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Diffstat (limited to 'center_fw/src/adc.h')
| -rw-r--r-- | center_fw/src/adc.h | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/center_fw/src/adc.h b/center_fw/src/adc.h new file mode 100644 index 0000000..906cb7f --- /dev/null +++ b/center_fw/src/adc.h @@ -0,0 +1,96 @@ +/* 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); + +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__*/ |