From: Bas Schouten <bas@basschouten.com>
Date: Tue, 29 Aug 2023 12:56:35 +0000 (+0200)
Subject: Completely remove dependencies on external libraries for GPIO interaction.
X-Git-Url: https://git.basschouten.com/?a=commitdiff_plain;h=HEAD;p=mqttthermostat.git

Completely remove dependencies on external libraries for GPIO interaction.
---

diff --git a/MQTTThermostat/CMakeLists.txt b/MQTTThermostat/CMakeLists.txt
index 19c0885..3529552 100644
--- a/MQTTThermostat/CMakeLists.txt
+++ b/MQTTThermostat/CMakeLists.txt
@@ -22,7 +22,6 @@ endif (HAS_AHT_SUPPORT)
 
 if (HAS_GPIO_SUPPORT)
 target_sources (mqttthermostat PRIVATE "GPIOHeatingController.cpp")
-target_link_libraries (mqttthermostat PRIVATE pigpio)
 add_compile_definitions(HAS_GPIO_SUPPORT)
 endif (HAS_GPIO_SUPPORT)
 
diff --git a/MQTTThermostat/GPIOHeatingController.cpp b/MQTTThermostat/GPIOHeatingController.cpp
index ece65f1..e4306bb 100644
--- a/MQTTThermostat/GPIOHeatingController.cpp
+++ b/MQTTThermostat/GPIOHeatingController.cpp
@@ -1,25 +1,54 @@
 #include <stdio.h>
 #include <stdint.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
 
 #include "GPIOHeatingController.h"
-#include <pigpio.h>
 
 using namespace std;
 
 GPIOHeatingController::GPIOHeatingController(uint32_t aPin)
   : mPin(aPin)
 {
-  gpioInitialise();
-  gpioSetMode(mPin, PI_OUTPUT);
+  char buffer[256];
+  ssize_t bytes_written;
+  int fd;
+
+  fd = open("/sys/class/gpio/export", O_WRONLY);
+  if (-1 == fd) {
+    fprintf(stderr, "Failed to open export for writing!\n");
+    return;
+  }
+
+  bytes_written = snprintf(buffer, 256, "%d", mPin);
+  write(fd, buffer, bytes_written);
+  close(fd);
+
+  snprintf(buffer, 256, "/sys/class/gpio/gpio%d/direction", mPin);
+  fd = open(buffer, O_WRONLY);
+  if (-1 == fd) {
+    fprintf(stderr, "Failed to set gpio direction.\n");
+  }
+
+  write(fd, "out", 3);
+  close(fd);
 }
 
 void
 GPIOHeatingController::setHeatingActive(bool aActive)
 {
-  if (aActive) {
-    gpioWrite(mPin, 1);
-  }
-  else {
-    gpioWrite(mPin, 0);
+  char buffer[256];
+  int fd;
+
+  snprintf(buffer, 256, "/sys/class/gpio/gpio%d/value", mPin);
+  fd = open(buffer, O_WRONLY);
+  if (-1 == fd) {
+    fprintf(stderr, "Failed to output gpio.\n");
+    return;
   }
+
+  write(fd, aActive ? "1" : "0", 1);
+  close(fd);
 }