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/* Megumin LED display firmware
* Copyright (C) 2018 Sebastian Götte <code@jaseg.net>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ADC_H__
#define __ADC_H__
#include "global.h"
#include "8b10b.h"
struct adc_measurements {
int16_t adc_vcc_mv;
int16_t adc_temp_celsius_tenths;
int16_t adc_vmeas_a_mv;
int16_t adc_vmeas_b_mv;
int16_t adc_mean_a_mv;
int16_t adc_mean_b_mv;
int16_t adc_mean_diff_mv;
};
enum channel_mask {
MASK_VMEAS_A = ADC_CHSELR_CHSEL0,
MASK_VMEAS_B = ADC_CHSELR_CHSEL1
};
enum adc_mode {
ADC_UNINITIALIZED,
ADC_MONITOR,
ADC_SCOPE
};
enum sampling_mode {
SAMPLE_FAST = 0
};
/* The weird order is to match the channels' order in the DMA buffer. Due to some configuration mistake I can't be
bothered to fix, the DMA controller outputs ADC measurements off-by-one into the output buffer. */
enum adc_channels {
VREF_CH,
VMEAS_A,
VMEAS_B,
TEMP_CH,
NCH
};
struct adc_state {
enum adc_mode adc_mode;
int adc_oversampling;
int mean_aggregate_len;
struct {
int threshold_mv;
int hysteresis_mv;
int debounce_cycles;
int symbol;
int base_interval_cycles;
/* private stuff */
int bit;
int len_ctr;
int committed_len_ctr;
int debounce_ctr;
struct state_8b10b_dec rx8b10b;
} detector;
/* private stuff */
int ovs_count; /* oversampling accumulator sample count */
uint32_t adc_aggregate[NCH]; /* oversampling accumulator */
uint32_t mean_aggregate_ctr;
uint32_t mean_aggregator[3];
};
extern volatile struct adc_state adc_state;
extern volatile uint16_t adc_buf[ADC_BUFSIZE];
extern volatile struct adc_measurements adc_data;
void adc_init(void);
void adc_configure_scope_mode(uint8_t channel_mask, int sampling_interval_ns);
void adc_configure_monitor_mode(int oversampling, int ivl_us, int mean_aggregate_len);
#endif/*__ADC_H__*/
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