Merge branch 'master'

[fw/altos] / src / samd21 / ao_apa102.c

diff --git a/src/samd21/ao_apa102.c b/src/samd21/ao_apa102.c
new file mode 100644 (file)
index 0000000..e391f96
--- /dev/null
+++ b/src/samd21/ao_apa102.c
@@ -0,0 +1,66 @@
+/*
+ * 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>
+
+#define bit(v) do {                            \
+               port_c->outtgl = (1 << pin_c);  \
+               ao_arch_nop(); \
+               ao_gpio_set(port_d, pin_d, v);  \
+               ao_arch_nop(); \
+               port_c->outtgl = (1 << pin_c);  \
+               ao_arch_nop(); \
+       } while (0)
+
+#define byte(v)        do {                            \
+               uint8_t _bit_ = 0x80;           \
+               while (_bit_) {                 \
+                       bit(!!((v) & _bit_));   \
+                       _bit_ >>= 1;            \
+               }                               \
+       } while(0)
+
+#define repeat(v,c) do {                       \
+               uint8_t _i_;                    \
+               for (_i_ = 0; _i_ < (c); _i_++) \
+                       bit(v);                 \
+       } while (0)
+
+void
+ao_snek_apa102_write(void *gpio_d, uint8_t pin_d,
+                    void *gpio_c, uint8_t pin_c,
+                    int npixel,
+                    struct snek_neopixel *pixels)
+{
+       struct samd21_port *port_d = gpio_d;
+       struct samd21_port *port_c = gpio_c;
+
+       ao_gpio_set(port_c, pin_c, 1);
+       int i;
+       for (i = 0; i < 32; i++)
+               ao_arch_nop();
+       repeat(0, 32);
+       while (npixel--) {
+               byte(0xff);
+               byte(pixels->b);
+               byte(pixels->g);
+               byte(pixels->r);
+       }
+       repeat(1, 32);
+}