Allan Green
/
touchpad
..
touchpad.cpp
- Committer:
- allanalpha
- Date:
- 2013-02-01
- Revision:
- 0:ff5187998c84
File content as of revision 0:ff5187998c84:
/* Touchpad driver. CPV, 3/9/2009 */ #include "touchpad.h" void TouchpadChannel::initialise(int min, int quantise_step) { m_min = min; m_quantise_step = quantise_step; m_filter.initialise(8); m_quantised = -1; } int TouchpadChannel::quantise(void) { m_quantised = -1; int raw = m_filter(); if (raw>m_min) { m_quantised = 0; while(raw>m_quantise_step) { raw -= m_quantise_step; m_quantised += 1; } } return m_quantised; } //=============================================== Touchpad::Touchpad(PinName x0, PinName x1, PinName y0, PinName y1) { m_x0 = x0; m_x1 = x1; m_y0 = y0; m_y1 = y1; m_ch_x.initialise(0.1*0xffff,0.16*0xffff); m_ch_y.initialise(0.1*0xffff,0.22*0xffff); } int Touchpad::read(PinName drive_hi, PinName drive_lo, PinName read_hi, PinName read_lo) { DigitalOut out1(drive_hi); DigitalOut out0(drive_lo); AnalogIn in1(read_hi); AnalogIn in0(read_lo); out0 = 0; out1 = 1; return in1.read_u16(); } void Touchpad::tick(void) { m_ch_x.tick(read_x()); m_ch_y.tick(read_y()); }