MC100/Applications/bsp/adc.c

#include "bsp/adc.h"
#include "libs/task.h"
static void _gpio_init(void);
static void _adc_insert_chan_init(void);
static void _adc_regular_chan_init(void);

void adc_init(void){
	/* init adc input gpio */
	_gpio_init();
    /* enable ADC1 clock */
    rcu_periph_clock_enable(RCU_ADC0);
    /* config ADC clock */
    rcu_adc_clock_config(RCU_CKADC_CKAPB2_DIV4); //APB2 clk 120M, adc clk 30M
    /* ADC mode config */
    adc_mode_config(ADC_MODE_FREE); 
    /* ADC special function config */
    adc_special_function_config(ADC0, ADC_SCAN_MODE, DISABLE);
    adc_special_function_config(ADC0, ADC_CONTINUOUS_MODE, DISABLE);  
    /* ADC data alignment config */
    adc_data_alignment_config(ADC0, ADC_DATAALIGN_RIGHT);
	/* init insert chans*/
	_adc_insert_chan_init();
	/* init regular chans*/
	_adc_regular_chan_init();
    /* enable ADC interface */
    adc_enable(ADC0);
    delay_ms(1);
    /* ADC calibration and reset calibration */
    adc_calibration_enable(ADC0);

	nvic_irq_enable(ADC0_1_IRQn, 0, 0);
}

static void _gpio_init(void) {
	rcu_periph_clock_enable(RCU_GPIOA);
	rcu_periph_clock_enable(RCU_GPIOB);
	gpio_init(GPIOA, GPIO_MODE_AIN, GPIO_OSPEED_50MHZ, GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7);
	gpio_init(GPIOB, GPIO_MODE_AIN, GPIO_OSPEED_50MHZ, GPIO_PIN_0|GPIO_PIN_1);
}

static void _adc_insert_chan_init(void) {

	adc_discontinuous_mode_config(ADC0, ADC_INSERTED_CHANNEL, 1); //每次转化一个
    /* ADC channel length config */
    adc_channel_length_config(ADC0, ADC_INSERTED_CHANNEL, 2);
    /* ADC inserted channel config */
    adc_inserted_channel_config(ADC0, 0, VBUS_I_CHAN, ADC_SAMPLETIME_7POINT5);
    adc_inserted_channel_config(ADC0, 1, VBUS_I_CHAN, ADC_SAMPLETIME_7POINT5);
    /* ADC trigger config */
    adc_external_trigger_source_config(ADC0, ADC_INSERTED_CHANNEL, ADC0_1_EXTTRIG_INSERTED_T1_CH0); 
#if 0
    /* ADC external trigger enable */
    adc_external_trigger_config(ADC0, ADC_INSERTED_CHANNEL, ENABLE);
    
    /* clear the ADC flag */
    adc_interrupt_flag_clear(ADC0, ADC_INT_FLAG_EOC);
    adc_interrupt_flag_clear(ADC0, ADC_INT_FLAG_EOIC);
    /* enable ADC interrupt */
    adc_interrupt_enable(ADC0, ADC_INT_EOIC);
#endif
}

static void _adc_regular_chan_init(void) {
	adc_discontinuous_mode_config(ADC0, ADC_REGULAR_CHANNEL, 1); //每次转化一个
	/* ADC channel length config */
	adc_channel_length_config(ADC0, ADC_REGULAR_CHANNEL, 1);
	adc_external_trigger_config(ADC0, ADC_REGULAR_CHANNEL, DISABLE);
	adc_regular_channel_config(ADC0, 0, MOTOR_TEMP_CHAN, ADC_SAMPLETIME_55POINT5);
	adc_regular_channel_config(ADC0, 1, HANDLERBAR_CHAN, ADC_SAMPLETIME_55POINT5);
	adc_regular_channel_config(ADC0, 2, VBUS_V_CHAN, ADC_SAMPLETIME_55POINT5);
	adc_regular_channel_config(ADC0, 3, W_PHASE_V_CHAN, ADC_SAMPLETIME_55POINT5);
	adc_regular_channel_config(ADC0, 4, V_PHASE_V_CHAN, ADC_SAMPLETIME_55POINT5);
	adc_regular_channel_config(ADC0, 5, U_PHASE_V_CHAN, ADC_SAMPLETIME_55POINT5);
	adc_regular_channel_config(ADC0, 6, W_PHASE_I_CHAN, ADC_SAMPLETIME_55POINT5);
	adc_regular_channel_config(ADC0, 7, V_PHASE_I_CHAN, ADC_SAMPLETIME_55POINT5);
	adc_regular_channel_config(ADC0, 8, U_PHASE_I_CHAN, ADC_SAMPLETIME_55POINT5);
}

s32 adc_sample_insert_chan(void) {
	adc_interrupt_disable(ADC0, ADC_INT_EOIC);
	adc_external_trigger_config(ADC0, ADC_INSERTED_CHANNEL, DISABLE);
	adc_software_trigger_enable(ADC0, 0);
	while(SET != adc_inserted_data_read(ADC0, 0));
	return adc_inserted_data_read(ADC0, 0);
}

void adc_start_insert_chan(void) {
    /* ADC external trigger enable */
    adc_external_trigger_config(ADC0, ADC_INSERTED_CHANNEL, ENABLE);
    
    /* clear the ADC flag */
    adc_interrupt_flag_clear(ADC0, ADC_INT_FLAG_EOC);
    adc_interrupt_flag_clear(ADC0, ADC_INT_FLAG_EOIC);
    /* enable ADC interrupt */
    adc_interrupt_enable(ADC0, ADC_INT_EOIC);
}

s32 adc_sample_regular_chan(int chan, int times) {
	int value = 0;
	int count = 0;
	int min = 0xFFFFF;
	int max = -0xFFFFF;
	u64 start_time;
	while(count < times){
restart:		
		start_time = get_mseconds();
		adc_software_trigger_enable(ADC0, ADC_REGULAR_CHANNEL);
    	while(SET != adc_flag_get(ADC0, ADC_FLAG_EOC)){
			if (get_mseconds() - start_time >= 2){
				goto restart;
			}
		};
    	int one = adc_regular_data_read(ADC0);
		adc_flag_clear(ADC0, ADC_FLAG_EOC);		
		value += (one & 0xFFF);
		count ++;
		if (one > max){
			max = one;
		}
		if (one < min) {
			min = one;
		}
	}
	if (times <= 2) {
		return value/times;
	}
	return (value - min - max)/(times-2);
	
}