Revision 1:4115ae4cbc76, committed 2011-01-20

Comitter:

simon

Date:

Thu Jan 20 14:15:24 2011 +0000

Parent:

0:c795e64e9eb0

Commit message:

A program displaying strange memory behavior

Changed in this revision

--- a/main.cpp	Tue Dec 01 11:01:48 2009 +0000
+++ b/main.cpp	Thu Jan 20 14:15:24 2011 +0000
@@ -1,34 +1,44 @@
-// Testing PWM channel 0 vs channel 1 behaviour, sford
-
 #include "mbed.h"
 
-PwmOut pwm1(p26);
-PwmOut pwm2(p25);
+/*
+
+based on http://mbed.org/forum/mbed/topic/1704/
+
+the Pwm part doesnt work; only led1 comes on
+
+if the printf in the while is removed, or the PwmOut is moved to be static/global, all works fine
+
+seems like a memory problem.
+*/
 
 int main() {
-
-    uint32_t t = 10000;
+    DigitalOut led1(LED1);
+    float f=0.0;
 
-    // set period
-    LPC_PWM1->MR0 = t;
-    LPC_PWM1->LER |= 1 << 0;
+    PwmOut display(LED2);
 
-    while (1) {
+    display.period_ms(1);
 
-        // set pulsewidth to 100%
-        LPC_PWM1->MR1 = t;
-        LPC_PWM1->MR2 = t;
-        LPC_PWM1->LER |= 0x6;
-
-        // wait for update
-        while (LPC_PWM1->LER);
-
-        // set pulsewidth less than 100%
-        LPC_PWM1->MR1 = t - 500;
-        LPC_PWM1->MR2 = t - 500;
-        LPC_PWM1->LER |= 0x6;
-
-        // wait for update
-        while (LPC_PWM1->LER);
+    display=f;
+    
+    AnalogIn light(p20);
+   
+    for (int i=0;i<100;i++)
+    {
+        f=f+0.01;
+        display=f;
+        wait (0.03);
+    }
+    printf("%f\n",display.read());
+    led1=1;
+        
+    while (true)
+    {
+        double d=light;
+        double sq=pow(d,0.6);
+        display.write(sq*3);
+        
+        printf("%f / %f\n",d,sq);
+        wait(1);
     }
 }

--- a/mbed.bld	Tue Dec 01 11:01:48 2009 +0000
+++ b/mbed.bld	Thu Jan 20 14:15:24 2011 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/32af5db564d4
+http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e