Pi Config

Pi config

setting up

iic

//
/*
comment out i2c in black list in /etc/modprobe.d and reboot 
then run:
sudo modprobe i2c-dev
sudo chmod o+rw /dev/ic*
*/

	int fd;
											// File descrition
	//char *fileName = "/dev/i2c-0";
	// I nneded to change the device
	char *fileName = "/dev/i2c-1";

	// address C6 so 63 is 								// Name of the port we will be using
	int  address = 0x63;										// Address of LCD03 shifted right one bit
	//int  address = 0xC6;										// Address of LCD03 shifted right one bit
	char buf[10];

	if ((fd = open(fileName, O_RDWR)) < 0) {					// Open port for reading and writing
		printf("Failed to open i2c port\n");
                printf(" run: \n");
                printf(" sudo modprobe i2c-dev  \n");
                printf(" sudo chmod o+rw /dev/i2c* \n");
		exit(1);
	}

	if (ioctl(fd, I2C_SLAVE, address) < 0) {					// Set the port options and set the address of the device we wish to speak to
		printf("Unable to get bus access to talk to slave\n");
		exit(1);
	}

	buf[0] = 0;													// Commands to clear the screen
	buf[1] = 12;

	if ((write(fd, buf, 2)) != 2) {								// clear the screen
		printf("Error writing to i2c slave\n");
		exit(1);
	}
	printf("Sending text to LCD03\n");

http://www.dougrice.plus.com/dev/rlcd1.c

GPIO

GPIO notes
==========================================

http://hertaville.com/2012/11/18/introduction-to-accessing-the-raspberry-pis-gpio-in-c/

==========================================
http://www.hobbytronics.co.uk/arduino/arduino-lcd-keypad-shield
http://elinux.org/RPi_BCM2835_GPIOs

http://pmb.neongrit.net/blog/?p=64 - LCD2x16 page

http://log.liminastudio.com/writing/tutorials/tutorial-how-to-use-your-raspberry-pi-like-an-arduino

This is a document about driving the GPIO.

http://quick2wire.com/2012/05/safe-controlled-access-to-gpio-on-the-raspberry-pi/

This is a document about driving the GPIO.

http://elinux.org/RPi_Low-level_peripherals#GPIO_Driving_Example_.28Bash_shell_script.2C_using_sysfs.2C_part_of_the_raspbian_operating_system.29

sudo -i

#sleep 1
echo "0" > /sys/class/gpio/gpio22/value
echo "1" > /sys/class/gpio/gpio23/value

sleep 1
echo "1" > /sys/class/gpio/gpio22/value
echo "0" > /sys/class/gpio/gpio23/value

sleep 1
echo "0" > /sys/class/gpio/gpio22/value
echo "0" > /sys/class/gpio/gpio23/value
=========================================================
#!/bin/sh

# GPIO numbers should be from this list
# 0, 1, 4, 7, 8, 9, 10, 11, 14, 15, 17, 18, 21, 22, 23, 24, 25

# Note that the GPIO numbers that you program here refer to the pins
# of the BCM2835 and *not* the numbers on the pin header. 
# So, if you want to activate GPIO7 on the header you should be 
# using GPIO4 in this script. Likewise if you want to activate GPIO0
# on the header you should be using GPIO17 here.

# Set up GPIO 4 and set to output
echo "4" > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio4/direction

# Set up GPIO 7 and set to input
echo "7" > /sys/class/gpio/export
echo "in" > /sys/class/gpio/gpio7/direction

# Write output
echo "1" > /sys/class/gpio/gpio4/value

# Read from input
cat /sys/class/gpio/gpio7/value 

# Clean up
echo "4" > /sys/class/gpio/unexport
echo "7" > /sys/class/gpio/unexport

echo "22" > /sys/class/gpio/unexport
echo "23" > /sys/class/gpio/unexport
echo "24" > /sys/class/gpio/unexport

One wire - DS18S20 reader

Used GPIO4 pin 7 - middle pin. 3v3 to power gnd to gnd

		/ 3v3  
+	

DS18S20 - top (|- buss --GPIO4--[4k7]--/

	  	\ gnd

http://learn.adafruit.com/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing/hardware http://learn.adafruit.com/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing/hardware http://learn.adafruit.com/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing/ds18b20

sudo modprobe w1-gpio sudo modprobe w1-therm cd /sys/bus/w1/devices ls

cat 10-*/w1*

cd 28-xxxx (change this to match what serial number pops up) cat w1_slave

cat: power: Is a directory cat: subsystem: Is a directory DRIVER=w1_slave_driver W1_FID=10 W1_SLAVE_ID=00000000000000080189EF05 22 00 4b 46 ff ff 0c 10 3f : crc=3f YES 22 00 4b 46 ff ff 0c 10 3f t=17000 pi@raspberrypi /sys/bus/w1/devices/10-00080189ef05 $ cd .. pi@raspberrypi /sys/bus/w1/devices $ ls 10-00080189ef05 10-0008018a44f7 w1_bus_master1 pi@raspberrypi /sys/bus/w1/devices $ cd 10-0008018a44f7 pi@raspberrypi /sys/bus/w1/devices/10-0008018a44f7 $ ls driver id name power subsystem uevent w1_slave pi@raspberrypi /sys/bus/w1/devices/10-0008018a44f7 $ cat * cat: driver: Is a directory </pre>