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81 lines
1.5 KiB
C
81 lines
1.5 KiB
C
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/*
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* gpio-xburst.h - Really primitive XBurst GPIO access
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*
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* Written 2010 by Werner Almesberger
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* Copyright 2010 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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/*
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* Ports are numbered 0 = A, 1 = B, ...
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*/
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#ifndef GPIO_XBURST_H
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#define GPIO_XBURST_H
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#include <stdint.h>
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volatile void *mem;
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#define REG(off) (*(volatile uint32_t *) (mem+(off)))
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#define port_pin(port) REG(port*0x100)
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#define port_dats(port) REG(port*0x100+0x14)
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#define port_datc(port) REG(port*0x100+0x18)
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#define port_func(port) REG(port*0x100+0x48)
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#define port_dirs(port) REG(port*0x100+0x64)
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#define port_dirc(port) REG(port*0x100+0x68)
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static inline void gpio_high(unsigned port, unsigned bit)
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{
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port_dats(port) = 1 << bit;
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}
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static inline void gpio_low(unsigned port, unsigned bit)
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{
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port_datc(port) = 1 << bit;
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}
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static inline void gpio_set(unsigned port, unsigned bit, int value)
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{
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if (value)
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gpio_high(port, bit);
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else
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gpio_low(port, bit);
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}
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static inline int gpio_get(unsigned port, unsigned bit)
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{
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return (port_pin(port) >> bit) & 1;
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}
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static inline void gpio_output(unsigned port, unsigned bit)
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{
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port_dirs(port) = 1 << bit;
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}
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static inline void gpio_input(unsigned port, unsigned bit)
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{
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port_dirc(port) = 1 << bit;
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}
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void gpio_init(void);
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#endif /* !GPIO_XBURST_H */
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