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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"
#include "protocol.h"
struct adc_measurements {
int16_t vcc_mv;
int16_t temp_celsius_tenths;
int16_t vmeas_a_mv;
int16_t vmeas_b_mv;
int16_t mean_a_mv;
int16_t mean_b_mv;
int16_t 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 bit_detector_st {
int hysteresis_mv;
int sync;
int base_interval_cycles;
struct proto_rx_st rx_st;
/* private stuff */
int last_bit;
int len_ctr;
int committed_len_ctr;
struct state_8b10b_dec rx8b10b;
};
struct adc_state {
enum adc_mode adc_mode;
int dma_isr_duration;
struct bit_detector_st det_st;
/* private stuff */
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(const struct command_if_def *cmd_if, int ivl_us);
void bit_detector(struct bit_detector_st *st, int a);
void receive_bit(struct bit_detector_st *st, int bit);
void blank(void);
void unblank(int new_bit);
#endif/*__ADC_H__*/
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