CQ Publishing / MARMEX_VB

MARMEX-VB : "Mary Camera module" library

Dependents:   MARMEX_VB_test MARMEX_VB_Hello

MARMEX-VB (MARY-VB) camera module library for mbed. (This module may be available in Japan only.)

Kown problem / 既知の問題

The read data may have contouring. In this case, it may require reset or changing order of data reading. The order change API is available as "read_order_change()" function.
カメラから読み出したデータに擬似輪郭が発生することがあります．この問題にはシステム全体のリセットを行うか，または読み出し順の変更を行うことで対処して下さい．読み出し順の変更はAPIの"read_order_change()"関数を使うことができます．

Diff: MARMEX_VB.cpp

Revision:
1:b2324313d4da
Parent:
0:c4d14dd5d479
Child:
2:88213c3ca312
--- a/MARMEX_VB.cpp	Fri Jun 06 03:36:58 2014 +0000
+++ b/MARMEX_VB.cpp	Mon Jun 09 19:41:32 2014 +0000
@@ -1,7 +1,7 @@
 /** MARMEX_VB Camera control library
  *
  *  @class   MARMEX_VB
- *  @version 0.1
+ *  @version 0.2
  *  @date    10-Jun-2014
  *
  *  Released under the Apache License, Version 2.0 : http://mbed.org/handbook/Apache-Licence
@@ -102,6 +102,7 @@
 
     //  SPI settings
 
+
     _cs     = 1;                        //  set ChipSelect signal HIGH
     _spi.format( 8 );                   //  camera SPI : 8bits/transfer
     _spi.frequency( SPI_FREQUENCY );    //  SPI frequency setting
@@ -193,8 +194,6 @@
             _vertical_size      = VGA_LINE_PER_FRAME / 4;
             break;
     }
-
-printf( "resolution : h,v = %d,%d\r\n", _horizontal_size, _vertical_size );
 #endif
 
     return _error_state;    //  return non-zero if I2C access failed
@@ -275,12 +274,88 @@
 
     } else {
 
+#define OPTIMIZE_BY_GPIO_REGISTER_ACCESS
+#if defined( TARGET_MBED_LPC1768 ) && defined (OPTIMIZE_BY_GPIO_REGISTER_ACCESS )
+        //  optimized by IO register access and loop unroll
+        LPC_GPIO2->FIOMASK  = ~0x10;
+
+        char    reg = COMMAND_READ | CAMERA_DATA_REGISTER | COMMAND_ADDR_INCREMENT;
+
+        for( int x = 0; x < n_of_pixels; x += 8 ) {
+            //  perform 2 bytes read. a pixel data is in RGB565 format (16bits)
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p  = _spi.write( reg );
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p++  |= _spi.write( reg ) << 8;
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p  = _spi.write( reg );
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p++  |= _spi.write( reg ) << 8;
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p  = _spi.write( reg );
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p++  |= _spi.write( reg ) << 8;
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p  = _spi.write( reg );
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p++  |= _spi.write( reg ) << 8;
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p  = _spi.write( reg );
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p++  |= _spi.write( reg ) << 8;
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p  = _spi.write( reg );
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p++  |= _spi.write( reg ) << 8;
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p  = _spi.write( reg );
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p++  |= _spi.write( reg ) << 8;
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p  = _spi.write( reg );
+            LPC_GPIO2->FIOSET   = 0x10;
+
+            LPC_GPIO2->FIOCLR   = 0x10;
+            *p++  |= _spi.write( reg ) << 8;
+            LPC_GPIO2->FIOSET   = 0x10;
+        }
+
+#else
         for( int x = 0; x < n_of_pixels; x++ ) {
             //  perform 2 bytes read. a pixel data is in RGB565 format (16bits)
             tmp     = read_register( CAMERA_DATA_REGISTER );                //  read lower byte
             *p++    = (read_register( CAMERA_DATA_REGISTER ) << 8) | tmp;   //  read upper byte
         }
-
+#endif
     }
 
 #endif
@@ -347,8 +422,8 @@
     int     tmp;
 
     //  SPI access
-
     _cs     = 0;
+    LPC_GPIO2->FIOCLR   = 0x10;
     tmp     = _spi.write( data );
     _cs     = 1;