#include "buttons.h"
#include "rgb.h"
-#define STEP_SIZE 32 /* ms */
-#if 0
-#define MIN_INCOLOR_STEPS 320
-#define MAX_INCOLOR_STEPS 57600
-#define MIN_FADE_STEPS 32
-#define MAX_FADE_STEPS 480
-#else
-#define MIN_INCOLOR_STEPS 32
-#define MAX_INCOLOR_STEPS 160
-#define MIN_FADE_STEPS 32
-#define MAX_FADE_STEPS 160
-#endif
-#define reset_steps() do { incolor_steps = 1; fade_steps = 0; } while (0)
+#define STEP_SIZE 32 /* ms */
+#define reset_steps() do { incolor_steps = 1; fade_steps = 0; } \
+ while (0)
#define rand_u8() (rand() & 0xff)
-#define rand_u16() ((rand() << 8) + (rand() & 0xff))
-#define rand_incolor_steps() (MIN_INCOLOR_STEPS + rand_u16() % \
- (MAX_INCOLOR_STEPS - MIN_INCOLOR_STEPS))
-#define rand_fade_steps() (MIN_FADE_STEPS + rand() % \
- (MAX_FADE_STEPS - MIN_FADE_STEPS))
+#define rand_u16() ((rand() << 8) + rand_u8())
+#define rand_incolor_steps(s) (min_incolor_steps[s & 3] + \
+ (rand() % range_incolor_steps[s & 3]))
+#define rand_fade_steps(s) (min_fade_steps[s & 3] + \
+ (rand() % range_fade_steps[s & 3]))
#define leds_set(r,g,b,w) rgb_set((r).value >> 7, \
- (g).value >> 7, \
- (b).value >> 7, 0)
-// (w).value >> 7)
+ (g).value >> 7, \
+ (b).value >> 7, \
+ (w).value >> 7)
typedef struct {
int value;
int increment;
- int remainder;
+ char remainder;
} led_t;
#define INIT_LED { 0, 0, 0 }
+/* The index of all step arrays is the speed variable */
+#if 1
+const static unsigned min_incolor_steps[4] = { 320, 32, 32, 1 };
+const static unsigned range_incolor_steps[4] = { 32768, 128, 32, 8 };
+const static int min_fade_steps[4] = { 64, 32, 32, 1 };
+const static int range_fade_steps[4] = { 416, 128, 32, 8 };
+#else /* for debugging */
+const static unsigned min_incolor_steps[4] = { 64, 32, 16, 8 };
+const static unsigned range_incolor_steps[4] = { 1, 1, 1, 1 };
+const static int min_fade_steps[4] = { 64, 32, 16, 8 };
+const static int range_fade_steps[4] = { 1, 1, 1, 1 };
+#endif
+
int main(void)
{
led_t red = INIT_LED;
led_t grn = INIT_LED;
led_t blu = INIT_LED;
led_t wht = INIT_LED;
- unsigned char fast = 0;
+ unsigned char speed = 0;
unsigned incolor_steps;
int fade_steps;
unsigned char buttons = buttons_read();
if ((buttons & (IN_ROCKERA | IN_ROCKERB))) {
- if (buttons & IN_PUSHBTN) {
- if (!fast) {
- fast = 1;
+ /* Crappy way to detect rising edges to change state of speed var */
+ if (!(speed & 4) && (buttons & IN_PUSHBTN)) {
+ speed |= 4;
+ } else if ((speed & 4) && !(buttons & IN_PUSHBTN)) {
+ speed = (speed + 1) & ~4;
reset_steps();
- } else
- fast = 0;
}
if (fade_steps) {
} else if (--incolor_steps == 0) {
int newr, newg, newb, neww, tmp;
- /* Next led color. All off is not a valid option. */
+ /* Next led color. All off is not a valid option.
+ * RGB values are stored and processed as 15-bit non-negative
+ * integers. Since the RGB pwm values are 8 bits in width,
+ * leds_set() uses >> 7 to convert each color's value.
+ */
do {
- /* RGB values are processed 15-bit values. This allows for
- * signedness when fading to a lesser value. The actual PWM
- * values are set from the most significant 8 bits, so
- * leds_set() does >> 7.
- */
newr = rand();
newg = rand();
newb = rand();
} while (newr == 0 && newg == 0 && newb == 0 && neww == 0);
/* Next incolor and fade steps */
- incolor_steps = rand_incolor_steps();
- fade_steps = (buttons & IN_ROCKERA) ? 1 : rand_fade_steps();
- if (fast) {
- incolor_steps = 1 + incolor_steps / 8;
- if (buttons & IN_ROCKERB)
- fade_steps = 1 + fade_steps / 8;
- }
+ incolor_steps = rand_incolor_steps(speed);
+ fade_steps = (buttons & IN_ROCKERA) ? 1 : rand_fade_steps(speed);
/* Compute increment and remainder for each led */
red.increment = (newr - red.value) / fade_steps;