.. vim:   noexpandtab fileencoding=utf-8 nomodified   wrap textwidth=270 foldmethod=marker foldmarker={{{,}}} foldcolumn=4 ruler showcmd lcs=tab\:|- list tabstop=8 noexpandtab nosmarttab softtabstop=0 shiftwidth=0


:date: 2023.08.24 03:20:17
:tags: HowTo
:authors: Gilhad
:summary: Arduino
:title: Arduino
:nice_title: |logo| %title% |logo|

%HEADER%


Arduino Serial až 2Mb/s (ale 115.200 je lepší)
--------------------------------------------------------------------------------

* ale musely by se přepsat knihovny, aby stíhaly bufferovat `<https://arduino.stackexchange.com/questions/296/how-high-of-a-baud-rate-can-i-go-without-errors>`__
	* At 2 Mb/s, each byte transmission takes **80 CPU** cycles
	* takže pro **6309** by to bylo asi **10 cyklů** - nestíhá interrupty, nejspíš prostě nestíhá nic a budu rád za 115.200 na několika kanálech (aka 2 seriáky+vnitřní sběrnice k Polux3+ nebo tak něco)

divmod10() : a fast replacement for /10 and %10 (unsigned)
--------------------------------------------------------------------------------

`<https://forum.arduino.cc/t/divmod10-a-fast-replacement-for-10-and-10-unsigned/163586/90>`__

no delay() blink
--------------------------------------------------------------------------------

.. code::

	unsigned long previous_millis, interval = 1000UL;
	if ( (current_millis - previous_millis) >= interval) {
		previous_millis = current_millis;
		// its the time
	};

Arduino Micro Serial
--------------------------------------------------------------------------------

* Pro výstup na **Serial** používat `if (Serial.availableForWrite()) {Serial.print(F("whatever");};`
* Pro monitorování pomocí `screen` nezapomenout shodit `RTS` a `DTR` třeba pomocí `close_Serial` (`<close_Serial.c>`__)

.. code::

	#include <unistd.h>
	#include <fcntl.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <sys/ioctl.h> 
	
	int main(int argc, char *argv[]) {
		// Check if the correct number of command-line arguments is provided
		if (argc != 2 ) {
			fprintf(stderr, "Usage: %s <filename>\n", argv[0]);
			fprintf(stderr, "  %s /dev/ttyACM0 - close USB Serial for Arduino on the port\n", argv[0]);
			return 1; // Return an error code
		}
		int fd;
		fd = open(argv[1],O_RDWR | O_NOCTTY );//Open Serial Port
	  
		int RTS_flag;
		RTS_flag = TIOCM_RTS;
	
		int DTR_flag;
		DTR_flag = TIOCM_DTR;
	
	//	ioctl(fd,TIOCMBIS,&RTS_flag);//Set RTS pin
	//	ioctl(fd,TIOCMBIS,&DTR_flag);//Set DTR pin
	//	getchar();
	
		ioctl(fd,TIOCMBIC,&RTS_flag);//Clear RTS pin
		ioctl(fd,TIOCMBIC,&DTR_flag);//Clear DTR pin
		close(fd);
	}

nebo `<close_Serial.py>`__

.. code::

	#!/usr/bin/python -u
	# vim: fileencoding=utf-8:nomodified:nowrap:textwidth=0:foldmethod=marker:foldcolumn=4:ruler:showcmd:lcs=tab\:|- list:tabstop=8:noexpandtab:nosmarttab:softtabstop=0:shiftwidth=0
	
	import serial
	import sys
	
	# Check if the correct number of command-line arguments is provided
	if not len(sys.argv) in {2,3}:
		print("Usage: {} <filename> [baudrate]".format(sys.argv[0]))
		print("	{} /dev/ttyACM0 - close USB Serial for Arduino on the port".format(sys.argv[0]))
		sys.exit(1)  # Exit with a non-zero error code
	
	# Get the filename from the command-line argument
	baudrate=115200
	filename = sys.argv[1]
	if len(sys.argv) > 2:
		baudrate=sys.argv[2]
	
	# Open the serial port
	ser = serial.Serial(filename, baudrate, xonxoff=False , rtscts=True , dsrdtr=True )
	ser.rts=False
	ser.dtr=False

* A ještě líp, použít `picocom -b $(SPEED) --flow n  --noreset --hangup --quiet -s cat $(PORT);echo`, který tu linku uavře a `C-a` `C-s` se tam dá vložit soubor. (A netestovat nic, prostě `Serial.print("blabla");`)

How to find out all #define used by arduino-cli in compile?
--------------------------------------------------------------------------------

`<https://arduino.stackexchange.com/questions/94806/how-to-find-out-all-define-used-by-arduino-cli-in-compile/>`__

.. code:: make

	define:		## dump all #define to defines.dump
		@make |grep g++|grep .ino.cpp.o|sed "s/-o .*/-E -dM -o defines.dump/"|sh
		@sort defines.dump >defines.d
		@mv defines.d defines.dump
		@echo "defines.dump created"