mirror of
https://github.com/halleysfifthinc/AVCLAN-Mockingboard.git
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Allen Hill
78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
// copyright (C) 2006 Marcin Slonicki <marcin@softservice.com.pl>
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// copyright (C) 2007 Louis Frigon
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// Copyright (C) 2015 Allen Hill <allenofthehills@gmail.com>
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// SPDX-License-Identifier: GPL-3.0-or-later
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#pragma once
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#include <stdint.h>
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#include "avclan_defs.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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// One-time bring-up of the bus hardware. Leaves the bus idle and TX unmuted.
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void AVCLAN_busInit(void);
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// Mute/unmute device TX. "Muted" means we still listen, we just don't ACK or
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// transmit.
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void AVCLAN_muteDevice(bool mute);
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bool AVCLAN_ismuted(void);
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// True when there is activity on the bus (something is driving it).
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bool AVCLAN_busActive(void);
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// Bus-transaction guard: quiesce the target's other async sources around a bus
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// read/send so framing isn't disturbed, then restore them. May be a no-op on a
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// target without such contention.
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void AVCLAN_stopEvent(void);
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void AVCLAN_startEvent(void);
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// Start-bit handling, factored out of read/sendframe so the framing layer holds
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// no bus-timing or hardware-recovery logic.
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// - AVCLAN_readstartbit waits for and validates an incoming start bit, doing
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// any target-specific bus recovery; see avclan_readerr_t.
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// - AVCLAN_sendstartbit acquires the bus and emits a start bit; returns false
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// if the bus was busy.
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avclan_readerr_t AVCLAN_readstartbit(void);
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bool AVCLAN_sendstartbit(void);
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// Per-symbol I/O. The send* helpers return the even parity of the bits sent;
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// the read* helpers return the even parity of the bits read.
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void AVCLAN_sendbit(avclan_bit_t bit);
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void AVCLAN_sendbit_ACK(void);
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uint8_t AVCLAN_readbit_ACK(void);
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avclan_bit_t AVCLAN_sendbitsi(const uint8_t *bits, int8_t len);
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avclan_bit_t AVCLAN_sendbitsl(const uint16_t *bits, int8_t len);
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avclan_bit_t AVCLAN_sendbyte(const uint8_t *byte);
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uint8_t AVCLAN_readbitsi(uint8_t *bits, uint8_t len);
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uint8_t AVCLAN_readbitsl(uint16_t *bits, int8_t len);
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uint8_t AVCLAN_readbyte(uint8_t *byte);
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#define AVCLAN_sendbits(bits, len) \
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_Generic((bits), \
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const uint16_t *: AVCLAN_sendbitsl, \
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uint16_t *: AVCLAN_sendbitsl, \
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const uint8_t *: AVCLAN_sendbitsi, \
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uint8_t *: AVCLAN_sendbitsi)(bits, len)
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#define AVCLAN_readbits(bits, len) \
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_Generic((bits), \
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const uint16_t *: AVCLAN_readbitsl, \
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uint16_t *: AVCLAN_readbitsl, \
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const uint8_t *: AVCLAN_readbitsi, \
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uint8_t *: AVCLAN_readbitsi)(bits, len)
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#ifndef NDEBUG
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// Sample and dump bus bit timing over the serial link (REPL `M`).
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void AVCLan_Measure(void);
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#endif
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#ifdef __cplusplus
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}
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#endif
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