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/*
* Copyright © 2017-2022 The Crust Firmware Authors.
* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
*/
#ifndef DRIVERS_SERIAL_H
#define DRIVERS_SERIAL_H
#include <stdbool.h>
#if CONFIG(SERIAL)
/**
* Read a character from the UART.
*
* @return The character read, or 0 if no character is available.
*/
char serial_getc(void);
void serial_putc(char c);
void serial_puts(const char *s);
/**
* Initialize the UART.
*/
void serial_init(void);
/**
* Verify that the UART is ready to use.
*
* This function must be called before performing any I/O. Other serial I/O
* functions may only be called if this function returns true.
*/
bool serial_ready(void);
#else
static inline char
serial_getc(void)
{
return 0;
}
static inline void
serial_putc(char c UNUSED)
{
}
static inline void
serial_puts(const char *s UNUSED)
{
}
static inline void
serial_init(void)
{
}
static inline bool
serial_ready(void)
{
return false;
}
#endif
#endif /* DRIVERS_SERIAL_H */
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