Implementation of image switching for on-board DVR

Recently, we are developing an image switching function for the car recorder. The chip used for image switching is techwell tw8816.

The single-chip microcomputer is lpc1114/301, And the CPU is Samsung's s5pv210.

Android 2.3.4

Control the CPU gpio pinsAchieve multi-channel image Switching

The CPU and MCU have corresponding gpio connections,

1. Implement application control gpio feet

References

Modify the control permission of gpio: Compile gpiolib. c into kernel in the kernel

│ Location: │
│-> Device drivers │
│-> Gpio support (gpiolib [= y])

Modify the permissions of gpio in gpiolib. C to 0777.

The MCU detects the level change of this gpio foot,

Write the I2C array of techwell tw8816 imaging into MCU for image Switching

 

Project result: Image switching has been implemented on the platform