在使用AT32F403ACGT7的ADC采集时，发现ADC无法达到2MSPS，不知原因在哪里？配置使用的雅特力提供的Work Bench，ADC时钟为28MHz，每路ADC只采集一个通道，ADC1和ADC2使用一路DMA控制。触发使用的是定时器2的CH2。
void wk_adc12_init(void)
{
gpio_init_type gpio_init_struct;
adc_base_config_type adc_base_struct;
gpio_default_para_init(&gpio_init_struct);
/* add user code begin adc1_init 1 */
/* add user code end adc1_init 1 */
/*gpio--------------------------------------------------------------------*/
/* configure the IN2 pin and configure the IN6 pin*/
gpio_init_struct.gpio_mode = GPIO_MODE_ANALOG;
gpio_init_struct.gpio_pins = GPIO_PINS_2 | GPIO_PINS_6;
gpio_init(GPIOA, &gpio_init_struct);
crm_adc_clock_div_set(CRM_ADC_DIV_4);
/*adc_common_settings-------------------------------------------------------------*/
adc_combine_mode_select(ADC_ORDINARY_SMLT_ONLY_MODE);
/*adc_settings--------------------------------------------------------------------*/
adc_base_default_para_init(&adc_base_struct);
adc_base_struct.sequence_mode = FALSE;
adc_base_struct.repeat_mode = FALSE;
adc_base_struct.data_align = ADC_LEFT_ALIGNMENT;
adc_base_struct.ordinary_channel_length = 1;
adc_base_config(ADC1, &adc_base_struct);
/* adc_ordinary_conversionmode-------------------------------------------- */
adc_ordinary_channel_set(ADC1, ADC_CHANNEL_2, 1, ADC_SAMPLETIME_1_5);
adc_ordinary_conversion_trigger_set(ADC1, ADC12_ORDINARY_TRIG_TMR2CH2, TRUE); // 定时器2触发
adc_dma_mode_enable(ADC1, TRUE);
/*adc_settings--------------------------------------------------------------------*/
adc_base_config(ADC2, &adc_base_struct);
/* adc_ordinary_conversionmode-------------------------------------------- */
adc_ordinary_channel_set(ADC2, ADC_CHANNEL_6, 1, ADC_SAMPLETIME_1_5);
adc_ordinary_conversion_trigger_set(ADC2, ADC12_ORDINARY_TRIG_SOFTWARE, TRUE);
adc_interrupt_enable(ADC1, ADC_CCE_INT, TRUE);
adc_enable(ADC1, TRUE);
adc_enable(ADC2, TRUE);
/* adc calibration-------------------------------------------------------- */
adc_calibration_init(ADC1);
while(adc_calibration_init_status_get(ADC1));
adc_calibration_start(ADC1);
while(adc_calibration_status_get(ADC1));
/* adc calibration-------------------------------------------------------- */
adc_calibration_init(ADC2);
while(adc_calibration_init_status_get(ADC2));
adc_calibration_start(ADC2);
while(adc_calibration_status_get(ADC2));
adc_enable(ADC1, FALSE); adc_enable(ADC2, FALSE);
}
void wk_dma1_channel2_init(void) // DMA初始化
{
dma_init_type dma_init_struct;
dma_reset(DMA1_CHANNEL2);
dma_default_para_init(&dma_init_struct);
dma_init_struct.direction = DMA_DIR_PERIPHERAL_TO_MEMORY;
dma_init_struct.memory_data_width = DMA_MEMORY_DATA_WIDTH_WORD;
dma_init_struct.memory_inc_enable = TRUE;
dma_init_struct.peripheral_data_width = DMA_PERIPHERAL_DATA_WIDTH_WORD;
dma_init_struct.peripheral_inc_enable = FALSE;
dma_init_struct.priority = DMA_PRIORITY_LOW;
dma_init_struct.loop_mode_enable = TRUE;
dma_init(DMA1_CHANNEL2, &dma_init_struct);
/* flexible function enable */
dma_flexible_config(DMA1, FLEX_CHANNEL2, DMA_FLEXIBLE_ADC1);
wk_dma_channel_config(DMA1_CHANNEL2,
(uint32_t)&ADC1->odt,
(uint32_t)adc_buff,
1024);
dma_channel_enable(DMA1_CHANNEL2, TRUE);
}
// 定时器2初始化
void wk_tmr2_init(void)
{
tmr_output_config_type tmr_oc_init_structure;
/* configure counter settings */
tmr_cnt_dir_set(TMR2, TMR_COUNT_UP);
tmr_clock_source_div_set(TMR2, TMR_CLOCK_DIV1);
tmr_base_init(TMR2, 3, 27);
/* configure overflow event */
tmr_output_default_para_init(&tmr_oc_init_structure);
tmr_oc_init_structure.oc_mode = TMR_OUTPUT_CONTROL_PWM_MODE_A;
tmr_oc_init_structure.oc_polarity = TMR_OUTPUT_ACTIVE_LOW;
tmr_oc_init_structure.oc_output_state = TRUE;
tmr_oc_init_structure.oc_idle_state = FALSE;
tmr_output_channel_config(TMR2, TMR_SELECT_CHANNEL_2, &tmr_oc_init_structure);
tmr_channel_enable(TMR2, TMR_SELECT_CHANNEL_2, TRUE);
tmr_channel_value_set(TMR2, TMR_SELECT_CHANNEL_2, 2);
//tmr_counter_enable(TMR2, TRUE);
}
以上就是ADC相关的初始化，对被采对象采集时，发现，只能达到1MHZ的采样速率，还望熟悉的工程师告知问题，谢谢！！！
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