GD32E230 ADC注入通道
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2022-07-04 20:07:43
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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
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