lemming lemming
Adjusts the great pinscape controller to work with a cheap linear potentiometer instead of the expensive CCD array
Fork of
Pinscape_Controller
by 
Mike R
Diff: main.cpp
- Revision:
- 9:fd65b0a94720
- Parent:
- 8:c732e279ee29
- Child:
- 10:976666ffa4ef
--- a/main.cpp Fri Aug 08 20:59:39 2014 +0000
+++ b/main.cpp Mon Aug 18 21:46:10 2014 +0000
@@ -171,7 +171,16 @@
// byte 2 = new LedWiz unit number, 0x01 to 0x0f
// byte 3 = feature enable bit mask:
// 0x01 = enable CCD (default = on)
-
+//
+// Plunger calibration mode: the host can activate plunger calibration mode
+// by sending this packet. This has the same effect as pressing and holding
+// the plunger calibration button for two seconds, to allow activating this
+// mode without attaching a physical button.
+//
+// length = 8 bytes
+// byte 0 = 65 (0x41)
+// byte 1 = 2 (0x02)
+//
#include "mbed.h"
#include "math.h"
@@ -220,6 +229,22 @@
const uint16_t USB_VERSION_NO = 0x0006;
const uint8_t DEFAULT_LEDWIZ_UNIT_NUMBER = 0x07;
+// Number of pixels we read from the sensor on each frame. This can be
+// less than the physical pixel count if desired; we'll read every nth
+// piexl if so. E.g., with a 1280-pixel physical sensor, if npix is 320,
+// we'll read every 4th pixel. It takes time to read each pixel, so the
+// fewer pixels we read, the higher the refresh rate we can achieve.
+// It's therefore better not to read more pixels than we have to.
+//
+// VP seems to have an internal resolution in the 8-bit range, so there's
+// no apparent benefit to reading more than 128-256 pixels when using VP.
+// Empirically, 160 pixels seems about right. The overall travel of a
+// standard pinball plunger is about 3", so 160 pixels gives us resolution
+// of about 1/50". This seems to take full advantage of VP's modeling
+// ability, and is probably also more precise than a human player's
+// perception of the plunger position.
+const int npix = 160;
+
// On-board RGB LED elements - we use these for diagnostic displays.
DigitalOut ledR(LED1), ledG(LED2), ledB(LED3);
@@ -302,23 +327,24 @@
{ PTD5, true }, // pin J2-4, LW port 8 (PWM capable - TPM 0.5 = channel 6)
{ PTD0, true }, // pin J2-6, LW port 9 (PWM capable - TPM 0.0 = channel 1)
{ PTD3, true }, // pin J2-10, LW port 10 (PWM capable - TPM 0.3 = channel 4)
- { PTC8, false }, // pin J1-14, LW port 11
- { PTC9, false }, // pin J1-16, LW port 12
- { PTC7, false }, // pin J1-1, LW port 13
- { PTC0, false }, // pin J1-3, LW port 14
- { PTC3, false }, // pin J1-5, LW port 15
- { PTC4, false }, // pin J1-7, LW port 16
- { PTC5, false }, // pin J1-9, LW port 17
- { PTC6, false }, // pin J1-11, LW port 18
- { PTC10, false }, // pin J1-13, LW port 19
- { PTC11, false }, // pin J1-15, LW port 20
- { PTC12, false }, // pin J2-1, LW port 21
- { PTC13, false }, // pin J2-3, LW port 22
- { PTC16, false }, // pin J2-5, LW port 23
- { PTC17, false }, // pin J2-7, LW port 24
- { PTA16, false }, // pin J2-9, LW port 25
- { PTA17, false }, // pin J2-11, LW port 26
- { PTE31, false }, // pin J2-13, LW port 27
+ { PTD2, false }, // pin J2-8, LW port 11
+ { PTC8, false }, // pin J1-14, LW port 12
+ { PTC9, false }, // pin J1-16, LW port 13
+ { PTC7, false }, // pin J1-1, LW port 14
+ { PTC0, false }, // pin J1-3, LW port 15
+ { PTC3, false }, // pin J1-5, LW port 16
+ { PTC4, false }, // pin J1-7, LW port 17
+ { PTC5, false }, // pin J1-9, LW port 18
+ { PTC6, false }, // pin J1-11, LW port 19
+ { PTC10, false }, // pin J1-13, LW port 20
+ { PTC11, false }, // pin J1-15, LW port 21
+ { PTC12, false }, // pin J2-1, LW port 22
+ { PTC13, false }, // pin J2-3, LW port 23
+ { PTC16, false }, // pin J2-5, LW port 24
+ { PTC17, false }, // pin J2-7, LW port 25
