Update Files

Kinc/Sources/kinc/libs/drivers/pwm/pwm.c

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+/*
+ * Generic GPIO led
+ *
+ * Copyright (C) 2019 - 2020 Andy Green <andy@warmcat.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+#include "private-lib-core.h"
+
+static const lws_led_intensity_t sineq16[] = {
+
+	/*
+	 * Quadrant at sin(270) in 16 samples, normalized so
+	 * -1 == 0 and 0 == 32767
+	 */
+
+	    0,   158,   630,  1411,  2494,  3869,  5522,  7437,
+	 9597, 11980, 14562, 17321, 20228, 23225, 26374, 29555,
+	32767 /* to interpolate against */
+};
+
+/*
+ * Elaborate the 90 degree phase table to 360 degrees and offset to +32768,
+ * notice for the last sample we have to interpolate against a 17th sample
+ * reflecting full scale to avoid clipping due to interpolation against the
+ * 16th sample again
+ */
+
+static lws_led_intensity_t
+sine_lu(int n, int next)
+{
+        switch ((n >> 4) & 3) {
+        case 1:
+        	/* forwards */
+                return 32768 + sineq16[(n & 15) + next];
+        case 2:
+        	/* scan it backwards */
+                return 32768 + sineq16[15 - (n & 15) + (!next)];
+        case 3:
+        	/* forwards */
+                return 32768 - sineq16[(n & 15) + next];
+        default:
+        	/* scan it backwards */
+                return 32768 - sineq16[15 - (n & 15) + (!next)];
+        }
+}
+
+/*
+ * The normalized phase resolution is 16-bit, however much table you decide to
+ * have needs interpolating or indexing in a reduced number of significant
+ * phase bits if it doesn't have the same phase resolution.
+ *
+ * In this sine table we have a 16 x 15-bit sample quadrant reflected 4 times
+ * to make 360 degrees, so 64 accurate sample points, with the rest of the
+ * intermediate phases generated by linear interpolation.  That probably would
+ * sound a bit funky, but for modulating light dynamically it's more than
+ * enough.
+ */
+
+lws_led_intensity_t
+lws_led_func_sine(lws_led_seq_phase_t n)
+{
+        /*
+         * 2: quadrant
+         * 4: table entry in quadrant
+         * 10: interp (LSB)
+         */
+
+        return (sine_lu(n >> 10, 0) * (0x3ff - (n & 0x3ff)) +
+        	sine_lu(n >> 10, 1) * (n & 0x3ff)) / 0x3ff;
+}
+
+lws_led_intensity_t
+lws_led_func_linear(lws_led_seq_phase_t n)
+{
+	return (lws_led_intensity_t)n;
+}
+
+
+static lws_led_intensity_t
+lws_led_func_static(lws_led_seq_phase_t n)
+{
+	return ((int)n * LWS_LED_MAX_INTENSITY) / 2;
+}
+
+const lws_led_sequence_def_t lws_pwmseq_static_off = {
+	.func			= lws_led_func_static,
+	.ledphase_offset	= 0,
+	.ledphase_total		= 0,
+	.ms			= 0
+};
+
+const lws_led_sequence_def_t lws_pwmseq_static_half = {
+	.func			= lws_led_func_static,
+	.ledphase_offset	= 1,
+	.ledphase_total		= 0,
+	.ms			= 0
+};
+
+const lws_led_sequence_def_t lws_pwmseq_static_on = {
+	.func			= lws_led_func_static,
+	.ledphase_offset	= 2,
+	.ledphase_total		= 0,
+	.ms			= 0
+};
+
+const lws_led_sequence_def_t lws_pwmseq_sine_up = {
+	.func			= lws_led_func_sine,
+	.ledphase_offset	= 0, /* already at 0 amp at 0 phase */
+	.ledphase_total		= LWS_LED_FUNC_PHASE / 2, /* 180 degree ./^ */
+	.ms			= 300
+};
+
+const lws_led_sequence_def_t lws_pwmseq_sine_down = {
+	.func			= lws_led_func_sine,
+	.ledphase_offset	= LWS_LED_FUNC_PHASE / 2, /* start at peak */
+	.ledphase_total		= LWS_LED_FUNC_PHASE / 2, /* 180 degree ./^ */
+	.ms			= 300
+};
+
+const lws_led_sequence_def_t lws_pwmseq_linear_wipe = {
+	.func			= lws_led_func_linear,
+	.ledphase_offset	= 0,
+	.ledphase_total		= LWS_LED_FUNC_PHASE - 1,
+	.ms			= 300
+};
+
+const lws_led_sequence_def_t lws_pwmseq_sine_endless_slow = {
+	.func			= lws_led_func_sine,
+	.ledphase_offset	= 0, /* already at 0 amp at 0 phase */
+	.ledphase_total		= LWS_SEQ_LEDPHASE_TOTAL_ENDLESS,
+	.ms			= 1500
+};
+
+const lws_led_sequence_def_t lws_pwmseq_sine_endless_fast = {
+	.func			= lws_led_func_sine,
+	.ledphase_offset	= 0, /* already at 0 amp at 0 phase */
+	.ledphase_total		= LWS_SEQ_LEDPHASE_TOTAL_ENDLESS,
+	.ms			= 750
+};