adc.c

/*
 * adc.c
 *
 *  Created on: 06/10/2016
 *      Author: Evandro
 */

#include "adc.h"

void adc_init(uint8_t res)
{
	// Enable clocks
	SIM_SCGC6 |= SIM_SCGC6_ADC0_MASK;	// ADC 0 clock

	// Configure ADC
	ADC0_CFG1 = 0; // Reset register

	ADC0_CFG1 |= (ADC_CFG1_MODE( res )  |  	// 16 bits mode
				  ADC_CFG1_ADICLK(0)|	// Input Bus Clock (20-25 MHz out of reset (FEI mode))
				  ADC_CFG1_ADIV(1)) ;	// Clock divide by 2 (10-12.5 MHz)

	ADC0_SC3 = 0; // Reset SC3

	ADC0_SC1A |= ADC_SC1_ADCH(31); // Disable module
}


uint16_t adc_read(uint16_t ch)
{
	//ADC0_SC1A = (ch & ADC_SC1_ADCH_MASK) | (ADC0_SC1A & (ADC_SC1_AIEN_MASK | ADC_SC1_DIFF_MASK));     // Write to SC1A to start conversion
	ADC0_SC1A = ch & ADC_SC1_ADCH_MASK; //Write to SC1A to start conversion
	while(ADC0_SC2 & ADC_SC2_ADACT_MASK); 	 // Conversion in progress
	while(!(ADC0_SC1A & ADC_SC1_COCO_MASK)); // Run until the conversion is complete
	return ADC0_RA;
}