Hi ,
In My project , I am using TCA8418 controller for keypad matrix . Connected the Keypad controller to processor (IMX6) as a slave device and I want to use both keypad & GPIO's simultaneously.
* Here i have used 5 rows (R0,R1,R2,R3,R4) & 3 Columns (C0,C1,C2) for keypad purpose .
* Remaining 10 GPIO's : 3 GPIO's used for LED control (O/P) [ R5,R6,R7]
* Other Gpio's used as GPIO Input to read board version ID and Type [C3,C4,C5,C6,C7,C8,C9]
I am facing 2 issues , Plz find the issues below.
- I have configured 3 rows as O/P and remaining GPIO's as input (default is input only). I dont want any GPIO interrupts here ... So i have not configured GPIO's interrupts.
- I have Disabled the Internal PULLUP for 10 GPIO's . Even though i disabled the pullup ,Its always high only .If i do pulldown externally ,it giving intermediate voltage as 1.1 V.
- How to read the GPIO input status , If i use GPIO_DAT_STATx register means its always shows same value and Its not clearing .
Please solve this issue ASAP.
Below i have post the register dump of the TCA8418 controller . Please check the configuration by using reg dump.
i2cdump -f -y 0 0x34
No size specified (using byte-data access)
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: c4 19 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ??..............
10: 00 00 00 00 3f 7f 03 20 00 00 00 00 00 1f 07 00 ....??? .....??.
20: 00 00 00 e0 00 00 00 00 00 1f 07 00 e0 f8 03 XX ...?.....??.???X
