GPIO通过计数进行控制

app/src/main/cpp/GPIOControl.cpp

@@ -31,20 +31,73 @@ typedef struct
     char str[MAX_STRING_LEN];
 }IOT_PARAM;
 
+
+std::mutex GpioControl::m_locker;
+std::vector<std::pair<int, uint32_t>> GpioControl::m_references;
+
 void GpioControl::setInt(int cmd, int value)
 {
-    int fd = open(GPIO_NODE_MP, O_RDONLY);
+    int fd = -1;
     IOT_PARAM param;
     param.cmd = cmd;
     param.value = value;
+    int res = 0;
     // LOGE("set_int fd=%d,cmd=%d,value=%d\r\n",fd, cmd, value);
-    if( fd > 0 )
+
+    uint32_t references = (value != 0) ? 1 : 0;
+    std::vector<std::pair<int, uint32_t> >::iterator it;
+
+    if (value)
     {
-        int res = ioctl(fd, IOT_PARAM_WRITE, &param);
-        // LOGE("set_int22 cmd=%d,value=%d,result=%d\r\n",param.cmd, param.value, param.result);
-        close(fd);
+        m_locker.lock();
+        fd = open(GPIO_NODE_MP, O_RDONLY);
+        if( fd > 0 )
+        {
+            res = ioctl(fd, IOT_PARAM_WRITE, &param);
+            close(fd);
+            // check res???
+            for (it = m_references.begin(); it != m_references.end(); ++it)
+            {
+                if (it->first == cmd)
+                {
+                    it->second++;
+                    references = it->second;
+                    break;
+                }
+            }
+            if (it == m_references.end())
+            {
+                m_references.push_back(std::pair<int, uint32_t >(cmd, references));
+            }
+        }
+        m_locker.unlock();
+    }
+    else
+    {
+        m_locker.lock();
+        for (it = m_references.begin(); it != m_references.end(); ++it)
+        {
+            if (it->first == cmd)
+            {
+                if (it->second > 0)
+                {
+                    it->second--;
+                }
+                references = it->second;
+                break;
+            }
+        }
+
+        if (references == 0)
+        {
+            fd = open(GPIO_NODE_MP, O_RDONLY);
+            if (fd > 0) {
+                res = ioctl(fd, IOT_PARAM_WRITE, &param);
+                close(fd);
+            }
+        }
+        m_locker.unlock();
     }
-    return;
 }
 
 int GpioControl::getInt(int cmd)

app/src/main/cpp/GPIOControl.h

@@ -8,6 +8,9 @@
 #include <string>
 #include <chrono>
 #include <thread>
+#include <mutex>
+#include <vector>
+#include <utils>
 
 #define CMD_GET_LIGHT_ADC                       101
 #define CMD_SET_LIGHT_ADC                       102
@@ -176,6 +179,10 @@
 
 class GpioControl
 {
+private:
+    static std::mutex m_locker;
+    static std::vector<std::pair<int, uint32_t>> m_references;
+
 public:
 
     static void setInt(int cmd, int value);