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[AT32F435] AT32F435/437 ADC过采样

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 楼主| 我想看大海 发表于 2024-11-16 18:15 | 显示全部楼层 |阅读模式
AD, ADC, dc, AT32F4, 437
配置流程   配置ADC使用的GPIO
 配置用于普通通道数据传输的DMA
 ADC相关配置设定
 软件触发转换
 获取转换数据


GPIO配置函数代码
复制
  1. static void gpio_config(void) 
    

  2. { 
    

  3. gpio_init_type gpio_initstructure; 
    

  4. crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE); 
    

  5. crm_periph_clock_enable(CRM_GPIOB_PERIPH_CLOCK, TRUE); 
    

  6. gpio_default_para_init(&gpio_initstructure); 
    

  7. gpio_initstructure.gpio_mode = GPIO_MODE_ANALOG; 
    

  8. gpio_initstructure.gpio_pins = GPIO_PINS_0 | GPIO_PINS_1; 
    

  9. gpio_init(GPIOB, &gpio_initstructure);} 
    

  10. /* config adc pin as analog input mode */ 
    

  11. gpio_initstructure.gpio_mode = GPIO_MODE_ANALOG; 
    

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

  13. gpio_init(GPIOA, &gpio_initstructure);
DMA配置函数代码
复制
  1. static void dma_config(void) 
    

  2. { 
    

  3.   dma_init_type dma_init_struct; 
    

  4.   crm_periph_clock_enable(CRM_DMA1_PERIPH_CLOCK, TRUE); 
    

  5.   nvic_irq_enable(DMA1_Channel1_IRQn, 0, 0); 
    

  6.    
    

  7.   dma_reset(DMA1_CHANNEL1); 
    

  8.   dma_default_para_init(&dma_init_struct); 
    

  9.   dma_init_struct.buffer_size = 15; 
    

  10.   dma_init_struct.direction = DMA_DIR_PERIPHERAL_TO_MEMORY; 
    

  11.   dma_init_struct.memory_base_addr = (uint32_t)adc1_ordinary_valuetab; 
    

  12.   dma_init_struct.memory_data_width = DMA_MEMORY_DATA_WIDTH_HALFWORD; 
    

  13.   dma_init_struct.memory_inc_enable = TRUE; 
    

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

  15.   dma_init_struct.peripheral_data_width = DMA_PERIPHERAL_DATA_WIDTH_HALFWORD; 
    

  16.   dma_init_struct.peripheral_inc_enable = FALSE; 
    

  17.   dma_init_struct.priority = DMA_PRIORITY_HIGH; 
    

  18.   dma_init_struct.loop_mode_enable = FALSE; 
    

  19.   dma_init(DMA1_CHANNEL1, &dma_init_struct); 
    

  20.    
    

  21.   dmamux_enable(DMA1, TRUE); 
    

  22.   dmamux_init(DMA1MUX_CHANNEL1, DMAMUX_DMAREQ_ID_ADC1); 
    

  23.    
    

  24.   /* enable dma transfer complete interrupt */ 
    

  25.   dma_interrupt_enable(DMA1_CHANNEL1, DMA_FDT_INT, TRUE); 
    

  26.   dma_channel_enable(DMA1_CHANNEL1, TRUE);  
    

  27. }
ADC配置函数代码
复制
  1. static void adc_config(void) 
    

  2. { 
    

  3.   adc_common_config_type adc_common_struct; 
    

  4.   adc_base_config_type adc_base_struct; 
    

  5.   crm_periph_clock_enable(CRM_ADC1_PERIPH_CLOCK, TRUE); 
    

  6.   nvic_irq_enable(ADC1_2_3_IRQn, 0, 0); 
    

  7.    
    

  8.   adc_common_default_para_init(&adc_common_struct); 
    

  9.    
    

  10.   /* config combine mode */ 
    

  11.   adc_common_struct.combine_mode = ADC_INDEPENDENT_MODE; 
    

  12.    
    

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

  14.   adc_common_struct.div = ADC_HCLK_DIV_4; 
    

  15.    
    

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

  17.   adc_common_struct.common_dma_mode = ADC_COMMON_DMAMODE_DISABLE;
    

  18.  /* config common dma request repeat */ 
    

  19.   adc_common_struct.common_dma_request_repeat_state = FALSE; 
    

  20.    
    

