GD32H759的ADC的DMA传输

只看该作者 · 2025-3-11 16:54

GD32H759的ADC的DMA传输,DMA传输完成后进入传输完成中断后，ADC需要重新初始化才能正常采样。如果不开启传输完成中断，ADC可以一直采样传输。但是一使用传输完成中断，在传输完成中断中先关闭DMA通道，读取完数据后，在开启DMA通道后，要重新初始化ADC才能正常采样，否则ADC就无法采样数据完成DMA传输完成中断。ADC和DMA配置如下：

/*!
\brief    configure the DMA peripheral
\param[in]  none
\param[out] none
\retval    none
*/
void adc_dma_config(void)
{
/* ADC_DMA_channel configuration */
dma_single_data_parameter_struct dma_single_data_parameter;

nvic_priority_group_set(NVIC_PRIGROUP_PRE4_SUB0);
nvic_irq_enable(DMA0_Channel0_IRQn, 2, 0);

rcu_periph_clock_enable(RCU_DMA0);
rcu_periph_clock_enable(RCU_DMAMUX);
nvic_priority_group_set(NVIC_PRIGROUP_PRE4_SUB0);
nvic_irq_enable(DMA0_Channel0_IRQn, 1, 0);

SCB_CleanDCache_by_Addr((uint32_t*)WindADC_Buf, WIND_ADCBUF_SIZE*2);

/* ADC DMA_channel configuration */
dma_deinit(DMA0, DMA_CH0);

/* initialize DMA single data mode */
dma_single_data_parameter.request = DMA_REQUEST_ADC2;
dma_single_data_parameter.periph_addr = (uint32_t)(&ADC_RDATA(ADC2));
dma_single_data_parameter.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
dma_single_data_parameter.memory0_addr = (uint32_t)(&WindADC_Buf);
dma_single_data_parameter.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
dma_single_data_parameter.periph_memory_width = DMA_PERIPH_WIDTH_16BIT;
dma_single_data_parameter.direction = DMA_PERIPH_TO_MEMORY;
dma_single_data_parameter.number = WIND_ADCBUF_SIZE;
dma_single_data_parameter.priority = DMA_PRIORITY_HIGH;
dma_single_data_parameter.circular_mode = DMA_CIRCULAR_MODE_ENABLE;
dma_single_data_mode_init(DMA0, DMA_CH0, &dma_single_data_parameter);

/* enable DMA circulation mode */
dma_circulation_enable(DMA0, DMA_CH0);

dma_interrupt_enable(DMA0, DMA_CH0, DMA_INT_FTF);

/* enable DMA channel */
dma_channel_enable(DMA0, DMA_CH0);

}

void adc_config(void)
{
rcu_periph_clock_enable(RCU_GPIOC);

rcu_periph_clock_enable(RCU_ADC0);

rcu_periph_clock_enable(RCU_GPIOC);    // 使能GPIOC时钟
rcu_periph_clock_enable(RCU_ADC2);    // 使能ADC2时钟
syscfg_analog_switch_enable(SYSCFG_PC2_ANALOG_SWITCH);
syscfg_analog_switch_enable(SYSCFG_PC3_ANALOG_SWITCH);
/* reset ADC */
adc_deinit(WIND_ADC);
/* ADC clock config */

adc_clock_config(WIND_ADC, ADC_CLK_SYNC_HCLK_DIV6);
/* ADC contineous function enable */
adc_special_function_config(WIND_ADC, ADC_CONTINUOUS_MODE, ENABLE);
/* ADC scan mode enable */
adc_special_function_config(WIND_ADC, ADC_SCAN_MODE, ENABLE);
/* ADC resolution config */
adc_resolution_config(WIND_ADC, ADC_RESOLUTION_12B);
/* ADC data alignment config */
adc_data_alignment_config(WIND_ADC, ADC_DATAALIGN_RIGHT);

/* ADC channel length config */
adc_channel_length_config(WIND_ADC, ADC_REGULAR_CHANNEL, 1);

/* ADC regular channel config */
adc_regular_channel_config(WIND_ADC, 0, WIND_ADC_DP_CHANNEL, 0);

adc_channel_differential_mode_config(WIND_ADC, ADC_DIFFERENTIAL_MODE_CHANNEL_0, ENABLE);

/* ADC trigger config */
adc_external_trigger_config(WIND_ADC, ADC_REGULAR_CHANNEL, EXTERNAL_TRIGGER_DISABLE);

/* ADC DMA function enable */
adc_dma_request_after_last_enable(WIND_ADC);
adc_dma_mode_enable(WIND_ADC);

/* enable ADC interface */
adc_enable(WIND_ADC);
/* wait for ADC stability */
delay_ms(1);
/* ADC calibration mode config */
adc_calibration_mode_config(WIND_ADC, ADC_CALIBRATION_OFFSET);
/* ADC calibration number config */
adc_calibration_number(WIND_ADC, ADC_CALIBRATION_NUM1);
/* ADC calibration and reset calibration */
adc_calibration_enable(WIND_ADC);

/* ADC software trigger enable */
adc_software_trigger_enable(WIND_ADC, ADC_REGULAR_CHANNEL);
}

void DMA0_Channel0_IRQHandler(void)
{
if(RESET != dma_interrupt_flag_get(DMA0, DMA_CH0, DMA_INT_FLAG_FTF))
{
      dma_interrupt_flag_clear(DMA0, DMA_CH0, DMA_INT_FLAG_FTF);
dma_channel_disable(DMA0, DMA_CH0);
SCB_InvalidateDCache_by_Addr((uint32_t*)WindADC_Buf, WIND_ADCBUF_SIZE*2);
memset(WindADC_Buf,0,WIND_ADCBUF_SIZE*2);
LED0_TOGGLE();

}
}

int main(void)
{
   adc_dma_config();
adc_config();

while(1)
{

dma_channel_enable(DMA0, DMA_CH0);
            adc_software_trigger_enable(WIND_ADC, ADC_REGULAR_CHANNEL);
delay_ms(100);

}

return 0;
}