User manual

2.3.2 CN2 90pin DIP Interface (left row) ............................................ 21
2.3.3 CN3 JTAG Interface ................................................................ 25
2.3.4 CN4 Camera Interface ............................................................ 25
2.3.5 LED Indicators ....................................................................... 27
2.4 Interfaces on Expansion Board ....................................... 27
2.4.1 Power Jack ........................................................................... 28
2.4.2 TFT_LCD Interface ................................................................. 28
2.4.3 Audio Output Interface ........................................................... 31
2.4.4 Audio Input Interface.............................................................. 31
2.4.5 Serial Interface ...................................................................... 31
2.4.6 Ethernet Interface .................................................................. 32
2.4.7 USB OTG Interface ................................................................. 32
2.4.8 USB HOST Interface ............................................................... 33
2.4.9 SD Card Interface .................................................................. 33
2.4.10 LED Indicators ..................................................................... 34
2.4.11 Buttons .............................................................................. 34
3 Linux Operating System ................................................. 35
3.1 Structure of the Embedded Linux System......................... 35
3.2 Software Features ........................................................ 36
3.3 System Development Process ........................................ 37
3.3.1 Building Development Environment ........................................... 37
3.3.2 System Compilation ............................................................... 38
3.3.3 Customizing the System .......................................................... 41
3.4 Introduction to Drivers .................................................. 42
3.4.1 NAND Flash Driver ................................................................. 45
3.4.2 SD/MMC Driver ...................................................................... 46
3.4.3 Display Subsystem Driver ........................................................ 47
3.4.4 Video Capture Driver .............................................................. 48
3.4.5 Audio Input/Output Driver ....................................................... 50
3.5 Driver Development ..................................................... 51
3.5.1 GPIO_Keys Driver .................................................................. 51
3.5.2 GPIO_LEDs Driver .................................................................. 56