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lib/utils/stdout_helpers: Make mp_hal_stdout_tx_strn_cooked efficient. 

To reduce the number of calls to mp_hal_stdout_tx_strn and improve the
overall throughput of printing data.  This implementation is taken from
ports/stm32/mphalport.c.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2021-07-06 11:23:21 +10:00
parent 3d9af87721
commit 20a6044952
1 changed files with 41 additions and 5 deletions
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46
lib/utils/stdout_helpers.c
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@ -1,6 +1,30 @@
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 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 <string.h>
#include <unistd.h>
#include "py/mpconfig.h"
#include "py/mphal.h" #include "py/mphal.h"
/* /*
@ -10,13 +34,25 @@
*/ */
// Send "cooked" string of given length, where every occurrence of // Send "cooked" string of given length, where every occurrence of
// LF character is replaced with CR LF. // LF character is replaced with CR LF ("\n" is converted to "\r\n").
// This is an optimised version to reduce the number of calls made
// to mp_hal_stdout_tx_strn.
void mp_hal_stdout_tx_strn_cooked(const char *str, size_t len) { void mp_hal_stdout_tx_strn_cooked(const char *str, size_t len) {
const char *last = str;
while (len--) { while (len--) {
if (*str == '\n') { if (*str == '\n') {
mp_hal_stdout_tx_strn("\r", 1); if (str > last) {
mp_hal_stdout_tx_strn(last, str - last);
}
mp_hal_stdout_tx_strn("\r\n", 2);
++str;
last = str;
} else {
++str;
} }
mp_hal_stdout_tx_strn(str++, 1); }
if (str > last) {
mp_hal_stdout_tx_strn(last, str - last);
} }
} }