Added support for binocular camera

libraries/Sipeed_GC0328/examples/sipeed_gc0328_binocular.ino

@@ -0,0 +1,35 @@
+#include <Sipeed_GC0328.h>
+#include <Sipeed_ST7789.h>
+
+SPIClass spi_(SPI0); // MUST be SPI0 for Maix series on board LCD
+Sipeed_ST7789 lcd(320, 240, spi_);
+Sipeed_GC0328 camera(FRAMESIZE_QVGA, PIXFORMAT_RGB565, &Wire);
+
+// Use left camera if true, right camera when true
+bool leftCamera = true;
+
+void setup()
+{
+  Serial.begin(115200);
+  lcd.begin(15000000, COLOR_RED);
+  
+  // Start camera in binocular mode
+  if(!camera.begin(true))
+    Serial.printf("camera init fail\n");
+  else
+    Serial.printf("camera init success\n");
+  camera.run(true);
+}
+
+void loop()
+{
+  // Switch left/right cameras
+  camera.shutdown(leftCamera);
+  leftCamera = !leftCamera;
+  
+  uint8_t*img = camera.snapshot();
+  if(img == nullptr || img==0)
+    Serial.printf("snap fail\r\n");
+  else
+    lcd.drawImage(0, 0, camera.width(), camera.height(), (uint16_t*)img);
+}

libraries/Sipeed_GC0328/src/Sipeed_GC0328.cpp

@@ -587,6 +587,11 @@ Sipeed_GC0328::~Sipeed_GC0328()
 }
 
 bool Sipeed_GC0328::begin()
+{
+    return begin(false);
+}
+
+bool Sipeed_GC0328::begin(bool binocular)
 {    
     if(_dataBuffer)
         free(_dataBuffer);
@@ -607,12 +612,31 @@ bool Sipeed_GC0328::begin()
         free(_dataBuffer);
         return false;
     }
-    if(!reset())
+    if(!reset(binocular))
         return false;
-    if(!setPixFormat(_pixFormat))
-        return false;
-    if(!setFrameSize(_frameSize))
-        return false; 
+    
+    if(binocular) {
+        // Configure sensor 0
+        shutdown(true);
+        if(!setPixFormat(_pixFormat))
+            return false;
+        if(!setFrameSize(_frameSize))
+            return false; 
+
+        // Configure sensor 1
+        shutdown(false);
+        if(!setPixFormat(_pixFormat))
+            return false;
+        if(!setFrameSize(_frameSize))
+            return false; 
+    }
+    else {
+        if(!setPixFormat(_pixFormat))
+            return false;
+        if(!setFrameSize(_frameSize))
+            return false; 
+    }
+
     return true;
 }
 
@@ -626,14 +650,39 @@ void Sipeed_GC0328::end()
     _aiBuffer   = nullptr;
 }
 
-bool Sipeed_GC0328::reset()
+bool Sipeed_GC0328::reset(bool binocular)
 {
     if(dvpInit() != 0) // dvp hardware init
         return false;
     if(sensro_gc_detect() != 0) // gc0328 camera detect
         return false;
-    if(gc0328_reset() != 0)
-        return false;
+
+    if(binocular)
+    {
+        // Reset sensor 0
+        shutdown(true);
+        DCMI_RESET_LOW();
+        delay(10);
+        DCMI_RESET_HIGH();
+        delay(10);
+        if(gc0328_reset() != 0)
+            return false;
+
+        // Reset sensor 1
+        shutdown(false);
+        delay(10);
+        DCMI_RESET_LOW();
+        delay(10);
+        DCMI_RESET_HIGH();
+        delay(10);
+        if(gc0328_reset() != 0)
+            return false;
+    }
+    else {
+        if(gc0328_reset() != 0)
+            return false;
+    }
+
     if(dvpInitIrq() != 0)
         return false;
     return true;
@@ -705,6 +754,20 @@ void Sipeed_GC0328::setInvert(bool invert)
     return;
 }
 
+void Sipeed_GC0328::shutdown(bool enable)
+{
+    if (enable)
+    {
+        DCMI_PWDN_HIGH();
+    }
+    else
+    {
+        DCMI_PWDN_LOW();
+    }
+
+    delay(10);
+}
+
 int Sipeed_GC0328::dvpInit(uint32_t freq)
 {
     // just support RGB565 and YUV442 on k210

libraries/Sipeed_GC0328/src/Sipeed_GC0328.h

@@ -34,8 +34,9 @@ public:
     ~Sipeed_GC0328();
     
     virtual bool begin();
+    bool begin(bool binocular);
     virtual void end();
-    bool reset();
+    bool reset(bool binocular = false);
     bool setPixFormat(pixformat_t pixFormat);
     bool setFrameSize(framesize_t frameSize);
     virtual bool run(bool run);
@@ -49,6 +50,7 @@ public:
     virtual uint8_t* getRGB888(){ return _aiBuffer; };
     virtual void setRotation(uint8_t rotation);
     virtual void setInvert(bool invert);
+    virtual void shutdown(bool enable);
 
 private:
     uint8_t* _dataBuffer;    // put RGB565 data