/*********************************************************************************
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* Copyright: (C) 2019 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: at91_sysGpio.h
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* Description: This file si GPIO API operatore on /sys/class/gpio/xxx
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*
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* Version: 1.0.0(2019年08月26日)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "2019年08月26日 22时28分19秒"
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*
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********************************************************************************/
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#ifndef _AT91_SYSGPIO_H_
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#define _AT91_SYSGPIO_H_
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#include "at91_sysGpioDef.h"
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#define SYSFILE_LEN 64
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#define SYSGPIO_PATH "/sys/class/gpio/"
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#define SYSGPIO_EXPORT_PATH SYSGPIO_PATH"export"
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#define SYSGPIO_UNEXPORT_PATH SYSGPIO_PATH"unexport"
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//#define GPIO_DEBUG_PRINT
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#ifdef GPIO_DEBUG_PRINT
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#define gpio_print(format,args...) printf(format, ##args)
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#else
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#define gpio_print(format,args...) do{} while(0);
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#endif
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/* export $port in /sys/class/gpio/export */
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extern int gpio_export(const char *port);
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/* unexport $port in /sys/class/gpio/unexport */
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extern int gpio_unexport(const char *port);
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#define M_IN "in" /* set GPIO as input mode */
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#define M_OUT "out" /* set GPIO as output mode */
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#define M_HIGH "high" /* set GPIO as output mode and value be high<1> */
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#define M_LOW "low" /* set GPIO as output mode and value be low<0> */
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/* configure $port direction as $mode */
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extern int gpio_config(const char *port, const char *mode);
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#define V_HIGH "1"
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#define V_LOW "0"
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/* write $value into GPIO $port */
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extern int gpio_write(const char *port, const char *value);
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/* read gpio value from $port */
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extern int gpio_read(const char *port);
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#endif /* ----- #ifndef _AT91_SYSGPIO_H_ ----- */
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