Ivo van Poorten / fastlib

Library to access LPC17xx peripherals. It uses static inline functions, constant propagation and dead code elimination to be as fast as possible.

Dependents:   Chua-VGA Wolfram-1D-VGA WolframRnd-1D-VGA Basin-VGA ... more

gpio.h@0:7a91348b4a02, 2011-07-03 (annotated)

Committer:
Ivop
Date:
Sun Jul 03 17:11:55 2011 +0000
Revision:
0:7a91348b4a02

        

        
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/* Copyright (C) 2010, 2011 by Ivo van Poorten <ivop@euronet.nl>





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 * This file is licensed under the terms of the GNU Lesser





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 * General Public License, version 3.





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 */





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#ifndef FASTLIB_GPIO_H





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#define FASTLIB_GPIO_H





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#include "fastlib/common.h"





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static inline volatile uint32_t *fl_gpio_get_base(const int port) {





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    switch (port) {





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    case 0:  return (volatile uint32_t *) 0x2009c000;





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    case 1:  return (volatile uint32_t *) 0x2009c020;





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    case 2:  return (volatile uint32_t *) 0x2009c040;





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    case 3:  return (volatile uint32_t *) 0x2009c060;





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    case 4:  return (volatile uint32_t *) 0x2009c080;





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    default: return (volatile uint32_t *) 0;





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    }





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}





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#define FL_GPIO_OVERALL_INT_STATUS      ((volatile uint32_t *) 0x40028080)





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#define FL_GPIO_PORT0_RISE_INT_STATUS   ((volatile uint32_t *) 0x40028084)





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#define FL_GPIO_PORT0_FALL_INT_STATUS   ((volatile uint32_t *) 0x40028088)





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#define FL_GPIO_PORT0_INT_CLEAR         ((volatile uint32_t *) 0x4002808C)





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#define FL_GPIO_PORT0_RISE_INT          ((volatile uint32_t *) 0x40028090)





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#define FL_GPIO_PORT0_FALL_INT          ((volatile uint32_t *) 0x40028094)





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#define FL_GPIO_PORT2_RISE_INT_STATUS   ((volatile uint32_t *) 0x400280A4)





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#define FL_GPIO_PORT2_FALL_INT_STATUS   ((volatile uint32_t *) 0x400280A8)





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#define FL_GPIO_PORT2_INT_CLEAR         ((volatile uint32_t *) 0x400280AC)





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#define FL_GPIO_PORT2_RISE_INT          ((volatile uint32_t *) 0x400280B0)





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#define FL_GPIO_PORT2_FALL_INT          ((volatile uint32_t *) 0x400280B4)





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/* dir: 0=input, 1=output */





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static inline void fl_gpio_set_direction(const unsigned port, const unsigned int bitmask, const unsigned dir) {





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    if (dir) *(fl_gpio_get_base(port)) |=  bitmask;





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    else     *(fl_gpio_get_base(port)) &= ~bitmask;





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}





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static inline void fl_gpio_set_value(const unsigned port, const unsigned bitmask) {





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    *(fl_gpio_get_base(port) + 6) = bitmask;





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}





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static inline void fl_gpio_clear_value(const unsigned port, const unsigned bitmask) {





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    *(fl_gpio_get_base(port) + 7) = bitmask;





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}





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static inline uint32_t fl_gpio_get_value(const unsigned port, const unsigned bitmask) {





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    return *(fl_gpio_get_base(port) + 5);





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}





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static inline void fl_gpio_set_mask(const unsigned port, const unsigned bitmask) {





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    *(fl_gpio_get_base(port) + 4) |= bitmask;





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}





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static inline void fl_gpio_clear_mask(const unsigned port, const unsigned bitmask) {





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    *(fl_gpio_get_base(port) + 4) &= ~bitmask;





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}





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/* interrupts only on port 0 or 2 */





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/* return: 0 = none, !0 = at least one */





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static inline int fl_gpio_port_interrupt_status(const unsigned port) {





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    return *FL_GPIO_OVERALL_INT_STATUS & (1U<<port);





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}





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static inline void fl_gpio_interrupt_enable(const unsigned port, const unsigned bitmask, const unsigned edge) {





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    if (port == 0) {





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        if (edge == FL_RISE) *FL_GPIO_PORT0_RISE_INT |= bitmask;





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        else                 *FL_GPIO_PORT0_FALL_INT |= bitmask;





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    } else {





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        if (edge == FL_RISE) *FL_GPIO_PORT2_RISE_INT |= bitmask;





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        else                 *FL_GPIO_PORT2_FALL_INT |= bitmask;





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    }





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}





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static inline void fl_gpio_interrupt_disable(const unsigned port, const unsigned bitmask, const unsigned edge) {





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    if (port == 0) {





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        if (edge == FL_RISE) *FL_GPIO_PORT0_RISE_INT &= ~bitmask;





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        else                 *FL_GPIO_PORT0_FALL_INT &= ~bitmask;





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    } else {





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        if (edge == FL_RISE) *FL_GPIO_PORT2_RISE_INT &= ~bitmask;





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        else                 *FL_GPIO_PORT2_FALL_INT &= ~bitmask;





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    }





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}





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static inline uint32_t fl_gpio_interrupt_status(const unsigned port, const unsigned bitmask, const unsigned edge) {





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    if (port == 0) {





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        if (edge == FL_RISE) return *FL_GPIO_PORT0_RISE_INT_STATUS & bitmask;





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        else                 return *FL_GPIO_PORT0_FALL_INT_STATUS & bitmask;





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    } else {





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        if (edge == FL_RISE) return *FL_GPIO_PORT2_RISE_INT_STATUS & bitmask;





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        else                 return *FL_GPIO_PORT2_FALL_INT_STATUS & bitmask;





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    }





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}





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static inline void fl_gpio_interrupt_clear(const unsigned port, const unsigned bitmask) {





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    if (port == 0) *FL_GPIO_PORT0_INT_CLEAR = bitmask;





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    else           *FL_GPIO_PORT2_INT_CLEAR = bitmask;





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}





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#endif