_MEMORY_0); 

 

  /* enable the double memory mode */ 

  edma_double_buffer_mode_enable(EDMA_STREAM1, TRUE); 

 

  /* enable edma full data transfer intterrupt */ 

  edma_interrupt_enable(EDMA_STREAM1, EDMA_FDT_INT, TRUE); 

  edma_stream_enable(EDMA_STREAM1, 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_17; 

 

  /* 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_640_5); 

  adc_ordinary_channel_set(ADC1, ADC_CHANNEL_5, 2, ADC_SAMPLETIME_640_5); 

  adc_ordinary_channel_set(ADC1, ADC_CHANNEL_6, 3, ADC_SAMPLETIME_640_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, TRUE);

 /* enable adc overflow interrupt */ 

  adc_interrupt_enable(ADC1, ADC_OCCO_INT, 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 EDMA_Stream1_IRQHandler(void) 

{ 

  if(edma_flag_get(EDMA_FDT1_FLAG) != RESET) 

  { 

    if(edma_memory_target_get(EDMA_STREAM1)) 

    { 

      double_buffer_is_useful = 0; 

    } 

    else 

    { 

      double_buffer_is_useful = 1; 

    } 

    edma_flag_clear(EDMA_FDT1_FLAG); 

    edma_trans_complete_flag = 1; 

  } 

} 

/* 获取ADC的溢出状态信息 */ 

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++; 

  } 

} 

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(); 

  edma_config(); 

  adc_config(); 

  printf("edma_double_buffer \r\n"); 

  while(1) 

  { 

    adc_ordinary_software_trigger_enable(ADC1, TRUE); 

    while(edma_trans_complete_flag == 0); 

    edma_trans_complete_flag = 0; 

    if(adc1_overflow_flag != 0) 

    { 

      /* printf flag when error occur */ 

      at32_led_on(LED4); 

      printf("error occur\r\n"); 

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

    } 

    else 

    { 

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

      /* printf data when conversion end without error */ 

      if(double_buffer_is_useful == 1) 

      { 

        printf("double_adc1_ordinary_valuetab[0] = 0x%x\r\n", double_adc1_ordinary_valuetab[0]); 

        printf("double_adc1_ordinary_valuetab[1] = 0x%x\r\n", double_adc1_ordinary_valuetab[1]); 

        printf("double_adc1_ordinary_valuetab[2] = 0x%x\r\n", double_adc1_ordinary_valuetab[2]); 

      } 

      else 

      { 

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

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

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

      } 

    } 

    printf("\r\n"); 

    delay_sec(1); 

  }

}