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Diffstat (limited to 'digital/io-hub/src/common/pwm.host.c')
-rw-r--r--digital/io-hub/src/common/pwm.host.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/digital/io-hub/src/common/pwm.host.c b/digital/io-hub/src/common/pwm.host.c
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+/* pwm.host.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 "modules/host/host.h"
+#include "modules/host/mex.h"
+
+/** PWM context. */
+struct pwm_t
+{
+ /** Current value. */
+ int16_t value;
+ /** 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) \
+ { 0, 0, 0 },
+struct pwm_t pwm[] = {
+ AC_IOHUB_PWM
+};
+#undef PWM
+
+/** Message type. */
+uint8_t pwm_mtype;
+
+/** Message has to be sent. */
+uint8_t pwm_changed;
+
+void
+pwm_init (void)
+{
+ const char *mex_instance = host_get_instance ("io-hub0", 0);
+ pwm_mtype = mex_node_reservef ("%s:pwm", mex_instance);
+}
+
+void
+pwm_update (void)
+{
+ uint8_t i;
+ /* Update timed PWM. */
+ 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);
+ }
+ }
+ /* Send change if needed. */
+ if (pwm_changed)
+ {
+ mex_msg_t *m = mex_msg_new (pwm_mtype);
+ for (i = 0; i < UTILS_COUNT (pwm); i++)
+ mex_msg_push (m, "h", pwm[i].value);
+ mex_node_send (m);
+ pwm_changed = 0;
+ }
+}
+
+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;
+ pwm[index].value = value;
+ pwm_changed = 1;
+}
+
+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;
+}
+