Add README

[rgblamp.git] / adc_random.c

diff --git a/adc_random.c b/adc_random.c
index d516d7fbc74b6802b1d4fe4a6f55aa3013c2ec27..abdcb2106485d7a2ac73910fb269758c7263e658 100644 (file)
--- a/adc_random.c
+++ b/adc_random.c
@@ -1,3 +1,32 @@
+/*
+ * Copyright © 2011, 2012, Titanium Mirror, Inc..
+ * All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - Neither the name of Titanium Mirror, Inc. nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
 /*
  * File:   adc_random.c
  *
@@ -6,29 +35,29 @@
  */
 
 #include <htc.h>
-#include "timer.h"
+#include "tmr.h"
 
 unsigned char adc_random()
 {
-    static bit save_ansa2;
-    static bit save_trisa2;
+    static bit save_ansa0;
+    static bit save_trisa0;
     unsigned char accumulate = 0;
 
     /* Turn on the FVR, configured for 1.024V to the ADC */
     FVRCON = 0b10000001;
     while (!FVRRDY); /* wait for ready signal */
 
-    /* Configure RA2 (AN2) for ADC input */
-    save_ansa2 = ANSA2;
-    ANSA2 = 1;
-    save_trisa2 = TRISA2;
-    TRISA2 = 1;
+    /* Configure RA0 (AN0) for ADC input */
+    save_ansa0 = ANSA0;
+    ANSA0 = 1;
+    save_trisa0 = TRISA0;
+    TRISA0 = 1;
     ADCON1 = 0b11110011; /* Right justified result, Frc clk, FVR/Vss refs */
-    ADCON0 = 0b00001001; /* Enable channel AN2, enable ADC */
+    ADCON0 = 0b00000001; /* Enable channel AN0, enable ADC */
 
     /* Sample the ADC several times, accumulating the LSB of the result */
     for (unsigned i = 0; i < 128; i++) {
-        timer_uwait(10); /* Sampling time */
+        tmr_uwait(10); /* Sampling time */
         ADGO = 1; /* Start the conversion */
         while (ADGO); /* wait for completion */
         accumulate += ADRESL;
@@ -37,8 +66,8 @@ unsigned char adc_random()
     /* Turn off ADC, FVR, and revert PORTA changes */
     ADON = 0;
     FVREN = 0;
-    TRISA2 = save_trisa2;
-    ANSA2 = save_ansa2;
+    TRISA0 = save_trisa0;
+    ANSA0 = save_ansa0;
 
     /* Return the result */
     return accumulate;