15-03-2017, 04:03 PM
8051 Driver to connect the ADS7846 / 7843 chip suitable for use in 4-wire touch screen, is through a standard SPI protocol and communication of the CPU, simple operation and high precision, when the touch screen is pressed (ie , Touching the incident) ADS7846 issued to the CPU interrupt request, the CPU on request, was delayed and then respond to your request, the purpose is to eliminate jitter sampling allows more accuracy. If a sample is not accurate, you can try many times the last time you check the sampling results, which is also intended to eliminate jitter.
