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Fixed repeated press/release of a single key bug.

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Caveat: The problem is still there. When the averaging kicks in, there is a window of time where keypresses won't register
        This fix only delays the window a *really* long time, so the likelihood of hitting the delay is very low.
	Each keypress resets the countdown.
This commit is contained in:
Jacob Alexander 2014-04-25 02:06:40 -07:00
parent 1a5ae7fd68
commit c3e1335678
1 changed files with 46 additions and 39 deletions
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33
Scan/DPH/scan_loop.c
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@ -43,18 +43,8 @@
#define ADHSM 7
#define RIGHT_JUSTIFY 0
#define LEFT_JUSTIFY (0xff)
// set left or right justification here:
#define JUSTIFY_ADC RIGHT_JUSTIFY
#define ADLAR_MASK (1 << ADLAR)
#ifdef JUSTIFY_ADC
#define ADLAR_BITS ((ADLAR_MASK) & (JUSTIFY_ADC))
#else // defaults to right justification.
// Right justification of ADLAR
#define ADLAR_BITS 0
#endif
// full muxmask
#define FULL_MUX_MASK ((1 << MUX0) | (1 << MUX1) | (1 << MUX2) | (1 << MUX3) | (1 << MUX4))
@ -79,10 +69,17 @@
// Number of consecutive samples required to pass debounce
#define DEBOUNCE_THRESHOLD 5
// Scans to remain idle after all keys were release before starting averaging
// XXX So this makes the initial keypresses fast,
// but it's still possible to lose a keypress if you press at the wrong time -HaaTa
#define KEY_IDLE_SCANS 30000
// Total number of muxes/sense lines available
#define MUXES_COUNT 8
#define MUXES_COUNT_XSHIFT 3
#define WARMUP_LOOPS ( 2048 )
// Number of warm-up loops before starting to scan keys
#define WARMUP_LOOPS ( 1024 )
#define WARMUP_STOP (WARMUP_LOOPS - 1)
#define SAMPLE_CONTROL 3
@ -99,7 +96,6 @@
// mix in 1/4 of the current average to the running average. -> (@mux_mix = 2)
#define MUX_MIX 2
#define IDLE_COUNT_MASK 0xff
#define IDLE_COUNT_SHIFT 8
// av = (av << shift) - av + sample; av >>= shift
@ -183,6 +179,7 @@ uint16_t samples[MAX_STROBES][MUXES_COUNT]; // Overall table of cap sense ADC
uint16_t sampleMax[MAX_STROBES][MUXES_COUNT]; // Records the max seen ADC value
uint8_t key_activity = 0; // Increments for each detected key per each full scan of the keyboard, it is reset before each full scan
uint16_t key_idle = 0; // Defines how scans after all keys were released before starting averaging again
uint8_t key_release = 0; // Indicates if going from key press state to release state (some keys pressed to no keys pressed)
uint16_t threshold = THRESHOLD;
@ -494,6 +491,9 @@ inline void capsense_scan()
{
// No keypress, accumulate averages
if( !key_activity )
{
// Only start averaging once the idle counter has counted down to 0
if ( key_idle == 0 )
{
// Average Debugging
if ( enableAvgDebug )
@ -531,6 +531,12 @@ inline void capsense_scan()
// No key presses detected, set key_release indicator
key_release = 1;
}
// Otherwise decrement the idle counter
else
{
key_idle--;
}
}
// Keypresses, reset accumulators
else if ( key_release )
{
@ -779,6 +785,7 @@ void testColumn( uint8_t strobe )
{
column |= bit;
key_activity++; // No longer idle, stop averaging ADC data
key_idle = KEY_IDLE_SCANS; // Reset idle count-down
// Only register keypresses once the warmup is complete, or not enough debounce info
if ( keys_debounce[key] <= DEBOUNCE_THRESHOLD )