Wiringpi Serial Port

Bitmap2lcd Serial Number more. WiringPi comes with a separate program to help manage the GPIO. This program, called gpio, can also be used in scripts to manipulate the GPIO pins – set outputs and read inputs.

It’s even possible to write entire programs just using the gpio command in a shell-script, although it’s not terribly efficient doing it that way Another way to call it is using the system() function in C/C++ or it’s equivalent in other programming languages. • The gpio command is designed to be installed as a setuid program and called by a normal user without using the sudo command (or logging in as root). In addition to using the gpio utility to control the GPIO pins, you can: • Export/Unexport pins via the /sys/class/gpio interface, where they will then be available to user programs (that then do not need to be run as root or with sudo) • Export pins to enable edge-triggered interrupts via the /sys/class/gpio interface. • Control the pins on the PiFace peripheral device. • Load SPI and I2C modules and set /dev/ permissions to enable read/write by the user running the gpio program. • Set the SPI buffer size and I2C baud rate (when loading the modules) • Output values to the Gertboard DAC • Read inputs from the Gertboard ADC • Determine your Raspberry Pi board hardware revision. See the man page for the gpio program to see what all the features are by typing man gpio at the command prompt.

Usage From the Linux command line: • gpio -v This prints the version. • gpio -g The optional -g flag causes pin numbers to be interpreted as BCM_GPIO pin numbers rather than standard wiringPi pin numbers. Standard input and output commands • gpio [-g] mode in/out/pwm/up/down/tri This sets the mode of a pin to be input, output or pwm and additionally can set the internal pull-up/down resistors to pull-up, pull-down or none. • gpio [-g] write 0/1 This sets an output pin to high (1) or low (0) • gpio [-g] pwm Set the pin to a PWM value (0-1023 is supported) • gpio [-g] read Reads and prints the logic value of the given pin.

It will print 0 (low) or 1 (high). • gpio readall This reads all the normally accessible pins and prints a table of their numbers (both wiringPi and BCM_GPIO, so makes for a handy cross-reference chart), along with their modes and current values. Module Load Commands • gpio load spi [buffer size in KB] This loads the SPI kernel modules and optionally sets the internal buffer to the given size in KB (multiples of 1024). Mengatasi Instal Driver Flashtool Di Windows 7. The default is 4KB and is usually more than enough for most application which only exchange a byte or 2 at a time over the SPI bus. The /dev/spi* entries are set to be owned by the person using the gpio program, so there is no need to run subsequent programs as root (unless they use other wiringPi functions) • gpio load i2c [baud rate in Kb/sec] This loads the I2C kernel modules and optionally sets the baud rate to the given speed in Kb/sec (multiples of 1000).