1 | //========================================================================== |
---|
2 | // |
---|
3 | // ad7843.h |
---|
4 | // |
---|
5 | // Author(s): Michael Kelly, Cogent Computer Systems, Inc. |
---|
6 | // Contributors: |
---|
7 | // Date: 03/06/03 |
---|
8 | // Description: This file contains register offsets and bit defines |
---|
9 | // for the Analog Devices AD7843 Touch Screen Controller |
---|
10 | // |
---|
11 | |
---|
12 | // |
---|
13 | // Bit positions for AD7843 Control byte |
---|
14 | // |
---|
15 | #define AD7843_S 0x80 // Start bit, always 1 |
---|
16 | #define AD7843_8BIT 0x08 // 0 = 12-bit conversion, 1 = 8-bits |
---|
17 | #define AD7843_SER 0x04 // 0 = Differential, 1 = Single ended |
---|
18 | |
---|
19 | // Address select defines for Single-Ended mode |
---|
20 | #define AD7843_ADD_SER_Y (AD7843_SER | (0x1 << 4)) // Y position measurement |
---|
21 | #define AD7843_ADD_SER_IN3 (AD7843_SER | (0x2 << 4)) // auxillary input 1 measurement |
---|
22 | #define AD7843_ADD_SER_X (AD7843_SER | (0x5 << 4)) // X position measurement |
---|
23 | #define AD7843_ADD_SER_IN4 (AD7843_SER | (0x6 << 4)) // auxillary input 2 measurement |
---|
24 | |
---|
25 | // Address select defines for Differential mode |
---|
26 | #define AD7843_ADD_DFR_Y (0x1 << 4) // Y position measurement |
---|
27 | #define AD7843_ADD_DFR_X (0x5 << 4) // X position measurement |
---|
28 | |
---|
29 | // Power Down Modes |
---|
30 | #define AD7843_PD_MOD0 0x0 // low-power mode, no power-up delay, *IRQ is enabled |
---|
31 | #define AD7843_PD_MOD1 0x1 // same as low-power mode, except *IRQ is disabled |
---|
32 | #define AD7843_PD_MOD2 0x2 // device on, *IRQ is enabled |
---|
33 | #define AD7843_PD_MOD3 0x3 // device on, *IRQ is disabled |
---|
34 | |
---|
35 | //#define AD7843_GPIOMODE |
---|