RPi Low-level peripherals - Revision history

Notro at 14:25, 15 May 2013

2013-05-15T14:25:00Z

Jwdietrich: /* Lazarus / Free Pascal */

2013-04-28T20:48:02Z

‎Lazarus / Free Pascal

Alexeames: /* P5 header */

2013-04-28T12:54:02Z

‎P5 header

Alexeames: Added P5 slant photo and text

2013-04-28T12:53:09Z

Added P5 slant photo and text

Alexeames: /* P5 header */

2013-04-28T12:51:03Z

‎P5 header

Alexeames: /* P5 header */

2013-04-28T12:16:16Z

‎P5 header

IanH: Make link to serial port page clearer

2013-04-01T12:01:24Z

Make link to serial port page clearer

Croston: /* Python */

2013-03-26T01:18:15Z

‎Python

Jwdietrich: /* Lazarus / Free Pascal */

2013-03-16T18:37:17Z

‎Lazarus / Free Pascal

BerryBerry: /* Python */

2013-03-14T22:18:04Z

‎Python

← Older revision		Revision as of 14:25, 15 May 2013
Line 1,122:		Line 1,122:

	[[Media:Raspberry_Pi_I-O_viii.doc \| Raspberry_Pi_I-O_viii.doc]]		[[Media:Raspberry_Pi_I-O_viii.doc \| Raspberry_Pi_I-O_viii.doc]]
		+
		+	==SPI==
		+
		+	There is one SPI bus brought out to the header: [[RPi_SPI]]

	==MIPI CSI-2==		==MIPI CSI-2==

← Older revision		Revision as of 20:48, 28 April 2013
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	Alternative ways to access the GPIO port with Lazarus / Free Pascal is by using [http://www.lazarus.freepascal.org/index.php/topic,17404.0.html Lazarus wrapper unit for Gordon Henderson's wiringPi C library] or [http://wiki.lazarus.freepascal.org/Lazarus_on_Raspberry_Pi#2._Hardware_access_via_encapsulated_shell_calls encapsulated shell calls].		Alternative ways to access the GPIO port with Lazarus / Free Pascal is by using [http://www.lazarus.freepascal.org/index.php/topic,17404.0.html Lazarus wrapper unit for Gordon Henderson's wiringPi C library] or [http://wiki.lazarus.freepascal.org/Lazarus_on_Raspberry_Pi#2._Hardware_access_via_encapsulated_shell_calls encapsulated shell calls].
		+
		+	The [http://wiki.freepascal.org/Lazarus_on_Raspberry_Pi Lazarus wiki] describes a [http://wiki.freepascal.org/Lazarus_on_Raspberry_Pi#Reading_the_status_of_a_port demo program] that can read the status of a GPIO pin.

	=== BASIC ===		=== BASIC ===

← Older revision		Revision as of 12:54, 28 April 2013
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	[[File:Male-slanted2small.jpg\|150px\|thumb\|left\|Slanted P5 header]]		[[File:Male-slanted2small.jpg\|150px\|thumb\|left\|Slanted P5 header]]
		+
	Note that the connector is intended to be mounted on the '''bottom''' of the PCB, so that for those who put the connector on the top side, the pin numbers are swapped. Pin 1 and pin 2 are swapped, pin 3 and 4, etc.		Note that the connector is intended to be mounted on the '''bottom''' of the PCB, so that for those who put the connector on the top side, the pin numbers are swapped. Pin 1 and pin 2 are swapped, pin 3 and 4, etc.

@@ Line 226: / Line 226: @@
 |}
 Note that the connector is intended to be mounted on the '''bottom''' of the PCB, so that for those who put the connector on the top side, the pin numbers are swapped. Pin 1 and pin 2 are swapped, pin 3 and 4, etc.
-[[File:Male-slanted2small.jpg|150px|thumb|left|Slanted P5 header]]Some people have come to the conclusion that the best way (for them) to attach this header is on top, [http://raspi.tv/2013/the-leaning-header-of-pi5a-how-best-to-solder-a-header-on-p5 at a slant away from the P1 header.]
+Some people have come to the conclusion that the best way (for them) to attach this header is on top, [http://raspi.tv/2013/the-leaning-header-of-pi5a-how-best-to-solder-a-header-on-p5 at a slant away from the P1 header.]
 The new header can provide a second I2C channel (SDA + SCL) and handshake lines for the existing UART (TxD and RxD), or it can be used for an I2S (audio codec chip) interface using the PCM signals CLK, FS (Frame Sync), Din and Dout.

@@ Line 227: / Line 227: @@
 Note that the connector is intended to be mounted on the '''bottom''' of the PCB, so that for those who put the connector on the top side, the pin numbers are swapped. Pin 1 and pin 2 are swapped, pin 3 and 4, etc.
 Some people have come to the conclusion that the best way (for them) to attach this header is on top, [http://raspi.tv/2013/the-leaning-header-of-pi5a-how-best-to-solder-a-header-on-p5 at a slant away from the P1 header.]
 The new header can provide a second I2C channel (SDA + SCL) and handshake lines for the existing UART (TxD and RxD), or it can be used for an I2S (audio codec chip) interface using the PCM signals CLK, FS (Frame Sync), Din and Dout.

