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109 lines
4.1 KiB
109 lines
4.1 KiB
/*
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* gpio.h
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*
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* Copyright (c) 2014 Jeremy Garff <jer @ jers.net>
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted
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* provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* 3. Neither the name of the owner nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef __GPIO_H__
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#define __GPIO_H__
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typedef struct
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{
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uint32_t fsel[6]; // GPIO Function Select
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uint32_t resvd_0x18;
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uint32_t set[2]; // GPIO Pin Output Set
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uint32_t resvd_0x24;
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uint32_t clr[2]; // GPIO Pin Output Clear
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uint32_t resvd_0x30;
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uint32_t lev[2]; // GPIO Pin Level
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uint32_t resvd_0x3c;
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uint32_t eds[2]; // GPIO Pin Event Detect Status
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uint32_t resvd_0x48;
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uint32_t ren[2]; // GPIO Pin Rising Edge Detect Enable
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uint32_t resvd_0x54;
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uint32_t fen[2]; // GPIO Pin Falling Edge Detect Enable
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uint32_t resvd_0x60;
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uint32_t hen[2]; // GPIO Pin High Detect Enable
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uint32_t resvd_0x6c;
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uint32_t len[2]; // GPIO Pin Low Detect Enable
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uint32_t resvd_0x78;
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uint32_t aren[2]; // GPIO Pin Async Rising Edge Detect
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uint32_t resvd_0x84;
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uint32_t afen[2]; // GPIO Pin Async Falling Edge Detect
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uint32_t resvd_0x90;
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uint32_t pud; // GPIO Pin Pull up/down Enable
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uint32_t pudclk[2]; // GPIO Pin Pull up/down Enable Clock
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uint32_t resvd_0xa0[4];
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uint32_t test;
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} __attribute__((packed, aligned(4))) gpio_t;
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#define GPIO_OFFSET (0x00200000)
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static inline void gpio_function_set(volatile gpio_t *gpio, uint8_t pin, uint8_t function)
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{
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int regnum = pin / 10;
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int offset = (pin % 10) * 3;
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uint8_t funcmap[] = { 4, 5, 6, 7, 3, 2 }; // See datasheet for mapping
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if (function > 5)
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{
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return;
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}
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gpio->fsel[regnum] &= ~(0x7 << offset);
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gpio->fsel[regnum] |= ((funcmap[function]) << offset);
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}
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static inline void gpio_level_set(volatile gpio_t *gpio, uint8_t pin, uint8_t level)
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{
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int regnum = pin >> 5;
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int offset = (pin & 0x1f);
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if (level)
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{
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gpio->set[regnum] = (1 << offset);
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}
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else
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{
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gpio->clr[regnum] = (1 << offset);
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}
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}
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static inline void gpio_output_set(volatile gpio_t *gpio, uint8_t pin, uint8_t output)
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{
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int regnum = pin / 10;
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int offset = (pin % 10) * 3;
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uint8_t function = output ? 1 : 0; // See datasheet for mapping
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gpio->fsel[regnum] &= ~(0x7 << offset);
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gpio->fsel[regnum] |= ((function & 0x7) << offset);
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}
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#endif /* __GPIO_H__ */
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