3 files changed, 36 insertions, 2 deletions
diff --git a/include/byte_math.h b/include/byte_math.h
new file mode 100644
index 0000000..79f93b8
--- /dev/null
+++ b/include/byte_math.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+/* Library for doing fast math functions using just uint8_t. */
+
+extern uint8_t sintable[256];
+
+/* Returns ((sin(n) + 1) / 2) * 255 */
+static inline uint8_t byte_sin(uint8_t n)
+{
+  return sintable[n];
+}
+
+uint8_t calc_w(uint8_t n);
diff --git a/include/sysled.h b/include/sysled.h
new file mode 100644
index 0000000..b9556f1
--- /dev/null
+++ b/include/sysled.h
@@ -0,0 +1,19 @@
+#pragma once
+
+/* Easily turn on and off the system-led. */
+
+#include "ch573/gpio.h"
+
+static inline void enable_sysled()
+{
+  CH573_GPIO__GPIO_PORT_T_INTF.dir.set(ch573_gpio__gpio_port_a, DIR_OUT, 8);
+  CH573_GPIO__GPIO_PORT_T_INTF.pd_drv.set(ch573_gpio__gpio_port_a, 0, 8);
+}
+
+// If "on" then turn on the sysled (which counter-intuitively means turning off
+// the GPIO).
+static inline void set_sysled(int on)
+{
+//   CH573_GPIO__GPIO_PORT_T_INTF.out.set(
+//       ch573_gpio__gpio_port_a, on ? OFF : ON, 8);
+}
diff --git a/include/ws2812b.h b/include/ws2812b.h
index cb10979..e814b65 100644
--- a/include/ws2812b.h
+++ b/include/ws2812b.h
@@ -4,11 +4,11 @@
 #include <stdlib.h>
 
 #define WIRE_BYTES_PER_COLOR 9
-#define PADDING_BYTES 0
+#define PADDING_BYTES 1
 #define TOTAL_BYTES_PER_LED (PADDING_BYTES + WIRE_BYTES_PER_COLOR)
 
 enum ws2812b_byte_order {
-  BYTE_ORDER_BGR = 0,
+  BYTE_ORDER_RGB = 0,
   BYTE_ORDER_GBR = 1,
 };