Keisuke Sehara / Mbed 2 deprecated STM32_Whisking

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Dependencies:   mbed

Diff: random.cpp

Revision:
2:0c241937eabd
Parent:
0:f736749c33d2
Child:
13:8ea85a33e37a
--- a/random.cpp	Mon May 14 17:37:26 2018 +0000
+++ b/random.cpp	Mon May 14 18:07:57 2018 +0000
@@ -5,12 +5,25 @@
 namespace random
 {       
     AnalogIn noise(RANDOM_NOISE_PIN);
+    bool initialized = false;
     
     void init() {
         srand(noise.read_u16());
+        initialized = true;
+    }
+    
+    uint16_t unif(const uint16_t& nlevels) {
+        if (!initialized) {
+            init();
+        }
+        return ((uint16_t)rand()) % nlevels;
     }
     
     uint16_t exponential(const uint16_t& tau_ms, const uint16_t& cutoff, const unsigned int& resolution){
+        if (!initialized) {
+            init();
+        }
+        
         double ftau     = (double)tau_ms;
         double fcutoff  = (double)cutoff;
         double cumulativeFraction = ((double)(rand() & resolution))/resolution;