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   1 /*
   2  * Copyright © 2019 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
  17  */
  18
  19 #include <ao.h>
  20 #include <ao_snek.h>
  21
  22 void
  23 ao_snek_neopixel_write(void *gpio, uint8_t pin, int npixel, const struct snek_neopixel *pixels)
  24 {
  25         volatile uint32_t *outtgl = &(((struct samd21_port *) gpio)->outtgl);
  26         uint32_t value = ((uint32_t) 1 << pin);
  27
  28         while (npixel--) {
  29                 int32_t p = pixels->p;
  30                 uint8_t bit;
  31                 pixels++;
  32
  33                 ao_arch_block_interrupts();
  34                 for (bit = 0; bit < 24; bit++) {
  35                         *outtgl = value;
  36                         ao_arch_nop();
  37                         ao_arch_nop();
  38                         ao_arch_nop();
  39                         ao_arch_nop();
  40                         ao_arch_nop();
  41
  42                         ao_arch_nop();
  43                         ao_arch_nop();
  44                         ao_arch_nop();
  45                         if (p < 0) {
  46                                 ao_arch_nop();
  47                                 ao_arch_nop();
  48                                 ao_arch_nop();
  49                                 ao_arch_nop();
  50                                 ao_arch_nop();
  51
  52                                 ao_arch_nop();
  53                                 ao_arch_nop();
  54                                 ao_arch_nop();
  55                                 ao_arch_nop();
  56                                 ao_arch_nop();
  57
  58                                 ao_arch_nop();
  59                                 ao_arch_nop();
  60                                 ao_arch_nop();
  61                                 ao_arch_nop();
  62                                 ao_arch_nop();
  63
  64                                 ao_arch_nop();
  65                                 ao_arch_nop();
  66                                 ao_arch_nop();
  67
  68                                 *outtgl = value;
  69                         } else {
  70                                 *outtgl = value;
  71                                 ao_arch_nop();
  72                                 ao_arch_nop();
  73                                 ao_arch_nop();
  74                                 ao_arch_nop();
  75                                 ao_arch_nop();
  76
  77                                 ao_arch_nop();
  78                                 ao_arch_nop();
  79                                 ao_arch_nop();
  80                                 ao_arch_nop();
  81                                 ao_arch_nop();
  82
  83                                 ao_arch_nop();
  84                                 ao_arch_nop();
  85                                 ao_arch_nop();
  86
  87                         }
  88                         ao_arch_nop();
  89                         ao_arch_nop();
  90                         ao_arch_nop();
  91                         ao_arch_nop();
  92                         ao_arch_nop();
  93
  94                         ao_arch_nop();
  95
  96                         p <<= 1;
  97                 }
  98                 ao_arch_release_interrupts();
  99         }
 100 }