altos: Add fast-timer API. Use for quadrature and button drivers

[fw/altos] / src / stm / ao_debounce.c

diff --git a/src/stm/ao_debounce.c b/src/stm/ao_debounce.c
deleted file mode 100644 (file)
index 22cdf23..0000000
--- a/src/stm/ao_debounce.c
+++ /dev/null
@@ -1,187 +0,0 @@
-/*
- * Copyright © 2013 Keith Packard <keithp@keithp.com>
- *
- * 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.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
- */
-
-#include <ao.h>
-#include <ao_debounce.h>
-
-static uint8_t                 ao_debounce_initialized;
-static uint8_t                 ao_debounce_running;
-static struct ao_debounce      *ao_debounce;
-
-static void
-ao_debounce_on(void)
-{
-       stm_tim6.cr1 = ((0 << STM_TIM67_CR1_ARPE) |
-                       (0 << STM_TIM67_CR1_OPM) |
-                       (1 << STM_TIM67_CR1_URS) |
-                       (0 << STM_TIM67_CR1_UDIS) |
-                       (1 << STM_TIM67_CR1_CEN));
-}
-
-static void
-ao_debounce_off(void)
-{
-       stm_tim6.cr1 = ((0 << STM_TIM67_CR1_ARPE) |
-                       (0 << STM_TIM67_CR1_OPM) |
-                       (1 << STM_TIM67_CR1_URS) |
-                       (0 << STM_TIM67_CR1_UDIS) |
-                       (0 << STM_TIM67_CR1_CEN));
-}
-
-static void
-_ao_debounce_set(struct ao_debounce *debounce, uint8_t value)
-{
-       if (value != debounce->value) {
-               debounce->value = value;
-               debounce->_set(debounce, value);
-       }
-       _ao_debounce_stop(debounce);
-}
-
-/*
- * Get the current value, set the result when we've
- * reached the debounce count limit
- */
-static void
-_ao_debounce_check(struct ao_debounce *debounce)
-{
-       if (debounce->_get(debounce)) {
-               if (debounce->count < 0)
-                       debounce->count = 0;
-               if (debounce->count < debounce->hold) {
-                       if (++debounce->count == debounce->hold)
-                               _ao_debounce_set(debounce, 1);
-               }
-       } else {
-               if (debounce->count > 0)
-                       debounce->count = 0;
-               if (debounce->count > -debounce->hold) {
-                       if (--debounce->count == -debounce->hold)
-                               _ao_debounce_set(debounce, 0);
-               }
-       }
-}
-
-/*
- * Start monitoring one pin
- */
-void
-_ao_debounce_start(struct ao_debounce *debounce)
-{
-       if (debounce->running)
-               return;
-       debounce->running = 1;
-
-       /* Reset the counter */
-       debounce->count = 0;
-
-       /* Link into list */
-       debounce->next = ao_debounce;
-       ao_debounce = debounce;
-
-       /* Make sure the timer is running */
-       if (!ao_debounce_running++)
-               ao_debounce_on();
-
-       /* And go check the current value */
-       _ao_debounce_check(debounce);
-}
-
-/*
- * Stop monitoring one pin
- */
-void
-_ao_debounce_stop(struct ao_debounce *debounce)
-{
-       struct ao_debounce **prev;
-       if (!debounce->running)
-               return;
-
-       debounce->running = 0;
-
-       /* Unlink */
-       for (prev = &ao_debounce; (*prev); prev = &((*prev)->next)) {
-               if (*prev == debounce) {
-                       *prev = debounce->next;
-                       break;
-               }
-       }
-       debounce->next = NULL;
-
-       /* Turn off the timer if possible */
-       if (!--ao_debounce_running)
-               ao_debounce_off();
-}
-
-void stm_tim6_isr(void)
-{
-       struct ao_debounce      *debounce, *next;
-       if (stm_tim6.sr & (1 << STM_TIM67_SR_UIF)) {
-               stm_tim6.sr = 0;
-
-               /* Walk the current list, allowing the current
-                * object to be removed from the list
-                */
-               for (debounce = ao_debounce; debounce; debounce = next) {
-                       next = debounce->next;
-                       _ao_debounce_check(debounce);
-               }
-       }
-}
-
-/*
- * According to the STM clock-configuration, timers run
- * twice as fast as the APB1 clock *if* the APB1 prescaler
- * is greater than 1.
- */
-
-#if AO_APB1_PRESCALER > 1
-#define TIMER_23467_SCALER 2
-#else
-#define TIMER_23467_SCALER 1
-#endif
-
-#define TIMER_100kHz   ((AO_PCLK1 * TIMER_23467_SCALER) / 100000)
-
-void
-ao_debounce_init(void)
-{
-       if (ao_debounce_initialized)
-               return;
-       ao_debounce_initialized = 1;
-
-       stm_nvic_set_enable(STM_ISR_TIM6_POS);
-       stm_nvic_set_priority(STM_ISR_TIM6_POS, AO_STM_NVIC_CLOCK_PRIORITY);
-
-       /* Turn on timer 6 */
-       stm_rcc.apb1enr |= (1 << STM_RCC_APB1ENR_TIM6EN);
-
-       stm_tim6.psc = TIMER_100kHz;
-       stm_tim6.arr = 9;
-       stm_tim6.cnt = 0;
-
-       /* Enable update interrupt */
-       stm_tim6.dier = (1 << STM_TIM67_DIER_UIE);
-
-       /* Poke timer to reload values */
-       stm_tim6.egr |= (1 << STM_TIM67_EGR_UG);
-
-       stm_tim6.cr2 = (STM_TIM67_CR2_MMS_RESET << STM_TIM67_CR2_MMS);
-
-       /* And turn it off (for now) */
-       ao_debounce_off();
-}