Push minimum PWM value mgmt into rgb module

[rgblamp.git] / rgb.h

diff --git a/rgb.h b/rgb.h
index 05a061c823c3922cfa72bab0139164afc0ab27b0..7dc0da38f13e9742643bd88d5f1e6019900537e0 100644 (file)
--- a/rgb.h
+++ b/rgb.h
@@ -10,6 +10,12 @@
 
 #include "isr.h"
 
+/* Optional brightness compensation.  Pick zero or one */
+#define CEIL256
+#undef CEIL32
+
+#define MIN_PWM 4 /* PWM settings below this value do not illuminate the LED */
+
 /* Initialize the RGB LED assembly.  Outputs are zero, PWM is off. */
 void rgb_init();
 
@@ -20,13 +26,52 @@ void rgb_init();
 void rgb_off();
 
 /* Set a PWM value for each color LED.  0=off, 255=full on. */
+#ifdef CEIL256
+extern const unsigned char pwm_table[];
+#define rgb_set(red, grn, blu, wht) do { \
+    unsigned char tmp; \
+    ndi(); /* FIXME: doesn't seem to fix flicker */ \
+    tmp = pwm_table[(red)]; \
+    CCPR3L = (tmp < MIN_PWM) ? MIN_PWM : tmp; \
+    tmp = pwm_table[(grn)]; \
+    CCPR2L = (tmp < MIN_PWM) ? MIN_PWM : tmp; \
+    tmp = pwm_table[(blu)]; \
+    CCPR4L = (tmp < MIN_PWM) ? MIN_PWM : tmp; \
+    tmp = pwm_table[(wht)]; \
+    CCPR1L = (tmp < MIN_PWM) ? MIN_PWM : tmp; \
+    nei(); \
+} while (0)
+#else
+#ifdef CEIL32
+extern const unsigned char pwm_table[];
 #define rgb_set(red, grn, blu, wht) do { \
+    unsigned char tmp; \
     ndi(); /* FIXME: doesn't seem to fix flicker */ \
-    CCPR1L = (red); \
-    CCPR2L = (grn); \
-    CCPR3L = (blu); \
-    CCPR4L = (wht); \
+    tmp = pwm_table[(red)] >> 3; \
+    CCPR3L = (tmp < MIN_PWM) ? MIN_PWM : tmp; \
+    tmp = pwm_table[(grn)] >> 3; \
+    CCPR2L = (tmp < MIN_PWM) ? MIN_PWM : tmp; \
+    tmp = pwm_table[(blu)] >> 3; \
+    CCPR4L = (tmp < MIN_PWM) ? MIN_PWM : tmp; \
+    tmp = pwm_table[(wht)] >> 3; \
+    CCPR1L = (tmp < MIN_PWM) ? MIN_PWM : tmp; \
     nei(); \
 } while (0)
+#else
+#define rgb_set(red, grn, blu, wht) do { \
+    unsigned char tmp; \
+    ndi(); /* FIXME: doesn't seem to fix flicker */ \
+    tmp = (red); \
+    CCPR3L = (tmp < MIN_PWM) ? MIN_PWM : tmp; \
+    tmp = (grn); \
+    CCPR2L = (tmp < MIN_PWM) ? MIN_PWM : tmp; \
+    tmp = (blu); \
+    CCPR4L = (tmp < MIN_PWM) ? MIN_PWM : tmp; \
+    tmp = (wht); \
+    CCPR1L = (tmp < MIN_PWM) ? MIN_PWM : tmp; \
+    nei(); \
+} while (0)
+#endif
+#endif
 
 #endif