Another random number generator update

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5406 42af7a65-404d-4744-a932-0658087f49c3

nuttx/drivers/lcd/ug-2864ambag01.c

@@ -970,7 +970,7 @@ static int ug2864ambag01_setcontrast(struct lcd_dev_s *dev, unsigned int contras
    */
 
 #if CONFIG_LCD_MAXCONTRAST != 255
-  newcontrast = ((contrast << 8) - 1) / CONFIG_LCD_MAXCONTRAST;
+  scaled = ((contrast << 8) - 1) / CONFIG_LCD_MAXCONTRAST;
 #else
   scaled = contrast;
 #endif

nuttx/libc/stdlib/lib_rand.c

@@ -175,13 +175,13 @@ static inline void fgenerate2(void)
   unsigned long randint;
 
   /* Second order congruential generator.  One may be added to the result of the
-   * generated value to avoid the value zero (I am not sure if this is necessor
+   * generated value to avoid the value zero (I am not sure if this is necessary
    * for higher order random number generators or how this may effect the quality
    * of the generated numbers).
    */
 
   randint    = (RND2_CONSTK1 * g_randint1 +
-                RND2_CONSTK2 * g_randint2) % RND2_CONSTP + 1;
+                RND2_CONSTK2 * g_randint2) % RND2_CONSTP;
 
   g_randint2 = g_randint1;
   g_randint1 = (randint == 0 ? 1 : randint);
@@ -208,14 +208,14 @@ static inline void fgenerate3(void)
   unsigned long randint;
 
   /* Third order congruential generator.  One may be added to the result of the
-   * generated value to avoid the value zero (I am not sure if this is necessor
+   * generated value to avoid the value zero (I am not sure if this is necessary
    * for higher order random number generators or how this may effect the quality
    * of the generated numbers).
    */
 
   randint    = (RND3_CONSTK1 * g_randint1 +
                 RND3_CONSTK2 * g_randint2 +
-                RND3_CONSTK2 * g_randint3) % RND3_CONSTP + 1;
+                RND3_CONSTK2 * g_randint3) % RND3_CONSTP;
 
   g_randint3 = g_randint2;
   g_randint2 = g_randint1;