[研电赛技术支持] GD32F103使用DMA方式实现ADC0数据循环采集

/*!

    \brief      configure the DMA peripheral

    \param[in]  none

    \param[out] none

    \retval     none

*/

void dma_config(void)

{

    /* ADC_DMA_channel configuration */

    dma_parameter_struct dma_data_parameter;

 

    /* enable DMA0 clock */

    rcu_periph_clock_enable(RCU_DMA0);  

  

    /* ADC DMA_channel configuration */

    dma_deinit(DMA0, DMA_CH0);

    

    /* initialize DMA data mode */

    dma_data_parameter.periph_addr  = (uint32_t)(&ADC_RDATA(ADC0));

    dma_data_parameter.periph_inc   = DMA_PERIPH_INCREASE_DISABLE;

    dma_data_parameter.memory_addr  = (uint32_t)(&adc_value);

    dma_data_parameter.memory_inc   = DMA_MEMORY_INCREASE_ENABLE;

    dma_data_parameter.periph_width = DMA_PERIPHERAL_WIDTH_16BIT;

    dma_data_parameter.memory_width = DMA_MEMORY_WIDTH_16BIT;  

    dma_data_parameter.direction    = DMA_PERIPHERAL_TO_MEMORY;

    dma_data_parameter.number       = 100;                

    dma_data_parameter.priority     = DMA_PRIORITY_ULTRA_HIGH;

    dma_init(DMA0, DMA_CH0, &dma_data_parameter);



    dma_circulation_enable(DMA0, DMA_CH0);        //采集完100个之后，循环

    

    /* enable DMA transfer complete interrupt */

    dma_interrupt_enable(DMA0, DMA_CH0, DMA_INT_FTF);        //打开全部完成中断

    dma_interrupt_enable(DMA0, DMA_CH0, DMA_INT_HTF);        //打开一半完成中断

  

    /* enable DMA channel */

    dma_channel_enable(DMA0, DMA_CH0);

    

    nvic_irq_enable(DMA0_Channel0_IRQn, 0, 0);

}



/*!

    \brief      configure the TIMER peripheral

    \param[in]  none

    \param[out] none

    \retval     none

*/

void timer1_config(void)        //1ms采集一次

{

    timer_oc_parameter_struct timer_ocintpara;

    timer_parameter_struct timer_initpara;



    /* enable timer1 clock */

    rcu_periph_clock_enable(RCU_TIMER1);

  

    /* TIMER1 configuration */

    timer_initpara.prescaler         = 107;

    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;

    timer_initpara.counterdirection  = TIMER_COUNTER_UP;

    timer_initpara.period            = 999;

    timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;

    timer_initpara.repetitioncounter = 0;

    timer_init(TIMER1,&timer_initpara);



    /* CH0 configuration in PWM mode1 */

    timer_ocintpara.ocpolarity  = TIMER_OC_POLARITY_HIGH;

    timer_ocintpara.outputstate = TIMER_CCX_ENABLE;

    timer_channel_output_config(TIMER1, TIMER_CH_1, &timer_ocintpara);



    timer_channel_output_pulse_value_config(TIMER1, TIMER_CH_1, 499);

    timer_channel_output_mode_config(TIMER1, TIMER_CH_1, TIMER_OC_MODE_PWM1);

    timer_channel_output_shadow_config(TIMER1, TIMER_CH_1, TIMER_OC_SHADOW_DISABLE);

}



/*!

    \brief      configure the ADC peripheral

    \param[in]  none

    \param[out] none

    \retval     none

*/

void adc_config(void)

{

    /* enable ADC0 clock */

    rcu_periph_clock_enable(RCU_ADC0);

   /* reset ADC */

    adc_deinit(ADC0);

    /* ADC mode config */

    adc_mode_config(ADC_MODE_FREE); 

    /* ADC continous function enable */

    adc_special_function_config(ADC0, ADC_SCAN_MODE, DISABLE); 

 

    /* ADC data alignment config */

    adc_data_alignment_config(ADC0, ADC_DATAALIGN_RIGHT);

    /* ADC channel length config */

    adc_channel_length_config(ADC0, ADC_REGULAR_CHANNEL, 1);

  

  

    /* ADC regular channel config */

    adc_regular_channel_config(ADC0, 0, AD0_CH, ADC_SAMPLETIME_55POINT5);



    /* ADC trigger config */

    adc_external_trigger_source_config(ADC0, ADC_REGULAR_CHANNEL, ADC0_1_EXTTRIG_REGULAR_T1_CH1);

        /* ADC external trigger enable */

    adc_external_trigger_config(ADC0, ADC_REGULAR_CHANNEL, ENABLE);



    /* enable ADC interface */

    adc_enable(ADC0);  

    delay_1ms(1);

    /* ADC calibration and reset calibration */

    adc_calibration_enable(ADC0);  



    /* ADC DMA function enable */

    adc_dma_mode_enable(ADC0);

}



/*!

    \brief      this function handles DMA_Channel3_IRQHandler interrupt

    \param[in]  none

    \param[out] none

    \retval     none

*/

void DMA0_Channel0_IRQHandler(void)

{

  if(dma_interrupt_flag_get(DMA0, DMA_CH0, DMA_INT_FLAG_FTF))

  {     

    dma_interrupt_flag_clear(DMA0, DMA_CH0, DMA_INT_FLAG_FTF);

//    dma_interrupt_flag_clear(DMA0, DMA_CH0, DMA_INT_FLAG_G);

   

  }

  else if(dma_interrupt_flag_get(DMA0, DMA_CH0, DMA_INT_FLAG_HTF))

  {

    dma_interrupt_flag_clear(DMA0, DMA_CH0, DMA_INT_FLAG_HTF);

//    dma_interrupt_flag_clear(DMA0, DMA_CH0, DMA_INT_FLAG_G);

    dmaHalfIntCnt ++;

//    uart_dma_start();



  }

}



void dma_start(void)

{

  timer1_config();

  dma_config();

  adc_config();

  /* enable TIMER1 */

  timer_enable(TIMER1);



}