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/*
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdio.h>
#include "hardware/uart.h"
#if defined(__unix) || defined(__APPLE__)
#define _XOPEN_SOURCE 600 /* for ONLCR */
#define __BSD_VISIBLE 1 /* for ONLCR in *BSD */
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#include <stdlib.h>
#ifndef FNONBLOCK
#define FNONBLOCK O_NONBLOCK
#endif
struct termios _tty;
static tcflag_t _res_oflg = 0;
static tcflag_t _res_lflg = 0;
void _resettty(void) {
if (!isatty(STDIN_FILENO))
return;
/* reset tty: */
_tty.c_oflag = _res_oflg;
_tty.c_lflag = _res_lflg;
tcsetattr(STDIN_FILENO, TCSADRAIN, &_tty);
}
void _inittty(void) {
if (!isatty(STDIN_FILENO))
return;
/* save tty: */
tcgetattr(STDIN_FILENO, &_tty);
_res_oflg = _tty.c_oflag;
_res_lflg = _tty.c_lflag;
/* set raw: */
_tty.c_lflag &= ~(ICANON | ICRNL);// | ISIG);
//_tty.c_oflag &= ~ONLCR;
tcsetattr(STDIN_FILENO, TCSANOW, &_tty);
fcntl(STDIN_FILENO, F_SETFL, FNONBLOCK);
atexit(_resettty);
}
#else
void _inittty() {}
#endif
typedef struct {
bool dummy;
} uart_hw_t;
uart_inst_t *const uart0;
uart_inst_t *const uart1;
static int _nextchar = EOF;
static bool _peekchar() {
if (_nextchar == EOF) {
_nextchar = getchar();
}
return _nextchar != EOF;
}
uint uart_init(uart_inst_t *uart, uint baud_rate) {
_inittty();
return baud_rate;
}
size_t uart_is_writable(uart_inst_t *uart) {
return 1;
}
// If returns 0, no data is available to be read from UART.
// If returns nonzero, at least that many bytes can be written without blocking.
size_t uart_is_readable(uart_inst_t *uart) {
return _peekchar() ? 1 : 0;
}
// Write len bytes directly from src to the UART
void uart_write_blocking(uart_inst_t *uart, const uint8_t *src, size_t len) {
for (size_t i = 0; i < len; i++) {
uart_putc(uart, src[i]);
}
}
// Read len bytes directly from the UART to dst
void uart_read_blocking(uart_inst_t *uart, uint8_t *dst, size_t len) {
for (size_t i = 0; i < len; i++) {
dst[i] = uart_getc(uart);
}
}
// ----------------------------------------------------------------------------
// UART-specific operations and aliases
void uart_putc(uart_inst_t *uart, char c) {
putchar(c);
}
void uart_puts(uart_inst_t *uart, const char *s) {
puts(s);
}
char uart_getc(uart_inst_t *uart) {
while (!_peekchar()) {
tight_loop_contents();
}
char rc = (char) _nextchar;
_nextchar = EOF;
return rc;
}
void uart_default_tx_wait_blocking() {
}
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