57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
/*
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*
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* Copyright (c) 2019
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* Author: Daniele Lacamera <root@danielinux.net>
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* GPL2.0
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*/
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#include <stdint.h>
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#include "adc.h"
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#include "system.h"
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int adc_init(void)
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{
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int i;
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uint32_t val;
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/* Enable clock */
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APB2_CLOCK_ER |= ADC1_APB2_CLOCK_ER_VAL;
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/* Power off */
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ADC1_CR2 &= ~(ADC_CR2_EN);
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/* Set common clock prescaler */
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ADC_COM_CCR &= ~(0x03 << 16);
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/* Disable scan mode */
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ADC1_CR1 &= ~(ADC_CR1_SCAN);
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/* Set one-shot (disable continuous mode) */
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ADC1_CR2 &= ~(ADC_CR2_CONT);
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/* Set sample time for all channels */
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val = ADC1_SMPR1;
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for (i = 0; i < 10; i++) {
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val |= ADC_SMPR_SMP_480CYC << (i * 3);
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ADC1_SMPR1 = val;
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val = ADC1_SMPR2;
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for (i = 10; i < 18; i++)
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val |= ADC_SMPR_SMP_480CYC << ((i-10) * 3);
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}
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ADC1_SMPR2 = val;
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ADC1_CR2 &= ~(ADC_CR2_EN);
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return 0;
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}
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void adc_pin_val(uint32_t ch, uint16_t *val)
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{
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ADC1_SQR3 = ch;
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ADC1_CR2 |= ADC_CR2_EN;
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ADC1_CR2 |= ADC_CR2_SWSTART;
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while (ADC1_CR2 & ADC_CR2_SWSTART);;
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while ((ADC1_SR & ADC_SR_EOC) == 0);;
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*val= ADC1_DR;
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printf("Channel %d val %hu\r\n", ch, *val);
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ADC1_SQR3 = 0;
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}
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