#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();
#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 */ \
- CCPR3L = pwm_table[(red)]; \
- CCPR2L = pwm_table[(grn)]; \
- CCPR4L = pwm_table[(blu)]; \
- CCPR1L = pwm_table[(wht)]; \
+ 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 */ \
- CCPR3L = pwm_table[(red) >> 3]; \
- CCPR2L = pwm_table[(grn) >> 3]; \
- CCPR4L = pwm_table[(blu) >> 3]; \
- CCPR1L = pwm_table[(wht) >> 3]; \
+ 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 */ \
- CCPR3L = (red); \
- CCPR2L = (grn); \
- CCPR4L = (blu); \
- CCPR1L = (wht); \
+ 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