62 lines
2.2 KiB
C
Executable File
62 lines
2.2 KiB
C
Executable File
// Copyright (c) 2014 Adafruit Industries
|
|
// Author: Tony DiCola
|
|
// Based on code from Gert van Loo & Dom: http://elinux.org/RPi_Low-level_peripherals#GPIO_Code_examples
|
|
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
|
|
// The above copyright notice and this permission notice shall be included in all
|
|
// copies or substantial portions of the Software.
|
|
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
// SOFTWARE.
|
|
|
|
// Simple fast memory-mapped GPIO library for the Raspberry Pi.
|
|
#ifndef PI_MMIO_H
|
|
#define PI_MMIO_H
|
|
|
|
#include <stdint.h>
|
|
|
|
#define MMIO_SUCCESS 0
|
|
#define MMIO_ERROR_DEVMEM -1
|
|
#define MMIO_ERROR_MMAP -2
|
|
|
|
extern volatile uint32_t* pi_mmio_gpio;
|
|
|
|
int pi_mmio_init(void);
|
|
|
|
static inline void pi_mmio_set_input(const int gpio_number) {
|
|
// Set GPIO register to 000 for specified GPIO number.
|
|
*(pi_mmio_gpio+((gpio_number)/10)) &= ~(7<<(((gpio_number)%10)*3));
|
|
}
|
|
|
|
static inline void pi_mmio_set_output(const int gpio_number) {
|
|
// First set to 000 using input function.
|
|
pi_mmio_set_input(gpio_number);
|
|
// Next set bit 0 to 1 to set output.
|
|
*(pi_mmio_gpio+((gpio_number)/10)) |= (1<<(((gpio_number)%10)*3));
|
|
}
|
|
|
|
static inline void pi_mmio_set_high(const int gpio_number) {
|
|
*(pi_mmio_gpio+7) = 1 << gpio_number;
|
|
}
|
|
|
|
static inline void pi_mmio_set_low(const int gpio_number) {
|
|
*(pi_mmio_gpio+10) = 1 << gpio_number;
|
|
}
|
|
|
|
static inline uint32_t pi_mmio_input(const int gpio_number) {
|
|
return *(pi_mmio_gpio+13) & (1 << gpio_number);
|
|
}
|
|
|
|
#endif
|