WS2812 module (aka neopixel)

If I forgot anything or something is not solved sufficiently elegant, please let me know, I'll try to address this. This is just what I was able to construct in a few spare ours.

epicardium/modules/gpio.c

@@ -2,12 +2,13 @@
 #include "gpio.h"
 #include "max32665.h"
 #include "mxc_errors.h"
+#include "modules/gpio_common.h"
 
 /*
  * Despite what the schematic (currently, 2019-08-18) says these are the correct
  * pins for wristband GPIO 1-4 (not 0-3 as the schematic states)
  */
-static gpio_cfg_t gpio_configs[] = {
+gpio_cfg_t gpio_configs[] = {
 	[EPIC_GPIO_WRISTBAND_1] = { PORT_0,
 				    PIN_21,
 				    GPIO_FUNC_OUT,