MAX1233/MAX1234触摸屏控制器入门

[09-13 17:05:19]   来源：http://www.88dzw.com  控制技术   阅读：8648次

文章摘要：4.2) 读写GPIO引脚GPIO数据寄存器读取GPIO输入引脚，写入GPIO输出引脚。注意：在这些例子中，C3、C4和R4是引脚名称，而不是元件名称。表15. GPIO实例 DEMO1234 CommandActionSPI data inVerificationT W GC C8C0Keypad:(C2,C1) x (R3,R2,R1);GPIO outputs: C4,C3;GPIO input: R40x004f 0xc8c0T W GP 4000GPIO pullup disable: C30x004e 0x4000Connect external resistor between

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

4.2) 读写GPIO引脚

GPIO数据寄存器读取GPIO输入引脚，写入GPIO输出引脚。注意：在这些例子中，C3、C4和R4是引脚名称，而不是元件名称。

表15. GPIO实例 
DEMO1234 Command
 Action 
SPI data in
 Verification
T W GC C8C0
 Keypad:
(C2,C1) x (R3,R2,R1);
GPIO outputs: C4,C3;
GPIO input: R4		 
0x004f 0xc8c0
 
T W GP 4000
 GPIO pullup disable: C3 
0x004e 0x4000
Connect external resistor between C3 pin and DVDD
Connect DVM to C4 pin 
T W GD 8000
 GPIO write C4 = 1 
0x000f 0x8000
 C4 pin = high
T W GD 0000
 GPIO write C4 = 0 
0x000f 0x0000
 C4 pin = low
T W GD 8000
 GPIO write C4 = 1 
0x000f 0x8000
 C4 pin = high
T W GD 0000
 GPIO write C4 = 0 
0x000f 0x0000
 C4 pin = low
Connect DVM to C3 pin 
T W GD 4000
 GPIO write C3 = 1 
0x000f 0x4000
 C3 pin = high
T W GD 0000
 GPIO write C3 = 0 
0x000f 0x0000
 C3 pin = low
T W GD 4000
 GPIO write C3 = 1 
0x000f 0x4000
 C3 pin = high
T W GD 0000
 GPIO write C3 = 0 
0x000f 0x0000
 C3 pin = low
Connect R4 pin to DVDD 
T R GD
 GPIO read 
0x800f 0x0000
 Buffer = 0x0800
Connect R4 pin to GND 
T R GD
 GPIO read 
0x800f 0x0000
 Buffer = 0x0000

4.3) 检测按键：自动扫描

可以配置键盘控制寄存器在探测到有按键按下时，自动扫描键盘。

表16. 按键命令序列：自动扫描 
DEMO1234 Command
 Action 
SPI data in
 Verification
Optional: connect oscilloscope to KEYIRQ-bar 
I C 0 3
 Configure KEYIRQ-bar pulse accumulator: falling-edge trigger 
I 0 0
 Reset the pulse accumulator 
I R 0
 Read the number of times KEYIRQ-bar has pulsed low count = 0
T W GC 0000
 Keypad:
(C4,C3,C2,C1) x (R4,R3,R2,R1);
GPIO outputs: none;
GPIO inputs: none		 
0x004f 0x0000
 
T W KC bf00
 Wait for keypress;
maximum debounce and hold times		 
0x0041 0xbf00
Press and release R1C1 (key "1") KEYIRQ pulse
I R 0
 Read the number of times KEYIRQ-bar has pulsed low count has increased
T R KB
 Read raw keypad result 
0x8004 0x0000
 0x0001 = R1C1 key
Press and release R2C2 (key "5") KEYIRQ pulse
I R 0
 Read the number of times KEYIRQ-bar has pulsed low count has increased
T R KB
 Read raw keypad result 
0x8004 0x0000
 0x0020 = R2C2 key
Press and release R3C2 (key "8") KEYIRQ pulse
I R 0
 Read the number of times KEYIRQ-bar has pulsed low count has increased
T R KB
 Read raw keypad result 
0x8004 0x0000
 0x0040 = R3C2 key

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Tag:控制技术，计算机控制技术,工厂电气控制技术，控制技术

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