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-rw-r--r--digital/io-hub/src/common/pwm.avr.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/digital/io-hub/src/common/pwm.avr.c b/digital/io-hub/src/common/pwm.avr.c
new file mode 100644
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+++ b/digital/io-hub/src/common/pwm.avr.c
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+/* pwm.avr.c */
+/* io-hub - Modular Input/Output. {{{
+ *
+ * Copyright (C) 2011 Nicolas Schodet
+ *
+ * APBTeam:
+ * Web: http://apbteam.org/
+ * Email: team AT apbteam DOT org
+ *
+ * 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; 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
+ * 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 "common.h"
+#include "pwm.h"
+
+#include "modules/utils/utils.h"
+#include "preproc.h"
+
+/** PWM context. */
+struct pwm_t
+{
+ /** Output compare register. */
+ volatile uint16_t *ocr;
+ /** Direction port. */
+ volatile uint8_t *dir_port;
+ /** Direction bit value. */
+ uint8_t dir_bv;
+ /** Remaining time before timer elapse, 0 for disabled. */
+ uint16_t time;
+ /** Value to be used after timer elapse. */
+ int16_t value_rest;
+};
+
+/** Array of PWM contexts. */
+#define PWM(timer, pwm, pwm_io_port, pwm_io_n, dir_io_port, dir_io_n) \
+{ &PREPROC_PASTE (OCR, timer, pwm), \
+ &IO_PORT_ (dir_io_port, dir_io_n), IO_BV_ (dir_io_port, dir_io_n), \
+ 0, 0 },
+struct pwm_t pwm[] = {
+ AC_IOHUB_PWM
+};
+#undef PWM
+
+void
+pwm_init (void)
+{
+ /* Fast PWM, TOP = 0x3ff, with positive logic.
+ f_IO without prescaler.
+ Fpwm = f_IO / (prescaler * (1 + TOP)). */
+ uint8_t timer_com_1 = 0, timer_com_3 = 0;
+#define PWM(timer, pwm, pwm_io_port, pwm_io_n, dir_io_port, dir_io_n) \
+ do { \
+ PREPROC_PASTE (timer_com_, timer) |= \
+ _BV (PREPROC_PASTE (COM, timer, pwm, 1)); \
+ IO_DDR_ (pwm_io_port, pwm_io_n) |= IO_BV_ (pwm_io_port, pwm_io_n); \
+ IO_DDR_ (dir_io_port, dir_io_n) |= IO_BV_ (dir_io_port, dir_io_n); \
+ } while (0);
+ AC_IOHUB_PWM
+#undef PWM
+ if (timer_com_1)
+ {
+ TCCR1A = timer_com_1 |
+ regv (COM1A1, COM1A0, COM1B1, COM1B0, COM1C1, COM1C0, WGM11, WGM10,
+ 0, 0, 0, 0, 0, 0, 1, 1);
+ TCCR1B = regv (ICNC1, ICES1, 5, WGM13, WGM12, CS12, CS11, CS10,
+ 0, 0, 0, 0, 1, 0, 0, 1);
+ }
+ if (timer_com_3)
+ {
+ TCCR3A = timer_com_3 |
+ regv (COM3A1, COM3A0, COM3B1, COM3B0, COM3C1, COM3C0, WGM31, WGM30,
+ 0, 0, 0, 0, 0, 0, 1, 1);
+ TCCR3B = regv (ICNC3, ICES3, 5, WGM33, WGM32, CS32, CS31, CS30,
+ 0, 0, 0, 0, 1, 0, 0, 1);
+ }
+}
+
+void
+pwm_update (void)
+{
+ uint8_t i;
+ for (i = 0; i < UTILS_COUNT (pwm); i++)
+ {
+ if (pwm[i].time)
+ {
+ pwm[i].time--;
+ if (pwm[i].time == 0)
+ pwm_set (i, pwm[i].value_rest);
+ }
+ }
+}
+
+void
+pwm_set (uint8_t index, int16_t value)
+{
+ assert (index < UTILS_COUNT (pwm));
+ assert (value <= PWM_MAX && value >= -PWM_MAX);
+ pwm[index].time = 0;
+ if (value >= 0)
+ {
+ *pwm[index].dir_port &= ~pwm[index].dir_bv;
+ *pwm[index].ocr = value;
+ }
+ else
+ {
+ *pwm[index].dir_port |= pwm[index].dir_bv;
+ *pwm[index].ocr = -value;
+ }
+}
+
+void
+pwm_set_timed (uint8_t index, int16_t value, uint16_t time, int16_t value_rest)
+{
+ assert (index < UTILS_COUNT (pwm));
+ assert (value <= PWM_MAX && value >= -PWM_MAX);
+ assert (value_rest <= PWM_MAX && value_rest >= -PWM_MAX);
+ pwm_set (index, value);
+ pwm[index].time = time;
+ pwm[index].value_rest = value_rest;
+}
+