circuitpython/ports/pic16bit/pic16bit_mphal.c
Damien George 38e7b842c6 ports: Implement simple write polling for stdout.
This is a best-effort implementation of write polling.  It's difficult to
do correctly because if there are multiple output streams (eg UART and USB
CDC) then some may not be writeable while others are.  A full solution
should also have a return value from mp_hal_stdout_tx_strn(), returning the
number of bytes written to the stream(s).  That's also hard to define.

The renesas-ra and stm32 ports already implement a similar best-effort
mechanism for write polling.

Fixes issue #11026.

Signed-off-by: Damien George <damien@micropython.org>
2023-03-23 13:51:17 +11:00

94 lines
2.6 KiB
C

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2015 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include "py/stream.h"
#include "py/mphal.h"
#include "board.h"
static int interrupt_char;
void mp_hal_init(void) {
MP_STATE_PORT(keyboard_interrupt_obj) = mp_obj_new_exception(&mp_type_KeyboardInterrupt);
}
mp_uint_t mp_hal_ticks_ms(void) {
// TODO
return 0;
}
void mp_hal_delay_ms(mp_uint_t ms) {
// tuned for fixed CPU frequency
for (int i = ms; i > 0; i--) {
for (volatile int j = 0; j < 5000; j++) {
}
}
}
void mp_hal_set_interrupt_char(int c) {
interrupt_char = c;
}
uintptr_t mp_hal_stdio_poll(uintptr_t poll_flags) {
uintptr_t ret = 0;
if ((poll_flags & MP_STREAM_POLL_RD) && uart_rx_any()) {
ret |= MP_STREAM_POLL_RD;
}
if (poll_flags & MP_STREAM_POLL_WR) {
ret |= MP_STREAM_POLL_WR;
}
return ret;
}
int mp_hal_stdin_rx_chr(void) {
for (;;) {
if (uart_rx_any()) {
return uart_rx_char();
}
}
}
void mp_hal_stdout_tx_str(const char *str) {
mp_hal_stdout_tx_strn(str, strlen(str));
}
void mp_hal_stdout_tx_strn(const char *str, size_t len) {
for (; len > 0; --len) {
uart_tx_char(*str++);
}
}
void mp_hal_stdout_tx_strn_cooked(const char *str, size_t len) {
for (; len > 0; --len) {
if (*str == '\n') {
uart_tx_char('\r');
}
uart_tx_char(*str++);
}
}
MP_REGISTER_ROOT_POINTER(mp_obj_t keyboard_interrupt_obj);