Center firmware WIP

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__*/