+ { PTA16, false }, // pin J2-9, LW port 26
+ { PTA17, false }, // pin J2-11, LW port 27
+ { PTE31, false }, // pin J2-13, LW port 28
{ PTD6, false }, // pin J2-17, LW port 29
{ PTD7, false }, // pin J2-19, LW port 30
{ PTE0, false }, // pin J2-18, LW port 31
@@ -343,6 +369,12 @@
// ---------------------------------------------------------------------------
+// utilities
+
+// number of elements in an array
+#define countof(x) (sizeof(x)/sizeof((x)[0]))
+
+// ---------------------------------------------------------------------------
//
// LedWiz emulation
//
@@ -381,7 +413,7 @@
// initialize the output pin array
void initLwOut()
{
- for (int i = 0 ; i < sizeof(lwPin) / sizeof(lwPin[0]) ; ++i)
+ for (int i = 0 ; i < countof(lwPin) ; ++i)
{
PinName p = ledWizPortMap[i].pin;
lwPin[i] = (ledWizPortMap[i].isPWM
@@ -467,6 +499,15 @@
iap.program_flash(addr, this, sizeof(*this));
}
+ // reset calibration data for calibration mode
+ void resetPlunger()
+ {
+ // set extremes for the calibration data
+ d.plungerMax = 0;
+ d.plungerZero = npix;
+ d.plungerMin = npix;
+ }
+
// stored data (excluding the checksum)
struct
{
@@ -640,7 +681,7 @@
tInt_.start();
}
- void get(int &x, int &y, int &rx, int &ry)
+ void get(int &x, int &y)
{
// disable interrupts while manipulating the shared data
__disable_irq();
@@ -711,14 +752,6 @@
x = rawToReport(vx);
y = rawToReport(vy);
- // apply a small dead zone near the center
- // if (abs(x) < 6) x = 0;
- // if (abs(y) < 6) y = 0;
-
- // report the calibrated instantaneous acceleration in rx,ry
- rx = int(round((ax - cx_)*JOYMAX));
- ry = int(round((ay - cy_)*JOYMAX));
-
#ifdef DEBUG_PRINTF
if (x != 0 || y != 0)
printf("%f %f %d %d %f\r\n", vx, vy, x, y, dt);
@@ -874,22 +907,6 @@
// check for valid flash
bool flash_valid = flash->valid();
- // Number of pixels we read from the sensor on each frame. This can be
- // less than the physical pixel count if desired; we'll read every nth
- // piexl if so. E.g., with a 1280-pixel physical sensor, if npix is 320,
- // we'll read every 4th pixel. It takes time to read each pixel, so the
- // fewer pixels we read, the higher the refresh rate we can achieve.
- // It's therefore better not to read more pixels than we have to.
- //
- // VP seems to have an internal resolution in the 8-bit range, so there's
- // no apparent benefit to reading more than 128-256 pixels when using VP.
- // Empirically, 160 pixels seems about right. The overall travel of a
- // standard pinball plunger is about 3", so 160 pixels gives us resolution
- // of about 1/50". This seems to take full advantage of VP's modeling
- // ability, and is probably also more precise than a human player's
- // perception of the plunger position.
- const int npix = 160;
-
// if the flash is valid, load it; otherwise initialize to defaults
if (flash_valid) {
memcpy(&cfg, flash, sizeof(cfg));
@@ -918,7 +935,6 @@
// plunger calibration button debounce timer
Timer calBtnTimer;
calBtnTimer.start();
- int calBtnDownTime = 0;
int calBtnLit = false;
// Calibration button state:
@@ -957,10 +973,16 @@
// so when we detect the start of this motion, we immediately tell VP
// to return the plunger to rest, then we monitor the real plunger
// until it atcually stops.
- bool firing = false;
+ int firing = 0;
// start the first CCD integration cycle
ccd.clear();
+
+ // Device status. We report this on each update so that the host config
+ // tool can detect our current settings. This is a bit mask consisting
+ // of these bits:
+ // 0x01 -> plunger sensor enabled
+ uint16_t statusFlags = (cfg.d.ccdEnabled ? 0x01 : 0x00);
// we're all set up - now just loop, processing sensor reports and
// host requests
@@ -1009,7 +1031,7 @@
// message type.
