Arduino notes - Revision history

Ted at 20:08, 13 June 2022

2022-06-13T20:08:57Z

2018-05-21T18:55:37Z

Arduino Wire Library

2018-05-21T15:57:01Z

2018-05-21T14:38:43Z

2018-04-23T19:16:56Z

2018-04-23T19:14:03Z

2018-04-23T19:03:12Z

2018-04-23T19:02:40Z

2018-04-23T17:07:14Z

2018-04-23T15:15:25Z

← Older revision		Revision as of 20:08, 13 June 2022
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	</pre>		</pre>

		+
		+	2022-06-13
		+
		+	OpenMV IDE and Arduino Nano:
		+	<ul>
		+	* https://blog.arduino.cc/2021/08/24/power-of-python-for-arduino-nano-rp2040-connect-and-nano-33-ble/
		+	</ul>

← Older revision		Revision as of 18:55, 21 May 2018
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	</pre>		</pre>

		+
		+
		+	According to the oscilloscope the I2C communications are running at about 192kHz, a little fast. Here is documentation at the Arduino site about setting the I2C clock rate:
		+
		+	* https://www.arduino.cc/en/Reference/WireSetClock . . . Wire.setClock() class method not found on localhost!
		+
		+	Another place where SCL frequency may be set . . .
		+
		+	<pre>
		+	user@localhost:/usr/share/arduino/libraries/Wire$ grep -nr lock ./*
		+	./Wire.cpp:84: // perform blocking read into buffer
		+	./Wire.cpp:139: // transmit buffer (blocking)
		+	./utility/twi.c:85: SCL Frequency = CPU Clock Frequency / (16 + (2 * TWBR))
		+	./utility/twi.c:467: // sends ack and stops interface for clock stretching
		+	</pre>
		+
		+
		+
		+	<!-- comment -->
		+
		+	== References ==

	<!-- comment -->		<!-- comment -->

← Older revision		Revision as of 15:57, 21 May 2018
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		+	== Arduino Wire Library ==
		+
		+	2018-05-21 - Monday, looking at /usr/share/arduino/libraries/Wire/utility/twi.c, routine twi_writeTo() error codes:
		+
		+	<pre>
		+	177 /*
		+	178 * Function twi_writeTo
		+	179 * Desc attempts to become twi bus master and write a
		+	180 * series of bytes to a device on the bus
		+	181 * Input address: 7bit i2c device address
		+	182 * data: pointer to byte array
		+	183 * length: number of bytes in array
		+	184 * wait: boolean indicating to wait for write or not
		+	185 * sendStop: boolean indicating whether or not to send a stop at the end
		+	186 * Output 0 .. success
		+	187 * 1 .. length to long for buffer
		+	188 * 2 .. address send, NACK received
		+	189 * 3 .. data send, NACK received
		+	190 * 4 .. other twi error (lost bus arbitration, bus error, ..)
		+	191 */
		+	192 uint8_t twi_writeTo(uint8_t address, uint8_t* data, uint8_t length, uint8_t wait, uint8_t sendStop)
		+	193 {
		+	194 uint8_t i;
		+	195
		+	196 // ensure data will fit into buffer
		+	197 if(TWI_BUFFER_LENGTH < length){
		+	198 return 1;
		+	199 }
		+	.
		+	.
		+	.
		+	</pre>
		+
		+
		+	<!-- comment -->
		+
		+
		+
		+
		+	<!-- comment -->
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← Older revision		Revision as of 14:38, 21 May 2018
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	* https://www.hackster.io/niesse/water-level-ultrasonic-sensor-with-lorawan-c2cf55		* https://www.hackster.io/niesse/water-level-ultrasonic-sensor-with-lorawan-c2cf55
		+	* https://www.arduino.cc/en/Tutorial/HelloWorld

@@ Line 3: / Line 3: @@
-Getting started . . .
+Getting started:
 *  https://playground.arduino.cc/Learning/CommandLine . . . mentions PlatformIO "ecosystem" and specific Linux ready command line tools for working with Arduino
@@ Line 12: / Line 12: @@
-Specific Arduino projects . . .
+The ATMEGA328P processor used in Arduino Uno boards:
 *  https://www.hackster.io/niesse/water-level-ultrasonic-sensor-with-lorawan-c2cf55
-FreeRTOS port to Arduino . . .
+FreeRTOS port to Arduino:
 *  https://github.com/feilipu/Arduino_FreeRTOS_Library

← Older revision		Revision as of 19:14, 23 April 2018
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	* https://www.youtube.com/watch?v=qAM2S27FWAI . . . avr-dude and related tools can program Arduino Uno boards		* https://www.youtube.com/watch?v=qAM2S27FWAI . . . avr-dude and related tools can program Arduino Uno boards
		+
		+	* https://playground.arduino.cc/OpenBSD/CLI . . . Arduino development work on OpenBSD systems

@@ Line 17: / Line 17: @@
 FreeRTOS port to Arduino . . .
-*  ust wanted to offer this in case you wrote back and the message bounced
+*  https://github.com/feilipu/Arduino_FreeRTOS_Library
 <!-- comment -->

← Older revision		Revision as of 19:02, 23 April 2018
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		+	FreeRTOS port to Arduino . . .
		+
		+	* ust wanted to offer this in case you wrote back and the message bounced



	<!-- comment -->		<!-- comment -->

← Older revision		Revision as of 17:07, 23 April 2018
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		+
		+
		+
		+	Getting started . . .
		+
		+	* https://playground.arduino.cc/Learning/CommandLine . . . mentions PlatformIO "ecosystem" and specific Linux ready command line tools for working with Arduino
		+
		+	* https://www.youtube.com/watch?v=qAM2S27FWAI . . . avr-dude and related tools can program Arduino Uno boards
		+
		+
		+	Specific Arduino projects . . .

	* https://www.hackster.io/niesse/water-level-ultrasonic-sensor-with-lorawan-c2cf55		* https://www.hackster.io/niesse/water-level-ultrasonic-sensor-with-lorawan-c2cf55

−	* https://www.youtube.com/watch?v=qAM2S27FWAI . . . avr-~~dude and related tools can program Arduino Uno boards~~	+
		+
		+
		+
		+	<!-- comment -->

← Older revision		Revision as of 15:15, 23 April 2018
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	* https://www.hackster.io/niesse/water-level-ultrasonic-sensor-with-lorawan-c2cf55		* https://www.hackster.io/niesse/water-level-ultrasonic-sensor-with-lorawan-c2cf55
		+
		+	* https://www.youtube.com/watch?v=qAM2S27FWAI . . . avr-dude and related tools can program Arduino Uno boards