Allan Green
/
touchpad
..
touchpad.cpp@0:ff5187998c84, 2013-02-01 (annotated)
- Committer:
- allanalpha
- Date:
- Fri Feb 01 15:24:15 2013 +0000
- Revision:
- 0:ff5187998c84
what ev
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
allanalpha | 0:ff5187998c84 | 1 | /* |
allanalpha | 0:ff5187998c84 | 2 | Touchpad driver. |
allanalpha | 0:ff5187998c84 | 3 | |
allanalpha | 0:ff5187998c84 | 4 | CPV, 3/9/2009 |
allanalpha | 0:ff5187998c84 | 5 | */ |
allanalpha | 0:ff5187998c84 | 6 | |
allanalpha | 0:ff5187998c84 | 7 | #include "touchpad.h" |
allanalpha | 0:ff5187998c84 | 8 | |
allanalpha | 0:ff5187998c84 | 9 | |
allanalpha | 0:ff5187998c84 | 10 | void TouchpadChannel::initialise(int min, int quantise_step) |
allanalpha | 0:ff5187998c84 | 11 | { |
allanalpha | 0:ff5187998c84 | 12 | m_min = min; |
allanalpha | 0:ff5187998c84 | 13 | m_quantise_step = quantise_step; |
allanalpha | 0:ff5187998c84 | 14 | m_filter.initialise(8); |
allanalpha | 0:ff5187998c84 | 15 | m_quantised = -1; |
allanalpha | 0:ff5187998c84 | 16 | } |
allanalpha | 0:ff5187998c84 | 17 | |
allanalpha | 0:ff5187998c84 | 18 | |
allanalpha | 0:ff5187998c84 | 19 | int TouchpadChannel::quantise(void) |
allanalpha | 0:ff5187998c84 | 20 | { |
allanalpha | 0:ff5187998c84 | 21 | m_quantised = -1; |
allanalpha | 0:ff5187998c84 | 22 | int raw = m_filter(); |
allanalpha | 0:ff5187998c84 | 23 | if (raw>m_min) |
allanalpha | 0:ff5187998c84 | 24 | { |
allanalpha | 0:ff5187998c84 | 25 | m_quantised = 0; |
allanalpha | 0:ff5187998c84 | 26 | while(raw>m_quantise_step) |
allanalpha | 0:ff5187998c84 | 27 | { |
allanalpha | 0:ff5187998c84 | 28 | raw -= m_quantise_step; |
allanalpha | 0:ff5187998c84 | 29 | m_quantised += 1; |
allanalpha | 0:ff5187998c84 | 30 | } |
allanalpha | 0:ff5187998c84 | 31 | } |
allanalpha | 0:ff5187998c84 | 32 | return m_quantised; |
allanalpha | 0:ff5187998c84 | 33 | } |
allanalpha | 0:ff5187998c84 | 34 | |
allanalpha | 0:ff5187998c84 | 35 | |
allanalpha | 0:ff5187998c84 | 36 | //=============================================== |
allanalpha | 0:ff5187998c84 | 37 | |
allanalpha | 0:ff5187998c84 | 38 | |
allanalpha | 0:ff5187998c84 | 39 | Touchpad::Touchpad(PinName x0, PinName x1, PinName y0, PinName y1) |
allanalpha | 0:ff5187998c84 | 40 | { |
allanalpha | 0:ff5187998c84 | 41 | m_x0 = x0; |
allanalpha | 0:ff5187998c84 | 42 | m_x1 = x1; |
allanalpha | 0:ff5187998c84 | 43 | m_y0 = y0; |
allanalpha | 0:ff5187998c84 | 44 | m_y1 = y1; |
allanalpha | 0:ff5187998c84 | 45 | m_ch_x.initialise(0.1*0xffff,0.16*0xffff); |
allanalpha | 0:ff5187998c84 | 46 | m_ch_y.initialise(0.1*0xffff,0.22*0xffff); |
allanalpha | 0:ff5187998c84 | 47 | } |
allanalpha | 0:ff5187998c84 | 48 | |
allanalpha | 0:ff5187998c84 | 49 | |
allanalpha | 0:ff5187998c84 | 50 | int Touchpad::read(PinName drive_hi, PinName drive_lo, PinName read_hi, PinName read_lo) |
allanalpha | 0:ff5187998c84 | 51 | { |
allanalpha | 0:ff5187998c84 | 52 | DigitalOut out1(drive_hi); |
allanalpha | 0:ff5187998c84 | 53 | DigitalOut out0(drive_lo); |
allanalpha | 0:ff5187998c84 | 54 | AnalogIn in1(read_hi); |
allanalpha | 0:ff5187998c84 | 55 | AnalogIn in0(read_lo); |
allanalpha | 0:ff5187998c84 | 56 | out0 = 0; |
allanalpha | 0:ff5187998c84 | 57 | out1 = 1; |
allanalpha | 0:ff5187998c84 | 58 | return in1.read_u16(); |
allanalpha | 0:ff5187998c84 | 59 | } |
allanalpha | 0:ff5187998c84 | 60 | |
allanalpha | 0:ff5187998c84 | 61 | |
allanalpha | 0:ff5187998c84 | 62 | void Touchpad::tick(void) |
allanalpha | 0:ff5187998c84 | 63 | { |
allanalpha | 0:ff5187998c84 | 64 | m_ch_x.tick(read_x()); |
allanalpha | 0:ff5187998c84 | 65 | m_ch_y.tick(read_y()); |
allanalpha | 0:ff5187998c84 | 66 | } |