← Older revision		Revision as of 12:16, 28 April 2013
Line 227:		Line 227:

	Note that the connector is intended to be mounted on the '''bottom''' of the PCB, so that for those who put the connector on the top side, the pin numbers are swapped. Pin 1 and pin 2 are swapped, pin 3 and 4, etc.		Note that the connector is intended to be mounted on the '''bottom''' of the PCB, so that for those who put the connector on the top side, the pin numbers are swapped. Pin 1 and pin 2 are swapped, pin 3 and 4, etc.
		+	Some people have come to the conclusion that the best way (for them) to attach this header is on top, [http://raspi.tv/2013/the-leaning-header-of-pi5a-how-best-to-solder-a-header-on-p5 at a slant away from the P1 header.]

	The new header can provide a second I2C channel (SDA + SCL) and handshake lines for the existing UART (TxD and RxD), or it can be used for an I2S (audio codec chip) interface using the PCM signals CLK, FS (Frame Sync), Din and Dout.		The new header can provide a second I2C channel (SDA + SCL) and handshake lines for the existing UART (TxD and RxD), or it can be used for an I2S (audio codec chip) interface using the PCM signals CLK, FS (Frame Sync), Din and Dout.

@@ Line 32: / Line 32: @@
 There is also some information on the [[RPi Tutorial Easy GPIO Hardware & Software|Tutorial on Easy GPIO Hardware & Software]].
-Kernel boot messages go to the [[RPi_Serial_Connection|UART]] at 115200&nbsp;bit/s.
+Kernel boot messages go to the UART at 115200&nbsp;bit/s - there are more details on the [[RPi_Serial_Connection|serial port]] page.
 '''R-Pi PCB Revision 2 UPDATE:''' According to Eben at [http://www.raspberrypi.org/archives/1929#comment-31646] the R-Pi Rev.2 board being rolled out starting in September 2012 adds 4 more GPIO on a new connector called P5, and changes some of the existing P1 GPIO pinouts. On Rev2, GPIO_GEN2 [BCM2835/GPIO27] is routed to P1 pin 13, and changes what was SCL0/SDA0 to SCL1/SDA1: SCL1 [BCM2835/GPIO3] is routed to P1 pin 5, SDA1 [BCM2835/GPIO2] is routed to P1 pin 3. Also the power and ground connections previously marked "Do Not Connect" on P1 will remain as connected, specifically: P1-04:+5V0, P1-09:GND, P1-14:GND, P1-17:+3V3, P1-20:GND, P1-25:GND. According to this comment [http://www.raspberrypi.org/archives/2081#comment-33577] (and confirmed in this post [http://www.raspberrypi.org/archives/2233]) the P1 pinout is not expected to change in future beyond the current Rev.2 layout.

@@ Line 603: / Line 603: @@
 === Python ===
-The GPIO Python module is available at http://pypi.python.org/pypi/RPi.GPIO
+The RPi.GPIO module is installed by default in Raspbian.
 Any Python script that controls GPIO must be run as root.
 <pre>import RPi.GPIO as GPIO
 # Set up the GPIO channels - one input and one output
@@ Line 615: / Line 618: @@
 # Output to pin 12
-GPIO.output(12, True)
+GPIO.output(12, GPIO.HIGH)
 # The same script as above but using BCM GPIO 00..nn numbers
@@ Line 622: / Line 625: @@
 GPIO.setup(18, GPIO.OUT)
 input_value = GPIO.input(17)
-GPIO.output(18, True)</pre>
+GPIO.output(18, GPIO.HIGH)</pre>
 Also available is RPIO at https://pypi.python.org/pypi/RPIO
-RPIO extends RPi.GPIO with PWM, GPIO interrups, TCP socket interrupts, command line tools and more.
+RPIO extends RPi.GPIO with TCP socket interrupts, command line tools and more.
-Uniquely (as of 14 March 2013) RPIO offers a debounce_timeout_ms option for use with swiches and push buttons connected to GPIO pins..
 === Java ===

@@ Line 947: / Line 947: @@
 </pre>
-An alternative way to access the GPIO port with Lazarus / Free Pascal is by using [http://www.lazarus.freepascal.org/index.php/topic,17404.0.html Lazarus wrapper unit for Gordon Henderson's wiringPi C library].
+Alternative ways to access the GPIO port with Lazarus / Free Pascal is by using [http://www.lazarus.freepascal.org/index.php/topic,17404.0.html Lazarus wrapper unit for Gordon Henderson's wiringPi C library] or [http://wiki.lazarus.freepascal.org/Lazarus_on_Raspberry_Pi#2._Hardware_access_via_encapsulated_shell_calls encapsulated shell calls].
 === BASIC ===