107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
/*
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* Author: username
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* Date: 2024
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* filename: ADC.c
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* description: module_purpose
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*/
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#include "ADC.h"
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#include "RegEdit.h"
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#include "avr/io.h"
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static uint8_t porta_out;
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static uint8_t porta_dir;
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static bool IsInvalidPin(uint8_t pin_num){
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if(pin_num > 7){
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return true;
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}
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return false;
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}
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void ADC_Init(uint8_t pin_num)
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{
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//Save the porta status.
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porta_out = PORTA.OUT;
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porta_dir = PORTA.DIR;
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if(IsInvalidPin(pin_num)){return;}
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//set the direction to input
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RegEdit_SetBit((void *) &PORTA.DIRCLR, pin_num);
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//Disable the pull-up resistor
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RegEdit_SetBit((void *) &PORTA.OUTCLR, pin_num);
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//Disable input buffer
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//We do some kind of nasty address addition but it saves
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//memory and means we don't need a switch statement.
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//PORT_ISC_INPUT_DISABLE_gc
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RegEdit_SetBit(
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(void *) (&PORTA.PIN0CTRL)+pin_num,
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PORT_ISC_INPUT_DISABLE_gc
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);
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/*
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RegEdit_OR_Num(
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(void *) (&PORTA.PIN0CTRL)+pin_num,
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PORT_ISC_INPUT_DISABLE_gc
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);*/
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//Ensure we use full 10bit resolution
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RegEdit_ClearBit((void *) &ADC0.CTRLA, 2);
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//Use VDD as our voltage refernce.
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RegEdit_SetBit((void *) &ADC0.CTRLC, 4);
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}
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void ADC_Enable(uint8_t pin_num)
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{
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if(IsInvalidPin(pin_num)){return;}
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//Use muxpos to select pins for ADC to connect.
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RegEdit_OR_Num((void *) &ADC0.MUXPOS, pin_num);
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//Set the enable bit in the CTRLA register
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RegEdit_SetBit((void *) &ADC0.CTRLA, 0);
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}
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void ADC_Disable()
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{
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//Set for no ADC connections.
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RegEdit_ClearRegister((void *) &ADC0.MUXPOS);
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//Clear the enable ADC flag
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RegEdit_ClearBit((void *) &ADC0.CTRLA, 0);
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//Restore the port registers
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PORTA.OUT = porta_out;
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PORTA.DIR = porta_dir;
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}
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uint16_t ADC_ReadValue_Impl(uint8_t pin_num)
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{
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RegEdit_SetNum((void *) &ADC0.COMMAND, ADC_STCONV_bm);
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/* Wait until ADC conversion done */
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//while ( !(ADC0.INTFLAGS & ADC_RESRDY_bm) )
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//while(!(RegEdit_IsBitSet((void *) &ADC0.INTFLAGS, ADC_RESSEL_bm)))
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while ( !(ADC0.INTFLAGS & ADC_RESRDY_bm) )
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{
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;
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}
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/* Clear the interrupt flag by writing 1: */
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ADC0.INTFLAGS = ADC_RESRDY_bm;
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return (uint16_t) ADC0.RES;
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}
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//Set the default for the function pointer.
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uint16_t (*ADC_ReadValue)(uint8_t pin_num) = ADC_ReadValue_Impl;
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