
RSB-4210 User Manual viii
3.10.1 What is a GPIO?......................................................................... 54
3.10.2 Paths in Sysfs ............................................................................. 55
3.10.3 GPIO Mapping Table .................................................................. 57
3.11 Interface Device Reference Documentation ........................................... 57
3.11.1 I2C .............................................................................................. 57
3.11.2 C example................................................................................... 57
3.11.3 UART .......................................................................................... 61
3.11.4 CAN bus ..................................................................................... 71
3.11.5 SD card /iNand /USB Disk/SATA Disk........................................ 77
3.11.6 LAN............................................................................................. 78
3.11.7 RTC ............................................................................................ 78
3.11.8 WatchDog ................................................................................... 86
3.11.9 Audio........................................................................................... 90
3.11.10Keypad/Touchscreen.................................................................. 90
3.12 Backlight Adjustment .............................................................................. 95
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