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

  22.   adc_common_struct.sampling_interval = ADC_SAMPLING_INTERVAL_5CYCLES; 
    

  23.    
    

  24.   /* config inner temperature sensor and vintrv */ 
    

  25.   adc_common_struct.tempervintrv_state = FALSE; 
    

  26.    
    

  27.   /* config voltage battery */ 
    

  28.   adc_common_struct.vbat_state = FALSE; 
    

  29.   adc_common_config(&adc_common_struct); 
    

  30.    
    

  31.   adc_base_default_para_init(&adc_base_struct); 
    

  32.    
    

  33.   adc_base_struct.sequence_mode = TRUE; 
    

  34.   adc_base_struct.repeat_mode = FALSE; 
    

  35.   adc_base_struct.data_align = ADC_RIGHT_ALIGNMENT; 
    

  36.   adc_base_struct.ordinary_channel_length = 3; 
    

  37.   adc_base_config(ADC1, &adc_base_struct); 
    

  38.   adc_resolution_set(ADC1, ADC_RESOLUTION_12B); 
    

  39.    
    

  40.   /* config ordinary channel */ 
    

  41.   adc_ordinary_channel_set(ADC1, ADC_CHANNEL_4, 1, ADC_SAMPLETIME_6_5); 
    

  42.   adc_ordinary_channel_set(ADC1, ADC_CHANNEL_5, 2, ADC_SAMPLETIME_6_5); 
    

  43.   adc_ordinary_channel_set(ADC1, ADC_CHANNEL_6, 3, ADC_SAMPLETIME_6_5); 
    

  44.    
    

  45.   /* config ordinary trigger source and trigger edge */ 
    

  46.   adc_ordinary_conversion_trigger_set(ADC1, ADC_ORDINARY_TRIG_TMR1CH1, 
    

  47. ADC_ORDINARY_TRIG_EDGE_NONE); 
    

  48.    
    

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

  50.   adc_dma_mode_enable(ADC1, TRUE); 
    

  51.    
    

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

  53.   adc_dma_request_repeat_enable(ADC1, FALSE); 
    

  54.    
    

  55.   /* config preempt channel */ 
    

  56.   adc_preempt_channel_length_set(ADC1, 3); 
    

  57.   adc_preempt_channel_set(ADC1, ADC_CHANNEL_7, 1, ADC_SAMPLETIME_6_5); 
    

  58.   adc_preempt_channel_set(ADC1, ADC_CHANNEL_8, 2, ADC_SAMPLETIME_6_5); 
    

  59.   adc_preempt_channel_set(ADC1, ADC_CHANNEL_9, 3, ADC_SAMPLETIME_6_5); 
    

  60.    
    

  61.   /* config preempt trigger source and trigger edge */ 
    

  62.   adc_preempt_conversion_trigger_set(ADC1, ADC_PREEMPT_TRIG_TMR1CH4, 
    

  63. ADC_PREEMPT_TRIG_EDGE_NONE);
    

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

  65.   adc_preempt_auto_mode_enable(ADC1, FALSE); 
    

  66.    
    

  67.   /* enable adc overflow interrupt */ 
    

  68.   adc_interrupt_enable(ADC1, ADC_OCCO_INT, TRUE); 
    

  69.    
    

  70.   /* enable adc preempt channels conversion end interrupt */ 
    

  71.   adc_interrupt_enable(ADC1, ADC_PCCE_INT, TRUE); 
    

  72.    
    

  73.   /* set oversampling ratio and shift */ 
    

  74.   adc_oversample_ratio_shift_set(ADC1, ADC_OVERSAMPLE_RATIO_8, 
    

  75. ADC_OVERSAMPLE_SHIFT_3); 
    

  76.    
    

  77.   /* disable ordinary oversampling trigger mode */ 
    

  78.   adc_ordinary_oversample_trig_enable(ADC1, FALSE); 
    

  79.    
    

  80.   /* set ordinary oversample restart mode */ 
    

  81.   adc_ordinary_oversample_restart_set(ADC1, ADC_OVERSAMPLE_CONTINUE); 
    

  82.    
    

  83.   /* enable ordinary oversampling */ 
    

  84.   adc_ordinary_oversample_enable(ADC1, TRUE); 
    

  85.    
    

