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Fix issue #353, initialising glitch filter

This commit is contained in:
Bradley Pankow 2020-05-25 16:00:22 -04:00 committed by Guy McSwain
parent 5395bbed13
commit 328e09a5b0
1 changed files with 15 additions and 13 deletions
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28
pigpio.c
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@ -950,6 +950,7 @@ typedef struct
uint32_t nfRBitV;
uint32_t gfSteadyUs;
uint8_t gfInitialised;
uint32_t gfTick;
uint32_t gfLBitV;
uint32_t gfRBitV;
@ -5685,7 +5686,7 @@ unsigned alert_delays[]=
static void alertGlitchFilter(gpioSample_t *sample, int numSamples)
{
int i, j, diff;
uint32_t steadyUs, changedTick, RBitV, LBitV;
uint32_t steadyUs, changedTick, RBitV, LBitV, initialised;
uint32_t bit, bitV;
for (i=0; i<=PI_MAX_USER_GPIO; i++)
@ -5694,6 +5695,17 @@ static void alertGlitchFilter(gpioSample_t *sample, int numSamples)
if (monitorBits & bit & gFilterBits)
{
initialised = gpioAlert[i].gfInitialised;
if (!initialised && numSamples > 0)
{
/* Initialise filter with first sample */
bitV = sample[0].level & bit;
gpioAlert[i].gfRBitV = bitV;
gpioAlert[i].gfLBitV = bitV;
gpioAlert[i].gfTick = sample[0].tick;
gpioAlert[i].gfInitialised = 1;
}
steadyUs = gpioAlert[i].gfSteadyUs;
RBitV = gpioAlert[i].gfRBitV;
LBitV = gpioAlert[i].gfLBitV;
@ -12335,18 +12347,8 @@ int gpioGlitchFilter(unsigned gpio, unsigned steady)
if (steady)
{
gpioAlert[gpio].gfTick = systReg[SYST_CLO];
if (gpioRead_Bits_0_31() & (1<<gpio))
{
gpioAlert[gpio].gfLBitV = (1<<gpio);
gpioAlert[gpio].gfRBitV = 0 ;
}
else
{
gpioAlert[gpio].gfLBitV = 0 ;
gpioAlert[gpio].gfRBitV = (1<<gpio);
}
/* Initialise values next time we process alerts */
gpioAlert[gpio].gfInitialised = 0;
}
gpioAlert[gpio].gfSteadyUs = steady;