MAX1233/MAX1234触摸屏控制器入门

文章摘要：表11. 纠正触摸屏连接问题 SymptomCorrectionTouch coordinates are mirrored top-to-bottomSwap the Y+ and Y- connectionsTouch coordinates are mirrored left-to-rightSwap the X+ and X- connectionsTouch coordinates are rotated 180 degreesSwap the X+ and X- connections, and swap the Y+ and Y- connectionsTouch coordin

MAX1233/MAX1234触摸屏控制器入门,标签：计算机控制技术,工厂电气控制技术,http://www.88dzw.com

表11. 纠正触摸屏连接问题

Symptom	Correction
Touch coordinates are mirrored top-to-bottom	Swap the Y+ and Y- connections
Touch coordinates are mirrored left-to-right	Swap the X+ and X- connections
Touch coordinates are rotated 180 degrees	Swap the X+ and X- connections, and swap the Y+ and Y- connections
Touch coordinates are mirrored diagonally	Swap the X+ and Y+ connections, and swap the X- and Y- connections
Touch coordinates do not seem to track, and the distortion is not a simple flip/rotate/mirror transformation	Swap the X+ and Y+ connections; if distortion persists, swap the X+ and Y- connections; if distortion still persists, disconnect touch screen and use DVM to verify X+ to X- resistance and Y+ to Y- resistance; verify with no touch X+ and X- are isolated from Y+ and Y-

3.4) 检测触摸屏的操作：根据需要扫描

在配置MAX1234检测触摸屏操作，根据需要数字化接触屏的位置时，写入寄存器0x40 (ADC控制)，其PENSTS=0，ADSTS=0 (请参考MAX1233/MAX1234数据资料的表6)。读取寄存器0x00 (X轴)后，检测到后续的触摸屏操作时，/PENIRQ信号锁存至低电平，在写入ADC控制寄存器测量X、Y轴之前，保持低电平。

表12. 触摸屏检测命令序列：根据需要扫描

DEMO1234 Command	Action	SPI data in	Verification
T W AC 0b01	Demand scan	0x0040 0x0b01
T R AX	Read conversion result register X	0x8000 0x0000
P R 6	Read PENIRQ-bar pin status		PENIRQ = 1
	Touch the touch screen
P R 6	Read PENIRQ-bar pin status		PENIRQ = 0
T M2	Measure X,Y,Z1,Z2	0x0040 0x0b01 0x8000 0x0000 0x8001 0x0000 0x8002 0x0000 0x8003 0x0000
P R 6	Read PENIRQ-bar pin status		PENIRQ = 1
	Touch and hold the touch screen
P R 6	Read PENIRQ-bar pin status		PENIRQ = 0
T M2	Measure X,Y,Z1,Z2	0x0040 0x0b01 0x8000 0x0000 0x8001 0x0000 0x8002 0x0000 0x8003 0x0000
P R 6	Read PENIRQ-bar pin status		PENIRQ = 0
T M2	Measure X,Y,Z1,Z2	0x0040 0x0b01 0x8000 0x0000 0x8001 0x0000 0x8002 0x0000 0x8003 0x0000
P R 6	Read PENIRQ-bar pin status		PENIRQ = 0
	Release the touch screen
P R 6	Read PENIRQ-bar pin status		PENIRQ = 0
T M2	Measure X,Y,Z1,Z2	0x0040 0x0b01 0x8000 0x0000 0x8001 0x0000 0x8002 0x0000 0x8003 0x0000
P R 6	Read PENIRQ-bar pin status		PENIRQ = 1

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