  86.   /* enable preempt oversampling */ 
    

  87.   adc_preempt_oversample_enable(ADC1, TRUE); 
    

  88.    
    

  89.   /* adc enable */ 
    

  90.   adc_enable(ADC1, TRUE); 
    

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

  92.    
    

  93.   /* adc calibration */ 
    

  94.   adc_calibration_init(ADC1); 
    

  95.   while(adc_calibration_init_status_get(ADC1)); 
    

  96.   adc_calibration_start(ADC1); 
    

  97.   while(adc_calibration_status_get(ADC1)); 
    

  98. }

中断服务函数代码
复制
  1. /* 获取普通通道数据传输完成状态 */ 
    

  2. void DMA1_Channel1_IRQHandler(void) 
    

  3. { 
    

  4.   if(dma_flag_get(DMA1_FDT1_FLAG) != RESET) 
    

  5.   { 
    

  6.     dma_flag_clear(DMA1_FDT1_FLAG); 
    

  7.     dma1_trans_complete_flag = 1; 
    

  8.   } 
    

  9. } 
    

  10. /* 获取ADC的溢出状态信息及抢占通道转换数据 */ 
    

  11. void ADC1_2_3_IRQHandler(void) 
    

  12. { 
    

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

  14.   { 
    

  15.     adc_flag_clear(ADC1, ADC_OCCO_FLAG); 
    

  16.     adc1_overflow_flag++; 
    

  17.   } 
    

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

  19.   { 
    

  20.     adc_flag_clear(ADC1, ADC_PCCE_FLAG); 
    

  21.     if(preempt_conversion_count < 5) 
    

  22.     { 
    

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

  24. ADC_PREEMPT_CHANNEL_1); 
    

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

  26. ADC_PREEMPT_CHANNEL_2); 
    

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

  28. ADC_PREEMPT_CHANNEL_3); 
    

  29.       preempt_conversion_count++; 
    

  30.     } 
    

  31.   } 
    

  32. }

main函数代码
复制
  1. int main(void) 
    

  2. { 
    

  3.   __IO uint32_t index = 0; 
    

  4.   nvic_priority_group_config(NVIC_PRIORITY_GROUP_4); 
    

  5.    
    

  6.   /* config the system clock */ 
    

  7.   system_clock_config(); 
    

  8.    
    

  9.   /* init at start board */ 
    

  10.   at32_board_init(); 
    

  11.   at32_led_off(LED2); 
    

  12.   at32_led_off(LED3); 
    

  13.   at32_led_off(LED4); 
    

  14.   usart1_config(115200); 
    

  15.   gpio_config(); 
    

  16.   dma_config(); 
    

  17.   adc_config(); 
    

  18.   printf("ordinary_preempt_oversampling \r\n"); 
    

  19.    
    

  20.   /* adc1 software trigger start conversion */
    

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

  22.   { 
    

  23.     adc_ordinary_software_trigger_enable(ADC1, TRUE); 
    

  24.     adc_preempt_software_trigger_enable(ADC1, TRUE); 
    

  25.     delay_sec(1); 
    

  26.   } 
    

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

  28.   { 
    

  29.     /* printf flag when error occur */ 
    

  30.     at32_led_on(LED3); 
    

  31.     at32_led_on(LED4); 
    

  32.     printf("error occur\r\n"); 
    

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

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

  35.   } 
    

  36.   else 
    

  37.   { 
    

  38.     /* printf data when conversion end without error */ 
    

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

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

  41.     { 
    

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

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

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

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

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

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

  48.       printf("\r\n"); 
    

  49.     } 
    

  50.   } 
    

  51.   at32_led_on(LED2); 
    

  52.   while(1) 
    

  53.   { 
    

  54.   } 
    

  55. }



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黑心单片机 发表于 2024-11-16 19:27 | 显示全部楼层
过采样是不是会影响采集的效率
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呐咯密密 发表于 2024-11-19 10:05 | 显示全部楼层
这个代码很详细啊，非常好
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 楼主| 我想看大海 发表于 2024-11-20 20:36 | 显示全部楼层
黑心单片机 发表于 2024-11-16 19:27
过采样是不是会影响采集的效率

过采样会让采样时间延长，用时间换空间
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