MAX1233/MAX1234触摸屏控制器入门

时间：03-17 来源：互联网点击：

T R KB

Read raw keypad result

0x8004 0x0000

0x0040 = R3C2 key

4.4) 从键盘中屏蔽单个按键

使用键盘屏蔽寄存器和键盘2结果寄存器来屏蔽每个按键。屏蔽掉的按键被扫描至KPD寄存器，但是不在键盘2结果寄存器中报告。

表17. 按键命令序列：屏蔽单个按键

DEMO1234 Command	Action	SPI data in	Verification
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
T W KM 0020	Mask only R2C2 key	0x0050 0x0020
	Press and release R1C1 (key "1")
T R KB	Read raw keypad result	0x8004 0x0000	0x0001 = R1C1 key
T R K2	Read masked keypad result	0x8011 0x0000	0x0001 = R1C1 key
	Press and release R2C2 (key "5")
T R KB	Read raw keypad result	0x8004 0x0000	0x0020 = R2C2 key
T R K2	Read masked keypad result	0x8011 0x0000	0x0000 = no key
	Press and release R3C2 (key "8")
T R KB	Read raw keypad result	0x8004 0x0000	0x0040 = R3C2 key
T R K2	Read masked keypad result	0x8011 0x0000	0x0040 = R3C2 key

4.5) 从键盘中屏蔽一列

使用键盘列寄存器来屏蔽所有列。不扫描屏蔽列，因此，KPD寄存器不会探测这些列中的按键。

表18. 按键命令序列：屏蔽键盘的一列

DEMO1234 Command	Action	SPI data in	Verification
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
T W KK 2000	Mask entire C2 column	0x0051 0x2000
	Press and release R1C1 (key "1")
T R KB	Read raw keypad result	0x8004 0x0000	0x0001 = R1C1 key
	Press and release R2C2 (key "5")
T R KB	Read raw keypad result	0x8004 0x0000	(previous value)
	Press and release R3C2 (key "8")
T R KB	Read raw keypad result	0x8004 0x0000	(previous value)
	Press and release R2C3 (key "6")
T R KB	Read raw keypad result	0x8004 0x0000	0x0200 = R2C3 key

5) 电源管理

表19. 关断命令

DEMO1234 Command	Action	SPI data in	Verification
T W AC C000	Power off ADC	0x0040 0xc000	—
T W AC 0300	Power off internal reference	0x0040 0x0300	REF = not driven
T W DC 8000	Disable DAC	0x0042 0x8000	DACOUT = 0.0V
T W KC C000	Power off keypad	0x0041 0xc000	—

6) 菜单系统

全部源代码实现下面的控制台菜单系统，它连接至MINIQUSB+模块。

CmodComm测试程序主菜单—在连接前
A) adjust timing parameters
L) CmodLog... functions
C) connect
D) Debug Messages
X) exit

对C (连接)命令的响应
C
Hardware supports optimized native SMBus commands.

Board connected.

Got board banner: Maxim MINIQUSB V01.05.41 >
Firmware version is OK.
(configured for SPI auto-CS 4-byte mode) (SCLK=2MHz) ...

主菜单—连接后有效
T) Test the device
8) CmodP8Bus... functions
A) adjust timing parameters
L) CmodLog... functions
P) CmodPin... functions
S) CmodSpi... functions
M) CmodSMBus... functions
$) CmodCommStringWrite list of hex codes

R) CmodBoardReset
D) Disconnect

测试菜单命令—连接后有效
R) Read register
W) Write register
M0) measure no measurement; configure reference
M1) measure X,Y
M2) measure X,Y,Z1,Z2
M3) measure X
M4) measure Y
M5) measure Z1,Z2
M6) measure BAT1/4
M7) measure BAT2/4
M8) measure AUX1
M9) measure AUX2
MA) measure TEMP1
MB) measure BAT1/4,BAT2/4,AUX1,AUX2,TEMP1,TEMP2
MC) measure TEMP1,TEMP2
MD) no measurement; drive Y+,Y-
ME) no measurement; drive X+,X-
MF) no measurement; drive Y+,X-
.) Exit this menu

6.1) 寄存器读/写命令

表20. 读取寄存器助记符

DEMO1234 Command	Mnemonic	SPI data in
T R A1	Test Read AUX1 register	0x8007 0x0000
T R A2	Test Read AUX2 register	0x8008 0x0000
T R AC	Test Read ADC_control register	0x8040 0x0000
T R AX	Test Read X register	0x8000 0x0000
T R AY	Test Read Y register	0x8001 0x0000
T R AZ1	Test Read Z1 register	0x8002 0x0000
T R AZ2	Test Read Z2 register	0x8003 0x0000
T R B1	Test Read BAT1 register	0x8005 0x0000
T R B2	Test Read BAT2 register	0x8006 0x0000
T R DC	Test Read DAC_control register	0x8042 0x0000
T R DD	Test Read DAC_data register	0x800b 0x0000

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