pihwm  r1
A lightweight C library for Raspberry Pi hardware modules.
pi_gpio.h
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1 
28 #ifndef PI_GPIO_H
29 #define PI_GPIO_H
30 
31 // Useful constants
32 #define INPUT 1
33 #define OUTPUT 0
34 #define IN INPUT
35 #define OUT OUTPUT
36 
37 #define HIGH 1
38 #define LOW 0
39 #define ON HIGH
40 #define OFF LOW
41 
42 // Function prototypes
43 int gpio_init (unsigned int pin, unsigned int dir);
44 int gpio_set_int (unsigned int pin, void (*isr) (int), char *mode);
45 int gpio_clear_int (unsigned int pin);
46 int gpio_write (unsigned int pin, unsigned int val);
47 int gpio_read (unsigned int pin);
48 int gpio_release (unsigned int pin);
49 
50 // Aliases for pseudo-Arduino compatibility
51 #define pinMode(pin, dir) gpio_init(pin, dir);
52 #define digitalWrite(pin, val) gpio_write(pin, val);
53 #define digitalRead(pin) gpio_read(pin);
54 #define attachInterrupt(pin, isr, mode) gpio_set_int(pin, isr, mode);
55 #define detachInterrupt(pin) gpio_clear_int(pin);
56 
57 #endif
58 
gpio_init
int gpio_init(unsigned int pin, unsigned int dir)
Initialize the GPIO interface for the pin numbered pin on the Raspberry Pi P1 header in the direction...
Definition: pi_gpio.c:124
gpio_release
int gpio_release(unsigned int pin)
The inverse of gpio_init. Frees the pin numbered pin on the Raspberry Pi P1 header,...
Definition: pi_gpio.c:397
gpio_write
int gpio_write(unsigned int pin, unsigned int val)
Set the pin numbered pin on the Raspberry Pi P1 header to the value specified by val....
Definition: pi_gpio.c:321
gpio_read
int gpio_read(unsigned int pin)
Read the value on the pin numbered pin on the Raspberry Pi P1 header.
Definition: pi_gpio.c:365
gpio_set_int
int gpio_set_int(unsigned int pin, void(*isr)(int), char *mode)
Set isr as the interrupt service routine (ISR) for pin numbered pin on the Raspberry Pi P1 header....
Definition: pi_gpio.c:274
gpio_clear_int
int gpio_clear_int(unsigned int pin)
Clears any interrupt service routine (ISR) set on the pin numbered pin on the Raspberry Pi P1 header....
Definition: pi_gpio.c:303