【AT-START-F425测评】+ A/D数据采集与显示

jinglixixi

【AT-START-F425测评】+ A/D数据采集与显示 [复制链接]

 

在AT32F425的芯片内部，配置了1个采样率高达2Msps的12位16通道高速ADC。

将串行数码管与A/D数据采集结合在一起就可直观地查看检测值。

串行数码管与开发板的连接关系为：

SCL---PC2

SDA---PC3

CS ---PC5

模拟的信号输入通道为ADC_CH5，其使用的引脚为PA5。

进行A/D数据采集与显示的效果如图1至图3所示。

图1 检测3.3V电压

图2检测悬空状态

图3检测GND电压

 

其中串行数码管的驱动程序如下：

void Max7219_Init(void)
{
    gpio_init_type gpio_init_struct;
    crm_periph_clock_enable(CRM_GPIOC_PERIPH_CLOCK, TRUE);
    gpio_default_para_init(&gpio_init_struct);
    gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
    gpio_init_struct.gpio_out_type  = GPIO_OUTPUT_PUSH_PULL;
    gpio_init_struct.gpio_mode = GPIO_MODE_OUTPUT;
    gpio_init_struct.gpio_pins = GPIO_PINS_2|GPIO_PINS_3|GPIO_PINS_5;
    gpio_init(GPIOC, &gpio_init_struct);
}

void Write_Max7219_byte(unsigned char DATA)
{
      unsigned char i;
      GPIOC->clr = GPIO_PINS_5;
      delay_us(10);
      for(i=8;i>=1;i--)
      {
           GPIOC->clr = GPIO_PINS_2;
           if(DATA&0x80)  GPIOC->scr = GPIO_PINS_3;
           else  GPIOC->clr = GPIO_PINS_3;
           delay_us(10);
           DATA=DATA<<1;
           GPIOC->scr = GPIO_PINS_2;
           delay_us(10);
           }
}

void Write_Max7219(char address,char dat)
{
      GPIOC->clr = GPIO_PINS_5;
      Write_Max7219_byte(address);
      Write_Max7219_byte(dat);
      GPIOC->scr = GPIO_PINS_5;
}

void Init_MAX7219(void)
{
      Write_Max7219(0x09, 0xff);
      Write_Max7219(0x0a, 0x03);
      Write_Max7219(0x0b, 0x07);
      Write_Max7219(0x0c, 0x01);
      Write_Max7219(0x0f, 0x01);
}

设置ADC输入引脚的函数为：

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);
  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);
}

ADC与DMA的配置函数为：

static void adc_config(void)
{
  adc_base_config_type adc_base_struct;
  crm_periph_clock_enable(CRM_ADC1_PERIPH_CLOCK, TRUE);
  crm_adc_clock_div_set(CRM_ADC_DIV_6);
  nvic_irq_enable(ADC1_IRQn, 0, 0);
  adc_combine_mode_select(ADC_INDEPENDENT_MODE);
  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_ordinary_channel_set(ADC1, ADC_CHANNEL_4, 1, ADC_SAMPLETIME_239_5);
  adc_ordinary_channel_set(ADC1, ADC_CHANNEL_5, 2, ADC_SAMPLETIME_239_5);
  adc_ordinary_channel_set(ADC1, ADC_CHANNEL_6, 3, ADC_SAMPLETIME_239_5);
  adc_ordinary_conversion_trigger_set(ADC1, ADC12_ORDINARY_TRIG_SOFTWARE, TRUE);
  adc_dma_mode_enable(ADC1, TRUE);
  adc_voltage_monitor_enable(ADC1, ADC_VMONITOR_SINGLE_ORDINARY);
  adc_voltage_monitor_threshold_value_set(ADC1, 0xBBB, 0xAAA);
  adc_voltage_monitor_single_channel_select(ADC1, ADC_CHANNEL_5);
  adc_interrupt_enable(ADC1, ADC_VMOR_INT, TRUE);
  adc_enable(ADC1, TRUE);
  adc_calibration_init(ADC1);
  while(adc_calibration_init_status_get(ADC1));
  adc_calibration_start(ADC1);
  while(adc_calibration_status_get(ADC1));
}

 

static void dma_config(void)
{
  dma_init_type dma_init_struct;
  crm_periph_clock_enable(CRM_DMA1_PERIPH_CLOCK, TRUE);
  dma_reset(DMA1_CHANNEL1);
  dma_flexible_config(DMA1, FLEX_CHANNEL1, DMA_FLEXIBLE_ADC1);
  dma_default_para_init(&dma_init_struct);
  dma_init_struct.buffer_size = 3;
  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 = TRUE;
  dma_init(DMA1_CHANNEL1, &dma_init_struct);
  dma_channel_enable(DMA1_CHANNEL1, TRUE);
}

所用的ADC中断处理函数为：

void ADC1_IRQHandler(void)
{
  if(adc_flag_get(ADC1, ADC_VMOR_FLAG) != RESET)
  {
    adc_flag_clear(ADC1, ADC_VMOR_FLAG);
    vmor_flag_index = 1;
  }
}

 

实现显示效果的主程序为：

int main(void)
{
  char n;
  uint16_t m;
  __IO uint32_t index = 0;
  nvic_priority_group_config(NVIC_PRIORITY_GROUP_4);
  system_clock_config();
  gpio_config();
  dma_config();
  adc_config();
  Max7219_Init();
  Init_MAX7219();
  delay_sec(1);
  Write_Max7219(0x0f, 0x00);
  Write_Max7219(1, 0x0f);
  Write_Max7219(2, 0x0f);
  Write_Max7219(3, 0x0f);
  Write_Max7219(4, 0x0f);
  Write_Max7219(5,0x0f);
  Write_Max7219(6,0x0f);
  Write_Max7219(7,0x0f);
  Write_Max7219(8,0x0f);
  while(1)
  {
    delay_sec(1);
    if(vmor_flag_index == 1)
    {
      vmor_flag_index = 0;
      m=adc1_ordinary_valuetab[1];
      n=m%10;
      Write_Max7219(1,n);
      n=m%100/10;
      Write_Max7219(2,n);
      n=m%1000/100;
      Write_Max7219(3,n);
      n=m/1000;
      Write_Max7219(4,n);
    }
    adc_ordinary_software_trigger_enable(ADC1, TRUE);
  }
}

 

Jacktang

A/D数据采集一般都是开发板的必测项目，，，，