Merge branch 'master'

[fw/altos] / src / samd21 / ao_neopixel.c

diff --git a/src/samd21/ao_neopixel.c b/src/samd21/ao_neopixel.c
new file mode 100644 (file)
index 0000000..818910c
--- /dev/null
+++ b/src/samd21/ao_neopixel.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright © 2019 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, 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.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <ao.h>
+#include <ao_snek.h>
+
+void
+ao_snek_neopixel_write(void *gpio, uint8_t pin, int npixel, const struct snek_neopixel *pixels)
+{
+       volatile uint32_t *outtgl = &(((struct samd21_port *) gpio)->outtgl);
+       uint32_t value = ((uint32_t) 1 << pin);
+
+       while (npixel--) {
+               int32_t p = pixels->p;
+               uint8_t bit;
+               pixels++;
+
+               ao_arch_block_interrupts();
+               for (bit = 0; bit < 24; bit++) {
+                       *outtgl = value;
+                       ao_arch_nop();
+                       ao_arch_nop();
+                       ao_arch_nop();
+                       ao_arch_nop();
+                       ao_arch_nop();
+
+                       ao_arch_nop();
+                       ao_arch_nop();
+                       ao_arch_nop();
+                       if (p < 0) {
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+
+                               *outtgl = value;
+                       } else {
+                               *outtgl = value;
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+
+                               ao_arch_nop();
+                               ao_arch_nop();
+                               ao_arch_nop();
+
+                       }
+                       ao_arch_nop();
+                       ao_arch_nop();
+                       ao_arch_nop();
+                       ao_arch_nop();
+                       ao_arch_nop();
+
+                       ao_arch_nop();
+
+                       p <<= 1;
+               }
+               ao_arch_release_interrupts();
+       }
+}