if (data[1] == 1)
{
- // Set Configuration:
+ // 1 = Set Configuration:
// data[2] = LedWiz unit number (0x00 to 0x0f)
// data[3] = feature enable bit mask:
// 0x01 = enable CCD
@@ -1022,9 +1044,26 @@
cfg.d.ledWizUnitNo = newUnitNo;
cfg.d.ccdEnabled = data[3] & 0x01;
+ // update the status flags
+ statusFlags = (statusFlags & ~0x01) | (data[3] & 0x01);
+
+ // if the ccd is no longer enabled, use 0 for z reports
+ if (!cfg.d.ccdEnabled)
+ z = 0;
+
// save the configuration
cfg.save(iap, flash_addr);
}
+ else if (data[1] == 2)
+ {
+ // 2 = Calibrate plunger
+ // (No parameters)
+
+ // enter calibration mode
+ calBtnState = 3;
+ calBtnTimer.reset();
+ cfg.resetPlunger();
+ }
}
else
{
@@ -1057,38 +1096,32 @@
case 0:
// button not yet pushed - start debouncing
calBtnTimer.reset();
- calBtnDownTime = calBtnTimer.read_ms();
calBtnState = 1;
break;
case 1:
// pushed, not yet debounced - if the debounce time has
// passed, start the hold period
- if (calBtnTimer.read_ms() - calBtnDownTime > 50)
+ if (calBtnTimer.read_ms() > 50)
calBtnState = 2;
break;
case 2:
// in the hold period - if the button has been held down
// for the entire hold period, move to calibration mode
- if (calBtnTimer.read_ms() - calBtnDownTime > 2050)
+ if (calBtnTimer.read_ms() > 2050)
{
// enter calibration mode
calBtnState = 3;
-
- // set extremes for the calibration data, so that the actual
- // values we read will set new high/low water marks on the fly
- cfg.d.plungerMax = 0;
- cfg.d.plungerZero = npix;
- cfg.d.plungerMin = npix;
+ calBtnTimer.reset();
+ cfg.resetPlunger();
}
break;
case 3:
- // Already in calibration mode - pushing the button in this
- // state doesn't change the current state, but we won't leave
- // this state as long as it's held down. We can simply do
- // nothing here.
+ // Already in calibration mode - pushing the button here
+ // doesn't change the current state, but we won't leave this
+ // state as long as it's held down. So nothing changes here.
break;
}
}
@@ -1101,8 +1134,7 @@
// Otherwise, return to the base state without saving anything.
// If the button is released before we make it to calibration
// mode, it simply cancels the attempt.
- if (calBtnState == 3
- && calBtnTimer.read_ms() - calBtnDownTime > 17500)
+ if (calBtnState == 3 && calBtnTimer.read_ms() > 15000)
{
// exit calibration mode
calBtnState = 0;
@@ -1127,7 +1159,7 @@
{
case 2:
// in the hold period - flash the light
- newCalBtnLit = (((calBtnTimer.read_ms() - calBtnDownTime)/250) & 1);
+ newCalBtnLit = ((calBtnTimer.read_ms()/250) & 1);
break;
case 3:
@@ -1150,13 +1182,13 @@
calBtnLed = 1;
ledR = 1;
ledG = 1;
- ledB = 1;
+ ledB = 0;
}
else {
calBtnLed = 0;
ledR = 1;
ledG = 1;
- ledB = 0;
+ ledB = 1;
}
}
@@ -1246,14 +1278,34 @@
// is complete, allowing VP to carry out the firing motion using
// its internal model plunger rather than trying to track the
// intermediate positions of the mechanical plunger throughout
- // the firing motion. This has several benefits. First is that
- // our readings aren't very accurate during rapid movement,
- // because we get too much motion blur. Second is that the
- // event approach allows VP to simulate the plunger motion
- // according to each table's particular plunger settings.
- // Different tables have different plunger strengths and speeds,
- // so we want to defer to the model for the physics of the firing
- // motion within each simulation.
+ // the firing motion. This is essential because the firing
+ // motion is too fast for us to track - in the time it takes us
+ // to read one frame, the plunger can make it all the way to the
+ // zero position and bounce back halfway. Fortunately, the range
+ // of motions for the plunger is limited, so if we see any rapid
+ // change of position toward the rest position, it's reasonably
+ // safe to interpret it as a firing event.
+ //
+ // This isn't foolproof. The user can trick us by doing a
+ // controlled rapid forward push but stopping short of the rest
+ // position. We'll misinterpret that as a firing event. But
+ // that's not a natural motion that a user would make with a
+ // plunger, so it's probably an acceptable false positive.
