Hi
/*
* SPI Master library for Arduino Zero.
* Copyright (c) 2015 Arduino LLC
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _SPI_H_INCLUDED
show original
Exist a way for obtain same speed without changing the IDE file?
Second question.
About Print, ex TFT.print() file.print() serial.print()https://github.com/arduino/ArduinoCore-samd/blob/master/cores/arduino/Print.cpp
There are 2 function ? One for print String from ram and one from flash ?
is right if i say:
print("hello")
print(F"hello")
Naturally, all this is intended with ARM SAMD
No, booth of this are const = Flash.
size_t Print::print(const __FlashStringHelper *ifsh)
This post read 880 time and nobody gives me advice?
#define F(string_literal) (reinterpret_cast<const __FlashStringHelper *>(PSTR(string_literal)))
I found this but I do not understand.
westfw
February 23, 2020, 3:42am
4
No, booth of this are const = Flash. Explain me.
size_t Print::print(const __FlashStringHelper *ifsh)
They would be different on an AVR, so both versions exist for the sake of compatibility.
// New programs should use SPI.beginTransaction to set the SPI clock
See SPI - Arduino Reference
Max speeed, using original library is 12mhz