51 lines
818 B
C
51 lines
818 B
C
/*
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* misc.c
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*
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* Copyright (C) 2019-2020 Sylvain Munaut <tnt@246tNt.com>
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include "config.h"
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#include "misc.h"
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struct misc {
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uint32_t warmboot;
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uint32_t gpio;
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uint32_t e1_led;
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uint32_t _rsvd;
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struct {
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uint16_t tx;
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uint16_t rx;
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} e1_tick[2];
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uint32_t gps;
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uint32_t time;
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uint32_t pdm[8];
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} __attribute__((packed,aligned(4)));
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static volatile struct misc * const misc_regs = (void*)(MISC_BASE);
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static const int pdm_bits[5] = { 12, 12, 8, 8, 8 };
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void
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pdm_set(int chan, bool enable, unsigned value, bool normalize)
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{
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if (normalize)
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value >>= (16 - pdm_bits[chan]);
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if (enable)
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value |= 0x80000000;
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misc_regs->pdm[chan] = value;
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}
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uint16_t
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e1_tick_read(void)
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{
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return misc_regs->e1_tick[0].tx;
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}
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