fix power settings; rand() for flapbird

2 files changed, 27 insertions, 4 deletions

diff --git a/source/flapbird.c b/source/flapbird.c
index f2dd2cf..800e892 100644
--- a/source/flapbird.c
+++ b/source/flapbird.c
@@ -1,5 +1,8 @@
 #include "buttons.h"
 #include "dogs.h"
+#include "hal.h"
+
+#include <stdint.h>
 
 static const unsigned char bird[] = {
     8, 8,
@@ -20,11 +23,23 @@ static int py;
 static int vy;
 static int counter;
 
+static uint32_t next = 31415926;
+
+int rand()
+{
+    uint32_t tr = RTC->TR;
+    uint32_t dr = RTC->DR;
+    next = next * (0x197244 + dr) + tr;
+    return (unsigned int)(next / 65536) % 32768;
+}
+
+#define NEW_BAR()	(rand() % 50 + 5)
+
 void flapbird_init()
 {
     score = 0;
-    t1x = DISP_WIDTH / 2, t1o = 15;
-    t2x = DISP_WIDTH, t2o = 49;
+    t1x = DISP_WIDTH / 2, t1o = NEW_BAR();
+    t2x = DISP_WIDTH, t2o = NEW_BAR();
     py = DISP_HEIGHT / 2 - 4;
     vy = 0;
     counter = 0;
@@ -69,11 +84,16 @@ int flapbird_loop()
         score = (py + 2 > t2o - 10 && py + 6 < t2o + 10) ? score + 1 : 0;
 
     t1x -= 2;
-    if (t1x <= -5)
+    if (t1x <= -5) {
         t1x = DISP_WIDTH;
+	t1o = NEW_BAR();
+    }
+
     t2x -= 2;
-    if (t2x <= -5)
+    if (t2x <= -5) {
         t2x = DISP_WIDTH;
+	t2o = NEW_BAR();
+    }
 
     return 100;
 }
diff --git a/source/main.c b/source/main.c
index fd753ea..89f3cf0 100644
--- a/source/main.c
+++ b/source/main.c
@@ -67,6 +67,9 @@ static void alarm_callback(RTCDriver *rtcp, rtcevent_t event)
 int main(void)
 {
     halInit();
+
+    RCC->CR &= ~(RCC_CR_PLLON); // Ensure that the PLL is off (unused).
+
     //chSysInit();
     buttons_init();