63 lines
2.3 KiB
C
63 lines
2.3 KiB
C
// Copyright (c) 2014 Adafruit Industries
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// Author: Tony DiCola
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// Based on code from Gert van Loo & Dom: http://elinux.org/RPi_Low-level_peripherals#GPIO_Code_examples
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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// Simple fast memory-mapped GPIO library for the Raspberry Pi.
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#ifndef PI_2_MMIO_H
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#define PI_2_MMIO_H
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#include <stdint.h>
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#define MMIO_SUCCESS 0
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#define MMIO_ERROR_DEVMEM -1
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#define MMIO_ERROR_MMAP -2
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#define MMIO_ERROR_OFFSET -3
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extern volatile uint32_t* pi_2_mmio_gpio;
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int pi_2_mmio_init(void);
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static inline void pi_2_mmio_set_input(const int gpio_number) {
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// Set GPIO register to 000 for specified GPIO number.
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*(pi_2_mmio_gpio+((gpio_number)/10)) &= ~(7<<(((gpio_number)%10)*3));
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}
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static inline void pi_2_mmio_set_output(const int gpio_number) {
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// First set to 000 using input function.
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pi_2_mmio_set_input(gpio_number);
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// Next set bit 0 to 1 to set output.
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*(pi_2_mmio_gpio+((gpio_number)/10)) |= (1<<(((gpio_number)%10)*3));
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}
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static inline void pi_2_mmio_set_high(const int gpio_number) {
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*(pi_2_mmio_gpio+7) = 1 << gpio_number;
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}
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static inline void pi_2_mmio_set_low(const int gpio_number) {
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*(pi_2_mmio_gpio+10) = 1 << gpio_number;
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}
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static inline uint32_t pi_2_mmio_input(const int gpio_number) {
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return *(pi_2_mmio_gpio+13) & (1 << gpio_number);
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}
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#endif
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