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Reworked check for input taking too long

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DavePutz 2020-09-14 10:54:57 -05:00 committed by GitHub
parent 6b93f97de1
commit c014ac3089
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 14 additions and 4 deletions
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18
ports/atmel-samd/common-hal/pulseio/PulseIn.c
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@ -51,6 +51,7 @@ static uint8_t refcount = 0;
static uint8_t pulsein_tc_index = 0xff;
volatile static uint32_t overflow_count = 0;
volatile static uint32_t start_overflow = 0;
void pulsein_timer_interrupt_handler(uint8_t index) {
if (index != pulsein_tc_index) return;
@ -91,6 +92,9 @@ void pulsein_interrupt_handler(uint8_t channel) {
uint32_t current_count = tc->COUNT16.COUNT.reg;
pulseio_pulsein_obj_t* self = get_eic_channel_data(channel);
if (self->len == 0 ) {
start_overflow = overflow_count;
}
if (self->first_edge) {
self->first_edge = false;
pulsein_set_config(self, false);
@ -110,16 +114,21 @@ void pulsein_interrupt_handler(uint8_t channel) {
if (total_diff < duration) {
duration = total_diff;
}
//check if the input is taking too long, 15 timer overflows is approx 1 second
if (current_overflow - start_overflow > 15) {
self->errored_too_fast = true;
common_hal_pulseio_pulsein_pause(self);
common_hal_mcu_enable_interrupts();
return;
}
uint16_t i = (self->start + self->len) % self->maxlen;
self->buffer[i] = duration;
if (self->len < self->maxlen) {
self->len++;
} else {
self->errored_too_fast = true;
common_hal_mcu_enable_interrupts();
return;
self->start++;
}
self->buffer[i] = duration;
}
self->last_overflow = current_overflow;
self->last_count = current_count;
@ -300,6 +309,7 @@ uint16_t common_hal_pulseio_pulsein_popleft(pulseio_pulsein_obj_t* self) {
mp_raise_IndexError(translate("pop from an empty PulseIn"));
}
if (self->errored_too_fast) {
self->errored_too_fast = 0;
mp_raise_RuntimeError(translate("Input taking too long"));
}
common_hal_mcu_disable_interrupts();