GD32E230 ADC注入通道

外部触发输入的上升沿可以触发规则组或注入组的转换。
用于 ADC 规则通道的 规则通道的 外部触发

，很多场景上我们可以使用外部触发读取ADC，比如控制无刷电机要采样电机每相的电流时就需要用到注入通道，在每个PWM的高电平期间读取电机ABC相电流。大概配置如下：

//各个时钟初始化，GPIO的初始化void rcu_config_inject(void){/* enable GPIOC clock */    rcu_periph_clock_enable(RCU_GPIOA);    /* enable ADC clock */    rcu_periph_clock_enable(RCU_ADC);    /* enable timer1 clock */    rcu_periph_clock_enable(RCU_TIMER2);    /* config ADC clock */    rcu_adc_clock_config(RCU_ADCCK_APB2_DIV6);}void gpio_config_inject(void){/* config the GPIO as analog mode */    gpio_mode_set(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3);}//定时器初始化，做外部触发作用void timer_config_inject(void){timer_oc_parameter_struct timer_ocintpara;    timer_parameter_struct timer_initpara;    /* TIMER1 configuration */    timer_initpara.prescaler         = 71;    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;    timer_initpara.counterdirection  = TIMER_COUNTER_UP;    timer_initpara.period            = 999U;    timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;    timer_initpara.repetitioncounter = 0U;    timer_init(TIMER2, &timer_initpara);    /* CH0 configuration in PWM mode1 */    timer_ocintpara.ocpolarity  = TIMER_OC_POLARITY_HIGH;    timer_ocintpara.outputstate = TIMER_CCX_ENABLE;    timer_channel_output_config(TIMER2, TIMER_CH_3, &timer_ocintpara);    timer_channel_output_pulse_value_config(TIMER2, TIMER_CH_3, 1U);    timer_channel_output_mode_config(TIMER2, TIMER_CH_3, TIMER_OC_MODE_PWM1);    timer_channel_output_shadow_config(TIMER2, TIMER_CH_3, TIMER_OC_SHADOW_DISABLE);}//ADC注入通道的配置void adc_config_inject(void){/* ADC continous function enable */    adc_special_function_config(ADC_SCAN_MODE, ENABLE);    /* ADC trigger config */    adc_external_trigger_source_config(ADC_INSERTED_CHANNEL, ADC_EXTTRIG_INSERTED_T2_CH3);     /* ADC data alignment config */    adc_data_alignment_config(ADC_DATAALIGN_RIGHT);    /* ADC channel length config */    adc_channel_length_config(ADC_INSERTED_CHANNEL, 4U);    /* ADC inserted channel config */    adc_inserted_channel_config(0U, ADC_CHANNEL_0, ADC_SAMPLETIME_55POINT5);    adc_inserted_channel_config(1U, ADC_CHANNEL_1, ADC_SAMPLETIME_55POINT5);    adc_inserted_channel_config(2U, ADC_CHANNEL_2, ADC_SAMPLETIME_55POINT5);    adc_inserted_channel_config(3U, ADC_CHANNEL_3, ADC_SAMPLETIME_55POINT5);    /* ADC external trigger enable */    adc_external_trigger_config(ADC_INSERTED_CHANNEL, ENABLE);    adc_interrupt_enable(ADC_INT_EOIC);    /* enable ADC interface */    adc_enable();    delay_ms(1U);    /* ADC calibration and reset calibration */    adc_calibration_enable();    nvic_irq_enable(ADC_CMP_IRQn, 1);}//ADC中断函数void ADC_CMP_IRQHandler(void){/* clear the ADC interrupt or status flag */  adc_interrupt_flag_clear(ADC_INT_EOIC);  ADC_Value_Inject[0] = adc_inserted_data_read(ADC_INSERTED_CHANNEL_0); ADC_Value_Inject[1] = adc_inserted_data_read(ADC_INSERTED_CHANNEL_1); ADC_Value_Inject[2] = adc_inserted_data_read(ADC_INSERTED_CHANNEL_2); ADC_Value_Inject[3] = adc_inserted_data_read(ADC_INSERTED_CHANNEL_3);}//主函数配置void main(void){/* system clocks configuration */ rcu_config_inject(); /* GPIO configuration */ gpio_config_inject(); /* TIMER configuration */ timer_config_inject(); /* ADC configuration */ adc_config_inject(); /* enable TIMER2 */ timer_enable(TIMER2);}

目前这个例程做的是1ms触发ADC转换，转换完成后会触发ADC中断，在中断里面可直接读取ADC转换值。读取ADC也可节省mcu的效率