*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
__xdata int32_t ao_quadrature_count[AO_QUADRATURE_COUNT];
static uint8_t ao_quadrature_state[AO_QUADRATURE_COUNT];
+struct ao_debounce {
+ uint8_t state;
+ uint8_t count;
+};
+
+static struct ao_debounce ao_debounce_state[AO_QUADRATURE_COUNT][2];
+
#define port(q) AO_QUADRATURE_ ## q ## _PORT
#define bita(q) AO_QUADRATURE_ ## q ## _A
#define bitb(q) AO_QUADRATURE_ ## q ## _B
#define pinb(q) AO_QUADRATURE_ ## q ## _B ## _PIN
#define isr(q) ao_quadrature_isr_ ## q
-static inline uint16_t
-ao_quadrature_read(struct stm_gpio *gpio, uint8_t pin_a, uint8_t pin_b) {
- uint16_t v = stm_gpio_get_all(gpio);
+#define DEBOUNCE 10
- return ~((((v >> pin_a) & 1) | (((v >> pin_b) & 1) << 1))) & 3;
+static uint8_t
+ao_debounce(uint8_t cur, struct ao_debounce *debounce)
+{
+ if (cur == debounce->state)
+ debounce->count = 0;
+ else {
+ if (++debounce->count == DEBOUNCE) {
+ debounce->state = cur;
+ debounce->count = 0;
+ }
+ }
+ return debounce->state;
}
-#define _ao_quadrature_get(q) ao_quadrature_read(port(q), bita(q), bitb(q))
+static uint16_t
+ao_quadrature_read(struct stm_gpio *gpio, uint8_t pin_a, uint8_t pin_b, struct ao_debounce debounce_state[2]) {
+ uint16_t v = ~stm_gpio_get_all(gpio);
+ uint8_t a = (v >> pin_a) & 1;
+ uint8_t b = (v >> pin_b) & 1;
+
+ a = ao_debounce(a, &debounce_state[0]);
+ b = ao_debounce(b, &debounce_state[1]);
+
+ return a | (b << 1);
+}
+
+#define _ao_quadrature_get(q) ao_quadrature_read(port(q), bita(q), bitb(q), ao_debounce_state[q])
static void
_ao_quadrature_queue(uint8_t q, int8_t step)
ao_wakeup(&ao_quadrature_count[q]);
}
-
static void
_ao_quadrature_set(uint8_t q, uint8_t new) {
uint8_t old = ao_quadrature_state[q];