mirror of https://github.com/arendst/Tasmota.git
146 lines
3.4 KiB
C++
146 lines
3.4 KiB
C++
/*
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* https://github.com/mrshu/GPIOlib
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* Copyright (c) 2011, Copyright (c) 2011 mr.Shu
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* All rights reserved.
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*
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* Modified on 24 June 2012, 11:06 AM
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* File: gpio.cpp
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* Author: purinda (purinda@gmail.com)
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*
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* Patched for filedescriptor catching and error control by L Diaz 2018
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*/
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#include "gpio.h"
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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std::map<int,GPIOfdCache_t> GPIO::cache;
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GPIO::GPIO() {
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}
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GPIO::~GPIO() {
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}
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void GPIO::open(int port, int DDR)
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{
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FILE *f;
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f = fopen("/sys/class/gpio/export", "w");
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if(f==NULL) throw GPIOException("can't export GPIO pin .check access rights");
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fprintf(f, "%d\n", port);
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fclose(f);
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int counter = 0;
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char file[128];
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sprintf(file, "/sys/class/gpio/gpio%d/direction", port);
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while( ( f = fopen(file,"w")) == NULL ){ //Wait 10 seconds for the file to be accessible if not open on first attempt
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sleep(1);
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counter++;
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if(counter > 10){
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throw GPIOException("can't access /sys/class/gpio/gpio%d/direction GPIO pin. check access rights");
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/*perror("Could not open /sys/class/gpio/gpio%d/direction");
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exit(0); */
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}
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}
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int l=(DDR==0) ? fprintf(f, "in\n") : fprintf(f, "out\n");
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if(!(l==3 || l==4)) {
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fclose(f);
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throw GPIOException("can't set direction on GPIO pin. check access rights");
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}
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/*
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if (DDR == 0)
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fprintf(f, "in\n");
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else printf(f, "out\n");
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*/
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fclose(f);
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// Caches the GPIO descriptor;
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sprintf(file, "/sys/class/gpio/gpio%d/value", port);
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int flags= (DDR==0) ? O_RDONLY : O_WRONLY;
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int fd=::open(file,flags);
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if(fd<0) {
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throw GPIOException("Can't open the GPIO");
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} else {
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cache[port]=fd; // cache the fd;
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lseek(fd,SEEK_SET,0);
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}
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}
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void GPIO::close(int port)
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{
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std::map<int,GPIOfdCache_t>::iterator i;
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i=cache.find(port);
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if(i!=cache.end()){
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close(i->second); // close the cached fd
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cache.erase(i); // Delete cache entry
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}
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// Do unexport
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FILE *f;
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f = fopen("/sys/class/gpio/unexport", "w");
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if(f!=NULL) {
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fprintf(f, "%d\n", port);
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fclose(f);
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}
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}
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int GPIO::read(int port)
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{
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std::map<int,GPIOfdCache_t>::iterator i;
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int fd;
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i=cache.find(port);
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if(i==cache.end()){ // Fallback to open the gpio
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GPIO::open(port,GPIO::DIRECTION_IN);
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i=cache.find(port);
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if(i==cache.end()) throw GPIOException("can't access to GPIO");
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else fd=i->second;
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} else fd=i->second;
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char c;
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if(lseek(fd,0,SEEK_SET)==0 && ::read(fd,&c,1)==1){
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return (c=='0') ? 0 : 1;
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} else throw GPIOException("can't access to GPIO");
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/*FILE *f;
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char file[128];
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sprintf(file, "/sys/class/gpio/gpio%d/value", port);
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f = fopen(file, "r");
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int i;
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fscanf(f, "%d", &i);
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fclose(f);
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return i;
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*/
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}
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void GPIO::write(int port, int value){
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std::map<int,GPIOfdCache_t>::iterator i;
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int fd;
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i=cache.find(port);
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if(i==cache.end()){ // Fallback to open the gpio
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GPIO::open(port,GPIO::DIRECTION_OUT);
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i=cache.find(port);
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if(i==cache.end()) throw GPIOException("can't access to GPIO");
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else fd=i->second;
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} else fd=i->second;
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if(lseek(fd,0,SEEK_SET)!=0) throw GPIOException("can't access to GPIO");
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int l=(value==0) ? ::write(fd,"0\n",2) : ::write(fd,"1\n",2);
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if(l!=2) throw GPIOException("can't access to GPIO");
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/*FILE *f;
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char file[128];
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sprintf(file, "/sys/class/gpio/gpio%d/value", port);
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f = fopen(file, "w");
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if (value == 0) fprintf(f, "0\n");
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else fprintf(f, "1\n");
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fclose(f);*/
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}
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