+ //
+ // Possible future enhancement: we could add a second physical
+ // sensor that detects when the plunger reaches the zero position
+ // and asserts an interrupt. In the interrupt handler, set a
+ // flag indicating the zero position signal. On each scan of
+ // the CCD, also check that flag; if it's set, enter firing
+ // event mode just as we do now. The key here is that the
+ // secondary sensor would have to be something much faster
+ // than our CCD scan - it would have to react on, say, the
+ // millisecond time scale. A simple mechanical switch or a
+ // proximity sensor could work. This would let us detect
+ // with certainty when the plunger physically fires, eliminating
+ // the case where the use can fool us with motion that's fast
+ // enough to look like a release but doesn't actually reach the
+ // starting position.
//
// To detremine when a firing even occurs, we watch for rapid
// motion from a retracted position towards the rest position -
@@ -1264,12 +1316,38 @@
// position, and then suspend reports until the mechanical
// readings indicate that the plunger has come to rest (indicated
// by several readings in a row at roughly the same position).
-
- // Check to see if plunger firing is in progress. If not, check
- // to see if it looks like we just started firing.
- const int restTol = JOYMAX/npix * 4;
- const int fireTol = JOYMAX/npix * 12;
- if (firing)
+ //
+ // Tolerance for firing is 1/3 of the current pull distance, or
+ // about 1/2", whichever is greater. Making this value too small
+ // makes for too many false positives. Empirically, 1/4" is too
+ // twitchy, so set a floor at about 1/2". But we can be less
+ // sensitive the further back the plunger is pulled, since even
+ // a long pull will snap back quickly. Note that JOYMAX always
+ // corresponds to about 3", no matter how many pixels we're
+ // reading, since the physical sensor is about 3" long; so we
+ // factor out the pixel count calculate (approximate) physical
+ // distances based on the normalized axis range.
+ //
+ // Firing pattern: when firing, don't simply report a solid 0,
+ // but instead report a series of pseudo-bouces. This looks
+ // more realistic, beacause the real plunger is also bouncing
+ // around during this time. To get maximum firing power in
+ // the simulation, though, our pseudo-bounces are tiny cmopared
+ // to the real thing.
+ const int restTol = JOYMAX/24;
+ int fireTol = z/3 > JOYMAX/6 ? z/3 : JOYMAX/6;
+ static const int firePattern[] = {
+ -JOYMAX/12, -JOYMAX/12, -JOYMAX/12,
+ 0, 0, 0,
+ JOYMAX/16, JOYMAX/16, JOYMAX/16,
+ 0, 0, 0,
+ -JOYMAX/20, -JOYMAX/20, -JOYMAX/20,
+ 0, 0, 0,
+ JOYMAX/24, JOYMAX/24, JOYMAX/24,
+ 0, 0, 0,
+ -JOYMAX/30, -JOYMAX/30, -JOYMAX/30
+ };
+ if (firing != 0)
{
// Firing in progress - we've already told VP to send its
// model plunger all the way back to the rest position, so
@@ -1278,11 +1356,23 @@
if (abs(z0 - z2) < restTol && abs(znew - z2) < restTol)
{
// the plunger is back at rest - firing is done
- firing = false;
+ firing = 0;
// resume normal reporting
z = z2;
}
+ else if (firing < countof(firePattern))
+ {
+ // firing - report the next position in the pseudo-bounce
+ // pattern
+ z = firePattern[firing++];
+ }
+ else
+ {
+ // firing, out of pseudo-bounce items - just report the
+ // rest position
+ z = 0;
+ }
}
else if (z0 < z2 && z1 < z2 && znew < z2
&& (z0 < z2 - fireTol
@@ -1305,8 +1395,10 @@
// virtual plunger, rather than imposing the actual
// mechanical charateristics of the physical plunger on
// every table.
- firing = true;
- z = 0;
+ firing = 1;
+
+ // report the first firing pattern position
+ z = firePattern[0];
}
else
{
@@ -1320,10 +1412,16 @@
z1 = z0;
z0 = znew;
}
+ else
+ {
+ // plunger disabled - pause 10ms to throttle updates to a
+ // reasonable pace
+ wait_ms(10);
+ }
// read the accelerometer
- int xa, ya, rxa, rya;
- accel.get(xa, ya, rxa, rya);
+ int xa, ya;
+ accel.get(xa, ya);
// confine the results to our joystick axis range
if (xa < -JOYMAX) xa = -JOYMAX;
@@ -1342,7 +1440,7 @@
// arrangement of our nominal axes aligns with VP's standard
// setting, so that we can configure VP with X Axis = X on the
// joystick and Y Axis = Y on the joystick.
- js.update(y, x, z, rxa, rya, 0);
+ js.update(y, x, z, 0, statusFlags);
#ifdef DEBUG_PRINTF
if (x != 0 || y != 0)